| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To skillfully and completely close a hole provided in a structural body of a concrete electric pole or the like, for instance, that has been constructed vertically. <P>SOLUTION: This invention is a plug for the hole provided in a structural body to close the concerned hole, which comprises a shaft-shaped bolt 1, a nut part 57 screwed to this bolt 1, a fastener part 5 having a cylindrical pipe unit 51 for turnably holding the concerned bolt 1 and an arm part 55 for degenerating, when axial compression force is received between the nut part 57 and the pipe unit 51, its axial length, and a buried plug part 7 consisting of an elastic member, interposed between the bolt 1 and the fastener part 5, which can close the hole to be extended in a direction orthogonal to the concerned shaft, when axial compression force is received by the nut part 57 screwed to the bolt 1 due to its rotation. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
