Flytbar struktur for installasjon av en offshore vindturbin samt fremgangsmåte for samme

摘要

A wind powered generator (1) for locating offshore comprises a semi-submersible structure (5) with a mast (6) extending upwardly therefrom for carrying a wind turbine (3). A primary buoyancy chamber (16) is formed in the semi-submersible structure (5), and a primary anchor cable (23) is secured to the semi-submersible structure (5) in the primary buoyancy chamber (16) by a primary connecting bracket (22). The primary anchor cable (23) extends directly downwardly to a primary anchorage (24) in the sea bed (25) for anchoring the semi-submersible structure (5). Additionally, a winching mechanism (not shown) is provided for winching the semi-submersible structure (5) downwardly on the primary anchor cable (23) in the water against the upward buoyancy force acting on the semi-submersible structure (5) for raising the centre of flotation of the semi-submersible structure (5), for in turn increasing the righting moment acting on the semi-submersible structure for returning the semi-submersible structure (5) to its equilibrium flotation state in the event of the semi-submersible structure (5) tilting from the vertical.