Another major section of the contract involved the construction of a diaphragm wall shaft to form the Greenwich Rotation Chamber, which enabled the reception and rotation of the TBM (tunnel boring machine) after it completed its southbound drive of the tunnel. To facilitate the safe manoeuvring of the TBM, Bachy Soletanche installed unreinforced CFA piles outside the shaft to strengthen and reduce the permeability of the river terrace deposits.
Further to this, Bachy Soletanche installed CFA piles for the Millennium Way Temporary Bridge, the Control Building, a new footbridge and several gantries, as well as cased CFA piles for the Open Cut Temporary Utilities Bridge.
At its peak, the demanding programme required 24-hour working and saw five rigs operating simultaneously.
Bachy Soletanche’s operations manager, Martin Stanley, commented,
“Thanks to our team’s multi-disciplinary skill set and experience, we were able to respond well to the evolving programme and technical requirements throughout the project.
“Our experience of working in joint venture partnerships on other major infrastructure schemes in London, such as the Thames Tideway Tunnel and Crossrail, was essential in allowing us to support Riverlinx with specialist requirements, such as acquiring consents.”