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Donegan Civil Engineering

Westminster Road, Macclesfield

Construction of an access chamber onto an existing brick culvert to provide an outfall for surface water

By: Valentine Donegan

Published: November 18, 2025

Westminster Road, Macclesfield

Client: Quinn Civils for Bellway Homes
Value: £135,000

Project Description / Main Operations

V J Donegan & Co Ltd was contracted to build an access chamber onto an existing brick culvert to provide an outfall for surface water from a new large housing development for Bellway Homes, with limited tender information on the ground conditions and location of the existing culvert, which was some 13m deep.

Scope and method:

Turnkey package, including ground investigation works.
Survey works of the 600 dia deep culvert to establish an accurate line and level.
Liaison with United Utilities to gain statutory permission for the works.
With all investigations and approvals to be completed within a tight 6-week programme to allow the main works to be undertaken during the school holidays.
Construction of a 3.6m dia caisson shaft to a depth of approx. 13m onto the centre of the 600mm pipework.
Stabilising of the 600mm brickwork culvert in order to complete benching works.
Installation of a 10m height 250mm ductile iron backdrop pipe to take the flows from the new surface water sewers into the outfall culvert.
Cover slab installation, carriageway reinstatement and surfacing.
Installation of a GRP access ladder complete with intermediate landing platforms.

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