At the Oberen Bahnhofstrasse in Rapperswil, a new residental and commercial building shall be constructed, for which the existing old building needs to give way. The new building will come to stand directly next to two older buildings, which are not allowed to be damaged due to the new construction. In this area, the geological conditions are variable and the ground rock surface can be found in very different depths.

The developer has given us the assignment to determine the geological-hydrogeological situation for which rotation core drillings and penetration soundings are being carried out. In the extremely soft building ground, the soundings reach depths of approximately 25 m which poses greater challenges towards the foundations of this construction project and the securing of neighbouring buildings.