Shaftesbury Theatre, London

LocationShaftesbury Theatre, London
RequirementRestricted Access Bearing Piles
Techniques
ClientShaftsbury Theatre

Project Overview

TechnikGS (TGS) was awarded the contract for the design and installation of the permanent bearing piles to facilitate the renovation and installation of a rooftop fly tower and associated stage equipment in one of London’s West End Theatres.

The piling platform was at stage level, 5m below external ground level, within the existing building. The only access to the working area was through double doors using localised cranage.

The works included the installation of over 40 bearing piles for safe working loads of up to 550kN in compression, with substantial shear loads of up to 50Kn per pile.

Project Challenges

  • Complicated access and severely restricted working constraints within building.
  • Pile installation within 400mm from face of walls to centre line of piles.
  • High shear loads.
  • Coring/drilling through existing concrete and masonry foundations.
  • Restricted site requiring careful planning with regard to material storage, concrete deliveries and spoil management.

Solution Delivered

TGS was able to provide a solution comprising a combination of 190mm and 300mm diameter piles installed vertically and inclined up to 10 degrees to carry working loads of up to 250kN and 550kN respectively.

In addition, stairway areas in the basement were reconfigured using 300mm diameter piles installed at 450mm longitudinal centres to form contiguous piled walls.

TGS was part of an experienced project delivery team which had worked together on numerous occasions and the planning and logistics of the works programme were paramount, as the theatre was only closed for 8 weeks between prearranged show dates.

Many of the piles were installed to support the heavily loaded column supports for the state of the art fly tower, designed to manoeuvre very large structures around the stage.

Major obstructions in the ground had to be overcome using coring and drilling equipment. Once these masonry and concrete obstructions had been drilled, the cased and augered piles were installed deep into the London clay 20m below basement level.