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Tunnel drive completed on the Lee Tunnel

Tunnel boring machine (TBM) Busy Lizzie has completed her 6.9km long drive on Thames Water’s Lee Tunnel to arrive at Abbey Mills pumping station.

The TBM was launched by the MVB Consortium formed from Morgan Sindall, Vinci Construction Grands Projets and Bachy Soletanche from a shaft at Becton pumping station in January 2012.

The Lee Tunnel will create a new link between the Abbey Mills pumping station and Beckton adding 380,000m³ of storage and prevent 16Mt of sewage entering the River Lee each year during periods of heavy rainfall.

In total 430,000m3 of material has been excavated from the tunnel, which has been lined by 30,000 precast concrete segments, 1.7m long and 350mm wide.

According to MVB, the tunnel is expected to be operational in April 2015 once testing and commissioning has been completed.

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