As the demand for high loading and multi access cover slabs has risen, Marshalls CPM have become experts at both design and manufacture, bringing together the expertise of the Technical Department and those in production.

Marshalls CPM have manufactured extra-large heavy duty cover slabs for airports and seaports as well as those designed to comply with the Highways Agency Specifications and concrete slabs to customers’ own reinforcement design

If you require this, please call our technical team on 01902 356220 who will be able to help with AutoCAD design and drawings, calculations and installation advice and all design work is fully supported by professional indemnity insurance for peace of mind.

Large Circular Chambers (manhole or segment construction)

Marshalls CPM produce large circular chambers for manhole or segmental construction, manufacturing precast concrete chamber rings up to 3000mm that comply with BS EN 1917:2002 and BS 5911-3:2002, as well as 3660mm and 4000mm diameter which are not covered by the British Standard but comply with all the relevant provisions of the British Standard and Eurocodes.

To go with these Marshalls CPM produce a variety of cover slabs with a standard access that complies with the British Standard as well as a variety of special accesses manufactured to customers’ requirements.

These can either be in a one piece cover slab or a segmental depending on the diameter and whilst they are not covered by the British Standard our qualified engineers in the technical team at are on hand to give advice with design and installation.

Typical examples of special cover slabs supplied are:
  • Slabs up to 15 metre diameter
  • For pumping stations incorporating davits, rebates and surface boxes
  • Extra heavy duty slabs for airports and ports
  • Extra large accesses
  • Slabs designed to comply with Highways Agency Specifications
  • Multiple accesses
  • Slabs with customer’s own reinforcement design

Click on the images below to view the image gallery.

Got a question?

To find out more about Special Cover Slabs, please call our Technical Office or fill out the enquiry form and we’ll get back to you within 24 hours.

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