| 摘要 |
PROBLEM TO BE SOLVED: To provide the drainage structure of a revolving superstructure in which water entering into the revolving superstructure can be drained by simple operation by utilizing a jack-up, and the clogging of a drain inlet due to soil and sand or the like is also reduced extremely. SOLUTION: In the revolving superstructure having a working machine on the front side, drain guide plates 50 are installed on both left-right sides of a hole 41 for maintenance formed to the floor section of the center frame 31 of the revolving superstructure, and water stored in the revolving superstructure is moved backwards on the basis of the jack-up operation of the working machine, introduced by the drain guide plates 50 and discharged to the outside through the hole 41 for maintenance.
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