| 摘要 |
PROBLEM TO BE SOLVED: To provide a guard pipe bolt capable of sufficiently reducing an amount of projection of a bolt head part from the outer peripheral surface of the pipe. ! SOLUTION: A guard pipe bolt 20 comprises a supporting column 10, a plurality of cylindrical pipes 11, 12 arranged at a forward part of the supporting column 10 and extended in a straight line manner and inner sleeves 13 connecting the pipes 11 and 12. The bolt includes a plate-like bolt head part 20a having a specified thickness and a rod-like bolt leg part 20b fixed at the lower surface of the bolt head part 20a. The bolt leg part 20b is inserted into a communicating hole 50 that is constituted by communicating a bolt hole 13a of the inner sleeve 13 with a bolt hole 12a of the pipe 12. The bolt head part 20a is positioned on the outer peripheral surface of the pipe 12 and curved along the outer peripheral surface of the pipe 12. The bolt hole 12a of the pipe 12 and the bold head part 20a are set in such a way that a width of the pi |
