Connaught Tunnel

overcoming High risk factors was key for the success of this project

ByrneLooby have been heavily involved in the efforts to modernise the disused 19th Century Connaught Tunnel for use in the new Crossrail line. The refurbishment works of the old tunnel are high risk and challenging as the brick tunnel invert needs to be replaced and the section running under the Victoria docks lies very close to the dock bed.

Working closely with our client, we developed a solution which allowed the staged replacement of the brick tunnel invert in greater lengths than was previously considered acceptable.  Our enhanced sequence allowed our client to enjoy significant savings on time and also propping to be used as part of the temporary excavation.

Where the tunnel passes below the docks, cofferdams were used to facilitate the risky refurbishment works.  We independently checked the twin-walled cofferdams to ensure a robust design to allow the safe renewal of this historic tunnel.  

Scope of project

  • High risk refurbishment of a disused tunnel as part of the Crossrail project
  • Undertook a FEA to allow the replacement of the brick tunnel invert in 3.3m sections rather than the original 1.8m.
  • Independent design checking of cofferdams to ensure safe access for refurbishment works of the tunnel section below the dock.

Project Photos