| 摘要 |
A crane performs a self-assembling/disassembling operation using a hoisting winch (8), a hoisting rope (9), and a hanging hook (10), and includes a sheave device for guiding the hoisting rope on an upper portion of a lower boom (4). The sheave device includes a first sheave (15) on a rear side of the lower boom (4) and second and third sheaves (16,17) on a front side of the lower boom (4). The second and third sheaves (16,17) are arranged next to each other in the left-right direction, and the rope end is attached to the lower boom (4) at a position near the top end of the lower boom. Accordingly, a lifting height in the self-assembling/disassembling operation is increased and the rope end can be attached/detached easily and safely from the front side of the lower boom (4) when the lower boom is laid on the ground. |
