News

Byrne Looby expertise drives Crossrail forward

May 27, 2013

Crossrail is currently the largest infrastructure project in the UK and work is underway across the capital to deliver London and the South East’s newest railway line. Byrne Looby has been actively involved in several important sites, bringing our civil engineering expertise to key parts of the Crossrail project.

Byrne Looby designed heavy temporary support structures for the construction of the Stepney Green Shaft– one of several shafts built to facilitate tunnelling works on the line out from central London into Essex. Byrne Looby was commissioned by Dragados-Sisk to work on this deep shaft, where the integrated support system had to be designed to support significant loads and accommodate a complex construction sequence. Byrne Looby was also commissioned by Carillion-Spie to provide reinforcement details for the Stepney Green Shaft. We provided details for a 48m deep diaphragm wall running 140m along the perimeter of the shaft. We also designed temporary lifting steel to allow the massive diaphragm wall panels to be lifted into place.

At Finsbury Circus in the heart of the City of London, we were contracted by Balfour Beatty to design a floating raft above the District and Circle Underground lines. This was a particularly challenging project given that the foundations had to accommodate ground settlements from tunnelling. The proximity of the raft to a nearby Underground exclusion zone also added to the complexity of the situation. This work enabled the construction of the access shaft for the Crossrail Liverpool Street Station.

Further east, we undertook a damage potential assessment of the Connaught Tunnel. Here we worked for the contractor Vinci who were awarded the contract for the refurbishment of the Tunnel. The Connaught Tunnels are one of the oldest but disused parts of the Underground network, and now being brought back into use as part of the Crossrail project.