The foundation transmits the wind turbines' dead load and wind load into the ground.
Our foundations are always circular. Depending on the site, the ground can only absorb a certain amount of compressive strain, so the foundation surfaces are adapted accordingly. Circular foundations are designed based on this elementary realization and as a rule are installed as shallow foundations.
If necessary, for example in soft soil, a special deep foundation distributes the load down to deeper load-bearing soil strata. The piles, symmetrically arranged, are slightly inclined so that the imagined extended pile centre lines meet at a point above the centre of the foundation. This provides maximum force/load distribution over the entire surface.
Advantages of a circular foundation are:
- Forces are equal in all wind directions, whereas asymmetrical foundation pressure is possible with square bases or cross-shaped foundations.
- Circular design has proven to reduce the amount of reinforcement and concrete required. The circular design reduces the size of the formwork area.
- Backfilling the foundation with soil from the excavation pit is included in the structural analysis as a load. This means that less reinforced concrete is needed for foundation stability.