| 摘要 |
PROBLEM TO BE SOLVED: To provide a rock bolt material pipe that can improve workability when assembling an expansion enlarged-type rock bolt, and provide the rock bolt, a construction method of the rock bolt and a manufacturing method of the rock bolt material pipe.SOLUTION: A rock bolt material pipe concerning the present invention includes: a deformed pipe formed cylindrically, having an inner space opened in axial both ends and including at least one recess extending axially in an outer circumferential surface, and having at least a recess plastically deformed in the shape of convex and expanded by injecting a pressurized fluid into the inner space; and a pair of end members attached respectively at both ends of the deformed pipe, having a through-hole in communication with the inner space of the deformed pipe, and having male screws or female screws. Both end members include similar screws among the male screws or the female screws, respectively.SELECTED DRAWING: Figure 10 |
