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Drainage & Piped Services Standard Specification
Version 2014-1

Precast concrete access cover seatings type D
Manufacturer: Milton Pipes Ltd or equal and approved
Standards: To BS 5911-3 and BS EN 1917.
Third party product certification: BSI Kitemark.
Opening sizes: To suit access covers.
Integral accessories: Manufacturer's standard.

Access covers and frames type E
Manufacturer: Submit proposals.
Standard: To BS EN 124.
Form: Double seals and grease, lock bolts; Non-rocking; Recessed covers for concrete filling; Recessed
covers for pavior filling; and Single seal.
Materials: Ductile cast iron.
Finish: Black bitumen painted.
Sizes: Submit proposals.
Loading grades: Submit proposals.
Edging trims: Not required.
Integral accessories: Manufacturer's standard.

Execution

Installing precast concrete access chambers and shafts for below ground drainage type B
Standards: To BS EN 752, and in accordance with relevant parts of the National Annex (NA) and In
accordance with relevant parts of Sewers for Adoption, Northern Ireland.
Base slab thickness: 225 mm.
Chamber dimensions:

Size (nominal internal): Submit proposals.
Depth (cover level to pipeline invert): Submit proposals.
Concrete surround: 150 mm thick.
Backfilling:
Laying fill: Submit proposals.
Compaction: By hand in 100 mm layers.

Jointing precast concrete below ground drainage access chamber sections type C
Inner joint surface: Trim surplus jointing material extruded into chamber and point neatly.

Laying conventional channels, branches and benching in access chambers for below ground drainage type
B

Main channel: Bed solid in 1:3 cement: sand mortar.

Branches:

General: Connect to channel, preferably at half pipe level, so that discharge flows smoothly
in direction of main flow.

Branches greater than nominal size 150 mm: Connect the branch soffit level with the main
drain soffit.

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