| 摘要 |
A semi-submersible structure for use in open water comprises a working platform 7; a plurality of columns 5 on which the working platform is mounted and buoyancy generating means for supporting the working platform above the surface of the water. The buoyancy generating means can either comprise the columns themselves or float means disposed, at least in the semi-submersed state of the device under water. Alternatively the buoyancy generating means can comprise a combination of buoyancy generating columns and float means. Stabilising chambers are formed on or attached to either the columns or the float means outside of the central area staked out by the columns. Each stabilising chamber has a vent 3 at its upper end and a remotely controllable device 2 at its lower end, and the stabilising chambers are freely flooded with water in the semi-submersed position of the structure. In this way, in the event of an undesired leakage in the semi-submersible structure leading to a substantial change in the trim angle thereof, one or more of the stabilising chambers surfaces and thereby changes the position of the centre of buoyancy of the structure in the sense of counteracting the change in trim angle resulting from the leakage. <IMAGE> |
