摘要 |
PROBLEM TO BE SOLVED: To simplify handling operation of a hole piercing machine for props for a tunnel mulch performing a hole piercing work and increase work efficiency by mounting an elevating frame having a hole piercing lever and a marker lever, and going up and down the elevating frame. SOLUTION: This hole piercing machine for props for a tunnel mulch is constructed to detect that a lowering distance of an elevating frame 1 arrives a prescribed value and switch an action of a hydraulic pressure swithcing value 32 to raise the elevating frame 1 when the elevating frame 1 is made to a lowering state by an operation of an operating lever 14, and further to detect that the elevating frame 1 arrives the highest position and switch the hydraulic pressure switching valve 32 to stop the elevating frame 1 at the highest position, then a hand operation of a vehicle body is simplified.
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