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Bernice breaks through on UK Power Network’s deep cable project

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The tunnel boring machine (TBM) driving UK Power Network’s deep cable tunnel from Brentford Park has successfully completed its drive to the reception shaft at Willesden.

Main contractor J Murphy and Sons said that the 2.59m internal diameter Lovat TBM – named Bernice and launched in July 2012 – completed the 1.27km drive clearing the way for the construction of a new 132kV cable circuit to start to link the substations at Brentford Park and Taylors Lane in Willesden.

“This is a major milestone for our tunnelling team,” said Murphy Tunnelling, Civils and Power managing director Darren Ramsey. “The tunnel has been delivered safely, on time and budget.”

During the drive that was completed through the London Clay at depths of 28m below ground level, the 50t TBM advanced the tunnel by an average of 16m every 10 hour shift and successfully navigated several 70m radius bends.

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