| 摘要 |
PURPOSE: A rock bolt is provided to prevent a ground failure caused by a shear fracture as inner and outer wires hold the leading end of a broken hollow body. CONSTITUTION: A rock bolt comprises a hollow body(110), a front cap(120), an end cap(130), and an outer wire(150). The hollow body comprises a hollow portion(112) where pressure fluid is injected, and the recessed part of the body is unfolded by the pressure fluid. The front cap is fitted into the outside of the leading end of the hollow body, and comprises the hollow portion where the pressure fluid is injected. The end cap is fitted into the outside of the horizontal end of the hollow body, and opens the hollow portion of the hollow body. The outer wire is installed outside of the hollow body, and fitted into the front and end caps with the hollow body. |
