| 摘要 |
A lifting rig is provided for lifting out of the water a buoyant load such as a bladder 19 containing oil recovered from an oil spill. The lifting rig comprises a sling assembly 301 having two opposed rigid side elements 310, 311 and a material sling 315 attached along two opposite sides to respective ones of the rigid side elements. The sling assembly is attached to a rigid lifting frame 303 by lifting lines 302 which are of a length such that the sling provides a cradle for supporting a load along its length when lifted clear of the water. The lifting frame serves to space out the lifting lines. The sling assembly has a buoyancy distribution such that, when lowered into water, the sling stays afloat along one side and sinks on the other side to permit a buoyant load to be manoeuvred over the sling. Preferably the sling is made from a non-buoyant material and one of the rigid side elements is made buoyant by means of floats 340. Detachable end panels (330, figure 1) may close off the ends of the cradle formed by the sling in lifting a load. |
