Barhale has been awarded the main £9 million civil engineering subcontract on the Thames Tideway Tunnel sewer project by the BAM Nuttall-Morgan Sindall-Balfour Beatty joint venture.

The contract will see the West Putney storm relief combined sewer overflow (CSO) intercepted at Barn Elms by constructing a series of complex underground structures connecting it to the main Thames Tideway Tunnel beneath the River Thames.

The civil engineering and infrastructure specialist has already started work at the Barn Elms Sports Centre site in Richmond earlier this month - the contract is due for completion in two years.

The 35-metre deep CSO drop shaft formed with a sprayed concrete primary lining and six-metre internal diameter (ID) secondary lining will convey the storm flows from the existing CSO down though a vortex generator and a drop tube to the connection tunnel, which will be constructed by a 2.5 x 215 metre pipe jack finished with a 2.2-metre ID secondary lining.

Barhale contracts manager Ovi Frunza commented:

“This is a very exciting and important project for Barhale.  It’s a challenging piece of work but with our experience in this sector we are confident that our input to the Thames Tideway Tunnel will help ensure its aim of reducing sewage overflows into the River Thames.”

The BAM Nuttall/Morgan Sindall/Balfour Beatty joint venture is delivering the west section of the 25km Thames Tideway Tunnel.

Barhale is now working on all the three sections of the project and also the Thames Tunnel system modification works at Beckton sewage treatment works in East London that will support the overall Thames Tideway Tunnel project.