HYDRAULIC DEVICE FOR DRIVING CONSTRUCTION DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain driving hydraulic device driving a construction device for preventing the damage of the device or the occurrence of a noise. SOLUTION: The construction device driving hydraulic device is so constituted that a hydraulic oil is supplied and discharged through a pair of supply and discharge channels 102 and 104 provided with a selector valve 106 to a hydraulic motor 8 rotating a casing tube 10 and that it is inserted in the ground while rotating the casing tube 10. Check valves 24 and 28 for controlling an outflow of the hydraulic oil from the hydraulic motor 8 are provided to a pair of supply and discharge channels 102 and 104 in the case of stopping and, at the same time, throttles 26 and 30 are provided in parallel to the check valves 24 and 28.