Technical data
Project description
Construction of a sewage tunnel.
- Length: 6,950 m
- Inner diameter: 7.10 m
- Outer diameter: 7.80 m
- 7 shafts
Construction method
- TBM tunnelling with earth pressure shield
- Shield diameter: 8.13 m
- The tunnel is lined with 8 trapezoidal segments per ring, 350 mm thick, 1.70 m wide
Geology
- London Clay
General data
Project
Thames Tideway Tunnel,
Lot C405, Tideway West
Sewerage Tunnel, London,
Great Britain
Client
Tideway (Bazalgette Tunnel Limited), London, Great Britain
Contractor
Wayss & Freytag Ingenieurbau AG in joint venture
Construction period
2015 to 2021
Net construction sum
416 million GBP
Improving water quality
To improve water quality, London's water and wastewater company, Thames Water, is investing in a three-stage expansion of its wastewater system.
From 2023, the Thames Tideway Tunnel will collect wastewater from 34 of London's largest discharge points over a length of 25 kilometres, dam it and discharge it into the Lee Tunnel. The main tunnel, with an internal diameter of up to 7.2 m, will start at a depth of around 30 m in Acton, run eastwards through central London beneath the Thames and end at a depth of around 70 m at the Lee Tunnel in the Abbey Mills pumping station.
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