Low Headroom Minipilng is necessary to retain abutments of a listed bridge in the path of Tunnel Boring.
Immediately next to Paddington Station is a listed early 1900’s steel bridge.Lord Hill’s crosses existing railway lines and the new Crossrail route will also pass beneath this bridge. As it does so foundations of the northern abutment will be undermined because at this point the new East –West link is very shallow.
A scheme of 600 dia piles was proposed by the BAM Ferrovial Kier Team and Keller set about installing these piles in headroom down to around 5m. Using Klemm 709 rigs these high torque machines were able to cope with handling short lengths of augers.
The piles were installed at various angles in pali radice fashion in order to provide a buttress and so avoid deflection as the route passes close by.