| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure of an opening for an installation pipe that prevents infiltration of groundwater into a main pipe from a connecting part with an installation pipe.SOLUTION: A structure of an opening for an installation pipe opens on a curved wall surface or a flat wall surface, and includes a flange 11 formed so as to fit on a wall surface 1b that includes the curved wall surface or the flat wall surface, and a flange member A provided with a boss 12 protruded from the flange 11 and inserted into an installation pipe 2 that opens on the wall surface for circulating water. A gap formed between the flange member and the wall surface 1b is shielded by inserting the boss 12 of the flange member A into the installation pipe 2 that opens on the wall surface 1b and bringing the flange 11 in contact with the wall surface 1b. |
