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Lee Tunnel
The Lee Tunnel also known as the East Ham to Stratford deep tunnel, is a tunnel for storage and conveyance of sewage mixed with rainwater. The tunnel is part of the Thames Tideway Scheme and runs from Abbey Mills Pumping Station down to Beckton Sewage Treatment Works under the London Borough of Newham.
This long tunnel, diameter , running from deep at Abbey Mills down to deep at its terminus at Jenkins Lane, East Ham, will capture , or 16 million tonnes, of sewage annually from the single largest polluting CSO in London. This sewage would otherwise flow straight into the River Lea, the Thames Tideway and eventually the Thames Estuary. However, the sewage will now be pumped up to the Beckton Sewage Treatment Works - the largest sewage treatment works in Europe - and the resultant clean water will be emptied into the River Thames. The reason for starting at -75m is to be ready to collect sewage from the lowest point of the Thames Tideway Tunnel, which is yet to be built but is intended to connect.
Thames Water awarded the construction contract to the MVB JV consortium, comprising Morgan Sindall, VINCI Construction Grands Projets and Bachy Soletanche, in January 2010. The cost is an estimated £635 million.
The construction of the tunnel began with sinking of vertical shafts in 2010. In February 2012, the TBM, built by Herrenknecht and named Busy Lizzie, started work at the Beckton end. In 2013, a UK record concrete slipform pour was achieved, with 29 days of continual pouring. The tunnel is the deepest tunnel ever bored in London, exceeding the Crossrail excavations.〔 The TBM reached Abbey Mills in January 2014. The remaining work is expected to be completed during 2015-16.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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