METHOD FOR CONSTRUCTION OF OFFSHORE GRAVITY PLATFORMS AND INSTALLATION OF SUCH ON A SEA BOTTOM BY MEANS OF CRANES

摘要

A method for construction and installation of a gravity platform (1) which is in entirety being constructed on at least one floating construction and ballastable barge or the like (7). Subsequent to that the platform (1) is ready-built in one or several parts, it is in separate parts lifted off from the construction barge or barges by means of one or more cranes (8) and is immersed for assembly in correct site on the sea bottom by ballasting one barge to a water level (9) substantially level with the top edge of at least one bottom section and pumping air into the bottom sections to reduce the effective weight of the platform.