Floating crane for installation of offshore wind turbine tower using the movable counter weight

摘要

The present invention relates to an offshore crane for installation of a wind tower using a movable counter weight, comprising: a boom having a support having a lower end hinged to the surface of the pants and an inclined angle formed at an upper end thereof; A spreader that is provided with a plurality of lugs on the upper and lower sides, and horizontally lifts and descends according to the pulling and loosening of the wire rope vertically descending from the second pulley; A lifting tool having a holder to which the wind tower is inserted and supported on one side thereof, a plurality of lugs provided on the upper and lower surfaces thereof, and interlocking with the spreader; The holder is provided on the opposite side of one side of the lifting tool, the position of the lifting tool can be moved back and forth in a state in which the lifting tool is engaged, and the lifting tool acts as a resistance force against the external force when the wind tower is seated on the holder. By including a counter weight that maintains the overall equilibrium; even if the height of the wind tower is higher than the height of the crane''s boom, lift the wind tower without using a two boom offshore crane or a large special crane at sea. In addition to being able to raise, it is possible to maintain the balance of the entire lifting tool by the movement of the counter weight in the lifting tool, so that the wind power tower can be stably installed without overturning at sea.