초록 ▼

An offshore platform provided with several supporting legs ascending and descending vertically and installed in a specified place on the sea by lowering the supporting legs onto the seabed after being towed to the specified place. Each of the supporting legs has on its side racks extending longitudi

An offshore platform provided with several supporting legs ascending and descending vertically and installed in a specified place on the sea by lowering the supporting legs onto the seabed after being towed to the specified place. Each of the supporting legs has on its side racks extending longitudinally. The supporting legs are lifted and lowered by driving pinions that engage with these racks. The offshore platform can be held immovably on the sea by fixing the meshing of the racks with the pinions, which is accomplished by braking pinion drives, when the supporting legs have reached the seabed. This offshore platform is also provided with stoppers that can engage with and disengage from the racks through the lateral movement thereof toward and away from the racks. The supporting legs are held by both the pinions and the stoppers. To ensure that the whole load applied to the pinions and stoppers are appropriately shared by both, a control device is installed which detects these two loads and automatically drives the pinions so as to set this ratio of loads to an appropriate value.

대표청구항 ▼

A leg-holding device of an offshore platform comprising: a supporting leg having at least one column provided with a rack extending longitudinally on the side thereof and passing through a deck of the offshore platform; a lifting mechanism mounted on said deck and having at least one pinion engaging

A leg-holding device of an offshore platform comprising: a supporting leg having at least one column provided with a rack extending longitudinally on the side thereof and passing through a deck of the offshore platform; a lifting mechanism mounted on said deck and having at least one pinion engaging with said rack, a drive means for causing said pinion to rotate reversibly, and brake means for braking said drive means; a leg-holding mechanism mounted on said deck and having at least one stopper adapted to move toward and away from said column to engage with and disengage from said rack; first detection means for detecting load applied on said stopper; second detection means for detecting load applied on said pinion; and control means for adjusting an output of said drive means by comparing said loads in a manner such that the ratio of said loads is adjusted to a predetermined value.