著者

増田 征二 湯浅 高昭

出版者

公益社団法人日本船舶海洋工学会

雑誌

関西造船協会誌 (ISSN:03899101)

巻号頁・発行日

no.149, pp.25-30, 1973-06-30

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As a new mooring method of very large tankers at the outfitting quay, a two points mooring method has been adopted at Sakai Shipyard of Hitachi Shipbuilding & Engineering Co., Ltd. since August 1972. The two points mooring, consisting of two lines of anchor chain at the bow and the stern and their catching devices, has remarkable abvantages compared with the conventional wire rope mooring as follows: (1) In case of the wire rope mooring, it was quite difficult to arrange many lines so that they might have equally balanced load, and there was a risk of wire rope breaking at heavy wind. Meanwhile, two lines of chains are able to be arranged to have equal load at the bow and the stern part, and the maximum load of chain will be kept under the proof load of anchor chain. As large size anchor chain of high tensile (124 mm dia. of grade 3) being used, these lines are more endurable to the wearing-out, impact load and corrosion than the conventional wire rope mooring. Considering those items, the two points mooring is superior to the wire rope mooring in view of the safety of mooring strength. (2) As mooring chains being limited only to two, instead of more than 18 lines of mooring wire ropes, working hours for handling heavy mooring lines have been distinctly reduced. (3) Many mooring ropes are quite obstructive to the crane travelling and operation. The two points mooring improves the working area of outfitting quay and made the crane travelling free.