PROBLEM TO BE SOLVED: To easily pass a floating crane in spite of height restriction and shorten movement time by arranging a table lifted by a lifting device on a bed ship, arranging a crane on this table, and lifting-up the table only during crane work and fixing it to the pontoon. ;SOLUTION: A table 5 liftable by a lifting device 7 is arranged on a pontoon 1, and a crane is arranged on this table 5. During crane work, the table 5 is lifted up and at this lifting position the table 5 is fixed to the pontoon 1. During turning of the crane, the table 5 is lifted down and crane is prevented from interfering with the lifting device. The lifting device 7 si constituted with a cylinder 8 standing on the pontoon 1 side, a sprocket 9 attached to this end, a chain 11 whose one end is wound around the sprocket 9 and fixed to the pontoon 1, and the other end having a weight 14 attaching or detaching to a stopper 13 provided on the table 5 side, and lifting operation is provided by expansion and contraction of the cylinder 8.;COPYRIGHT: (C)2000,JPO
展开▼
