IMPROVEMENTS IN AND RELATING TO SEMI-SUBMERSIBLE VESSELS

摘要

A semi-submersible vessel has a deck portion 1 constructed of trusses 16 to 23 supported by eight columns 3 to 10 on a ring of pontoons 11 to 14. The bottom and the lower parts of the sides of the deck portion 1 are clad with watertight plating 35 and 38 so that the deck portion can be towed out of a construction dock without needing a supporting barge. The deck portion 1 is then mated with the tops of the columns 3 to 10.