| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydraulic source device for a hydraulic vibro pile hammer capable of easily coping with a plurality of hydraulic vibro pile hammers having different operation pressures. SOLUTION: A pressure setting part of a first system constituted by a relief valve 5E, an accumulator 5F, and a pressure switch 5G and a pressure setting part of a second system constituted by a relief valve 5H, an accumulator 5I, and a pressure switch 5J are provided as a pressure setting part of two systems having different set pressures. The pressure setting parts of the first system and the second system are constituted so as to switch and connect them through solenoid switch-over valves 5K, 5L corresponding to a change-over switch 6A.
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