| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint structure of a box-shaped roof pipe, which enables unit box-shaped roof pipe dismantlement work to be easily performed even in the case of a narrow arrival shaft, by enabling a joint portion to be easily disengaged from the engaging piece between the unit box-shaped roof pipes adjacent to each other. SOLUTION: The joint 16 is constituted by engaging two engaging pieces 18 and two engaging pieces 19 together. The engaging pieces 18 are protrusively provided on the side surface 21a of one 12a of the unit box-shaped roof pipes adjacent to each other; and the engaging pieces 19 are protrusively provided on the side surfaces 21b and 21c of the other unit box-shaped roof pipes 12b and 12c. In the engaging piece 18 provided on the side surface 21a of the one unit box-shaped roof pipe 12a, a female thread hole 20 is provided in its base 18a. The engaging piece 18 is detachably fastened to the side surface 21a by screwing a bolt member 23, which is attached to a bolt fastening hole 22 from the inside of the unit box-shaped roof pipe 12a, into the female thread hole 20. The bolt fastening hole 22 is formed in a penetrating manner in the side surface 21a. COPYRIGHT: (C)2011,JPO&INPIT
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