Jackets, Gravity base, Tripods and Tri-piles systems are also used depending on requirements and needs.
UHPC is used in all foundation techniques.
Monopiles
UHPC grouting material is used for the connection between monopile and transition pieces.
Monopiles have been deployed with even larger turbines in even deeper waters, currently up to 41 meters. 9 diameter monopiles are now in production. We estimate that more than 2000 monopiles worldwide have been installed with UHPC grouting and transitions pieces.
Benefits
Extremely high strength- Very good fatigue properties
- Minimal shrinkage
- Extreme bond between UHPC grouting material and steel
- Fast setting development
- Very high inner cohesion
- No mixing with sea water
- Absolutly seawater resistant
- Very low hydration heat
- No corrosion
Jackets
Jackets are generally considered to be better than monopiles for seabeds where the substrate is poor or deeper water. So here UHPC can be used in the "transition piece" and in the lower foundation.
Gravity foundations
Are well suited for rocky sea beds. The complete foundation system can be manufactured on land and then pulled into position with a ship and then sunk. Depending on the design, the entire foundation piece can be made from UHPC
The future - with floating foundation design
This includes
- Spar
- Semi-submersible
- Barge
- Tension-leg platform
Spars
First systems are already being tested. In the near future, a wind farm with spar systems is to be built off Scotland.
These systems can reach total lengths of over 90 meters, with about 75 m of them underwater. The entire underwater area can be made of UHPC.
Semi-submersible
Similar to the Spars, the whole underwater construction can be made of UHPC.
Barge
Barge systems are actually classic pontoon systems. There are now UHPC concrete available which in addition to their high strength also swim without the large cavities inside the barge must be generated.
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