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Drainage & Piped Services Standard Specification
Version 2014-1

Precast Concrete Deep 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.

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

Shafts:

Precast concrete sections: Precast concrete manholes – chamber sections type B;
Precast concrete manholes – shaft sections type B;
and Precast concrete manholes – transition sections.

Jointing and sealing: manufacturers sealed rubber joints

Access components: Access chamber ladders type C and Access chamber steps type E.

Preformed channels and benching:

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

Benching: Integral with base.

Topping: Wearing screed.

Covers:

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

Seating: Precast concrete access cover seatings type E.

Covers and frames: Access covers and frames type F.

Surround: Submit proposals.

Backfill: Submit proposals.

Execution: Installing precast concrete access chambers and shafts for below ground drainage type C; Fixing
steps in below ground drainage monitoring and control systems type F; Jointing precast concrete below
ground drainage access chamber sections type D; Laying conventional channels, branches and benching in
access chambers for below ground drainage type C; Laying preformed plastics channels, 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 H.
System Completion: Removal of debris and cleaning below ground drainage monitoring and control
systems type H; Water testing of manholes and inspection chambers for below ground drainage monitoring
and control systems type H; and Testing of ancillary components in below ground drainage monitoring and
control systems type H.

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
Design: Complete the design of the access chamber system.
Standards: To BS EN 752 and in accordance with National Annex NA; In accordance with Sewers for
adoption; and In accordance with Sewers for Scotland.

Products

Precast concrete manholes – base units type C
Manufacturer: Milton Pipes Ltd or equal and approved
Standards: To BS 5911-3 and BS EN 1917.

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