Influential Parameters on Offshore Jacket Structure Launching

J. Ocean Eng. Technol. 2001;15(2):141-147.

해양 자켓구조물 진수 영향인자에 대한 고찰

조철희,김경수,김재환,이수훈

인하대학교 기계공학부,인하대학교 기계공학부,인하대학교 기계공학부,인하대학교 기계공학부

Keywords: Jacket, Launching, Offshore Structure

핵심용어: 자켓, 진수, 해양구조물

Abstract

The launching process is one of the most critical operations for large structure in offshore installation. Since as the size increases it limits the availability of offshore crane facilities, the large jacket structures are often installed by launching. As the structure approaches to tilt beam, it reaches critical load, and there are parameters to affect on launching procedure. The major influential parameters are trim, draft of barge, center of gravity, center of buoyancy and reserved buoyancy of jacket. As increasing of trim and draft, structural loads tend to decrease. The trim is found to be more contributing than draft on structural loads. Therefore the trim should be increased so as to decrease structural loads and to avoid stalling of structure and submergence of stern. During the launching process, the distance between jacket and seabed should be investigated which differs from the amount of reserved buoyancy and launching condition of barge. In this paper the effects of parameters on launching process are numerically investigated.