| 摘要 |
PROBLEM TO BE SOLVED: To simply replace a revolving structure carried on a hull. SOLUTION: A spacer 46 formed by a thick cylinder is provided between a pedestal 6 of the hull 1 and a revolving wheel 40 of the revolving structure 31. The spacer 46 and a flange part 6B of the pedestal 6 are fixed by a bolt 47, and the spacer 46 and an inner ring 42 of the revolving wheel 40 are fixed by a bolt 45. By this arrangement, in loading the pedestal 6 of the hull with a large revolving structure 31, even if the hole position of a bolt hole 42B of the revolving wheel 40 (inner ring 42) fitted to the revolving structure 31 and the hole position of a bolt hole 6D of the pedestal 6 (flange part 6B) are different, the revolving structure 31 can be easily carried on the pedestal 6 through the spacer 46 so as to reduce the cost in replacing the existing revolving structure with a large-sized revolving structure 31.
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