Gallileo Tower Frankfurt am Main

Innovation – in the Frankfurt clay

The slim silhouette of this tower has been a feature on the Frankfurt skyline since 2002. During construction, KREBS+KIEFER developed a method used many times since which enabled it to build anchored-back construction pits into the surrounding Frankfurt clay that exceeded the limits of feasibility in place until then.

For stiffening, the engineers used coupled cores, which house the lifts, staircases and utility ducts of the tower. The quality of the materials and the thickness of the core walls vary from top to bottom and were determined by the need to fulfil the deformation and comfort criteria for wind loads in an east-west direction.

To minimise setting the waterproof concrete basement is based on a combined pile and slab foundation with a slab of thickness of 2.50 m – 3.50 m and a total of 89 foundation piles. Geothermic warmth is used to cool and heat the tower by means of these energy piles.

The 18 m deep construction pit was under very high ground water pressure. As an innovative and cost-effective alternative to a stiffened pit lining, KREBS+KIEFER designed slanted stress-relieving lances to limit ground water pressure.


  • Structural Engineering