Jan de Nul to install foundations for Swedish offshore windfarmNews // December 19, 2011
Dredging and marine contractor Jan De Nul Group has been awarded a project for the design, construction and installation of 16 concrete foundations for an offshore windfarm in the Swedish part of the Baltic. The customer is E.ON.
Jan De Nul has already started design of the foundations for the 3MW wind turbines, including fatigue calculations and physical modelling. The concrete foundations, 1,800 weighing tonnes each, will be constructed in Zeebrugge, Belgium, from March 2012 onwards.
It will take four months to pour the 10,000m³ of concrete required into the 24.5m high foundations, which have a diameter at the base of 18m.
The foundations will be towed from Zeebrugge to Sweden May 2012 onwards on super pontoons owned by Jan De Nul.
On site in Sweden, Jan De Nul will mobilize a vessel to dredge a pit in the seabed up to sufficient bearing capacity of the subsoil, on which a rock layer will be placed by a stone dumping vessel. The foundations will be installed on top of this rock layer, ballasted (loaded) with sand and protected with rocks against waves.
Completion of these combined civil and dredging work to be executed by the company is expected in the autumn of 2012.