Excavation of the pit
In the summer of 2008, preliminary work was carried out on the construction site to the south of the Grossmarkthalle in preparation for the construction of the high-rise. This involved the excavation of the pit (secant bored pile wall) and construction of the pile foundations.
97 foundation piles and geothermic devices were inserted into the ground to a maximum depth of 37 m during this phase of the construction works, which was completed in October 2008.
Pipes forming part of the water circuit are attached to the pile cage and can be connected to the heating pumps in the heating centre. The use of geothermal energy can reduce the energy costs of the new premises.