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Jan De Nul installs second gravity based foundation for Kriegers Flak offshore wind farm

Published 26 February 2018

Jan De Nul Group has installed the second gravity based foundation for the Kriegers Flak offshore wind farm located off the coast of Denmark, in the Baltic Sea.

The company stated the weather was favourable and the installation operation of this 10,000 tonnes masterpiece 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 Group’s most recent multipurpose vessel Adhémar de Saint-Venant.  As a result, this structure has been set down within a vertical accuracy of 0.01 degrees. A high-precision job under water.

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 Group on a barge in the Port of Ostend in Belgium. The barge was towed to Denmark on 8 January 2018.

Source: Company Press Release