| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily perform maintenance in a vertical pipe and to simply provide a guide passage in an existing pipe by integrating an air core cylinder having a helical guide passage on the outer circumference with a lock part so as to detachably fit it to a vertical pipe main body. SOLUTION: This pipe 10 with a helical guide passage is a vertical pipe, and constituted of a vertical pipe main body 11 and helical guide passages 12, 12'. A lock part 111 is provided on the upper end of the vertical pipe main body 11. An air core cylinder 13 of which the interior is hollow is raised on the nearly center part on the upper part in the vertical pipe main body part 11, and it is fixed to the lock part 111. A first helical guide passage 12 is arranged between the inner circumferential face of the vertical pipe main body part 11 and the outer circumferential face of the air core cylinder 13, and the inner circumferential face of the first helical guide passage 12 is integratedly fitted to the outer circumferential face of the air core cylinder 13. An outflow pipe 15 is connected to the lower end of the vertical pipe main body part 11, a second helical guide passage 12' is arranged inside the vertical pipe main body part 11 a little over the pipe top of the outflow pipe 15. The second helical guide passage 12' is not fitted to the air core cylinder 13.</p> |
