Van Boekel GmbH, our German branch, has been commissioned by de Emscher for the “vogelheim” project in Germany. This involves installing a settling basin at a sewage pumping station and redirecting the existing sewerage system to this basin, so that it can serve as a temporary catch basin when necessary. This all has to be done in the city centre of Essen, with minimal space to work and store the necessary resources and equipment.
The construction pit has a depth of 10.50 m below ground level, with the scope statement specifying a helical retaining wall to make this possible. However, we proposed an alternative, as a supplement to the main tender, and built a CSM wall. This milled wall has a surface area of approx. 2500 sq.m. and reaches down to the underlying marlstone, yielding a waterproof construction pit.
Immediately after installing the falsework, we excavated 11,000 m3 of soil and applied a drainage layer to drain off residual water during the project.