Thames Water Lee Tunnel Pumping Station Shaft
Morgan Sindall Underground Professional Services
London, United Kingdom
Images: © Andras Nemeth
As part of the Lee Tunnel project, a major enhancement of the London sewer system, the Beckton Pumping Shaft is the largest shaft on the project some 38m in diameter and 80m deep – enabling the pumping of effluent from the Lee tunnel itself. Substantial design innovation, in the structural concept of mobilising the composite action between an inner steel fibre concrete liner and external diaphragm walls, led to significant reductions in materials, cost, programme and risk.
The structural engineers developed a new method of internally lining deep shafts using a steel fibre reinforced slipformed “chimney”. This design innovation, which has been carefully verified by full scale testing, offered benefits to the project as a whole.