CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002 CPM Group Ltd offer a complete range of precast concrete manhole units from DN 900 to DN 4000 in varying depths with tongue and groove joints.

D u c t ile iro nc o v e r & f ra m e

C o v e r s la bA d ju s t in g u n its

D N 1 2 0 0c h a m b e r r in g s

L a rg e d ia m e te rc h a m b e r r in g s

Max

600

0mm

Min

200

0mm

Min

200

0mm

9 0 0 Ø

R e d u c in g s la b

L a n d in g s la b

R o c k e r p ip e

S p ig o t b u tt S o c k e t b u tt F u ll le n g th p ip e

R ig id jo in t R ig id jo in t F le x ib le jo in ts

Units are manufactured and tested in accordance with BS EN 1917: 2002/ BS5911-3:2002. All units are supplied with suitable points for lifting purposes. CPM operate a Manufacturers Quality Assurance scheme in accordance with the European Standard enabling products in the range DN900-3000 to be kitemarked. Note: A constructed precast concrete manhole is a strong, durable structure with its own inherent strength and does not require a concrete surround.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002 Chamber units

Available depth of section

DN 0.25m 0.5m 0.75m 1.0m

Approx wall

thickness

mm

Approx weight /m

depth

kg 900 • • • • 70 530

1050 • • • • 80 710 1200 • • • • 90 912

1350+ − • • • 95 1080 1500 − • • • 105 1330 1800 − • • • 115 1760 2100 − • • • 125 2140 2400 − • • • 140 2740 2700 − • • • 150 3400 3000 − • • • 165 4140

3660+ − − • • 185 5300

Tongue and groove joint

4000+ − − • • 200 6360 +DN 1350,DN 3660 and DN 4000 are not covered by the British Standard (not kitemarked), but comply with all the relevant provisions of the European Standard. DN4000 is supplied in 2 halves. Manhole chamber sections are supplied with nominal 50mm diameter holes for lifting purposes: • 2 Number in DN 1800 & below. • 3 Number in DN 2100 & above. Shaft/chamber sections can be supplied: • with or without fixed double steps. • with holes or cut outs. • with bases cast in

1.

2.

3.

4.

For safety reasons, all chamber sections are loaded and delivered chimney fashion. When offloaded they should never be stored on their side (on the roll), but should always be laid flat. Lorries with crane offload facilities are available for manhole units up to and including DN1500, upon request. Suitable lifting bolts for offloading and handling purposes can be purchased from CPM. These come with appropriate test certificate.

Recommended minimum chamber diameters to suit pipe sizes

Largest Pipe Chamber DN DN

Less than 375 375 - 450 500 - 700 750 - 900

1200 1350 1500 1800

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002

Cover slabs

Standard access sizes Chamber

DN Depth Overall

DN 600x600 675x675 750x750 750x600 1200x675

Weight (kg’s)

6752 access900 150 1060 • C • C X X X 130

1050 150 1230 • E • E • C To order X 235 1200 150 1400 • E • E • C • E To order 355

1350 * 150 1560 • E • E To order • E • C 475 1500 150 1730 • E • E To order • E • C 790 1800 175 2050 • E • E To order • E • E 1210 2100 180 2370 • E • E To order • E • E 1745 2400 180 2700 • E • E To order • E • E 2375 2700 205 3020 • E • E To order • E • E 3335 3000 225 3350 • E • E To order • E • E 4585

3660 * 275 3960 To order • E To order To order To order 7760 4000 * 275 4500 To order • E To order To order To order 10040

* Not Kitemarked Notes: 1. DN900 and 1050 are the only slabs in which a 600x600 access complies with the European Standard. 2. All slabs detailed are Type 2. 3. Weights available on request as they are dependant on the access size. 4. • C denotes central position • E denotes eccentric position

As defined in the British Standard 5. Non standard slabs and accesses can be designed and supplied to order. 6. DN3660 cover slab is supplied in 3 sections. 7. DN4000 cover slabs can be supplied in 2 or 3 sections dependant on the opening required. 8. All accesses have 75 x 75 corner chamfers. 9. All cover slabs are ‘heavy duty’ and are suitable or use in main roads.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002 Special Cover Slabs CPM manufacture a wide range of special cover slabs to customer’s specifications. Typical examples of special cover slabs supplied are;- • Pumping stations incorporating davits and/or

rebates • Extra heavy duty slabs for airports and ports • Extra large accesses • Slabs designed to comply with Highways

Agency Specifications. • Multiple accesses • Non-circular slabs • Slabs with customers own reinforcement

design

Non standardand multiple

accesses can be accommodated

Variousrebate sizes

Penstocks/surfaceboxes

Liftingdavit

sockets

Various slabdiameters/depths

Customer suppliedcast-in products

Non circular slabs also

manufactured

Scottish Water seating slab Special seating slabs 1125 x 1125 x150mm thick, to comply with Scottish Water Services Specification are available with access sizes 6002, 6752, 750 x 600, and 750 x 750.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002 Landing slabs Landing slabs to suit DN 1500 chamber sections and above are manufactured with a 900mm circular access.

Reducing slabs Reducing slabs to suit up to and including DN 4000 chamber sections are generally manufactured with a 900mm, 1050mm or 1200mm circular reducing section.

Reducing slab with fixed step

Cover frame seating rings

Cover frame seating rings are reinforced 65mm deep units which can be used in place of engineering bricks to adjust the ductile or cast iron covers and frames to the required level. Adjusting units are available for the following access sizes. 600 x 600, 675 x 675, 750x600, 1200x675 600 x 600 - eccentric opening to be used in conjunction with a 750 x 600 cover slab opening. The advantages of adjusting units are: • They can be quickly and easily installed by semi-skilled labour • There are fewer joints which reduce the likelihood of infiltration • All concrete manhole units can be ordered from one source • There is a reduced risk of on site damage and pilferage

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002

Manhole steps Polypropylene coated mild steel double steps to BS EN 13101:2004 are fitted to manhole sections when required. Double steps are fixed vertically in line at 250mm vertical spacing. • Polypropylene coated stainless steel steps are available on request. • Manhole sections fitted with double steps can be

used in any depth configuration.

Double steps in chamber section

Integrated manhole ladder system CPM Group Ltd in conjunction with Caswick, the market leading manhole step producer in the UK, have developed an integrated manhole ladder system. This innovative product has been designed to provide safe access and egress to precast concrete manholes, caisson shafts and inspection chambers. The chamber units are delivered already fitted with the ladder rungs. The chamber is then installed in the conventional way, ensuring the rungs align vertically. The units have alignment marks to aid. The stringers can then be readily fitted. The integrated ladder system provides a quick, cost effective and reliable system which is safer to install than conventional ladders. The system has WRC approval and meets the essential requirements of existing and new design codes in terms of dimensions and performance.

Ladder system

Side entry manholes

1250

1000

500

135

Ø1800

Heavy dutycover slab

DoubleSteps

Min 150mm concretesurround to all

fabricated sections

DN 900 - 1200 shaft sections may be fitted to form side entry manholes on sewers of DN 1000 and above. Double steps are available fitted in DN1200 shaft sizes.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002

Soakaway units Standard sections can be perforated with 75mm diameter holes for use as soakaways, providing a minimum area of exfiltration of 50,000mm2 per metre of nominal diameter per metre of depth.

Shaft/chamber section Standard number of perforations per section DN 0.50m deep 0.75m deep 1.00m deep 900

1050 1200 1350 1500 1800 2100 2400 2700 3000 3660 4000

6 8 8 8

10 12 12 14 16 18 - -

9 12 12 12 15 18 18 21 24 27 33 36

12 16 16 16 20 24 24 28 32 36 44 48

Note: DN 1350, DN 3660 and DN 4000 are not covered by the European Standard.

Soakaway Design

Soakaway sections can be installed individually or by combining several together to provide sufficient storage and area of exfiltration. The effective storage capacity should be calculated using the depth of chamber below the invert of the incoming pipe and the base of the chamber or to the top of the water table whichever is the highest. Prior to installing any Soakaway, the proposed location should be investigated thoroughly to ensure soil infiltration, geotechnical and hydrogeology aspects are reviewed and appropriate. BS 8301:1985 recommends in ground with low permeability, the storage capacity should equal 12mm of rainfall over the area to be drained (reference to BRE Digest 365 is recommended). In suitable ground conditions the soakaway can be placed on a ring strip foundation thus providing additional exfiltration through the base of the chamber. If ground heave cannot be ruled out, the units should be sited on a concrete foundation slab. The excavation should be backfilled with a band of 40mm nominal single size stone, stone rejects or hardcore to provide permeable surround to the soakaway chamber. BS 8301:1985 also recommends that soakaways should be constructed not less than approximately 5 metres from a building or in a position where the ground below the foundations is likely to be adversely affected.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002 The following graph is based on the formula:

4Ar h = πD2

Where h = effective depth of soakaway chamber (invert of incoming pipe to base or water table) A = area to be drained (m2).

0

1

3

2

6

5

4

0 200 600400 1000800 1200

Effective depthof chambersection (m)

Area to be drained (m²)

900 1050 1200 1350 15001800

2100

2400

2700

3000

To use graph: 1. Take a vertical line from the “Area to be drained”. 2. Take a horizontal line from the “Effective depth of chamber section”. 3. At the intersection read off diameter of section required. Example Area to be drained = 500m2. Effective depth of chamber section = 3.0m. Intersection falls between 1500mm and 1800mm diameter. Therefore use 1800mm diameter section. If it is considered that 12mm rainfall is insufficient then increase “Area to be drained” accordingly, e.g. 20 minute retention of 50mm per hour rainfall.

500 x 50 = 694 12 x 3

Intersection falls between 1800 and 2100mm diameter. Therefore use 2100mm diameter section.

Alternatively: To calculate the “effective depth of chamber section”: 1. Take a vertical line from the “Area to be drained”. 2. Take the diameter of section. 3. At the intersection read off the “Effective depth of chamber section required”.

CPM Concrete Drainage Systems Manholes BS EN1917:2002 / BS5911-3:2002

Sealants

CPM manholes can be jointed quickly and easily with a rubber bitumen compound or other approved sealant providing a watertight seal without the use of a concrete surround.

Sealant size 12mm x 60mm 12mm x 80mm 12mm x 120mm 12 x 75mm 12 x 25mm

Chamber DN (mm) 900 1050 1200 1350 1500 1800 2100 2400 2700 3000 3660/4000 4000

vertical

Sealant length (per

joint) 3.5m 4.0m 4.5m

5.0m

5.5m 6.5m 7.5m 8.5m 9.5m 10.5m 16.5m 2.5m

Primer 5 litres / 100m 5 litres / 75m 5 litres / 50m -

Note: 1. For rectangular manholes use 12mm x 60mm sealant

CPM Concrete Drainage Systems Rectangular manhole units BS EN1917:2002 / BS5911-3:2002 CPM produce a rectangular manhole unit with a tongue and groove joint, manufactured and tested in accordance with BS EN1917:2002/BS5911-3:2002.

These units comply with the recommendations in the Water Services Association publication Sewers for Adoption 5th Edition, where the manhole from ground level to the soffit of the pipes is 1.45m or less, in light or main road situations.

Palletisation Manhole section

Internal dimensions mm

External dimensions

mm Depth mm

Approx weight

kg No.per pallet

Approx. Weight kg

Top for Metal Cover

Top flange 1200x675 Bottom flange 1200x750 1350 x 900 75 77 5 385

Top for Metal Cover

Top flange 1200x675 Bottom flange 1200x750 1350 x 900 150 141 4 564

Cover (heavy duty) 600x600 access 1380 x 930 150 300 5 1500

Cover (light duty) 600x600 access 1366 x 916 90 150 5 750

Chamber 1200 x 750 1350 x 900 150 115 8 920

Chamber sections can be supplied banded on request.

CPM Concrete Drainage Systems 4m diameter manholes All units are produced and tested where possible in accordance with the relevant provisions of BS EN 1917:2002/BS 5911-3:2002 (but are not kitemarked). The chamber sections are supplied with 50mm diameter holes for lifting purposes, and can be supplied with or without double step rungs. Advantages of system include: • Smooth bore requiring no secondary lining • Fewer joints than a segmental shaft • Less sealant required • Fewer connecting bolts than a segmental shaft • Speedy installation

CPM Concrete Drainage Systems 4m diameter manholes

Chamber section

Wall thickness Approx. weight of half section

Approx. weight of section

when jointed

DN mm kg per m kg per m 4000 200 3180 6360

Chamber sections are supplied with a tongue and groove joint. Lifting bolts for handling and installation purposes can be purchased from CPM Group Ltd. Components 1. Chamber sections supplied in 1.0m and 0.75m depths. 2. Connecting bolts and sealant for both vertical and horizontal joints.

Typical section

CAST IN THREADED SOCKET

STEP RUNGS @ 250VERTICAL CENTRES

3 No LIFTING HOLESPER UNIT

200

2000 RADIUS

3No BOLT BOXES IN 1m DEEP UNITBOXES SET AT 215mm,600mm,855mm

2No BOLT BOXES IN 0.75m DEEP UNIT.

PLAN

ELEVATION

215

BOXES SET AT 215mm,600mm FROM

FROM TOP UNIT.

85

TOP UNIT

110

JOIN

T FACE

CAST IN THREADED SOCKET

75

RUBBER SEAL25X12 BUTYL

110

CONNECTING BOLT 200mm OVERALL25mm DIAM. SHANK 100mm LONG2X24mm DIAM. THREAD 50mm LONG

110 215

29mm DIAM. TUBE

CAST IN M.S. PLATE

172

115

TONGUE19 DEEP

1000

GROOVE10X10 CAULKING

250

LIFTING

74-60 TAPERED

POINT

25 DEEPGROOVE

CPM Concrete Drainage Systems 4m diameter manholes Cover slabs

Heavy duty cover to suit

chamber section

Effective thickness

Overall thickness

Overall diameter

Approx. weight of combined sections

DN mm mm mm kg

4000 260 275 4500 10040

• Heavy duty cover slabs are manufactured in two sections, and can be supplied with a 600mm, 675mm

square or 900mm x 600mm access with chamfered corners. • Each section is provided with suitable lifting points • The cover slabs are designed to withstand 45 units of Type HB loading, applied in accordance with British

Standard 5400 : Part 2 1978. • Cover slabs with special access holes can be supplied, but are made to order. Some special slabs may be

supplied in three sections dependant on the access.

Plan / Section

50x12 SEALANT

135140

DETAIL A

135140

275

TYPICAL ACCESS

4500 OD TOP / 4490 OD BOTTOM

DETAIL A

SECTION

PLAN

100

CPM Concrete Drainage Systems 4m diameter manholes

A

Components

1. Ensure the contents of each load are carefully checked against the delivery note.

2. The connecting bolts, nuts and washers should be stored in a secure area until required.

3. The boxes of Butyl sealant should be stored in a dry secure area until required. Each horizontal joint requires approximately three boxes and each 1m vertical joint requires approximately one quarter of a box.

B.

Lifting

1. Ensure suitable craneage and lifting attachments are available for offloading and placing of shaft. It is recommended that a full circle slew type machine is used for handling, jointing and positioning shaft sections.

A three legged chain of minimum 3 metre length must be used. 2. Each 1m chamber section weighs approximately 3.18 tonnes. The

combined weight of the unit when jointed being 6.36 tonnes.

C.

Procedure

1. 2. 3. 4.

The principal of the system is to joint two half sections of chamber ring at ground level, and then lower the complete unit into the prepared shaft. Ensure a safe working area of approximately 6 square metres is designated for jointing the sections away from the shaft and that the ground is level. Lower the first half section on to timber bearers, ensuring the bearers at the vertical joint faces are set back to allow access for a minimum of 50mm overlap to top and bottom of the horizontal joint faces when placing the 25mm x 12mm Butyl sealant. Screw the connecting bolts into the cast in threaded sockets provided on the vertical joint faces. Place the 25mm x 12mm Butyl sealant, as supplied by CPM, along the vertical groove provided, allowing approximately 50mm overlap to the horizontal joints both top and bottom.

CPM Concrete Drainage Systems 4m diameter manholes

5. Lower the second half section and offer up to the first section on bearers allowing the connecting bolts to enter the bolt boxes provided on the vertical faces.

6. Utilising the central 24mm diameter threaded socket provided in each half section use a Trifor and winch the two together with the second half section being supported by the crane.

7. Use washers and nuts to tighten the connecting bolts through the bolt boxes. Do NOT over-tighten.

8. Place bearers under second section having jointed the two halves together. Ensuring the connecting bolts are tight, release the lifting chains.

9. Place the 75mm x 12mm Butyl sealant, supplied by CPM around the locating groove of the horizontal joint and over the 50mm overlap from the vertical face.

10. Utilising three of the six 50mm diameter lifting holes provided when the setions are jointed insert bolts and connect lifting chains. Lift as complete unit and lower into shaft.

11 Repeat the above process for additional units to be placed, but ensure the subsequent units are turned through 90 degrees when lowering into the shaft, thereby staggering the vertical joints.

12. Caulking grooves are provided at the inside edges of every vertical and horizontal face to allow for the provision of additional sealant if required.

13. The Butyl sealant can be used on the base joint and the top joint of the cover slab for sealing purposes.

14. The cover slab is supplied in two sections. 25mm x 12mm Butyl sealant can be used on the rebated lip of the sections prior to placement to provide a watertight seal.

15. In the case of deep shafts or where a high water table exists it is recommended that a secondary sealant be used to ensure water tightness at the joints. e.g. Hydrophilic material