CMP worked for Vinci Construction UK on behalf of Taylor Woodrow to install two large temporary sheet pile double skin marine cofferdams. The cofferdams spanned across the existing dock passage between the Victoria and Albert Docks near London’s Excel Centre. The work was to enable the dock passage to be de-watered and permit access for the reconstruction of the Connaught Tunnels as part of the London Crossrail project.
The project began in November 2012 with removal of underwater obstructions with specialist dredging and breaking equipment. Long reach excavators worked from barges to break the concrete where the temporary pile line was required. Piling rigs were loaded onto the barges for the construction of the sheet pile cofferdams. This part of the project required careful planning and execution to enable the piling rigs to work under the flight path of the nearby London City Airport. Special methods and flexible working patterns were developed by the CMP team to allow piling safely under the flight path.
Following completion of the piling, the project required an intensive programme of diving to install the underwater cofferdam waling, ties and huge props to span between the dock walls. Finally, before de-watering could commence, both cofferdams had to be filled with 14,000 tonnes of granular fill material. Upon completion of the tunnel works (by Vinci), the previously installed temporary cofferdams were successfully removed.
The project was successfully completed during a demanding part of the Crossrail construction phase and the programme was met to enable the dock passage to be re-opened in time for an important project milestone to be achieved. This project is a great example of combined marine expertise applied in the demanding London civil engineering market.
Connaught Tunnel Entry Cofferdams
April 30, 2013