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Gravity Based Foundations For Red Sand 2

Photo: COWI

​Red Sand 2 offshore wind farm is located in the Baltic Sea just south of Denmark

​Red Sand 2 offshore wind farm is located in the Baltic Sea just south of Denmark. 90 new 2.3 MW wind turbines will complement the neighbouring 64 wind turbines at Nysted installed in 2002.

The gravity based foundations are prefabricated reinforced concrete structures, which are cast on barges in Swinoujscie, Poland. The structures attain heights of up to 18 metres. Each barge is towed to the offshore location where the foundations are placed on prepared gravel beds in excavations in glacial deposits.

The gravity based foundations are designed as reinforced concrete structures, consisting of an octagonal base plate with a cylindrical shaft in the centre. Outer walls along the edge of the base plate confine the ballast chambers for ballast stones of heavy hyperite to ensure sufficient dead load. Inner walls connect the outer walls to the shaft. The conical shape of the upper shaft part reduces the impact of ice loads. The shaft is filled with sand to protect the J-tubes inside as well as to provide dead load.

LAST UPDATED: 16.01.2017