The UnPS-designed, seven metre diameter Lee Tunnel runs for 6.9 kilometres from Abbey Mills Pumping Station to Beckton Sewage Treatment Works.
In addition to featuring the world’s largest Steel Fibre Reinforced segmental lining, the project involved three of the largest continuous concrete pours ever undertaken in the UK, for the base slab (5,000m3), shaft lining (11,000m3) and slipformed central wall (7,200m3). This was recognised by Thames Water’s ‘Health and Safety in Planning and Design 2014’ award, and commendation at the IStructE Structural Awards 2014.
We also designed the award-winning Lee Tunnel Pumping Station, one of the largest underground structures of its type in the world and one of the most important strategic infrastructure assets in the UK. By taking a holistic approach to its design and construction methodology, we delivered enhancements in safety and buildability, plus cost and time savings, whilst improving long-term structural durability.