| 摘要 |
In a rock anchor bolt a centering member (8) includes an outlet hole (21) for removing any leakage water flowing into a borehole. The rock anchor bolt includes a sealing device (22) provided around the outer end (17) of a tube (14) to seal the borehole watertight as a tightening nut (11) is being tightened, and an outlet tube (23) provided in a casting space (15) between the tube (14) and a drawbar (2) to carry out the leakage water as grouting paste (16) is being injected, the inner end (24) of which outlet tube extends to the vicinity of an expansion member (13) and the outer end (25) of the outlet tube extends out from the outlet hole (21) of the centering member (8). The tube (14) has one or more first casting holes (19) at the outer end (17) of the tube (14) in the vicinity of the sealing device (22) and one or more second casting holes (20) at the inner end (18) of the tube in the vicinity of the expansion member (13). As grouting paste is being injected, it fills the casting space between the tube and the drawbar as well as the space between the borehole and the tube from the outer end toward the inner end so as to force any leakage water ahead of the grouting paste to the inner end of the outlet tube. |
