CONSTRUCTION MANAGEMENT PLAN METHOD STATEMENT & …

CONSTRUCTION MANAGEMENT PLAN

METHOD STATEMENT & RISK ASSESSMENTS

CLIENT: PRIVATE CLIENT

CONTRACT: 18 DEVONIA ROAD, LONDON, N1-8JH

GROUNDWORKS & UNDERPINNING TO FORM LOWERED

BASEMENT & EXTENDED BASEMENT, INTERNAL STRUCTURAL

WORKS

Method Statement: DR01 (REV 00) 02/09/17

Information Prepared by:

Malcolm Furniss BSc(Hons), MCIOB, CMIOSH, CMaPS.

KJV Construction Ltd Health & Safety Manager

Email: [email protected]

00 02/09/17 Malcolm Furniss Initial Issue

Rev No: Date: Written KJV Rev by Details

mailto:[email protected]

KJV MSRA – DR01 2 of 30

1.0 SCOPE OF WORKS

The work consists of the structural works to form the underpinning, underground and

ground structure to lower the existing basement under an existing property, then

extend the basement to the and rear largely via an open site works and underpin

method.

The works will also include the underpinning of the vaults to enable the floor slabs to

be lowered

The existing internal structure will be removed up ground floor and the rear part of the

first floor, to be resupported on a concrete lining wall from the basement and internal

structural steelwork.

At roof level a new mansard structure will be installed which will also serve to support

the chimneys enabling those deemed to be removed to be carefully removed and the

wall made good from roof level to existing basement level.

The underpins being formed within the existing structure as per plan and section

extract below:


The existing structure will be retained whilst underpinning is undertaken.

The works will also comprise the drainage and suspended ground floor slab together

with works to existing ground floor slab.

KJV CONSTRUCTION LTD will be working as a PRINCIPAL CONTRACTOR to a

DOMESTIC CLIENT in accordance with CDM 2015.

Temporary works will be required to support the existing ground floor and first floor,

as will temporary works to remove sections of rear façade, whilst new beams are

installed and existing are re-aligned.

Note: The areas requiring temporary works will be refered to within this CMP/MSRA

but the details will be provided by KJV CONSTRUCTION LTD TEMPORARY

WORKS ENGINEER who are HLS LTD. Therefore a detailed MSRA for the

Temporary works will then be issued – No Temporary works to be undertaken until

the Temporary Works Drawings and MSRA have been issued.

The works will be undertaken in accordance with BARTON ENGINEERS -

STRUCTURAL ENGINEERS

2.0 ATTENDANCES BY THE CLIENT

The following attendances will be required from The Client – or will be provided by

KJV CONSTRUCTION LTD as PRINCIPAL CONTRACTOR:

1. Access to the works.


2. Spoil disposal points at reasonable distances from the works. Spoil removal to be

booked in advance.

3. Background/access lighting.

4. 110v power and water supply.

5. Storage areas on site to be agreed on site

6. Liaison with Statutory Authorities.

7. Security of site.

8. Setting out points and level datums.

9. The surveying of ground for existing services and location clearly marked on the

ground.

10. Health, Welfare and First Aid Facilities.

11. WELFARE ARRANGEMENTS – The use of separate Canteen and changing

facilities, contained within Container Units. The Welfare will have Hot running water

and will be regularly maintained.

12. Asbestos Survey Report

13. Any Other Relevant Pre-Construction Information – Including F10 Submission

3.0 SELECTION OF PLANT

KJV CONSTRUCTION LTD will provide all necessary plant to carry out the works.

This will include disc-cutters and wood cutting plant. All operatives using mechanical

plant will have the required training and/or certification. The plant will include all

necessary transport equipment and concrete compaction equipment.

Excavation will be by hand only.

Spoil will be removed via a SKIP loaded by hand and barrow – Subject to SKIP

LICENCE (as per Traffic management)

4.0 METHOD STATEMENT

GENERAL

1. The general process will be as follows:


INTERNAL

Set Up Site

Structural Frame at Roof level

Removal of Chimney Breast

Form opening for spoil/plant access

Temporary Works to Support Ground Floor

Remove Existing basement Floor

Initial Reduce level excavation

Install underpins in accordance with Structural Engineer’s details

Install Lining/Retaining Walls in accordance with Structural Engineer’s details

Temporary works to rear façade opening

Reduce level excavation to formation

Basement drainage

Basement Slab

EXTERNAL – REAR

Set Up Site

Initial Reduce level excavation

Install OPEN Site underpins/retaining walls in accordance with Structural

Engineer’s details

Reduce level excavation to formation

Basement drainage

Basement Slab

Lining Walls as Required

2. The Party Walls to adjoining properties may have been be underpinned by others

under separate contracts, requiring only underpinning to areas not underpinned, or

requiring reduce underpin depth

3. All materials will be transported/handled by Hand and internal hoist

4. Spoil will be removed from site via a SKIP in suspended parking bays outside in the

highway – subject to licence .

5. Materials such as concrete for the, slabs, underpins and beams will be delivered via a

chute or concrete pump directly in from the site compound area.

6. Alternatively concrete will be delivered via bagged materials requiring site batching –

for Non Reinforced elements only

7. The work areas will be surrounded by Movable Barriers which shall maintain the

security of the area both during the working day, including break times, and after

hours. Display appropriate signage.


8. The existing services will be marked clearly by others (i.e. Statutory Authorities)

before the commencement of our works.

9. Copy of our Public Liability insurance has been provided. Cover will be taken for

Public Liability of £10m.

10. The COSHH assessments for materials used on the works will be maintained by our

site foreman.

11. Previous surveys of the site show that the services within the site are generally live so

care will be taken with all excavations, references to existing services drawings will be

made.

12. Dust will be kept to a minimum by means of work methods or dust control measures

such as the use of sprinklers – to be assessed as work proceeds.

13. All personnel will be suitably trained for the tasks that they are to undertake. All

operatives will be Health and Safety trained and CSCS card holders. All plant

operators to have CPCS cards.

14. A copy of our Health and Safety Policy has been issued which gives our organisational

chart for our company.

15. We will be abiding by KJV CONSTRUCTION LTD’s CONSTRUCTION PHASE

PLAN for the Works.

16. We will abide by KJV CONSTRUCTION LTD’s Environmental Plan for the contract

(to be issued). The environmental impact of this project should be minimal but we will

undertake measures to reduce the effects of mud, dust and noise by controlling our

activities and will ensure that all chemicals are stored and used in accordance with our

COSHH assessments and care will be taken to ensure that no chemicals are released

into the ground.

17. KJV CONSTRUCTION LTD – Have production and ENVIRONMENTAL IMPACT

ASSESSMENT and will abide by the control measures as identified to mitigate the

Impact – Issued Separately

18. On arrival on site our operatives will be inducted and informed of the site conditions.

19. Our site foreman will set up barriers around our works and liaise with all site users

regarding movement of plant within the work area and how our works is to be

scheduled with the work of other contractors.

20. MOBILE PHONE POLICY – no mobile phones will be allowed to be used on site, all

operatives to use designated areas to use mobile phones. All operators of safety critical

plant to have mobile telephones switched off when operating the plant.

21. Monitoring of HAND ARM VIBRATION: There will be instances of operatives using

vibrating hand held plant. The site manager will have register of the plant and the


limits of use and will monitor and record in our documentation the use by each

individual operative on a daily basis – these documents will be in line with HSE

requirements and available for inspection.

22. ABRASIVE WHEEL TRAINING: there are operatives trained and appointed by this

company to use abrasive wheels. Should more be required for the duration of the

works then a training course will be held on site by an independent trainer.

23. COMMUNICATION: As required two way radios will be used on site for

management communication and communication with safety critical plant operators

such as concrete pump drivers.

24. CONFINED SPACE/RESCUE PROCEDURES : When working below ground rescue

procedures will be put into place to minimise risk to operatives and ensure that an

operative below ground can be effectively removed to a place of safety. This will be

subject to a separate document to be in placed with the required operatives briefed

prior to commencement.

25. CERTIFICATION: All operative and plant certification will be made available to the

Client prior to commencement on site.

5. ENVIRONMENT MANAGEMENT - SPILLAGES

1. Storage, handling of use of substances must not permit any chemicals to enter the

ground or water courses or drainage and site management will control the site

activities accordingly.

2. Any activities which produce hazardous waste must be suitably risk assessed, and

waste disposed of in an appropriate manner via a specialist contractor.

3. It is the responsibility of the person causing or identifying a problem with deal with it

as soon as possible to reduce any impact and ensure that harm is limited.

4. It is the responsibility of all persons to inform the site management of any spills, leaks

or incidents relating to spillages so that (if necessary) it can be reported to the

Environment Agency

5. FUEL: The fuel will be kept in a bunded tank or kept on a bund of at least 110%.

Fueling will only be allowed in designated areas with spill kits available and fire

fighting equipment. Any spillages will be contained and disposed of as contaminated

material.

6. CONCRETE: Pump wash out will be contained in a bunded area and allowed to set

hard before being broken up and disposed of as concrete. Contaminated water will, if

necessary be pumped into settlement tanks before being allowed to run off.

7. In the event of a spill:


Stem the flow, divert away from drains and watercourses, use suitable PPE (eg.

Gloves, safety goggles).

Surround the spill with absorbent materials (spill kit to be stored in suitable,

close to hand position).

Segregate the absorbent materials used as “special waste” and store in a marked

up container (eg. COSHH bin)

If it is a major incident contact the Environment Agency 24hr hotline on 0800

807060, complete SE form 43.

6 SITE LOGISTICS & TRAFFIC MANAGEMENT WORKS

1. To access the site all materials and spoil will be required to cross the footpath.

2. Therefore at any time there is a requirement to cross the footpath ROAD MARSHALS

will be deployed with the sole aim to protect pedestrian.

3. The vehicles gaining access to the site will be required to unload kerbside in 2no

suspended parking bays directly outside of the property. The length of the two bay

being approximately 12m.

4. The vehicles delivering and removing spoil will be a maximum of 4 axle rigid vehicles

with a maximum length of 9m.

5. The skip lorry to remove spoil will be 2 axle and 6m in length. The skip being placed

on the highway and filled with barrows – Subject to skip licence.

6. The suspended parking bays and the footpath will be washed clean each night.

7. Deliveries and the removal of spoil will be between the hours of 0900-1500 Monday

to Friday only as this is a residential area.

8. The access to the site will be via driving in from ISLINGTON GREEN as per

TRAFFIC ROUTE given below:


9. he Street is shared with others and therefore vehicles movements will be managed

accordingly.

10. No materials or plant will be stored outside the boundary of the site.


11. Materials will be required to unload across the public area. Therefore at any time there

will be a banksman on the road to protect the public and ensure their right of way

when vehicles enter or leave the area.

12. All lorries entering the Road will require a banksman and will be required to contact

the foreman before entering the area. At least operative will guide the vehicle and will

be aware of other vehicles and pedestrians.

13. Only one vehicle will be permitted at a time but if any vehicle does obstruct the Road

an operative will, at all times, be in the Road to warn others.

14. On completion, prior to leaving the area an operative will act as a guide to the vehicle

out of the Road.

15. Around the parking bays barriers will be placed to protect the public.

16. The materials delivered to site will be stored on the space in the site only.

7. NOISE AND VIBRATION CONTROL

1. Vibration will be kept to a minimum by initially detaching the existing structure from

the surrounding structures by means of diamond saw cutting.

2. The Breaking of the concrete slab will cause vibration and will only be undertaken

during times allowed for noisy working in itself will cause any vibration to the

surrounding ground.

3. The existing ground floor slab will be broken up with small breaking plant, mainly

owing to access which will again cause little in the way of vibration to surrounding

structures. Where thick concrete is encountered then larger plant will be required and

will work only during specified times.

4. There may be a requirement under Party Wall Matters for the monitoring of vibration

and therefore we will endeavour to keep to a minimum, as described above, and will

review matters if any complaints arise.

5. Noise will be monitored as sound level meters can easily record the level of sound. All

plant used on the project will be low noise plant with an initial view to prevent the

need for operatives to wear hearing protection on site. As there are surround walls

which will enhance the sound,

6. The aim will be to ensure any sound emitted from the site is less than 80 dbA by

recording the plant noise levels. To achieve this in practice the site entrance doors, will

be kept closed at all times, when not in use.


7. Plant in the compound itself will be baffled or acoustic panels will be used to prevent

noise in excess of 80 dbA being heard outside of the hoarding.

8. ATMOSPHERE/DUST CONTROL

1. Dust will be kept to a minimum by controlling adequately all works that could create

dust.

2. The cutting of concrete will be wet cut and dry cutting of any masonry will also be

prohibited.

3. The majority of works do not create any dust that can affect the public at large, but the

use of the compound and road during dry weather will cause dust from the

construction activity of movement of operatives, plant and materials.

4. To mitigate this general dust a jet wash will be deployed to wash the road and

surrounding site areas at the end of each day and especially during hot or dry weather.

This course of action may also be required during the day.

5. Dust from wood cutting operations will be localised within a cutting area within the

site itself and will have no effect on the public.

6. The plant used within the building will often be diesel operated and will create exhaust

fumes. To prevent a build-up of these fumes extractor fans will be deployed with

exhaust coils to ventilated the area and extract the fumes to a higher level. The place

of extraction will be carefully chosen to ensure that the fumes do not cause any issues

with the surrounding residents.

9 FRONT ACCESS & ENABLING WORKS

1. The front façade is to remain during the underpinning works and therefore will require

an opening formed to enable access for plant and materials. The opening will be

formed using strongboy props to form a 1500 wide opening to the height required for

access to the front lightwell.

2. Internally all of the non-load bearing walls will be removed from basement to ground

floor. Leaving only load bearing walls.

3. The existing basement slab will be broken up using electric breakers or breaker on

mini excavator for loading onto the conveyor.

4. At this stage an initial reduced level excavation can take place to the limit given by the

temporary works engineer before which shoring to the existing foundations is required

– expected to be in the region 300-500mm


5. Externally the ground can be reduced by a 500 approx ensuring that no foundations

are undermined, this operation being undertaken by excavator, the material being

excavated by hand and moved to the front of the building.

6. Internally a conveyor or hoist

10 WORKS TO SUPPORT INTERNAL FIRST FLOOR

1. There is a requirement to insert a new beam at first floor within the joist layout and to

raise existing beams to within the joist layout.

2. This operation will involve the existing joists being supported on a designed

temporary works system – this will be subject to a separate MSRA upon issue of

Temporary Works Drawings.

3. The principle will be to support the joists each side of the beams with adjustable props

with head and sole plates.

4. The joists will then be cut back to allow the beams to be installed at the correct level –

using Geni-Lifts to install the beams.

5. The beams will bear on padstones which will be cut into the brickwork, with

brickwork replace by insitu concrete.

6. The joists will then be re-spliced back into the beams.

11. WORKS TO EXISTING REAR FACADE WALL AND INSTALLATION OF

TEMPORARY WORKS STEELS

1. The REAR FAÇADE has a section removed for access to the rear area, this work

again will be confirmed by Temporary Works Design.

2. The underpins will be installed but to install the temporary steelwork over there will

be a requirement to needle the walls over with SGB TITAN Props and 152UC

Needles.

3. The needles will be installed by breaking pockets in brickwork and installing props

either side as per photograph below:


4. Once installed the walls below can be removed and the steelwork installed. The

steelwork being lifted into position using Genie Lifts and installed onto columns fix to

underpin or pad foundations via Chemical fixed bolts

5. The stability of the structure and the correct installation of temporary works will be the

responsibility of KJV CONSTRUCTION LTD as Principal Contractor’s

TEMPORARY WORKS SUPERVISOR

12 ROOF AREA WORKS

1. The existing roof is to be partially removed by hand to install a new steel frame as per

the Structural Engineer’s plan as below:


2. The steel work is of a relatedly light section to be able to be hoisted within the

building. It will then be erected by hand and GENIE-LIFT.

3. The beams on the party wall will be supported via concrete padstones chased into the

existing party wall.

4. A beam will then be installed between the two main beams to support the chimney

breasts.

5. The temporary works requirements will be to use STRONG-BOY PROPS which will

take the load into the floors below – subject to Temporary Works Design.

6. This will then enable the chimney breasts to be carefully removed via light electric

breakers from top down.

7. The walls will then be made good with the brickwork being faced up flush and

rendered.

13 UNDERPINNING WORKS

1. The Underpin sequence will be in accordance with Structural Engineer’s Drawings

working on a five pin sequence.

2. The principle of underpinning will be the same both internally and externally, the

extent of earthwork support will depend on the depth with underpins up to 1000 in

depth requiring minimal support.


3. In the rear and side area the underpins are open site and therefore are essentially

constructed as buried retaining walls. Where there is no load on these walls they can

be constructed in longer lengths possibly up to 5000 using a trenching method with

vertical trench sheeting – this will require discussion with structural engineer to permit

this type of construction.

4. The first operation will be to form the rear underpins in open site, this will enable

works to proceed to the inside of the building, constructing both areas at the same time

where logistically possible..

5. The works to the rear will also encompass the rear garden boundary walls which will

also be underpinned in accordance with structural engineer’s details.

6. The aim will be to form the underpins as one complete underpin avoiding the need for

undertaking the underpins in two levels.

7. The underpinning is a combination of under the walls and open site depending on wall

conditions. As the wall construction is unknown the underpins will be individually

assessed prior to works commencing, a typical detail is shown below, but this may not

be the same elsewhere.


8. The underpinning principle will remain the same for all conditions once it is known

that the wall is stable, if not the wall will require additional remedial works.

9. The underpinning to Perimeter will be initially underpinned, with only 25% of the

underpins along each wall to ensure stability of the existing wall along area.

10. The underpins will not exceed 1200 in width and will be excavated by hand.

11. Temporary works will be required to support the ground, as excavation under

proceeds, this will be via adjustable props supported on padstones to be in place until

underpin is in place – to be supervised by the foreman,

12. The underpins in general will be cast with a toe either as one or a toe pour first. The

depth of the underpin being in excess of 3000 will require earthwork support by close

sheeting/ring shoring as detailed below.

13. In general the earthwork support will be as per the photographs/sketches below, being

ring shored with timbers or adjustable props at maximum 1200 centre vertically.

14. If the ground within the building is poor quality then horizontal ring shoring will be

deployed as per the photograph below. The trail holes indicate that this should not be

necessary, but equipment to ring shore will be available on site.




15. The ground at the walls will be reduced further to excavate under the walls to install

the underpins which will be undertaken in 1200 bays and in a five pin sequence to

standard underpinning rules.

16. The pins will be excavated by excavator and by hand, with the excavator working to

excavate and remove spoil up to 2000 in depth.

17. Care will be taken to prevent collapse of sides or ground from back of pin. The

ground conditions will be monitored as work proceeds and close sheeting by

excavating in 300 increments will be deployed to prevent any falling in of the ground.

The rear shoring being set to the correct line to prevent over breaking.

18. Then reinforced before being shuttered at the front with plywood and timber (if

reinforcement is required, otherwise mass filled)

19. For all of the walls a 100mm or 75mm kicker will be formed using a timber shutter.

The kickers will be for single sided walls and will have reversed bolts to enable the

base of the shutters to be secured.

20. The wall shutters will be made from timber forms for the non-fair face work with good

one side plywood, fair-face work will be faced with POURFORM plywood to give a

polished finish.

21. The shutters will be purpose made and built up by bolting into the required panels.

The timber shutters will have 150x75 backing timbers.

22. The shutters will be prepared and then lifted into position using an excavator, or may

be made in small panels to man-handled. In general, the outside shutter will be erected

for easier access.

23. The reinforcement will then be installed in the walls against the outside shutter, or the

underpinning itself. The steel fixers will either prefabricate the reinforcement for

lifting in with the excavator or will fix the reinforcement insitu. The steel fixers will

work off of the ground or will work on hop-ups consisting of a mobile scaffold tower

or a safe-stand system.

24. The shutters will be through-bolted into the kicker. The bolting will be at no more than

1000 centres. Stop ends will be formed using timber and plywood.

25. The concrete will be poured into the shutter using a site batch and chute. Access to the

shutters will be either from hop-up brackets attached to the shutter itself, or via a

mobile scaffold tower on the base slab – depending on depth.

26. As the concrete fills the shutter it will be compacted using at least two internal

vibrating pokers, though the use of external pokers will be considered. Special care

and attention will be taken to adequately compact the concrete.

27. The shutters will be removed from the area to be cleaned and prepared for their next

use.


28. The surface of the concrete, as struck, will be spray-cured with an approved non-

staining curing spray.

29. To enable the underpins to work as one they will be doweled and to tie them together

30. The underpins will be cast with Readymixed concrete which will be transported from

the entrance by barrow or via a site concrete pump

31. The concrete will be compacted with internal vibrating pokers.

32. The underpins will be cast to 75 below the existing footings and then will be dry

packed the following day with a cement sand, 1:3 mix. A further 48 hours will be left

before opening the adjacent pins

33. The underpins will be excavated carefully mindful of the close proximity of the

adjoining properties.

34. The works will be closely supervised and where necessary undertaken as a confined

space.

35. Monitoring of the party walls will be undertaken only if deemed necessary.

36. The underpins pits will then be backfilled with compacted selected excavated material

prior to moving to the adjacent pin. The material to be used will be ballast type only

that can be compacted with a plate compactor.

37. The ensure that the concrete does not over-break onto the neighbours side of the

boundary, the excavation will be careful and if required inert fillerboard and foam will

be installed to make up any excess voidage.

14. BASEMENT FORMATION WORKS

1. The excavation will be required to be undertaken in stages so as to ensure the

structural integrity of the underpins, installing the temporary works shoring as the

basement is excavated – to be determined by Temporary Works engineer.

2. The basement within the house has only a shallow excavation as only being lowered,

similarly applying to rear extension.

3. As the excavation to formation proceeds the ground will be excavated a further 50 to

enable a blinding of 50 of concrete to be laid between the toes of the underpins to

maintain integrity of ground.

4. The spoil will be removed by hand on the ground loading out onto the hoist or

conveyors to ground floor level.


5. This work will continue working into the works until all of the spoil is removed and

the blinding is in place.

6. The drainage will be laid by locally cutting out the blinding and laying to falls in a

shingle bed before reinstating the blinding, unless the drainage can be laid within the

steel layers of the basement slab.

7. Then the reinforcement can be installed, loading out by hand from the compound area,

with storage areas provided on site.

8. The concrete will be cast with Readymixed concrete which will be transported from

the entrance by static pump, or via a mobile concrete pump.


10. The concrete will be laid in as few pours as possible using a concrete pump.

14. CONCRETE INTERNAL WALLS & COLUMNS

1. For all of the walls and columns a 100mm or 75mm kicker will be formed using a

timber shutter. The kickers will be for double sided walls and will not require reversed

bolts to enable the base of the shutters to be secured.

2. The wall shutters will be made from timber forms for the non-fair face work with good

one side plywood, fair-face work will be faced with POURFORM plywood to give a

polished finish.

3. The shutters will be purpose made and built up by bolting into the required panels.

The timber shutters will have 150x75 backing timbers and the bolting will be through

150X75 Timbers or RMD SLIMSHORES.

4. The shutters will be prepared and then lifted into position by hand made in small

panels to man-handled. In general, the outside shutter will be erected for easier access.

5. The reinforcement will then be installed in the walls against the outside shutter, or the

underpinning itself. The steel fixers will either prefabricate the reinforcement for

lifting in with the excavator or will fix the reinforcement insitu. The steel fixers will

work off of the ground or will work on hop-ups consisting of a mobile scaffold tower

or a safe-stand system.

6. The shutters will be through-bolted into the kicker. The bolting will be at no more than

1000 centres. Stop ends will be formed using timber and plywood.

7. NOTE: Where pouring against the party wall calculations will be provided to

determine the maximum lift height of concrete to maintain the integrity of the Party

Wall


8. The concrete will be poured into the shutter using a concrete pump or by hand and

chute. Access to the shutters will be either from hop-up brackets attached to the shutter

itself, or via a mobile scaffold tower on the base slab.

9. As the concrete fills the shutter it will be compacted using at least two internal

vibrating pokers, though the use of external pokers will be considered. Special care

and attention will be taken to adequately compact the concrete.

10. The shutters will be removed from the area to be cleaned and prepared for their next

use.

11. The surface of the concrete, as struck, will be spray-cured with an approved non-

staining curing spray.

15. MANHOLE WORKS (Inc PUMP CHAMBERS)

1. The first operation will be to check the likely positions of the manholes and check the

invert depth.

2. The area will be CAT Scanned and the existing services will drawings will be

checked.

3. The barriers will be set up around the likely area and the excavation works will be

undertaken by hand. “NO ACCESS” and “DEEP EXCAVATION” signs to be placed

on the barriers.

4. Hand excavation will generally be used to excavate but manholes in hard areas will

require compressed air tools and disc cutters.

5. On excavation of a manhole the area it will be excavated around to enable there to be

working space to access the manhole.

6. Earthwork support will be boxed out plywood and timber or trench sheets as

excavations are likely not to exceed 1000. If this depth is exceeded the earthwork

support will need to be reassessed before proceeding.

7. The manholes will be entered, from the inside and outside to break out at invert level

to form a new inlet.

8. The flow to the manholes must be blocked off, otherwise confined space measures

will be required.

9. The brickwork and manhole cover works will all be undertaken by hand.

10. The manhole shaft will be protected at all times with a plywood covering to ensure

that nothing falls down the manhole.


11. Works are to take place in the manholes, any manhole over 1500 deep must be

considered as a confined space and only accessed under confined space rules – subject

to separate method statement if required.

12. The manholes will have new pipework existing and built into the benching, or into an

existing inlet (if plastic bases), on completion the manhole base inside and out will be

made good with sand and cement.

13. The Barriers will remain in place until the area is reinstated and left safe for the school

users.

14. The spoil generated will be removed as work proceeds.

15. The HAVS rating of the Breaking equipment will be obtained from the hirer and the

appropriate monitoring and action taken.

16. Once the manholes have been completed the drainage can then be laid away from

them.

16. DRAINAGE WORKS

1. The aim is to pipe away from the existing manholes/pump station within the building

adding in new connections and manhole as required.

2. The new drainage must be first connected into the pump station (if required). This will

require a shaft to be excavated and supported with trench sheeting and struts and then

the manhole can be broken into at high and low level to install new pipes.

3. The drainage trenches will be excavated and shored with trench sheets and adjustable

props excavating between new manholes.

4. Where possible the drainage will be laid at between manholes before backfilling and

reinstating.

5. The drainage will be bedded and surrounded in shingle and then backfilled with

compacted excavated material.

6. The manholes will be constructed as work proceeds.

7. There may be a requirement for the use of compressed air tools to excavate the ground

if it is hard.

7. If ground water is encountered it will be pumped out using a 50 submersible pump.



17. GROUND FLOOR WORKS

1. The suspended ground floor slab will be supported from temporary works.

2. The temporary works will be a designed KWIK-STAGE support system probably on

1200x1200 grid.

3. Onto the KWIK-STAGE, 150X75 primary timbers will be laid at 1200 centres with

100x75 timbers in the opposite direction, with a top surface of 18 Plywood.

4. The rear and side facades will be cut into at centres as per structural engineer’s details

to allow the reinforcement to be installed into pockets. This will enable the concrete to

the slab to do the same as a support to the slab.

5. The mesh and reinforcement will then be laid and spaced off of the soffit.

6. The concrete being placed using a concrete pump and compacted with internal

vibrating pokers.

7. The concrete will be required to cure until reaching design strength before the

temporary works can be removed.


18. PROGRAMME OF WORKS

The works are planned to take place as follows:

Start on site to be agreed as MONDAY 18/08/17 - TBC, for enabling followed by

Groundworks to be undertaken as per KJV CONSTRUCTION LTD’S Programme as

agreed with The Client.

Programme duration for the Basement & Ground Works not to exceed 24 weeks.

It is anticipated that there will be one visit to complete the works.

19. MANAGEMENT STRUCTURE

Our management structure for the undertaking of the above works is to be as

follows:

V EL HOYEK - Director

Telephone No 0208 8087077

Responsible for safety, quality and production.

TBA - Commercial Manager

Mobile Telephone No TBA

Responsible for commercial management of the project.

MALCOLM FURNISS - Visiting Safety Advisor

Mobile Telephone No 07988 629423

C. EL HOYEK - Site Manager


TBA - Site Foreman


Any changes to the above will be conveyed to the client.

It is envisaged that a crew of 6-8 operatives will undertake the work.

The identity of operatives will change throughout the works but all will be inducted on

arrival.


20. HEALTH & SAFETY

Overall control of Health and Safety on site remains with KJV CONSTRUCTION

LTD as PRINCIPAL CONTRACTOR who will be responsible for the specific safety

arrangements and all necessary PPE for our works.

The following hazards have been identified and the risk assessments are as follows:

1. MANUAL HANDLING

2. TAKING DELIVERIES

3. EXISTING SERVICES.

4. WORKING WITH ABRASIVE WHEELS

5. USE OF ELECTRIC BREAKING TOOLS.

6. PROTECTING THE PUBLIC.

7. EXCAVATION WORKS

8. FIXING SHUTTERS

9. CONCRETE WORKS

10. STRIKING SHUTTERS

11. CONVEYING/HOISTING

12. WORK AT HEIGHT

As part of the training of the operatives the site foremen will be issued with a copy of

this document and instructed to impart the information as necessary to the operatives.

Generally this will be undertaken as part of the induction training, which should be

given jointly between ourselves and the client to all operatives prior to commencement

on site. KJV CONSTRUCTION LTD will undertake weekly safety visits to ensure

Method Statement and Risk Assessments are being followed. (Formal recorded safety

visit if required with report for foreman and main contractor)

PPE to be worn:-

Yellow High Vis. Jackets - at all times

Hard Hats - at all times

Protective Boots - at all times

Wellington Boots - when concreting

Goggles - when using Abrasive Wheels and Conc. Pump

Ear Defenders - when undertaking noisy operations (i.e.

using breaking equipment or concrete poker)

Gloves (Rubber) - when concreting

Gloves (Canvas) - when manual handling

Method statement briefings carried out by foremen prior to 0900 induction on the first

day on site. This will require the foremen briefing the operatives and alerting then to

the dangers on the site.

Emergency procedures will be agreed with the Client to enable us to comply with the

procedures laid down in the Health & Safety Plan. These are to be issued to all

operatives as part of the induction process. Our site foreman responsible for carrying

out the requirements.


Risk Assessment Risk Assessment Matrix

KEY

These Risk Assessments to be read in conjunction with Method Statement

and Reassessed accordingly if work methods or site conditions change

Delete and Add as Appropriate

N

o Operation

Those at

Risk Hazards

S = Severity L = Likelihood R = Result

S L R Control Measures S L R

1. Deliveries and

collection

Clearance of spoil

& spillages

Operatives

Other on site

Visitors

Delivery vehicles reversing

onto site across pedestrian

footpath.

4 4 16 Ensure that safety warning

signage is visible and

correctly placed, all

vehicles to be banked

onto/off site with CSCS

banks man in full time

attendance.

4 2 8

2. Excavation Operatives

Other on site

Striking other operatives

whilst lifting

(200kg maximum)

Striking Underground

Services

5

5

4

4

20

20

Follow HSG 47. Refer to

extg services drawings,

CAT Scan area. Use

insulated tools

Shoring of excavation as

per MSRA and Design

5

5

2

2

10

10

3. Moving

Concrete/Spoil

Operatives

Other on site

Manual handling and crush

injuries. Contact with plant

4 4 16 Training of Operatives

correct supervision use in

the main of mechanical

methods. set up and

checked by foreman –

checked weekly under

PUWER

4 2 8

4. Manual handling

of building

materials and

plant.

Operatives

Other on site

Manual handling injury due

to lift or moving of

materials.

3 4 12 Do not lift any materials in

excess of 25ks’s; materials

to be lift in tandem or by

the use of the on-site

hoist/excavator or lorry

mounted crane.

3 2 6

5. Existing services,

working in areas

where services

may be in

existence

Operatives

Other on site

Personal injury to self and

others, damage to services

causing gas, water, electrical

injuries.

5 4 20 All services to be located

and detected and clearly

marked

5 2 10

X 5 4 3 2 1

5 25 20 15 10 5

4 20 16 12 8 4

3 15 12 9 6 3

2 10 8 6 4 2

1 5 4 3 2 1

Project Address: 18 DEVONIA ROAD,

LONDON, N1-8JH

Project No:

Underpinning & Ground

& Structural Works JOB/TASK: Underpinning,

Ground & Concrete Works

X 5 4 3 2 1

5 25 20 15 10 5

4 20 16 12 8 4

3 15 12 9 6 3

2 10 8 6 4 2

1 5 4 3 2 1

Low 1-6 Medium 8-12 High 15-25

Risk Assessment Matrix

SEVERITY LIKELIHOOD

No Injury 1 Almost Never

Minor Injury 2 Seldom

>3 day Injury 3 Possible

Major Injury 4 Probable

Death 5 Frequently


6. Working with

cutting, grinding

abrasive wheels,

cutting trench

sheets or

reinforcement.

Operatives

Other on site

Cutting and or grinding can

cause sparks, possible fires,

eye injuries, burns to

exposed skin, cuts and flying

debris.

4 4 16 Only to be used by trained

operatives, wearing the

correct PPE, issue of hot

works permits and adjacent

fire extinguishers.

4 2 8

7. Use of electrical

tools and

equipment,

breaking, cutting,

lighting,

pumping.

Operatives

Other on site

Electrical injuries, cuts with

use of faulty equipment,

spalling and flying particles,

vibration white finger.

5 4 20 Use of appropriate PPE,

gloves, boots, eye and ear

protection, used by

experienced operatives,

rotate operatives and

regular

monitoring/recording.

5 2 10

8. Protection of the

public,

undertaking

works close to a

public

area/footpath

Operatives

Other on site

Public

Persons entering work area

causing injury, contact with

lifting materials or moving

plant and or deliveries.

4 4 16 Warning signage to be

placed (visible) site

hoardings to be closed at all

times with banks man in

full attendance to

deliveries/moving plant.

4 2 8

9. Underpinning

Operations.

Operatives

Other on site

Collapse of Ground and

trapping of men under

ground

3 4 12 Shoring of ground and

checking by supervisor.

Wearing of the appropriate

PPE, gloves, protective

glasses and long sleeved

shirts.

3 2 6

10. Concreting

works, pouring

concrete with via

a timber chute to

lower levels.

Operatives

Other on site

Splashing from concrete can

cause burns to skin, irritant

to eyes. Noise and vibration

to hands and arms.

4 4 16 Wearing of PPE to cover

eyes with appropriate foot

wear (welly boots) ensures

that clean water and eye

washing is locally

available.

4 2 8

11. Working on

shutters and

installing of edge

protection.

Operatives

Other on site

Falls from height during

concreting, possible

water/concrete can make

working area additionally

slippery.

5 4 20 All open areas to have fixed

barrier with gated entrance,

all access/egress ladders to

be fixed. Regular cleaning

/washing down /sanding of

works area.

5 2 10

12. Loading and

unloading of

deliveries.

Operatives

Other on site

Public

Striking operatives whilst

lifting, falls/falling materials,

slipping and falls from lorry

bed, unsafe/unstable material

loads.

4 3 12 All materials to be checked

upon arrival, where

possible materials to be pre-

slung, lorries to have hand

rails, or slingers to have

harness, fall arrester

attached to excavator/lorry

crane.

4 2 8

14. Temp works to

support steelwork

or concrete

Operatives

Other on site

Personnel injury, property

damage.

4 4 16 Ensure supervised, all

operation at ground level

Work to temp works eng

design

4 2 8

15. Working where

animals may have

been

Operatives

Other on site

Weils disease, anthrax,

tetanus, – Immediately

cease work and contact the

Safety Manager,

Supervisor(s).

3 4 12 Cuts and bruising to be

covered with a suitable

medical dressing prior to

starting work. Ensure PPE

is worn and hygiene

standards are maintained

as instructed by

supervisors.

3 2 6


18. Remove spoil and

spillage from

working area.

Operatives

Other on site

Slips, trips and falls due to

spoil heap in close proximity

of works.

4 3 12 Ensure that the working

area is kept clean by

removing spoil into waste

skips. Wear PPE. If a

waste skip is on the public

highway, ensure it is coned

off and lit at night.

4 2 8

19. Use of

Compressed air

Excavation

Equipment

Operatives and

other on site

Blowing of air lines,

overturning of equipment

Excessive noise

4 3 12 Ensure loads are

proportionate, check

equipment and brace as

necessary

Check equipment daily

Hearing Protection zone to

be established

4 2 8

20. Use of Lifting

Equipment

Operatives and

other on site

Overturning, dropping loads 5 4 20 Ensure competent operators

and LOLER Checks daily

Ensure secured correctly

and checked by competent

person

5 2 10

21. Temp Wks to

underpins and

formwork

Operatives and

other on site

Collapse of Temp works 5 4 20 Ensure installed as per

design – check by TWS and

TWC before loading

5 2 10

Additional Risk Assessments

22.

23.

24.

Assessor Signature :

M.FURNISS, CMIOSH

KJV CONSTRUCTION LTD Health & Safety Manager Date 02/09/17


The following personnel have been instructed on the contents of the works RISK

ASSESSMENTS. They are deemed to have been informed of their role and responsibilities.

NOTE: “DO NOT IMPROVISE. IF IN DOUBT ASK” Any Deviations from this Method

Statement/Risk Assessment to be report to Site Supervisor for Reassessment of Works

18 DEVONIA ROAD, LONDON, N1-8JH

UNDERPINNING, GROUND WORKS & STRUCTURAL WORKS – METHOD

STATEMENT & RISK ASSESSMENTS

By signing below I confirm that I have a clear understanding of the briefing as above

Składając poniżej swój podpis, potwierdzam całkowite zrozumienie powyższych wytycznych

Prin semnarea prezentului document, confirm că am înțeles clar informarea de mai sus.

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