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Drainage & Piped Services Standard Specification
Version 2014-1
Precast Concrete Shallow Inspection Chamber System for Below Ground Drainage
System Performance: Design of access chambers for below ground drainage system
System manufacturer: Milton Pipes Ltd
Base slabs: Precast concrete integral with first shaft ring.
Shafts:
Precast concrete sections: Precast concrete inspection chambers – chamber sections.
Jointing and sealing: Manufacturers sealed rubber joints
Preformed channels and benching:
Preformed channels: Plastics channels for access chambers type C and Vitrified clay channels
for access chambers type C.
Benching: Designated concretes for drainage applications type O.
Topping: Wearing screed
Access components: Access chamber steps type F.
Covers:
Cover slabs: Precast concrete inspection chambers – cover slabs.
Seating: Class B engineering
Covers and frames: Submit proposals.
Surround: Designated concretes for drainage applications type P.
Backfill: Submit proposals.
Execution: Installing precast concrete shallow access chambers for below ground drainage type B; Fixing
steps in below ground drainage monitoring and control systems type D; Jointing precast concrete below
ground drainage access chamber sections type B; Laying conventional channels, branches and benching in
access chambers for below ground drainage type A; Laying preformed plastics channels, branches and
benching in access chambers for below ground drainage type B; and Laying sealed access fittings, branches
and benching in access chambers for below ground drainage type B.
System Completion: Removal of debris and cleaning below ground drainage monitoring and control
systems type F; Water testing of manholes and inspection chambers for below ground drainage monitoring
and control systems type F; Testing of ancillary components in below ground drainage monitoring and
control systems type F; and Documentation type F.
Products
Precast concrete inspection chambers – chamber sections
Manufacturer: Milton Pipes ltd or equal and approved
Standards: To BS 5911-4 and BS EN 1917.
Third party product certification: BSI Kitemark.
Cement type and content: Manufacturer's standard.
Form: Circular and Rectangular.
Sizes: Submit proposals.
Integral accessories: Galvanized steel lifting rings and Steps.
Plastics channels for access chambers type C
Manufacturer: Polypipe Terrain or equal and approved
Material and standard: PVC-U to BS EN 1401-1.
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