| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a cylindrical structure which can be installed easily in a short time when a steel pipe is mounted on a wall surface. SOLUTION: First and second projecting annular parts 3, 4 are formed to be split from each other along the longitudinal direction of a cylindrical structure 1, the first projecting annular part 3 being formed to have a larger diameter than a through hole 5a formed in a bulkhead 5, the second projecting annular part 4 being formed to have a small diameter such that it can be passed through the through hole 5a. A compression jig 7 or the like compresses the space between both end faces 1a, 1b to make the second projecting annular part 4 greater than the diameter 5b of the through hole 5a, and both of the projecting annular parts 3, 4 are designed to be capable of being pressed against the opposed bulkhead 5A, so that a welding operation can be omitted, with the result that the cylindrical structure 1 can easily be mounted on the bulkhead 5A in a short time.</p> |
