AMEC wins £28m Thames Water contract

News

Thames Water has awarded AMEC a £28m contract to construct a 4.5km tunnel to connect a water treatment works to the London Ring Main and help ensure security of water supply.

The 2.85m diameter concrete-lined tunnel will run from an existing shaft at Thames Water's reservoir site in Stoke Newington and join the Ring Main at the New River Head pumping station, Finsbury.

AMEC's engineers will have to deal with varying ground conditions, ranging from London clay to Thanet sands using a Lovat earth-balance tunnel boring machine (TBM). They will tunnel under Highbury and Islington, crossing under six London Underground tunnels, five Network Rail tunnels, a canal tunnel and two major sewers.

In addition to the tunnelling work, the contract involves a mechanical, electrical, instrumentation and communications upgrade and the sinking of two 50m deep launch and reception shafts for the TBM.

Detailed design begins immediately with work on site scheduled to start in July this year. Completion is planned for spring 2010.

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