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Drainage & Piped Services Standard Specification
Version 2014-1

Installing precast concrete shallow access chambers for below ground drainage type A
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 Scotland. 2nd edition.
Base slab thickness: Submit proposals.
Chamber dimensions:

Size (nominal internal): 1050 mm diameter and 1200 mm diameter.
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.

Installing vortex flow control units in access chambers for below ground drainage type B
Cast in place mounting block profile: Rise from manhole base vertically to provide plane surface for
attachment of unit.
Outlet pipe: Build in.
Drain down secondary outlet pipe: Build in.

Fixing steps in below ground drainage monitoring and control systems type C
Fixing: Secure to chamber wall.
Positioning: 300 mm vertical centres staggered 300 mm horizontally, with lowest step 300 mm (maximum)
above benching and top step 450 mm (maximum) below top of cover.

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

Installing access covers and frames to chambers for below ground drainage type F
Bedding and haunching of frames: Top of haunching 30 mm below surrounding surfaces.
Vertical positioning of frames: Level or marry in with levels of surrounding surfaces.
Permissible deviation in level of external covers and frames: +0 to -6 mm.

Installing precast concrete access chambers and shafts for below ground drainage type A
Standards: To BS EN 752, and in accordance with relevant parts of the National Annex (NA); In accordance
with relevant parts of Sewers for adoption; In accordance with relevant parts of Sewers for Adoption,
Northern Ireland; and In accordance with relevant parts of Sewers for Scotland.
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.

System Completion 3 / 45

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