Award-winning Civil and Structural Engineers

Home Projects Detention Tank Blackburn WWTW

Detention Tank Blackburn WWTW

Active Tunnelling was employed as a specialist contractor to construct a 27m diameter shaft, 24m deep to resolve the unsatisfactory intermittent discharge located at the Blackburn Waste Water Treatment Works.

The concrete base to the shaft was cast incorporating 106 ground anchors and 915m³ of concrete. A central flushing column was then constructed 22m tall utilising a ‘self-climbing’ formwork system.

Active Tunnelling achieved consistently high marks at the regular Health & Safety and Environmental audits.


  • Design of ‘self climbing’ formwork system


United Utilities Plc


Active Tunnelling Ltd

Project Description

Design of ‘self climbing’ formwork system for a 24m deep detention tank.

Related projects