| 摘要 |
PROBLEM TO BE SOLVED: To maintain water-stopping performance even if the earth pressure is applied, in a connection structure for connecting a pipe to be buried in the ground with a through hole made in the side face of an underground box.SOLUTION: In a pipe connection structure 11 for connecting a spirally corrugated pipe 14 with the through hole 73 of an underground box 71, by holding the periphery of the through hole 73 by a pipe joint 12 having a female screw part 21 to be screwed over the outer peripheral surface of the spirally corrugated pipe 14, and a contact surface 23a coming into contact with the periphery of the through hole 73 of an underground box 71, and a bellmouth having a male screw part 31 screwing to the inner peripheral surface of the spirally corrugated pipe 14, and a contact surface 32a coming into contact with the periphery of the through hole 73 of an underground box 71, a cylindrical protrusion 25 fitting to the through hole 73 is formed on the pipe joint 12, thus preventing the contact surface 32a of the pipe joint 12 from displacing in a direction separating from the periphery of the through hole 73. |
