| 摘要 |
A concrete pipe has a socket end and a spigot end which consists of an annular cap made of plastic material and having an inner wall with an inner diameter corresponding to the inner diameter of the pipe, an outer wall with an outer diameter smaller than the outer diameter of the pipe, and a web portion interconnecting the walls and forming the spigot end surface of the pipe. A portion for accommodating a sealing ring is disposed around the outer wall of the cap, and the cap is joined to the pipe by being axially pressed down over the pipe end so that the concrete fills out the space between the cap walls. |
