| 摘要 |
PURPOSE: A removable rock bolt capable of easily separating a nail is provided to improve bearing power by securely fixing the rock bolt to the ground, and to reduce construction time. CONSTITUTION: A removable rock bolt capable of easily separating a nail is composed as follows. A head(110) is coupled to the top of a body(120). An upper fixture and a lower fixture(140) are fixed to the body. An operating unit(150) is elastically installed in a compressed spring(170), and moves with the upper fixture up and down. An operating bar is fixed to the inner surface of a perforated hole. A nail(180) is coupled to the bottom of the body to be removable.
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