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/integrated ladder system.

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

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

Cover slab

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 generally manufactured in two sections, and can be supplied with a 600mm square, 675mm square or 900mm x 600mm accesses 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.
• 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/es.

Plan / Section

		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
		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.
	1.	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.
	2.	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.
	3.	Screw the connecting bolts into the cast in threaded sockets  provided on the vertical joint faces.
	4.	Place the 25mm x 12mm Butyl sealant, as supplied by CPM, along the vertical groove provided, allowing approximately 50mm
	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 throughthe 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.

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