著者

杉山 董 小川 久 吉田 隆一

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

vol.103, pp.1-10, 1961

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This heavy derrick gear was installed in sister ships SHUNKOKU-MARU and SHUN-EI-MARU, completed in Kawasaki Dockyard Company in July and August, 1960, respectively. Both ships which are owned by Nihon Kisen K.K. and operated by Hinode Kisen K.K., having identical overall length of 132.480m and deadweight of 9,009t, were designed to load and carry extra-super-heavy cargoes, such as rolling stocks, barges, heavy machineries and etc. The most unique feature of the heavy derrick, which has the capacity of 180 tons, is the adoption of the so-called "2 hatch-1 derrick system", enabling one unit of heavy derrick to serve two cargo hatches. Adoption of this system realized decrease in weight of about 20% from the ordinary "1 hatch-1 derrick system". The gear consists of a tower mast installed on the ship center line of maximum diameter 3.600m, with a goose neck ring provided at its foot and with a 180 ton heavy derrick boom connected with the ring. Fall wire and topping lift wire, which are led inside of the tower mast, are wound by 35 ton steam driven heavy duty winches installed on both sides of the upper deck. A heavy derrick boom is capable of rotating about 320° from 70° swing out position at the forward starboard side to 70° swing out position at aft starboard side. In order to minimize the friction by rotation Of the goose neck ring, the ring is supported by 692 roller bearings. The results of 200 ton overload test carried out for the gear illustrated favorable agreement with the respective design values. Details, design and the test results of the gear are described below.