有脚式海洋作業台船の波浪中離着底時の挙動について
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概要
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When a self elevating platform carried out the jacking up or jacking down operations in the rough sea, its very long legs collide to the sea bottom due to the pitching motion of the platform's barge hull, especially at the case of the legs are very close to the hard bottom. This shock load will affects very seriously to the leg's constructions and jacking mechanism. The shock load related with the wave height and period, also the gap between the leg base and the sea bottom. Model experiments were carried out at the Tokai University's circulating tank which has glass wall on both side. We observed the behaviour of the leg motion and took the 8 m/m movies. Also the shock load measured by the accelerometers. We get following results. The shock load on the weather side legs is larger than that on the lee side legs and maximum value is about 2.5 times of statically hull weight load on the each legs. i.e) 1/4× (hull weight), in case of gap δ= 0. S.E.P. swims down jumpingly to the lee side of wave because there are no mooring and restricted by anchoring seriously bending and shering effect to the legs. Meanwhile, these collision phenomenon occures few cases and has very short duration time in the whole working periods of S.E.P. . Then if we can use anti-pitching devise at this time, it is very efficient to decrease the shock lord. Actually it was reduced to about 60 percents in our model experiments.
- 社団法人日本船舶海洋工学会の論文
- 1977-03-30
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- 有脚式海洋作業台船の波浪中離着底時の挙動について
- 有脚式海洋作業台船の底面洗掘による安定について (第1報)