| 摘要 |
PROBLEM TO BE SOLVED: To efficiently perform counterweight attaching/detaching work and to simplify constitution. SOLUTION: A counterweight 11 is provided with an elevating cylinder 5, and the counterweight 11 is elevated almost vertically between an abutting plate 6 of a revolving frame 3 and the ground surface G by this elevating cylinder 15. In the case of performing work of attaching/detaching the counterweight 11 to/from the revolving frame 3 in the work field or the like, a crane or the like for lifting the counterweight 11 can therefore be dispensed with, and attaching/detaching work can be efficiently performed. Since there is no need to provide link mechanism or the like between the revolving frame 3 and the counterweight 11, constitution can be simplified. |
