Crossrail C315 Connaught Tunnel

Crossrail C315 Connaught Tunnel

Contract C315 was a technically challenging project that was very unusual for a major new transport scheme such as Crossrail - it was nearly all about the refurbishment of Victorian infrastructure dating back over 130 years, and the temporary works that enabled its successful delivery.

The principal elements were:

  • Refurbishment and modification to the existing Connaught Tunnel and approach ramps, including converting the twin binocular tunnels into one large-bore tunnel, requiring the central section to be removed and rebuilt by ‘cut and cover’ method enabled by two cofferdams in the dock allowing dewatering.

  • Construction of the surface rail between Custom House Station & North Woolwich portal

  • In the Considerate Constructors’ Scheme National Awards 2014 the project was Runner up in the Most Considerate Site category

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