| 摘要 |
PROBLEM TO BE SOLVED: To prevent moisture or water from being accumulated in a gap between ribs closest to the end edge of an underground pipe inside a connection part, in a connection structure configured by fitting a pair of underground pipes, on the outer peripheral surface of which the rib is formed, to each other.SOLUTION: An connection structure includes a pair of underground pipes 2, 3. On the outer peripheral surfaces of the underground pipes 2, 3, plural ribs 16, 21 projecting in a radial direction are formed with intervals along the axial directions of the underground pipes 2, 3. Between a rib 16A closest to an end edge 38 of the underground pipe 2 and a rib 16B adjacent to the rib 16A, an annular elastic member 32 is provided. The end part of the underground pipe 3 is externally fitted to the underground pipe 2 while airtightness is ensured with the elastic member 32.SELECTED DRAWING: Figure 2 |
