| 摘要 |
PROBLEM TO BE SOLVED: To provide a vertical conduit tube such that the state of water flowing down inside can be observed.SOLUTION: A spiral flow type vertical conduit tube 1 including an outer cylinder part 2 and a spiral part provided in the outer cylinder part 2 is provided with a manhole cylinder part 11 in the center of the spiral part 3, and the manhole cylinder part 11 is provided with a window part 14 for viewing. Consequently, an operator who enters the manhole cylinder part 11 can observe a water flow in the vertical conduit tube 1 through the window part 14. Steps 13 for upward/downward movement are provided in the manhole cylinder part 11, so the operator can move up and down in the manhole by using the steps 11 for upward/downward movement. A base division part 7 is formed which includes division outer cylinder parts 5 formed by dividing the outer cylinder part 2 in a length direction and division spiral parts 6 formed by dividing the spiral part 3 including the manhole cylinder part 11 in a peripheral direction, and a plurality of basic division parts 7, 7 are coupled together in a length direction. |
