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Drainage & Piped Services Standard Specification
Version 2014-1

Precast Concrete Manhole System for Below Ground Drainage

System Performance: Design of access chambers for below ground drainage type The chamber is to be
suitably sized and accessible to be used a sampling point.

System manufacturer: Milton Pipes Ltd or equal and approved

Base slabs: Precast concrete manholes – base units type B.

Shafts:

Precast concrete sections: Precast concrete manholes – shaft sections type A.

Jointing and sealing: Manufacturers sealed rubber joints

Preformed channels and benching:

Preformed channels: Vitrified clay channels for access chambers type D.

Benching: Integral with base.

Topping: Wearing screed

Access components: Access chamber ladders type B and Access chamber steps type D.

Covers:

Cover slabs: Precast concrete manholes and soakaways – cover slabs type B.

Seating: Precast concrete access cover seatings type D.

Covers and frames: Access covers and frames type E.

Surround: Submit proposals.

Backfill: Submit proposals.

Execution: Installing precast concrete access chambers and shafts for below ground drainage type B; Fixing
steps in below ground drainage monitoring and control systems type E; Jointing precast concrete below
ground drainage access chamber sections type C; Laying conventional channels, branches and benching in
access chambers for below ground drainage type B; Laying sealed access fittings, branches and benching in
access chambers for below ground drainage type C; and Installing access covers and frames to chambers for
below ground drainage type G.
System Completion: Removal of debris and cleaning below ground drainage monitoring and control
systems type G; Water testing of manholes and inspection chambers for below ground drainage monitoring
and control systems type G; Testing of ancillary components in below ground drainage monitoring and
control systems type G; and Documentation type G.

Products

Precast concrete manholes – base units type B

Manufacturer: Milton Pipes Ltd or equal and approved

Standards: To BS 5911-3 and BS EN 1917.

Third party product certification: BSI Kitemark.

Concrete quality: Submit proposals.

Cement type and content: Submit proposals.

Sizes (nominal): Submit proposals.

Preformed channels and benching: Submit proposals.

Integral accessories: Galvanized steel lifting rings;
Ladders;
and Steps.

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