Heavyweight establishment

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Drawing of a wind turbine of the Nysted Havmøllepark on a heavyweight foundation
Heavyweight foundations for the Thorntonbank offshore wind farm

A gravity foundation (including gravity foundation or gravity foundation is called) in building a shape of the foundation for offshore construction which, only by means of a heavy ballast ( dense provides than water) and, without further anchorages for the stability of the structure.

A prerequisite for the use of heavyweight foundations is a seabed that has sufficient bearing capacity in the upper layers, but also at greater depths. Depending on the diameter, this can be up to 50 m below the sea floor. The foundation is then built on or only a few meters below the sea floor. Usually this is done with prefabricated caissons made of steel or concrete , which are lowered and ballasted on site. A disadvantage compared to other forms of foundation such as B. the monopile is the complex preparation of the ground. In addition, the required ballast mass increases disproportionately to the water depth, so that this form of foundation becomes less economical with increasing depth.

The finished heavyweight foundation protrudes a few meters out of the water, whereby this part is often widened like a cone in order to drain away the drifting ice without damage in winter. Finally, the structure, e.g. B. a wind turbine , screwed on.

Web links

literature

  • Floating foundations for offshore wind farm in the English Channel · “Fécamp” . In: Schiff & Hafen , issue 6/2014, p. 54, DVV Media Group, Hamburg 2014, ISSN  0938-1643

Individual evidence

  1. ^ Karl Josef Witt (ed.): Grundbau-Taschenbuch: Part 3 - Foundations and geotechnical structures . John Wiley & Sons, 2010, ISBN 978-3-433-60062-7 , pp. 417 f . ( limited preview in Google Book search).
  2. ↑ Foundations and foundation structures. offshore-windenergie.net, archived from the original on January 10, 2015 ; Retrieved November 17, 2013 . Page was probably moved to: Foundations and foundation structures. German Federal Ministry for Economic Affairs and Energy, accessed on November 5, 2015 .