A recent basement project in London required Bauer Technologies to construct 574no. of Ø880/780mm secant wall piles, at depths varying from 11m to 28.5m, as well as 51no. of Ø1300/1200mm bearing piles with plunge columns, at depths varying from 26.85m to 44.6m. The scope of works included the geotechnical pile design, as well as construction of 336 linear meters of guide wall. Eleven out of the 51 plunge column piles were installed through an existing basement using permanent liners. For the secant pile wall design Bauer cooperated closely with the client’s design team, in order to develop a secant pile wall configuration in compliance with the project specification, as well as the applicable party wall agreement that was in place. The depth of the secant pile wall primary piles was 11m, whilst the secondary piles reached to 28.5m, allowing for excavation of a 22m deep basement.

The permanently lined plunge column piles were installed through an existing basement, located under the piling platform. Bauer configured the piling rigs accordingly, in order to minimise ground bearing pressures and guarantee strict compliance with the applicable temporary works design for propping of the basement.