DYWIDAG Consolidates Monopile Foundations at Amrumbank West Offshore Wind Park
DYWIDAG successfully provided and installed post-tensioning systems to stabilize monopile foundations at the Amrumbank West wind park, addressing damage caused during the construction process.
Challenge
Amrumbank West, located 35 km north of Helgoland, consists of 80 wind towers and is situated in water depths of 20-25 meters. Each turbine generates 3.6 MW, providing energy to up to 300,000 households. During the installation of two monopile foundations, damage occurred at the construction joints between the lower and upper sections of the foundations. This required intervention to restore the full load-bearing capacity of these joints.
Solution
DYWIDAG deployed 52 Wire EX Tendons for each of the damaged monopile foundations, each 13.3 meters long, and installed them across the construction joints. The tendons were post-tensioned with a load of 4,000 kN per tendon to restore the load capacity of the joints.
The tendons, totaling 35 tons, were prefabricated and adapted for the project in DYWIDAG’s facility in Langenfeld, Germany. Additional reinforcement was integrated into the anchorage area, which streamlined assembly on-site and reduced setup time.
To protect against corrosion, the tendons’ sheathing was filled with a corrosion protection compound. This ensured no seawater could reach the tendons, and the same protection was applied during transportation across the North Sea.
Due to the remote offshore site, additional jacks and hydraulic pumps were deployed to minimize delays. Some tendons were also equipped with DYNA Force® Sensors for precise monitoring.
Outcome
Despite the challenging working conditions and limited space, the project was completed successfully, restoring the structural integrity of the monopile foundations and contributing to the continued operation of the wind park.
DYWIDAG successfully provided and installed post-tensioning systems to stabilize monopile foundations at the Amrumbank West wind park, addressing damage caused during the construction process.
Challenge
Amrumbank West, located 35 km north of Helgoland, consists of 80 wind towers and is situated in water depths of 20-25 meters. Each turbine generates 3.6 MW, providing energy to up to 300,000 households. During the installation of two monopile foundations, damage occurred at the construction joints between the lower and upper sections of the foundations. This required intervention to restore the full load-bearing capacity of these joints.
Solution
DYWIDAG deployed 52 Wire EX Tendons for each of the damaged monopile foundations, each 13.3 meters long, and installed them across the construction joints. The tendons were post-tensioned with a load of 4,000 kN per tendon to restore the load capacity of the joints.
The tendons, totaling 35 tons, were prefabricated and adapted for the project in DYWIDAG’s facility in Langenfeld, Germany. Additional reinforcement was integrated into the anchorage area, which streamlined assembly on-site and reduced setup time.
To protect against corrosion, the tendons’ sheathing was filled with a corrosion protection compound. This ensured no seawater could reach the tendons, and the same protection was applied during transportation across the North Sea.
Due to the remote offshore site, additional jacks and hydraulic pumps were deployed to minimize delays. Some tendons were also equipped with DYNA Force® Sensors for precise monitoring.
Outcome
Despite the challenging working conditions and limited space, the project was completed successfully, restoring the structural integrity of the monopile foundations and contributing to the continued operation of the wind park.
