CPM Perfect Manhole
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CPM is a market-leading manufacturer of precast concrete products with extensive production facilities across the UK. This, combined with a network of specialist distributors, enables us to provide our customers with complete UK coverage. Our business is built on a solid reputation for delivering quality products and providing a first class service. We supply a vast range of sustainable precast products to every sector of the construction industry, fully supported by our experienced technical and engineering teams. The Company’s comprehensive catalogue of products is enhanced by its...

Welcome to CPM Group / Product Index Perfect Manhole System / Time Line / Attributes Advantages / The Perfect Manhole System The Perfect Manhole System and Drawings The Perfect Manhole System / 1800 / Images The Perfect Manhole System / Installation Guide

The Perfect Manhole System After an extensive research programme, CPM introduced the 1200mm Perfect Manhole system in October 2009 to meet the challenges of modern day construction. Today it is available in 1200mm, 1500mm and 1800mm diameters and comprises of a monolithic precast concrete base (available pre-benched in any configuration within just days of requisition), a sealed chamber ring (with a thicker wall than a traditional ring), a rubber joint (so no tokstrip or similar product is required) and a sealed cover slab (supplied with your required access). For other sizes please...

Attributes of the Perfect Manhole System Build Greener Up to 40% lower greenhouse gas emissions Build Leaner Saves material and labour / No waste Build Faster Speedy installation Build Safer No confined space working, excavation closed quicker Build Quality CPM’s Perfect Manhole is produced in a quality controlled factory environment Quality of the Perfect Manhole System Perfect Manhole complies with BSEN1917:2002 and BS5911-3. CPM’s Perfect Manhole is accepted for use by all major UK companies and is included in Sewers for Adoption 7th edition. The long term benefits CPM’s Perfect Manhole...

Advantages / Perfect Manhole System Safer construction No requirement to form a concrete surround. Reduction of open excavation. GHG savings Up to 40% savings on GHG emissions compared with traditional construction. Fast installation The modular solution eliminates the need for wet trades resulting in rapid construction compared to conventional methods. No need to surround in concrete unless specifically required 130mm wall thickness. Available at short notice Our modern methods of production enables just in time delivery of all components including bases at short notice. Watertight The...

Efficient construction Available in varying depths for efficient construction. Base options Available pre-benched or plain bottom with or without inlet / outlets. Pre-fit options Hydro-Brake®, penstocks, non-return valves, and filters can be pre-fitted in the factory. Customer choice The perfect manhole is available with or without double steps. Sealed chamber rings can be used without the perfect base. Cover choice. Each perfect manhole is available with a cover slab opening of 600 x 600mm, 675 x 675mm, 750 x 600mm or 1200 x 675mm Extra Services Full take-off service available. Lifting...

Perfect Manhole / Diagrams Product Reference Customers MH Ref Required fall across main channel (E1 To A0) Double steps position if Required (DEG) Outlet / Inlet Postions (DEG) Pipe Size Pipe Type Outlet - A0 Inlet - E1 Inlet - E2 Inlet - E3 Inlet - E4 A A Please use this diagram to scan/photocopy and forward your requirements to perfect@cpm-group.com Please note that there is a 1 in 9 gradient for the 1200mm perfect manhole and a 1 in 18 gradient for pipes 450mm upwards for the 1500mm perfect manhole and the angles between adjacent connection cannot be less than 24 degrees.

Perfect Manhole Dimensions / 1200mm 1200mm Standard Base Unit Dimensions 1200mm chambers have a nominal fall of 20mm +/- 10mm north to south across the major incoming to outgoing inlets. G=Wall Thickness. Please note that all weights and measures are approximate.

Perfect Manhole Dimensions / 1500mm Typical Perfect Manhole Images

1500mm chambers have a nominal fall of 25mm +10mm/-13mm north to south across the major incoming to outgoing inlets. G=Wall Thickness. Please note that all weights and measures are approximate.

Perfect Manhole System / 1800mm After the successful introduction of the 1200mm and 1500mm perfect manhole system, CPM has developed an 1800mm sealed manhole that can be used for precast concrete pipes up to 900mm diameter. The system includes a cast-in base and incorporates the concrete butt pipes into the chamber base and pipe channel; this only leaves the benching to be completed on site. By leaving the benching out of the base element, the weight of the unit is reduced to between 5.0 and 5.5 tonnes depending upon the configuration. Deeper manholes are accommodated by using a reducing...

Perfect Manhole / Rings Perfect Manhole Ring / Typical Weights 1200 Dimensions / mm Perfect Manhole / Cover Slabs Perfect Manhole Cover Slab / Typical Weights Dimensions Please note that all weights and measures are approximate.

CPM Perfect Installation Guide Introduction This guide offers advice on how to install the CPM Perfect Manhole system incorporating a load bearing elastomeric seal known as a ‘sealed manhole’ system. The system provides a manhole whereby all joints and connections have elastomeric seals enabling a watertight manhole to be constructed quickly and easily with the minimum of site work. Manholes are consequently installed in a similar manner to pipes requiring a different technique to traditional manhole construction. The wall thickness being over 125mm means that the installed manhole does not...

Shaft Units Shaft unit with spigot and socket joint with the seal fitted Units can be supplied with or without double steps The Integrated ladder system is also available with the sealed manhole system. Load Distributor Forsheda F-171 1180 x 24.4 Manufactured to BS EN 681-1 type WC Actual size is dependant on manhole diameter. Joint Seal Elastomeric Seal Cover Slab Drawings In a 1500mm diameter, the cover slab maybe supplied with an integral 250mm shaft to obtain the correct overall height