An innovative GBP 36M relining will remediate an essential gravity sewer as it passes above the Jubilee Line, Docklands Light Railway, and Manor Road in West Ham, East London.
Thames Water has appointed Barhale to deliver essential remediation works on the Northern Outfall Sewer (NOS) at Manor Road. The NOS is a 7.5-kilometre-long wastewater asset running across East London that transfers flow from a 300 square kilometre catchment to Beckton Sewage Treatment Works.
The sewer is made up of five separate, parallel sewer barrels: Three were originally constructed by Sir Joseph Bazalgette between 1860 – 1865, and then another two were added around sixty years later. Each existing sewer barrel is 2.7metres in diameter.
Works are constrained by the need to maintain flows through the sewer throughout the programme and to minimise disruption to train travel. Wastewater passes through the pipes at a combined rate of more than 22,000 litres per second – meaning that overpumping is not feasible. Instead, a series of carefully phased isolations will make the work possible. No more than two sewers will be taken out of service at any one time, keeping at least three live at all times.
Once isolated, civil engineering and infrastructure specialist Barhale will strengthen the existing structure with a specially-designed Duplex Stainless Steel pipes.
Barhale’s Senior Contracts Manager Jaimie Lawson explained that the company is working closely with Thames Water to develop a phased approach:
Barhale is working with Thames Water to conduct the design and build project. The new steel pipework for the project has required sourcing from Barhale’s supply chain within the UK for fabrication and materials from suppliers in the EU. Offsite manufacturing of the stainless-steel elements will remove the need for on-site welding and ensure the high levels of quality and precision required are achieved.
