Built centuries ago by the first civilizations, sewer networks have been modernized over time and occupy an important place in our society.
Maintaining, repairing, reinforcing and extending them is vital, especially in large cities with constantly-growing urban populations.
At Soletanche Bachy, we deliver turnkey projects, from foundations to civil engineering works and the construction of sewer infrastructure, in order to meet current and future challenges.
In East London, our colleagues at Bachy Soletanche Limited have constructed part of the world’s largest sewer network: the Lee Tunnel, 6.5km long with five shafts (the largest of which is 41m in diameter, 98m deep and has a 1.8m-thick wall).
Each shaft consists of a diaphragm wall made from reinforced concrete with a secondary layer of fibre-reinforced concrete and a reinforced-concrete base slab. Since its construction, this infrastructure has transported 40% of the wastewater discharged annually into the Thames and considerably improved the quality of the river water.
The main technique used for these structures involved diaphragm walls. This process consists of digging a trench up to 90m deep.