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Turbine Foundation Optimizer – For the Winds of the World | Cage Rock Foundation

Cage Rock Foundation – making the most out of weak bedrock

Cage Rock Foundation excels in locations with weak bedrock. It’s an option also if bedrock is 2‑5 meters below the surface. The loads are transferred from the tower to the rock through the anchor cage, concrete and 12 to 16 meter long rock anchors. The use of concrete and a wider base keeps the quantity of rock anchors low – each tower is supported with 16 to 30 rock anchors.

For example, a 5.5 MW turbine with a tower height of 120 meters uses:

  • 230 m3 of concrete (23 truckloads)
  • 35 t of steel and 28 FATBAR® 72 anchors (3 truckloads)
  • 1 Anchor cage (1 truckload)




CO2 emissions when compared to traditional solutions


Installation phases

  1. 1 day
    Anchor cage assembly

  2. 2-3 days

  3. 1 day

  4. 1 day

  5. 0,5 day
    Anchor installation

  6. 0,5 day
    Anchor tensioning

  7. 6-7 days

Specialist equipment

Installation team

8 skilled workers


See our other solutions

Gravity7 Wind Turbine Foundation – Optimizing the size, weight and costs

Used on a variety of geotechnical conditions: semi‑soft soil, load‑bearing soil, and solid rock. 

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Pile Wind Turbine Foundation – Soft soil performance second to none

Developed for use in locations with soft or semi‑soft soil types.

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Rock Wind Turbine Foundation – hard‑to‑beat CO2 emissions and costs

When solid bedrock is on the surface or max 2 meters deep, rock foundation is an optimum choice.

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