To absorb the displacement of a pipe end part inserted into a receiving port so as to prevent breaking by inserting the end part of the other pipe into the receiving port of the end part of one pipe and loading a hollow body having a gap in an inner part to be press-crushed between the end parts of the pipes opposite each other in the receiving port.

A receiving port 11 integrally formed via a flange joint part 10a vertical to an axial direction is provided in one end of a pipe 10, and the spigot of the other pipe 10' made of the same material as that of the pipe 10 is inserted into this receiving port 11 and connected. In this case, a rubber gasket 13 is fixed in a recessed groove 12 formed along the peripheral direction of the opening end inner side of the receiving port 11, and three ring bodies to be press-crushed are provided between the end parts of the opposing pipes 10 and 10'. Each of these ring bodies is formed to be hollow having a round cross-sectional shape and, when the compressing force of an axial direction is applied to a pipe joint part by an external force, each ring body is press- crushed in an axial direction, the displacement of the end part of the pipe 10' inserted into the receiving port 11 is absorbed and the damaging of its single wire or the receiving port is prevented.