| 摘要 |
PROBLEM TO BE SOLVED: To perform a work with revolving in a narrow mountainous road and use a large working device. SOLUTION: A super structure 2 comprises a cab 5, a building cover 6 for forming a prime motor chamber, a control valve, a counter weight 11 and the like provided on a rotary frame 3, and the whole body is set within a virtual circle having a rear end rotating radius R extending from the rotating center to the rear surface side of the counter weight 11. The rear end rotating radius R is set to the added value of the half dimension of the vehicle width dimension W (W/2), the margin M of the difference between the road width dimension W0 and the vehicle width dimension W, and the protruding dimension A according to the inclination of a slope.
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