Connaught Tunnel

Project Description

The Connaught Tunnel forms a significant part of the Crossrail Central Section. Built using brick in 1878 and not in passenger use since 2006, the tunnel is not only a historical part of London's underground transport infrastructure, but will also be the only tunnel refurbished and reused in London's Crossrail expansion project.

Alan Auld Engineering Ltd (AAE) were employed to design and detail the temporary works and construction sequencing in order to allow the removal of the existing structure and the construction of the proposed box culvert. The temporary works consisted of steel beams supporting the roof. As a requirement of the construction programme and sequencing of the works, we also designed and detailed a series of horizontal props supporting the sides of the tunnel. The temporary and permanent loadings were evaluated by FE analysis, and the design of temporary strutting allowed the central arch pier to be dismantled expediting the construction.

AAE is also pleased to announce that following completion, the project was runner up in the “Most Considerate Site” category of the Considerate Constructor’s Scheme National Awards 2014. This is in line with our goal of being a company committed to the highest standards in health and safety.