Overcoming congestion below ground with a D-shaped pile / Beherrschung von begrenzten Platzverhältnissen durch Ausführung eines D-förmigen Pfahls

The paper describes some of the challenging geotechnical issues related to the redevelopment of a central London site in Tottenham Court Road. The London Underground station is being upgraded, and proposed tunnels of the Crossrail project and the Denmark Place project also have to be accommodated, which led to significant difficulties due to spatial restraints underground. Innovative solutions have been adopted for the design and installation of some of the piles together with an unprecedented low clearance between piles and a running tunnel of the Northern Line and the proposed Crossrail tunnel respectively. For one pile, a D-shaped section had to be chosen due to space limitations in the ground.