| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for easily and economically realizing the higher quality of a lock bolt than ever before without losing any advantage of workability for making surely the filling of a hardener by the conventional "double pipe digging" and a boring rod by a "self-drilling bolt" as an injection pipe and a reinforcing bar as they are. SOLUTION: A boring lost bit 1 having a diameter slightly larger than an outside diameter of an outer pipe 3 simultaneously driven together with the self-drilling bolt 2 is mounted to the front end of the self-drilling bolt 2 as a hollow structure, the front end section of the outer pipe 3 is opened at a certain distance from the lost bit 1, the outer pipe 3 and the self-drilling bolt 2 inside thereof are bored and driven up to a predetermined depth in a state to place the centralizer 4 aiming at centering with the inside of the outer pipe 3 and the self-drilling bolt 2 to an opening section of the outer pipe 3 or in the vicinity thereof, and then, the hardener is filled from the front end lost bit outlet 5 through an inside hole 6 of the self-drilling bolt 2, and the outer pipe 3 is pulled out in a state to leave behind the self-drilling bolt 2 and the front end lost bit 1 to construct the double pipe digging lock bolt. COPYRIGHT: (C)2004,JPO
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