Hollow Foundation for concrete towers

This approach allows for anchoring of the concrete tower to the foundation by using post-tensioned cables.

While there are variants where the concrete tower sits directly on a classic slab foundation with produding bolts, the most common foundation scenario features a cellar where cables are anchored and cable tensioning tools are placed.

Creating a cave

Reinforcement design for the hollow foundation is also substantially different from that of standard gravity foundation. Besides the customized interior formwork, special attention has to be paid to the the design of the anchoring bulkheads where concentrated loads are applied to the concrete in very limited spaces.

Cellar sealing is important

The lower surface of the foundation acts as a bearing ring while the higher weight of the concete tower helps to stabilize the entire structure. The light slab closing the center of the cellar against the soil requires special attention to prevent water ingress.