Guidance for Safe Systems of Work · 2019. 10. 4. · with LOLER and restraining chains in accordance with BS EN . 14653:2005 Manually Operated Shoring Systems for Groundwork Support

SHORING ANCILLARIES

Guidance for Safe Systems of Work

EXCAVATION SAFETYTRENCH SHEET / SHEET PILES

HYDRAULIC SYSTEMSCHAINS

mgf.ltd.uk

MGF SHORING ANCILLARIES GUIDANCE FOR SAFESYSTEMS OF WORK (SSoW)GENERAL Current health and safety legislation requires that construction equipment users formulate a site specific Safe System of Work to undertake the works they are proposing. This document is intended to provide sufficient product specific guidance on handling, installing, maintaining and removing MGF equipment to allow the SSoW to be compiled. It should always be read in conjunction with the product specific technical files and the site specific design information (including any residual risks to be managed on site) provided by MGF or others.

Users of this equipment should be both familiar with and competent in its use. MGF can provide toolbox talks and training material / advice on request.

These products are designed to comply with current best practice and meet the requirements of the Lifting Operations & Lifting Equipment Regulations (LOLER), Provision and Use of Work Equipment Regulation (PUWER), Work at Height Regulations and the Confined Spaces Regulations as appropriate.

For the latest controlled copies of this document, MGF contact details or further information visit mgf.ltd.uk

CONTENTSINTRODUCTION

SECTION 1: MGF CHAINS 1.1 Lifting Chains1.2 Restraining Chains1.3 Extraction Chains

SECTION 2: MGF TRENCH SHEET / SHEET PILE ANCILLARIES 2.1 Pitching Shackles2.2 Extractors2.3 Driving Caps

SECTION 3: MGF HYDRAULIC SYSTEMS ANCILLARIES 3.1 Single Acting and Double Acting Bucket Pumps3.2 Double Acting Motorised Pump Unit3.3 Shoring Fluid

SECTION 4: MGF SHORING SAFETY SYSTEMS 4.1 Edgesafe4.2 Endsafe Panels and Struts4.3 Laddersafe4.4 Stairsafe4.5 Davitsafe

GENERAL SAFETY NOTES • MGF ancillaries MUST ONLY be used in conjunction with MGF products and

solely for the purposes shown.• ALWAYS ensure that MGF ancillaries are supplied with green inspection tags

and / or valid LOLER test certificates (where appropriate).• Prior to use ALWAYS inspect equipment (especially lifting points) for evidence of

damage, ensure that all components are present and in good working order, and familiarise yourself with its operation.

• ENSURE that operatives using the equipment always work from a position of safety avoiding working above an unsupported edge or under a suspended load.

• NEVER attempt to lift equipment over personnel and always risk assess the consequences of a lifted load being dropped.

REMEMBER - IF IN DOUBT ASK!

MGF Chains

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MGF CHAINSINTRODUCTION MGF chains are supplied solely for use with MGF equipment. MGF lifting chains and extraction chains are supplied with a valid test certificate in accordance with LOLER and all MGF chains are manufactured from certified (min. grade 8) components. Extraction chains should only be used to release / raise equipment from within an excavation and should not be used for general lifting. MGF restraining chains are provided with a load capacity based upon the SWL of the chain and components when manufactured. All MGF restraining chains and components are graded components but differ from lifting chains as they are not certified under LOLER for lifting operations. They are used to aid the installation of individual shoring components within an excavation. They must never be solely relied upon to support equipment above operatives or used for lifting.

Current health and safety legislation requires that construction equipment users always formulate a site specific Safe System of Work (SSoW) to undertake the works they are proposing. These documents are intended to provide sufficient product specific guidance on the use of MGF ancillaries to allow the SSoW to be compiled. They should always be read in conjunction with the product specific technical files and any site specific design information provided by MGF or others.

MGF lifting and extraction chains are supplied in accordance with LOLER and restraining chains in accordance with BS EN 14653:2005 Manually Operated Shoring Systems for Groundwork Support and BS EN 13331:2002 Trench Lining Systems.

LIFTING CHAINS: SAFETY NOTES • Ensure valid LOLER test certification (minimum 6 monthly

thorough examination) available on site and that a lifting plan is in place including a site specific risk assessment.

• Inspect chains for any evidence of damage prior to every use (in particular check for chain stretch, hook deformation or missing components). Never force, strike or wedge any components.

• Ensure chain capacity matches that required for the proposed lifts and that the chain is suitable for the lift planned in terms of chain lengths, number of legs or types of components such as hooks and shackles.

• Ensure no chain is used to lift at an angle to the vertical greater than 60 degrees and that no lifting chain is used to move / lift equipment in excess of the stated SWL.

• Only attach hooks / shackles to serviceable designated lifting / handling points and ensure any hooks are facing outward from the load and the bowl of the hook is fully engaged around the lifting points prior to lifting. Shackle pins must be fully threaded.

• If twisting of the load is possible ensure that the master links and chains are not twisted and preferably provide a swivel hook. Never allow any of the components to snag on attachments points, or other objects / edges and ensure they are free to rotate / extend.

• Ensure loads when lifted are balanced and fit tag lines on awkward loads. Always carry out a trial lift and lower. Keep hands well clear when tensioning chains.

• When not using all the legs of a multi link chain the SWL of the chain set reduces. Always ensure that the unused legs are connected to the master link to avoid snagging.

MAX 60˚

45˚60˚

Standard Duty 4-Leg Chain 6.7 FLC----- 2.5 32

Standard Duty 2-Leg Chain 6.3 TLC----- 2.5 21

Single Leg Swivel Chain 5.3 SLC----- 0.8 11Heavy Duty 2-Leg Chain 10 TLC----- 5.0 39

Long Leg Standard Duty 4-Leg Chain 6.7 FLC----- 5.0 60

Product Description SWL (Te) Product ID* Length (m) Weight (kg)

* Under LOLER each lifting chain is uniquely identified

Standard Duty4-Leg Chain

Long Leg StandardDuty 4-Leg Chain

Standard Duty2-Leg Chain

Heavy Duty 2-Leg Chain Single Leg Swivel Chain

The Long leg Standard Duty 4-Leg Chain and the Heavy Duty 2-Leg Chain include shortening clutches that allow the chain assemblies to be quickly and easily shortened as required. The required length of chain is selected and the top link is secured within the shortening clutch.

MGF CHAINS

SHORING ANCILLARIES SECTION 1

• Do not twist or knot chains.• Do not unevenly load the legs of multi-leg chains. In particular take care that loads

cannot snag when being lifted out of the ground.• Do not shake or snatch loads using lifting chains.• Chains are very heavy.• Never lift over personnel and prior to lifting ensure that any personnel potentially

within the fall radius of the lift stand well clear and are turned to observe the operation.

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RESTRAINING CHAINS: SAFETY NOTES • MGF restraining chains are designed to provide short term vertical support (via trench

sheets or sheet piles) to waler and brace systems to assist installation / removal and in the event of a system failure.

• Always provide the minimum number of chains as specified by the design - generally minimum of two chains per leg.

• Inspect chain for any evidence of damage prior to every use. In particular check for chain stretch, hook deformation or missing components.

• Always attach to designated restraining points using the shackles provided, shortening the individual chains by looping the shackle through the appropriate link to ensure that the chains are evenly loaded.

• Two types are provided hook to shackle and shackle to shackle. The hook to shackle type are used to suspend the highest frame off the trench sheets / sheet piles whilst the shackle to shackle provide support between frame levels.

• Never use restraining chains for lifting.• Always ensure that the maximum angle the chain

hangs at is no greater than 30 degrees from the vertical in any plane.

Individual chain links should be selected to ensure all restraining chains are evenly loaded.

The lower frames use a shackle to shackle restraining chain. Shackles are connected to the bottom lift point of the top frame and the top lift point of the bottom frame.

The top frame uses a hook to shackle restraining chain. The safety hook fits over the sheet and the shackle connects to the frame lifting point.

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MGF CHAINS


Product DescriptionLoad

Capacity (Te) Product ID Length (m)

Standard Duty Restraining Chain (hook) 2 2.704 2.5 9

Weight (kg)

Standard Duty Restraining Chain (shackles) 2 2.705 2.5 9

Heavy Duty Restraining Chain (hook) 3.15 2.708 / 2.710 /

2.7122.5, 5.0

& 7.0 14 / 25 / 34

Heavy Duty Restraining Chain (shackles) 3.15 2.706 / 2.707 /

2.709 / 2.7110.5, 2.5,5.0 & 7.0

4 / 14 /25 / 34

Standard Duty 2Te Restraining Chain(Hook to Shackle)

Standard Duty 2Te Restraining Chain(Shackle to Shackle)

Heavy Duty 3.15Te Restraining Chain(Hook to Shackle)

Heavy Duty 3.15Te Restraining Chain(Shackle to Shackle)

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EXTRACTION CHAINS: SAFETY NOTES • Ensure valid LOLER test certification (minimum 6 monthly thorough examination)

available on site and that a lifting plan is in place including a site specific risk assessment.

• MGF extraction chains are used to raise or release MGF equipment within the confines of an excavation as part of the overall extraction operation.

• Particularly suitable for raising and releasing boxes during backfilling / extraction operations or for releasing sheets / shoring equipment stuck in the ground or situations where heavy / unpredictable loads are anticipated

• Only attach to servicable designated extraction points on the equipment.• Use slow vertical movements to avoid shock loading.• Not to be used for general lifting.• Extraction loads of up to 50Te can be generated in extreme situations when releasing

stuck MGF Box Systems.• Always inspect extraction chains before and after use for evidence of damage

(especially stretched chain links).

Product Description

Standard DutyExtraction ChainHeavy DutyExtraction Chain

Load Capacity (Te)

12.5

19

Product ID*

SLC-----

SLC-----

Length (m)

0.8

0.8

26

Weight (kg)

30

* Under LOLER each extraction chain is uniquely identified

Standard Duty Extraction Chain Heavy Duty Extraction Chain

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MGF Sheets & Walers Installation

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MGF TRENCH SHEET / SHEET PILE ANCILLARIESINTRODUCTION MGF Trench Sheet / Sheet Pile ancillaries are designed and manufactured exclusively by MGF for use with MGF products.

The ancillaries are designed specifically to assist with the handling, pitching, driving and extracting of MGF trench sheets or sheet piles.

They are manufactured from minimum Grade S275 structural steel and comply with the requirements of LOLER and PUWER as appropriate.

Current health and safety legislation requires that construction equipment users formulate a site specific Safe System of Work (SSoW) to undertake the works they are proposing. This document is intended to provide sufficient product specific guidance on handling, installing, maintaining and removing MGF equipment to allow the SSoW to be compiled. It should always be read in conjunction with the product specific technical files and the site specific design information (including any residual risks to be managed on site) provided by MGF or others.

Users of this equipment should be both familiar with and competent in its use. MGF can provide toolbox talks and training material / advice on request.

These products are designed to comply with current best practice and meet the requirements of the Lifting Operations & Lifting Equipment Regulations (LOLER), Provision and Use of Work Equipment Regulation (PUWER), Work at Height Regulations and the Confined Spaces Regulations as appropriate.

For MGF contact details or further information visit www.mgf.ltd.uk

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PITCHING SHACKLES: SAFETY NOTES • MGF pitching shackles are designed to lift MGF trench sheets and sheet piles (via

pins slotted through handling holes) from a flat stack into a vertical orientation prior to lifting / lowering into an excavation ready for driving. They are also designed to lift the sheets vertically out of the excavation (and re-stack flat) during the backfilling / extraction process. They must never be used to forcibly release sheets from the ground or to shake / tap / drag the sheets.

• MGF pitching shackles have failsafe spring loaded locking pin mechanisms which ensure the pin is fully locked unless the mechanism is manually activated by pulling a soft rope attached to the lever arm vertically downwards by approximately 150mm to disengage the pin. The main advantage of this system is that the sheet can be safely released from ground levels by attaching a suitable length of soft rope to the lever arm.

• All MGF pitching shackles are fitted with graded D shackles for attachment to appropriate lifting chains and large diameter (20, 30 or 35mm) locking pins with capacities of 2, 3 and 6 Te and capable of lifting sheets up to 18mm thick. MGF recommend that suitably rated single leg swivel chains with threaded shackles are always used for this attachment. Ensure excavator boom, attachment point and lifting chain are suitable for lifting the lengths and weights of sheets supplied.

• All MGF pitching shackles feature a simple safety mechanism that prevents the accidental release of the shackle in the event that the rope snags. A short length of chain is attached from the lever arm of the shackle to a metal ring, to which the nylon rope is attached. Once the locking pin is fully engaged through the handling hole of the sheet the ring is simply located on the hook to the side of the shackle and the rope laid out along the pan of the sheet to be lifted. This process ensures that the rope cannot snag and release the mechanism. When the sheet has been pitched the ring is released by the operative who will simply flick the rope vertically upward to release the ring off the hook and allow release of the sheet.

• Ensure valid LOLER test certification (minimum 6 monthly thorough examination) available on site and that a lifting plan is in place including a site specific risk assessment.

• Familiarise yourself with the exact working of the shackle supplied prior to lifting. Secure a suitable length of soft rope to the pin release mechanism using a suitable knot.

• Inspect shackle for any evidence of damage prior to every use and ensure spring loaded mechanism opens when the rope is pulled and snatches shut smoothly when released.

• Having attached the shackle to an appropriate chain / shackle on the excavator lift the shackle over the sheet

• Activate the pin release mechanism and with the pin in the retracted (open) position guide the jaws of the shackle over the top of the sheet. When the pin is positioned over the lifting hole, release the mechanism to the closed position ensuring the pin passes fully through the lifting hole in the sheet and into the shackle body. Ensure the mechanism lever arm is in the fully closed position (flat).

• Ensure the pin is fully through the hole, both by visual inspection and by checking again that the lever arm mechanism is fully closed.

• Loop the anti-snag rope ring over the hook and lay the rope flat within the pan of the sheet.

• The sheet can now be lifted.• Ensure all personnel close to or within the potential fall radius of the sheet are clear

from the lifting area and turned to watch the lifting operation.

MGF TRENCH SHEET / SHEET PILE ANCILLARIES


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• Carefully lift the sheet into the vertical position and place into the excavation at its proposed driving location. Ensure the sheet is stable and fully supported in a vertical orientation.

• The pin is now ready to be retracted. A firm pull on the release rope should then activate the mechanism and retract the pin from within the hole.

• Do not force mechanism or jar shackle violently.• When using shackle always ensure sheets are stacked on level ground on timbers so

as to allow the release lever to be safely activated by hand without the risk of trapping fingers / hands or the sheets slipping / sliding from the stack.

Mechanism locked and pin fully engaged. Anti-snag safety ring on rope hooked

into position.

Mechanism activated andpin fully retracted.

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The hole positions are standardised on all sheets to allow connectionof suitable MGF Pitching Shackles and Extractors.

Product ID*

SWL (Te)

Jaw Width (mm)

Pin Diameter (mm)

Weight (kg)

Jaw Depth (mm)

Suitable Sheets

PC-----

2

20

220

20

22

BS / L8

PC-----

3

20

220

30

24

FKD

PC-----

6

20

220

35

26

KKD / ER / FLP / VL

* Under LOLER each pitching shackle is uniquely identified

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EXTRACTORS: SAFETY NOTES

• MGF extractors are solely designed to raise or release previously installed MGF trench sheets or sheet piles (via pins slotted through handling holes) from within the confines of an excavation as part of the equipment removal process. Once released the extractor can be used to lift the sheets out and laid down / stacked adjacent to the excavation.

• All MGF Extractors are fitted with graded D shackles for attachment to appropriate lifting chains and large diameter (20mm or 38mm) locking pin mechanism; capacities of 2 & 6 Tonnes and capable of lifting sheets up to 18mm thick. MGF recommend that suitably rated single leg swivel chains with threaded shackles are always used for this attachment. Ensure excavator boom, attachment point and lifting chain are suitable for lifting the lengths and weights of sheets supplied.

• MGF Extractors are robust in design and are provided with a pin which is manually slotted through the jaws of the extractor and the sheet handling hole. This pin is manually secured by a captive latch mechanism and locating triangle at one end and additional security is ensured by securing the pin with an R-clip at the other end.

• Ensure valid MGF test certificate available on site and that a lifting plan is in place including a site specific risk assessment.

• Inspect extractor for any evidence of damage prior to every use.• Familiarise yourself with the exact working of the Extractor supplied prior to lifting.• Not to be used for general handling of sheets (use MGF Pitching Shackle).• Having attached the Extractor (ensuring pin lock is engaged) to an appropriate

chain / shackle on the excavator, lift the Extractor over the sheet, release the latch mechanism and R-clip to remove the pin before slotting the jaws of the extractor over the sheet and aligning the handling hole with the pin hole. Slot the pin fully through the jaws and handling hole ensuring the pin is locked over the locating triangle with the latch closed and R-clip secured.

• Ensure the pin is fully through the hole, both by visual inspection and by ensuring the end of the pin is protruding beyond the rear of the Extractor clamp, and the R-clip is in place.

• The extractor is ready for use.• With all personnel clear from the lifting area and turned to watch the lifting operation,

the pile can now be extracted.• Extract the sheet using a smooth and even pull. Do not snatch.• Once extracted carefully lay the sheet down on a clear area / stack of sheets and

release Extractor (reverse of above procedure).2.2.1Rev 2



• Do not shake / tap / drag the sheets.• Stand well clear when the sheet is being lifted and ensure all personnel are made

aware of all lifting operations.• Do not lift above personnel, force pin or jar Extractor violently.

The hole positions are standardised on all sheets to allow connection of suitable MGF Pitching Shackles and Extractors.

Product ID*

Load Capacity (Te)

Jaw Width (mm)

Pin Diameter (mm)

Weight (kg)

Jaw Depth (mm)

Suitable Sheets

TSE-----

2

20

220

20

23

BS / L8 / FKD

TSE-----

6

20

220

38

27

KKD / ER / FLP / VL

* Under LOLER each extractor is uniquely identified

The R-clip is attached to the D-shackle on the extractor with a secured metal wire, so it cannot be lost. The wire also helps with removing the R-clip.

R-clip secured

EXTRACTOR PIN FULLY LOCKED

Captive latch locked

Locating triangle engaged on pin

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DRIVING CAPS: SAFETY NOTES

• MGF Driving Caps are designed to be used with the full range of MGF Trench Sheets. The caps are slotted over the tops of trench sheets allowing them to be quickly and easily driven into the ground using the bucket of an excavator without damaging the sheet. They can be installed by hand and are provided with lifting points to assist installation / removal.

• MGF Driving Caps are heavy (up to 19kg) and can be dislodged if struck or the sheets allowed to slip / rotate. If dropped they could cause severe injuries. Operatives should never stand beneath an installed driving cap and great care must be taken during installation and removal to ensure that they cannot be dropped onto personnel.

A minimum of two operatives are required to install / remove the driving caps and care must be taken to ensure that the installation is carried out at all times from a position of safety and that both the sheet and driving cap are stable / secure. At no point should any operatives be leaning over an unsupported edge nor should an operative carry the driving cap whilst ascending an access ladder / platform.

• Only use in conjunction with MGF products. Ensure that the driving cap is suitable for use with the sheets provided and that there are no obvious signs of damage.

• Depending on the lengths of sheets provided and ground levels, assess the height above ground that the top of the sheet will be when the cap is to be installed. Suitable safe means of access must then be provided for the installation to proceed.

To minimise work at height MGF recommend that the sheets are installed within a pre-dug trench and gently driven a minimum of 300mm into the ground by the excavator bucket to ensure stability prior to placing the driving cap on the sheet.

• Once installed check to ensure that the cap is stable and cannot be easily dislodged during driving operations.

• Particular care is required when using long sheets (Work at Height) or in high winds when sheets are more difficult to handle.

• When driving the sheets ensure sheet is vertical, square and in the correct alignment before gently pushing vertically downwards. Take care to ensure that operatives hands / fingers cannot be trapped and that the excavator driver has a clear view of the operation.

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• Sheets should be driven as far down as is practicable without causing the sheet to bend / buckle.

• Operatives must ensure that they do not stand directly beneath the bucket or jib of the excavator during driving operations.

• Once the excavator bucket has been moved clear of the area, the cap may be removed.

Suitable Sheets

Product ID

Weight

Standard

2.301

10kg

Suitable Sheets

Product ID

Weight

FKD 400/6

2.302

14kg

Suitable Sheets

Product ID

Weight

KKD 600/6 KKD 600/8

2.303

19kg

Suitable Sheets

Product ID

Weight

L8

2.305

19kg

Suitable Sheets

Product ID

Weight

FLP 600/3.5FLP 600/6

2.304

19kg

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MGF HYDRAULICSYSTEMS ANCILLARIES

INTRODUCTION MGF supply a range of hydraulic ancillaries to assist with the installation and removal of the full range of MGF hydraulic bracing, bracing strut and waler systems. MGF hydraulic systems are supplied as either single acting (SA) or double acting (DA). Single acting systems can only be pumped out whilst double acting systems can be pumped both in and out.

The majority of MGF equipment utilises simple 20 to 30L bucket pumps which are operated by hand and connected using hydraulic hoses and quick release valves.

The larger hydraulic brace and hydraulic strut systems (1250kN to 2500kN SWL) require much larger (120 to 190L) motorised pump units which require a suitable 110V site electrical supply to operate.

SINGLE ACTING BUCKET PUMP: SAFETY NOTES • Prior to use check the fluid level indicator on the bucket. If the fluid level is low top up

with water / Houghto-Safe mixture (mixture determined by season - see section 3.3.1). Topping up should be carried out with a suitable funnel via the screwed cap on top of the bucket.

• Single acting bucket pumps are normally supplied with a 2-way hose bridle which should be connected to the bucket pump block. The 2-way bridle has a male quick release valve (QRV), which connects to the female QRV on the block and two female QRVs which connect to the male QRVs on up to 2 No. hydraulic strut cylinders. The 2-way bridle allows both struts on a waler frame to be pumped out simultaneously.

• Ensure that an MGF QRV release tool (1.595) and suitable socket spanner are available for the QRV’s and lock off valves.

• Ensure the correct PPE is provided including gloves and eye protection.• Ensure a COSHH assessment is in place for Houghto-Safe SF25B and that

arrangements for storage / spillage are in place.• Check hose connections are free from dirt and functioning. Inspect all hoses, checking

they are not cracked or worn, making sure to unravel any kinks.• Connect the hoses ensuring the isolation valves on the hydraulic strut cylinders are

opened (gentle two turns anti-clockwise) and the flow regulator switch on the bucket pump block switched from the neutral to active position.

• The pump is ready for use and can now be pressurised manually by pumping the level arm up and down. It is recommended that the bucket pump is sat vertically on firm level ground and is stabilised by the operative physically holding it down throughout the operation. The pressure level should be monitored continuously via the pressure gauge (must not exceed 1500 psi) and the struts monitored to ensure that the hydraulic rams extend as required.

• Great care must be taken once the system is under pressure. Prior to releasing the QRV’s always ensure that the hydraulic strut lock off valves are closed, the flow regulator is in the neutral position and the MGF release tool is used.

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Single Acting Bucket Pump

Product ID

Capacity

Shoring Fluid

1.602 (SA)

20-30 litres

Houghto-Safe SF25B

0-1500 psiInstallation Pressure

• If the hydraulic struts do not extend re-check the above steps (especially the flow regulator orientation) and that the hydraulic strut inner and outer are not jammed/restricted in any way. If they still do not extend check that no shoring fluid is leaking from the pump unit, hoses or the struts (damaged seals or struts beyond their full extension) and finally for air locks in the individual hoses / struts (purging required). Purging of hydraulic struts is carried out by standing the strut on its end (ensuring it cannot fall over) with valve block uppermost, and connecting an open hose to the “in” QRV. If any air is present the strut should collapse under its own weight, or with minor assistance.

MGF HYDRAULIC SYSTEM

S ANCILLARIESSHORING ANCILLARIES SECTION 3

Some SA pumps have a hose connected directly to the block so you only need to connect the 2-way bridle.

c/w 2-way bridle (1.611)

Male QRV connects to female QRV in block (highlighted in yellow).

Then 2 female QRVs on hose ends connect to the male QRV on 2 waler

cylinders or manhole brace legs.

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Dowty washer

⅜” BSPisolation valve

¼” BSP male QRV

¼” male to male

Typical Single Acting Hydraulic Cylinder Connections

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• Once the hydraulic struts are fully extended and the recommended pre-load pressure (1500 psi) achieved, the lock off valves on the hydraulic strut cylinders should be fully closed (hand tightened turning clockwise) whilst maintaining the pressure. Once this is done the flow regulator switch on the bucket pump block can be returned to the neutral position to release the pressure in the hoses and the hoses can now be removed using the MGF release tool.

• To retract the hydraulic struts, re-connect the hoses between the bucket pump and struts. Ensure that the flow regulator switch is in the neutral orientation and carefully open the strut lock off valves. The struts should now close, releasing the fluid back into the bucket pump reservoir if gentle physical compressive force is applied to the strut ends.

• Once retracted sufficiently, the strut lock off valves can be closed and the hoses released.

• During use MGF hydraulic struts are designed to generate extremely high fluid pressure of up to 7500 psi (500 Bar). When dealing with installed MGF hydraulic struts always assume that very high pressures are present and never attempt to forcibly release the QRV’s on the struts.

• Do not enter the excavation to adjust the equipment unless it is deemed safe to do so (taking into account whether the struts are required to be pressurised).

• Prior to pre-loading any hydraulic struts always ensure that at both ends the walers /frames are fully and evenly packed against the sheets / ground so as to allow the loads to be dispersed directly into the ground and not overload the walers / frames.

3.1.3Rev 2

Double Acting (DA) bucket pump comes with 2 hoses, either 3m or 6m lengths depending on the size of the

excavation / frame being used.

Retract tube

All DA cylinders have a lock off valve to lock off the (red) section once the cylinder is extended to stop it retracting. Then a male QRV and then a female QRV.

selector

retract

pump out



DOUBLE ACTING BUCKET PUMP: SAFETY NOTES • Prior to use check the fluid level indicator on the bucket. If the fluid level is low top up

with water / Houghto-Safe mixture (mixture determined by season - see section 3.3.1). Topping up should be carried out with a suitable funnel via the screwed cap on top of the bucket.

• Inspect all hoses, checking they are not cracked or worn, making sure to unravel any kinks.• Double acting bucket pumps are normally supplied with 2 hoses, either 3m or 6m long,

which should be connected to the bucket pump block. Each hose has a male quick release valve (QRV) on one end and a female QRV on the other end. The double acting bucket pump has a male QRV and a female QRV on the block, and the double acting hydraulic cylinder has a male and female QRV. The hoses are connected to the relevant QRVs.

• Ensure that a suitable socket spanner is available for the lock off valves.• Ensure the correct PPE is provided including gloves and eye protection.• Ensure a COSHH assessment is in place for Houghto-Safe SF25B and that

arrangements for storage / spillage are in place.• Check hose connections are free from dirt and functioning.• Connect the hoses ensuring the isolation valve on the hydraulic strut cylinder is

opened (gentle two turns anti-clockwise) and the flow regulator switch on the bucket pump block turned to pump out (see diagram below).

Product ID

Capacity

Shoring Fluid

1.603 (DA)

20-30 litres

Houghto-Safe SF25B


Double Acting Bucket Pump

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• The pump is ready for use and can now be pressurised manually by pumping the lever arm up and down. It is recommended that the bucket pump is sat vertically on firm level ground and is stabilised by the operative physically holding it down throughout the operation. The pressure level should be monitored continuously via the pressure gauge (must not exceed 1500 psi) and the strut monitored to ensure that the hydraulic ram extends as required.

• Great care must be taken once the system is under pressure. Prior to releasing the QRV’s always ensure that the hydraulic strut lock off valves are closed, the flow regulator is in the neutral position and the MGF release tool is used.

• If the hydraulic struts do not extend re-check the above steps (especially the flow regulator orientation) and that the hydraulic strut inner and outer are not jammed /restricted in any way. If they still do not extend check that no shoring fluid is leaking from the pump unit, hoses or the struts (damaged seals or struts beyond their full extension) and finally for air locks in the individual hoses / struts (purging required). Purging of hydraulic struts is carried out by standing the strut on its end (ensuring it cannot fall over) with valve block uppermost, and connecting an open hose to the “in” QRV. If any air is present the strut should collapse under its own weight, or with minor assistance.

Typical Double Acting Hydraulic Cylinder Connections

¼” BSP female QRV

OUT IN

¼” BSP male QRV


Dowty washer

¼” male to male

3.1.5Rev 2



• Once the hydraulic strut is fully extended and the recommended pre-load pressure (1500 psi) achieved, the lock off valve on the hydraulic strut cylinder should be fully closed (hand tightened turning clockwise) whilst maintaining the pressure. Once this is done the flow regulator switch on the bucket pump block can be returned to the neutral position to release the pressure in the hoses and the hoses can now be removed.

• To retract the hydraulic struts, re-connect the hoses between the bucket pump and struts. Ensure that the flow regulator switch is in the retract orientation and carefully open the strut lock off valves. The bucket pump can now be used to retract the struts by pumping the lever arm up and down, returning the shoring fluid back into the bucket pump reservoir.

• Once retracted sufficiently, the strut lock off valves can be closed and the hoses released.• During use MGF hydraulic struts are designed to generate extremely high fluid

pressure of up to 7500 psi (500 Bar). When dealing with installed MGF hydraulic struts always assume that very high pressures are present and never attempt to forcibly release the QRV’s on the struts.

• Do not enter the excavation to adjust the equipment unless it is deemed safe to do so (taking into account whether the struts are required to be pressurised).

• Prior to pre-loading any hydraulic struts always ensure that at both ends the walers / frames are fully and evenly packed against the sheets / ground so as to allow the loads to be dispersed directly into the ground and not overload the walers / frame.

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DOUBLE ACTING MOTORISED PUMP UNIT: SAFETY NOTES

• The motorised pump unit is used to extend and retract all double acting hydraulic cylinders with an axial capacity of 1250kN and 2500kN. There are two sizes of pump, 120 and 190 Litres. The pumps contain neat Houghto-Safe SF25B shoring fluid, and should never be topped up with water, meaning the mix is suitable for all seasons.

• The motorised pumps require a site electrical supply of 110V / 6.5kVA, any less will not sufficiently power the pump. Avoid long electrical cables which can lead to power losses. Use only electrical cable supplied by MGF (approx. 8m long) from the pump unit to the generator.

• To allow air out of the reservoir a valved gate connection is located on top of the unit.

• Prior to use check the fluid level indicator on the pump. If the fluid level is low top up with Houghto-Safe. Topping up should be carried out with a suitable funnel via the screwed cap on top of the bucket.

• Check all electrical connections on the pump unit for obvious signs of damage, ensuring all connections are secure and that the corresponding power lead attaches to the fitting with a good tight connection.

• The motorised pumps are normally supplied with 2 hoses, 10m long, which should be connected to the pump unit. Each hose has a male quick release valve (QRV) on one end and a female QRV on the other end. The motorised pump has a male QRV and a female QRV on the unit itself, while the double acting hydraulic cylinder has a male and female QRV. The hoses are connected to the relevant QRVs.

• Ensure that a suitable socket spanner is available for the lock off valves.• Ensure the correct PPE is provided including gloves and eye protection.• Ensure a COSHH assessment is in place for Houghto-Safe SF25B and that

arrangements for storage / spillage are in place.• Check hose connections are free from dirt and functioning. Inspect all hoses, checking

they are not cracked or worn, making sure to unravel any kinks.• The pump should only be lifted using the 4 lifting points on top of the unit. The unit

should be placed vertically on firm level ground with sufficient working space around it.• To use the pump the power plug must be first plugged into the socket on the front of

the unit and the green power button pressed once (under flap on side of unit).• Connect the hoses between the pump and the hydraulic cylinder, ensuring the isolation

valve on the hydraulic strut cylinder is opened (gentle two turns anti-clockwise).

Rating

Product ID

Capacity

110V, 6.5kVA

8.4001 / 8.4003

120 / 190 litres

Houghto-Safe SF25BShoring Fluid


3.2.1Rev 2

MOTORISED PUMP: SAFETY NOTES

• The pump is ready for use and can now be pressurised by moving the lever arm from neutral to pump out (the lever arm has to be held down continuously to operate). The pressure level should be monitored continuously (must not exceed 1500 psi) via the pressure gauge and the strut monitored to ensure that the hydraulic ram extends as required.

• Great care must be taken once the system is under pressure. Prior to release always ensure hydraulic strut lock off valves are closed and the flow regulator is in the neutral position and MGF release tool is used.

• If the hydraulic struts do not extend re-check the above steps (especially the flow regulator orientation) and that the hydraulic strut inner and outer are not jammed/restricted in any way. If they still do not extend check that no shoring fluid is leaking from the pump unit or the struts (damaged seals or struts beyond their full extent) and finally for air locks in the individual hoses / struts (purging required). Purging of hydraulic struts is carried out by standing the strut on its end (ensuring it cannot fall over) with valve block uppermost, and connecting an open hose to the “in” QRV. If any air is present the strut should collapse under its own weight, or with minor assistance.



Typical 1250/2500kN Double Acting Hydraulic Cylinder Connections

¼” BSP female QRV

OUT IN


Dowty washer

¼” male to male

¼” BSP male QRV

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• Once the hydraulic struts are fully extended and the recommended pre-load pressure (1500 psi) achieved, the lock off valves on the hydraulic strut cylinders should be fully closed (hand tightened turning clockwise) whilst maintaining the pressure. Once this is done the flow regulator arm on the pump can be returned to the neutral position to release the pressure in the hoses and the hoses can now be removed.

• To retract the hydraulic struts, re-connect the hoses between the pump and struts. Ensure that the flow regulator switch is in the retract orientation and carefully open the strut lock off valves. The pump can now be used to retract the struts by moving the lever arm to the retract position, returning the shoring fluid back into the pump reservoir.

• Once retracted sufficiently, the strut lock off valves can be closed and the hoses released.

• During use MGF hydraulic struts are designed to generate extremely high fluid pressure of up to 7500 psi (500 Bar). When dealing with installed MGF hydraulic struts always assume that very high pressures are present and never attempt to forcibly release the QRV’s on the struts.

• Do not enter the excavation to adjust the equipment unless it is deemed safe to do so (taking into account whether the struts are required to pressurised).

• Prior to pre-loading any hydraulic struts always ensure that at both ends the walers / frames are fully and evenly packed against the sheets / ground so as to allow the loads to be dispersed directly into the ground.

• When removing shoring fluid it may be necessary to attach a hose to the gate valved connection on top of the unit allowing the reservoir, when full, to overflow into a suitable container.

3.2.3Rev 2

MGF Double Acting Motorised Pump

HOUGHTO-SAFE SF25B SHORING FLUID: SAFETY NOTES • Houghto-Safe SF25B is a bio-degradable shoring fluid.• COSHH data sheets are available upon request.• Relevant PPE should be worn when dealing with shoring fluid, this includes gloves and

eye protection.• Houghto-Safe SF25B can be diluted with water, which affects its freezing points. MGF

supplies neat Houghto-Safe within the motorised pump units, and seasonal mixtures with the hand bucket pumps. During the Summer months the shoring fluid is diluted with water at a ratio of 3 parts water to 1 part Houghto-Safe SF25B. In the Winter months the mix is a 1:1 ratio.

SA Waler 1.6

SA 120 Series Manhole Brace 2200-3600 2.8

DA 200 Series Manhole Braces 4.7SA 200 Series Manhole Braces 2.4

SA 120 Series Manhole Brace 1700-2500 1.6

Hydraulic Cylinder Type Shoring Fluid Capacity (L)

DA 203UC Powerpack 3.1DA 254UC Powerpack 7.9

DA 150 Series Manhole Braces 3.7

DA 305UC Powerpack 9.2

DA 600kN Strut 9.2

DA 2500kN Strut 39.2DA 1250kN Strut 25.1

DA 406UC Powerpack 25.1

Parts SF25B

Parts added water

Freezing point deg C

1

0

-50

5

1

-45

4

1

-40

3

1

-36

2

1

-26

1

1

-13

1

2

-7

1

3

-4

1

6

-2

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3.3.1Rev 2

MGF Edgesafe

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INTRODUCTION MGF manufacture a unique range of excavation safety systems to help customers using MGF excavation support systems to comply with the Work at Height Regulations, CDM Regulations and Confined Spaces Regulations

The systems are designed to be compatible with the full range of MGF shoring products and comply with relevant legislation / standards as appropriate.

Current health and safety legislation requires that construction equipment users always formulate a site specific Safe System of Work (SSoW) to undertake the works they are proposing. These documents are intended to provide sufficient product specific guidance on handling, installing and removing MGF equipment to allow the SSoW to be compiled. They should always be read in conjunction with the product specific technical files and any site specific design information provided by MGF or others.

EDGESAFE: SAFETY NOTES • MGF Edgesafe is a lightweight temporary edge protection panel system designed to

be quickly and easily installed by hand on a number of MGF products (Boxes, Trench Sheets or Sheet Piles). The panels are supplied in a variety of lengths (0.5m to 3.5m) with two steel clamps (various clamp designs available to suit the specific products) which slot over the top edges of MGF products and are then tightened to prevent the panels being accidentally dislodged. The individual panels weigh between 8 and 38kg and the clamps an additional 2.6 to 3.5kg each.

• A minimum of two operatives are required to install / remove the panels and great care must be taken to ensure that the installation is carried out from a position of safety avoiding the need to reach out or lean over a vertical drop. At no point should any operatives be working adjacent to an unsupported edge (in case edge collapses) nor should the panels be installed or removed whilst operatives are immediately below. It is recommended that a minimum 1.2m wide level area is provided at the side of the excavation to allow for safe installation.

MGF SHORING SAFETY SYSTEMS

4.1.1Rev 2

MGF SHORING SAFETY SYSTEM

SSHORING ANCILLARIES SECTION 4

• MGF Edgesafe is supplied in accordance with BS EN 13374 (2004) Class A temporary Edge Protection Systems.

• MGF Edgesafe is not a pedestrian barrier and is only designed to protect an edge from a single operative accidentally falling against the barrier.

• The barrier should not be used against steeply sloping ground (anything greater than 10 degrees) as there is a risk that higher impact loads may occur, overloading the system.

• Do not use panels to support ladders, services, equipment or materials.• Take care handling, storing and stacking panels as they can be easily bent / damaged.• Ensure panels and clamps are not damaged and that the correct clamps are provided

and located in suitable positions for a safe installation. Ensure panels are provided with all bolts present and serviceable. Ensure clamps are securely attached to the panels by tightening the M16 bolts provided and that the M12 set screws for the clamp are opened out so as not to snag when slotting into position. N.B. Most panels have alternative clamp fixing locations

• Lift panel vertically and slot clamps over box / sheet.• Ensure both panel clamps are fully slotted and panel stable/square before tightening

the set screws. Particular care must be taken when tightening the screws to ensure that there is no danger of falling into the excavation. The panels are reversible and it is therefore possible to locate the tightening screws on either the inside or outside face (subject to a site risk assessment establishing the safest orientation for installation /removal).

• Once tightening is completed check panel cannot be easily lifted or slide sideways.• Ensure Upper rail is a min 1.0m above ground level and that gaps inbetween in the

panels are no greater than 250mm.• Removal is a reverse of installation.

60 THICK PANEL CONNECTOR CLAMP The top 2 holes are used to connect the clamp to

the edge safe panel, using M16 bolts c/w nuts and washers. The bottom 2 holes are tapped for M12

set screws, which are used as clamping bolts.

Product ID

Weight

4.317

3.0kg

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110 THICK PANEL CONNECTOR CLAMP The top 2 holes are used to connect the clamp to

the edge safe panel, using M16 bolts c/w nuts and washers. The bottom 2 holes are tapped for M12


Product ID

Weight

4.316

3.5kg

16 THICK SHEET SWIVELCONNECTOR CLAMP

The top 2 holes are used to connect the clamp to the edge safe panel, using M16 bolts c/w nuts and washers. The bottom 2 holes are tapped for M12


Product ID

Weight

4.318

2.6kg

* Panel only - excludes clamps

500 4.319 8

2000 4.320 20

3000 4.330 312500 4.325 25

1000 4.3195 13

Description Product ID Weight* (kg)

3500 4.335 38

Alternative connecting clamp locations

4.1.3Rev 2

MGF Endsafe Strut

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ENDSAFE: SAFETY NOTES • MGF Endsafe Panels are designed to be installed

quickly and easily by an excavator using the excavate and lower technique. They are designed to support the open ends of trenches created using MGF Box Systems or sheets and walers.

• MGF Endsafe Panels are supplied in accordance with BS EN 13331:2002 Parts 1 & 2 Trench Lining Systems.

• Panels are very heavy and great care must be taken in selecting a suitable excavator for handling, installing and extracting.

• Panels should not be left in-situ for extended periods within cohesive or very weak soils as earth pressures / adhesion on the panel surfaces may increase significantly with time requiring additional extraction forces to release them.

• Always use MGF specified lifting chains when lifting and handling the boxes or components.

• During lifting or extraction operations ensure personnel are well clear of the equipment.

• Customer must ensure that prior to use checks are made confirming that the installed panels can each bear a minimum 75mm onto the walers or the trench box panels either side of the trench. In addition the panels must be square and plumb with soil packed evenly against the back face to ensure the panels cannot slip, slide or rotate during the proposed works.

• If using multiple panels it is recommended that the panels are laid flat on timber skids and connected together using the connecting clamps. The M45 bolts must be fully tightened prior to lifting and lowering the completed panel vertically into position.

• Carefully lower the panel vertically into position ensuring that the panel sits squarely against at least two levels of horizontal support from the boxes / walers.

• Whilst ensuring that the panel is stable and cannot slip, slide or rotate carefully backfill against the outside face to fully secure the panel against the boxes / walers.

• It is recommended that the backfill extends to a minimum 0.5 x the depth of the trench.• Removal is a reverse of installation.

1800 x 1200 4.191 152

2400 x 1800 4.193 3103000 x 2000 4.194 420

2400 x 1200 4.192 200

Desc. (L x H) Product ID Weight (kg)

Connecting Clamps and M45 bolts and nuts

4.2.1Rev 2

ENDSAFE STRUTS: SAFETY NOTES • MGF Endsafe Struts are designed to be quickly and easily installed by hand to support

the open end of a trench run created using MGF sheets and walers.• MGF Endsafe Struts are supplied in accordance with BS EN 13331:2002 Parts 1 & 2

Trench Lining Systems.• Prior to use inspect the equipment for damage and make yourself familiar with its assembly.• The struts are telescopic and whenever being handled they should be fully closed with

the central pin and R-clip secured to prevent any sliding / trapping of fingers. Always use the handles provided.

• Always work from a position of safety and ensure that the soil beyond the end of the trench is stable / battered back and cannot collapse onto personnel installing the struts.

• Offer the strut up to the walers and remove the central pin, extending the strut so that the end sits squarely within the waler rails. Install the pins through the waler rail locating holes and struts to secure the ends. Secure pins using the R-clips. The central pin can now be secured although this is not essential provided the minimum overlap between the inner and outer exceeds 100mm.

• Trench sheets can now be installed against the outside face of the struts by carefully lowering down vertically. The sheets must be provided with at least two levels of support from either the struts or a minimum driven toe of 300mm into the soil at the base of the excavation. NB Great care must be taken to ensure these sheets do not impact existing underground services.

• Whilst ensuring that the sheets are stable and cannot slip, slide or rotate carefully backfill against the outside face to fully secure them against the struts. It is recommended that the backfill extends to a minimum 0.5 x the depth of the trench.

• Removal is a reverse of installation. • Alternatively the struts can be installed / removed as part of the waler and strut frame

assembly.

Inner MaterialInner Unit Mass

90x90x4 SHS (S355)10.5kg/m

100x100x4 SHS (S355)Outer Material11.9kg/mOuter Unit Mass

15kg-24kgOverall Weight

Suitable for trench widths of between 650mm and 1800mm

Ø16mm pins and R-clips



550 Outer 1.700

884 Inner 1.7021134 Inner 1.703

634 Inner 1.701

Component Product ID

1384 Inner 1.704

4.2.2Rev 2

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SAFE WORKING LOAD FORWALER END PROTECTION STRUTS

Recommended SWLArrows indicate recommended inner section lengths to achieve desired range.

4.2.3Rev 2

MGF Laddersafe

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LADDERSAFE: SAFETY NOTES

• MGF Laddersafe is a simple gated ladder access platform designed to be quickly and easily installed on a number of MGF products (Boxes, Trench Sheets or Sheet Piles). The platforms are supplied with a variety of clamps (designed to suit the specific products) which slot over the top edges of the MGF products and are then tightened to prevent the platforms being accidentally dislodged. The platforms weigh between 156kg and 277kg and are provided with removable ladder rest poles allowing a pole ladder to be safely rested and secured against either side of the platform. N.B. Longer ladder rest poles and platforms are provided to cater for the additional overhang on braced / framed cofferdams.

• MGF Laddersafe is supplied in accordance with BS EN 13374 (2004) Class A temporary Edge Protection Systems.

• Laddersafe platforms weigh between 156kg and 277kg and must be lifted into place by a suitable lifting device using chains attached to the two lifting points provided. A minimum of two operatives are required to install / remove the platforms and great care must be taken to ensure that the installation is carried out from a position of safety avoiding the need to reach out or lean over the excavation, or be dragged over a vertical drop by the platform swinging outwards. At no point should any operatives be working adjacent to an unsupported edge (in case edge collapses) nor should the platforms be installed or removed whilst operatives are immediately below. It is recommended that a minimum 1.2m wide level area is provided around the platform to allow for safe installation.

• MGF Laddersafe is only designed for use by one operative at a time. • Ensure platform and clamp are not damaged and that the correct clamp is provided

for the MGF equipment it is being fitted to. Check that the clamping bolts are all present and can be easily tightened. Check that the area is large enough and clear for installation to proceed safely. Mark the exact location for the clamp and confirm that the clamp will not snag during installation and that when fully seated the platform level will be suitable in relation to the surrounding ground levels. Confirm to which side the ladder will rest and ensure that the removable ladder pole rest is on the correct side of the platform and fully screwed in (no thread showing). If a platform extension is required (Type 1 when used with braced cofferdams) ensure that it is firmly slotted into place on the front of the clamp and the 2 No. M16 clamping screws tightened.

4.3.1Rev 2



• Attach lifting chains to lifting points ensuring that there is no visible evidence of damage to the lifting points or lifting equipment.

• Lift platform vertically and lower onto the sheets / panels. It is recommended that tag lines are attached to the platform to allow operatives to safely guide the clamp into position without getting too close to the load (danger of dropped load).

• Once the clamp is fully seated and level/square release the load and remove the chains. Additional steel packings or hardwood bearing may be required for uneven ground or sheets.

• Ensure clamps are securely attached to the panels / sheets by tightening each of the M45 bolts provided. Particular care must be taken when tightening the bolts to ensure that there is no danger of falling into the excavation. It is essential that all clamping bolts are fully tightened.

• Once tightening is completed check platform cannot be easily rocked when standing on it and that there are no trip hazards when accessing the gate (additional ramps or re-levelling may be required).

• Lift the pole ladder into position (minimum two operatives when man handling), securely foot the ladder and then lean it against the ladder rest and securely lash ladder stiles and rest together. Ensure ladder is at an angle to the vertical of between 65 and 75 degrees and that at least one rung extends beyond the top of the ladder rest. In addition ensure that the ladder sits squarely on the rest, does not clash with walers lower down and that the gap between the inner ladder stile and platform is minimised.

• Ensure Upper rail around the platform is a min 1.0m above ground level.• Removal is a reverse of installation.

• Do not use platforms to support services, equipment or materials.• Take care handling, storing and stacking platforms as they can be easily bent or damaged.• Prior to installation, the bolts on the Laddersafe clamp should be fully unscrewed,

to allow for ease of lowering the unit into position. Once in position the bolts can be screwed in and tightened sufficiently.

• When Laddersafe units are being transported the gate should be lashed closed to prevent damage.

The ladder resting pole is screwed into the required

side of the Laddersafe unit.

If a platform extension is required it slots within the pockets on the front

of the clamp and is secured by M16 set bolts.

Once assembled the Laddersafe unit can

be lifted by connecting hooks to the lifting

shackles or lifting lugs.

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TYPE 1 LADDERSAFE INSTALLATION

The Trench Box / Sheet Laddersafe fits onto all 60 and 100 thick Trench and Manhole Boxes and ER 750/8,

FKD 400/6, KKD 600/6 and KKD 600/8 Trench Sheets. Each bolt spreader plate

should tighten up against a pan of the trench sheet / box panel. When being used on Trench Sheets the platform

extension should always be used.

Product ID

Weight

4.301

156kg


The Drag Box Laddersafe is designed to fit around the rear strut pocket for

all the 100 thick Drag Box panels. For the 60 thick panels the

Laddersafe can not fit around the rear strut pocket, but can be placed

between the panel lifting lugs.

Product ID

Weight

4.302

166kg


The Larssen Laddersafe is designed to fit over 3 successive pans of

Larssen sheets. The bolts should line up with the centre of each pan. It will fit on VL602, VL603, VL604,

VL605 and VL606 MGF sheet piles. It will also fit on a number of other

interlocked sheet piles.

Product ID

Weight

4.303

277kg

4.3.3Rev 2



LADDERSAFE: CLAMPING DETAILS • Where possible the spreader plates on the clamping bolts should bear up against flat

pans of the trench sheets / sheet piles.

FKD 400/6 Trench Sheets

KKD 600/6 & KKD 600/8 Trench Sheets

ER 750/8 Trench Sheets

TYPE 1 LADDERSAFE

TYPE 3 LADDERSAFE

VL606 Sheet Piles

VL604 Sheet Piles VL605 Sheet Piles

VL602 Sheet Piles VL603 Sheet Piles

4.3.4Rev 2

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STAIRSAFE: SAFETY NOTES

• MGF Stairsafe is a compact, lightweight, single person temporary stair access system for use in cofferdams where ladder access is not acceptable. A variety of 2 component stair systems are available to enable a number of configurations and heights to be achieved. Individual components are simply attached to each other by means of a hook over detail and securing chain. The stair flights range in weight from 250 to 480kg and are suitable for stair flights between 3.0m and 6.0m high. The gated platforms are normally supplied as a straight run, however left turn or right turn platforms can also be supplied on request. The Stairsafe width is 600mm between handrails and the stair flight is installed at an angle of 45 to 55 degrees to the horizontal.

• MGF Stairsafe is supplied in accordance with BS EN 12811:1(2003) Temporary Works Equipment - Scaffold Design

• A minimum of two operatives are required to install the components and great care must be taken to ensure that they carry out the work from a position of safety, avoiding the need to reach out or lean over the excavation or be dragged over a vertical drop by the components swinging outwards. At no point should any operatives be working adjacent to an unsupported edge (in case edge collapses) nor should the stairs be installed or removed whilst operatives are immediately below. It is recommended that a minimum 2.0m square area is provided at the base to allow for safe installation.

• Installation is normally commenced by installing the MGF Laddersafe platform (refer to section 4.3.3). The location should be carefully checked for suitability in use and sufficient clear space for installation together with a secure and stable footing.

• Once the platform is fully secure the stairs can be lifted into position (using suitable chains attached to the lifting points) with the top end hooking over the locating bar on the platform and the swivel foot detail bearing on a suitable pre-prepared footing at the base of the excavation. The hook detail and swivel foot allow the rake of the stairs to be installed at between 45 and 55 degrees for flexibility on site.

• Once securely located the safety chains (to prevent accidental dislodging of stairs from platform) should be attached prior to releasing the lifting chains. The swivel base should be securely bolted to the pre-prepared footing.

4.4.1Rev 2



• Visually inspect the stairs to ensure that the hook detail is secured, the safety chains attached and that there are no gaps in the platform / edge protection/stair handrail system. Also ensure that there are no obstructions / trip hazards or other restrictions for the safe use of the stairs.

• The stairs may now be used.• Ensure that only one person uses the stairs at a time and that the stairs do not sway,

vibrate or deflect excessively during use.• At regular intervals ensure stairs are visually inspected for evidence of damage /

distress, paying particular attention that the hook detail is fully engaged and that there are no gaps in the edge protection.

• Removal is a reverse of installation.

A lifting beam can be provided

to assist with handling of the Stairsafe unit. The Stairsafe

should be lifted in it’s intended orientation (45 to 55 degrees), this will ease

with connecting to the installed

Laddersafe.

The connecting detail on the Stairsafe should hook over the tube

on the Laddersafe. This detail allows the Stairsafe to swivel to correctly place and secure the base detail, which can also swivel to allow for

the angular range of the unit.

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2.5m Stairsafe 4.371 227 2.3 to 2.7m

4.5m Stairsafe 4.372 366 4.2 to 4.8m

Swivel Foot Detail N/A 50 N/A5.5m Stairsafe 4.374 416 5.1 to 5.8m

3.5m Stairsafe 4.370 275 3.2 to 3.7m

Product Description Product ID Weight (kg) Platform to Formation (H)

Swivel Foot Detail - 1 Step N/A 70 0.23mSwivel Foot Detail - 2 Step N/A 85 0.46m

Stairsafe hook and lashing chain detail Standard Stairsafe Swivel Footing

4.4.3Rev 2

MGF Davitsafe

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DAVITSAFE: SAFETY NOTES

• MGF Davitsafe is a simple two piece steel pole mounted cantilevered lifting beam (davit) which when combined with a heavy duty steel base clamp (two types available) can be quickly attached to a variety of MGF shoring systems (Boxes, Trench Sheets or Sheet Piles). The davit is designed to be used in conjunction with MGF emergency evacuation winches and fall arrest systems and was developed to meet the requirement to provide a means of rescue to satisfy the Confined Spaces Regulations. The clamps (designed to suit the specific products) slot over the top edges of the MGF products and are then tightened to ensure the davit poles remain vertical and can resist the overturning moments generated when lifting a person out of the excavation. The Davit arm weighs 20kg and the pillar 50kg whilst the clamps weigh between 80 and 84kg.

• MGF Davitsafe has a max SWL of 135kg and is supplied in accordance with LOLER and BS EN 795 (Class B Anchorages).

• The Davitsafe clamps are extremely heavy and must be lifted into place by a suitable lifting device using chains attached to the bars provided on top of the clamp. The pillar and arm however are capable of being installed separately by hand. The pillar is supplied with a lifting point on its top which can be used for lifting the pillar into place if required. N.B. It should not be used for lifting the entire assembly as the assembly would not be stable and the clamp or arm could disengage during lifting. A minimum of two operatives are required to install / remove the davits and great care must be taken to ensure that the installation is carried out from a position of safety avoiding the need to reach out or lean over the excavation or be dragged over a vertical drop by the pillar rotating or the clamp swinging outwards. At no point should any operatives be working adjacent an unsupported edge (in case edge collapses) nor should the panels be installed or removed whilst operatives are immediately below. It is recommended that a minimum 2.5m wide level area is provided around the Davitsafe to allow for safe installation and use.

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• Stability of the Davitsafe in use is wholly reliant upon the strength and stability of the sheet / box panel the clamp attaches to. Prior to installation the customer must ensure that the sheet / box panel is rigid, square, plumb and secure enough to resist the loads

when lifting a 135kg load. MGF Davitsafe must therefore never be clamped to cantilevered sheets, lightweight sheets, sheets where supporting waler is greater than 1.0m below ground level or where the panel / sheet is not plumb or can slide / slip or rotate.

• Only secure the clamp to compatible MGF products. Only use davit with MGF approved fall arrest / retrieval systems.

• MGF Davitsafe is only designed for emergency use, lifting a single person in either a harness or stretcher. It must not be used for lifting equipment or materials.

• Ensure all components are not damaged, valid test certificates are available on site and that the correct clamp is provided for the MGF equipment it is being fitted to. Check that the clamping bolts are all present and can be easily tightened. Check that the area is clear for installation to proceed safely. Mark the exact location for the clamp and confirm that the clamp will not snag during installation and that when fully seated the Davit arm level will be suitable for its proposed usage and the area free of obstruction in the event that a rescue by stretcher had to be performed. Confirm to which side the davit would lay a stretcher down and ensure that neither the davit nor stretcher will snag and that the stretcher can be easily laid down flat.

• Ensure that the pillar base and davit seating plates are free from dirt and are lightly oiled prior to use.

• Attach chains to the clamp and lift clamp vertically and lower onto the sheets /panels at location marked ensuring tightening bolts face outwards (to allow tightening from position of safety). It is recommended that tag lines are attached to the clamp to allow operatives to safely guide the clamp into position without getting too close to the load (danger of dropped load). Clamp should be lifted just above ground level to minimise consequences of a dropped load.

• Once the clamp is fully seated and plumb / square release the load and remove the chains. • Ensure clamps are securely attached to the panels / sheets by tightening each of the

M20 bolts provided. It is essential that all four bolts bite into the metal of the box panel / sheet. Particular care must be taken when tightening the screws to ensure that there is no danger of falling into the excavation.

• Once tightening is completed check clamp cannot be easily rocked / rotated / slide.• Lift the pillar into the socket at the rear of the clamp ensuring that the socket is fully

engaged (pillar collar will bear against clamp socket). Rotate the handles to ensure pole is free to rotate within socket and stands plumb in each orientation. If not plumb re-assess installation / location before attempting to adjust / relocate.

• Rotate pillar so that arm can be safely installed by hand from a position of safety. Attach arm by lifting into place and dropping the two pins into their respective locating lugs. Ensure davit is free to swing before locking in place using the locking pin on the lower lug. Ensure a tag line is attached to the jib.

• Davit is now ready for use. For installation of emergency retrieval winch and fall arrest refer to specific manufacturers instructions supplied.

• Ensure that winch / fall arrest is securely fitted in accordance with the manufacturers instructions and that adequate edge protection is afforded to operatives around the Davit pillar prior to use (no gaps greater than 250mm wide).

• It is strongly recommended that a trial lift of approx. 100kg is carried out by using the winch to lift an object approx. 150mm off the base of the excavation and ensuring that the pillar can rotate in its socket under this load.

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• If during the trial lift any rotation of the clamp occurs or the pillar cannot be rotated in its socket the clamp must be adjusted or relocated.

• During normal use the davit arm should be locked in a position so that it can be easily accessed and does not interfere with site operations / nor pose a head height hazard for operatives.

• Removal is a reverse of installation. Always ensure fall arrest / winch are removed before attempting to dis-assemble. Never lift the complete assembly and winch as one.

• Do not use davit for lifting materials / equipment. Max SWL is 135kg. • Take care handling, storing and stacking davits as they can be easily damaged.

MGF Fall Arrest and Recovery Winch Ridgegear RGA4 (or similar approved) with Fixing Bracket

Lifting Point

Ridgegear RGK1 Karabiner and RGRTn Pulley (or similar approved)

Rope Tag Line

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GENERAL SAFETY TIPS FOR THE USE OF FALL ARRESTS • It is recommended that users always wear a safety harness when working in

conjunction with the fall arrest.• Great care in locating the Davit arm is required to ensure the line is free to extend /

retract and in the event of a fall the user is not swung violently to one side. When deployed as a fall arrest the Davit arm can either be locked in position or allowed to swing (subject to a risk assessment).

DESCENT• Place the winch arrestor / retriever into fall arrest mode. Securely attach the arrest

line safety hook onto the harness using the correct attachment. Release the retriever blue cord that is attached to the safety hook allowing it to be lowered down into the work area. When safe to do so, descend slowly into the work area. In doing so the winch arrest line will automatically pay out as the user descends. It is recommended that during such personnel descents / ascents that a top side safety person is employed as a visual safe guard. At the foot of the descent and once the user is on safe ground the blue cord should be firmly gripped approximately two feet from the safety hook connection, release the safety hook from the harness connection. The system will automatically try to retrieve the line upwards towards the top of the block. Care should be taken not to allow the return tension to over ride this part of the operation as the line will be taken in uncontrolled and will cause internal damage to the winch arrest system. This situation can be controlled by slowly releasing the blue cord, hand over hand, thus allowing the line to ascend safely. Once this operation is complete safely secure the loose end of the blue cord on a fitting where no harm can be caused.

ASCENT• In the ascent mode the arrest line should be pulled down into the working area by

using the blue cord and the above instructions should be carried out in reverse. During ascent the loose end of the blue cord may be loosely tied off at the base of the ladder.

FALL ARREST• During descent / ascent should a fall situation occur, the user will be safely arrested

and will remain suspended by the system until assistance is given. Firstly lock the Davit arm into rigid mode by means of the locking pin on the pillar arm. As quickly as is safely practicable the winch mechanism should be activated and the user can be lowered down into the working area (normally the preferred option) or raised to ground level. If raised to ground level a suitable (temporary) space should be created in the edge protection system before releasing the locking pin on the jib arm and pulling the jib arm over the side of the excavation to land the user on a safe area of ground (the edge protection should be immediately replaced).

• Once the user is safely grounded they can be released from the arrestor (and the Davit / arrestor secured).

• User should not be suspended for any length of time as harness suspension can quickly lead to circulatory issues.

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DAVITSAFE CLAMPS

RECOMMENDED CLAMPING DETAILS• All Type 1 Davits are supplied with M20 x 150 set

bolts, to be used in the configurations shown below.• All Type 2 Davits are supplied with M20 x 100 set

bolts.

When using the Type 1 Davit clamp on FKD 400/6 trench sheets the sheets

must be fully driven in pairs as shown above.

ER 750/8 Trench Sheets

KKD 600/6 & 600/8 Trench Sheets

FKD 400/6 Trench Sheets

Larssen Sheet Piles

TYPE 1 DAVITSAFE CLAMP The Type 1 Davit clamp will fit onto all

MGF box panels as well as KKD, FKD and ER trench sheets.

Product ID*

Weight

DAV------

80kg

TYPE 2 DAVITSAFE CLAMP The Type 2 Davit clamp will fit onto all

MGF Larssen sheet piles.

Product ID*

Weight

DAV------

84kg

* Under LOLER each davit component(including pillar, jib and clamp) is uniquely identified

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HEAD OFFICEGRANT HOUSE

LOCKETT ROADASHTON IN

MAKERFIELDWIGAN, WN4 8DE

T: 01942 402700

ENGINEERING CENTRE

FOUNDATION HOUSE WALLWORK ROAD

ASTLEY, MANCHESTERM29 7JT

T: 01942 402704

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EAST ANGLIA – STANTON DEPOTUnit 5, O’Brien Ind. Est.Grove Lane, StantonBury St. EdmundsSuffolk, IP31 2BFT: 01359 252204

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SOUTH WEST – EXETER DEPOT Unit 58, Greendale Business ParkWoodbury Salterton, ExeterEX5 1EW T: 01395 233194

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[email protected]

Export products available worldwide

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Documents

Guidance for Safe Systems of Work · 2019. 10. 4. · with LOLER and restraining chains in accordance with BS EN . 14653:2005 Manually Operated Shoring Systems for Groundwork Support