Kriegers Flak Sees Second Gravity Based Foundation in Place

Only a few days after the first gravity based foundation (GBF) was installed, the project team of Jan De Nul Group floated off and installed the second and even larger GBF for the offshore wind farm Kriegers Flak in Denmark.

According to the company, the installation operation of this 10,000-tonnes GBF went according to plan.

The barge containing the GBF submerged, the heavy lift vessel Rambiz connected to the GBF through its crane hooks and towed out the structure once it started to float. An assisting tug subsequently towed the Rambiz together with the structure to its final installation location where the vessel in combination with an in-house designed ballast module set the structure down onto the seabed.

Both GBFs have been installed on a gravel bedding layer which has been accurately prepared by Jan De Nul’s multipurpose vessel Adhémar de Saint-Venant.

The Adhémar de Saint-Venant will now start with the ballasting of the structures and the scour protection works around them.

Both foundations were constructed by Jan De Nul on a barge in the Port of Ostend in Belgium.

Jan De Nul Group and Smulders joined forces to build two Gravity Based Foundations (GBFs) for the high voltage station of the Danish offshore wind farm Kriegers Flak. Both foundations consist of a concrete part (GBF) and a steel structure on top. Jan De Nul Group was responsible for the design and construction of the concrete GBFs, while Smulders took care of the design and construction of the steel shafts and decks placed on top. Jan De Nul Group is in charge of the installation of both GBFs, the ballasting and the placement of scour protection in the offshore wind farm Kriegers Flak in Denmark.

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