| 摘要 |
PROBLEM TO BE SOLVED: To provide a pile driver capable of also accommodating a longer leader than a rated leader and widely setting an elevating/lowering speed of a work device.SOLUTION: One end of a wire rope (lifting long wire rope 18a) for suspending and lifting a work device (auger 17) provided to be lifted along a leader (long leader 15a) erected on a base machine 14 is connected to a first winch, while the other end of the wire rope is connected to a second winch, and the work device is lifted along the leader by actuating both the winches. The work device can be lifted at high speed by actuating both of the winches in the same direction. The work device can be lifted at ultra-low speed by actuating both of the winches in mutually opposite directions. |
