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MottMcDonald

Annual review 2022

Revitalising London’s River Thames
Future-ready cities for south-east Asia

Revitalising London’s River Thames

Tideway is the largest project underway in the UK water industry, with few others worldwide that match its size and complexity. With overflow sewage from London’s 150-year-old sewers regularly polluting and threatening the health of the River Thames, a £4.4bn programme is delivering a new super sewer to capture these flows and clean up the city’s main waterway. Along with a 25km-long tunnel, a complex network of underground structures has been designed. A multidisciplinary team, drawing on technical expertise from across our business, has taken a sustainability-focused approach to designing the main permanent structures for the eastern portion of this massive infrastructure project. “These are enormous pieces of engineering, as the volume of water that will move through this system is that of a decent sized river,” says Nick Dobson, our design lead for structures. One of our many contributions was at Greenwich, where the contractor, a Costain/Vinci/Bachy joint venture, is connecting into the side of a 10m-deep chamber that was built more than a century ago. With only archive records available, the key to success was digital coordination, using 3D scans and a cloud of data points to make a virtual model. The team designed a solution, sustainably combining the old and the new, to strengthen the existing chamber while also providing a fixture and support into the new chamber for stability. What’s more, the design accommodated the ongoing operation of the existing sewer chamber. On parts of the work, the team was able to cut the amount of concrete needed by 20% – equating to about 4500t of embodied carbon saved.

Tideway is the largest project underway in the UK water industry, with few others worldwide that match its size and complexity. With overflow sewage from London’s 150-year-old sewers regularly polluting and threatening the health of the River Thames, a £4.4bn programme is delivering a new super sewer to capture these flows and clean up the city’s main waterway.

Along with a 25km-long tunnel, a complex network of underground structures has been designed. A multidisciplinary team, drawing on technical expertise from across our business, has taken a sustainability-focused approach to designing the main permanent structures for the eastern portion of this massive infrastructure project. “These are enormous pieces of engineering, as the volume of water that will move through this system is that of a decent sized river,” says Nick Dobson, our design lead for structures....

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Project summary

Project

Tideway

Client

Our client: Costain, VINCI Construction Grands Projets, Bachy Soletanche joint venture (CVB)
Overall client: Tideway

Location

London, UK

Expertise

Design, structural engineering, M&E, tunnelling

25km

tunnel

4500t

embodied carbon saved at Greenwich

Chris Lile

Find out how we can work together

Chris Lile

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MottMcDonald

Annual review 2022

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