| 摘要 |
PROBLEM TO BE SOLVED: To improve workability of attachment and detachment work of a side frame. SOLUTION: A rail is fixed to a lower boom 3A, and a sheave 33 is provided so that it can move along the rail. A hydraulic cylinder 36 is connected to a rotating member supporting the sheave 33 via a joint member, and the sheave 33 is moved by extension and contraction of the hydraulic cylinder 36. A hoisting rope 4a is suspended via the sheave 33, and the side frame 12 is suspended by hoisting rope 4a. The side frame 12 can be horizontally moved by extending and contracting the hydraulic cylinder 36 while adjusting a rope feed amount, and the workability is improved.
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