Lifting and Placing of Gravity Based Foundations for the Karehamn Wind Farm

Market: Renewables and Environmental
Scope of work: Lifting and placing of gravity based foundations for the Karehamn Wind Farm
Location: South East Kalmr, Sweden
Client: Jan De Nul NV
Period:  September - October 2012
HLV:  Rambiz

In September 2012 HLV Rambiz installed 16 gravity based foundations (GBF) in the Swedish part of the Baltic Sea, East of the Isle of Oland, in the vicinity of Karehamn.

The on-site water depths varies from 8 to 21 metres which meant that all foundations had different dimensions and weights. The heaviest foundation was over 1950 tonnes and a height of 24,5 metres.

The foundations were fabricated by Jan De Nul and constructed directly onto 2 large pontoons in Zeebrugge harbour in Belgium. The largest pontoon contained 12 foundations and the smallest pontoon had 4 foundations. From the harbour the pontoons were towed to the location in Sweden, where Rambiz lifted the foundations from the pontoons and placed them onto the prepared seabed.