JPH02199393A - Pipe joint structure for sewer pipe - Google Patents

Abstract

PURPOSE:To satisfactorily maintain water-tightness against the inner and outer pressures by forming inside faces on both sides located at the front and rear in the pipe axial direction of a circular groove formed on the receiving port of a pipe end section and outside faces of a ring packing faced to the inside face perpendicular to the axial direction. CONSTITUTION:A receiving port 12 is formed at the end section of one pipe 11, and an inserting port 14 is formed at the end section of the other pipe 13. A circular groove section 15 is formed on the inner periphery of the receiving port 12, and a ring packing 16 is arranged. Inside faces 17 and 18 on both sides located at the front and rear in the pipe axial direction of the groove section 15 are formed perpendicular to the pipe axial direction. Outside faces 19 and 20 of the packing 16 faced to the inside faces 17 and 18 of the groove section 15 are also formed perpendicular, and a recess is formed on the outside face 20. The packing 16 is received by the inside face 17 against the inner pressure of the pipe and expanded in the radial direction by the recess, the packing 16 is received by the inside face 18 against the outer pressure and deformation is suppressed, and good water-tightness is maintained against the inner and outer pressures.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a pipe joint structure for a sewer pipe.

2. Description of the Related Art A conventional pipe joint has a structure as shown in FIGS. Both tubes 1 and 3 are connected by inserting an inlet 4 formed in the section. An annular groove 5 is formed on the inner peripheral surface of the socket 2.
An annular protrusion 6 that protrudes in the radial direction is formed on the bottom surface. Further, a ring packing 7 is disposed in the groove 5, and the ring packing 7 is locked by the protrusion 6 in the tube axis direction. Further, an inner surface 8 of the groove 5 located on the socket opening side is formed perpendicular to the tube axis, and this inner surface 8 receives the head 9 of the ring packing 7. Further, the ring gasket 7 shuts off water between the socket 2 and the socket 4 at the body portion 1O.

Problems to be Solved by the Invention However, in the above-described conventional pipe joint structure, the ring packing 7, which is held against the inner surface 8 of the groove 5 via the head 9, responds to the internal pressure applied from inside the pipe. The body IO can be expanded in the radial direction of the tube to maintain good watertightness, but against external pressure applied from outside the tube,
Since there is no member to receive and stop the body 10 of the ring packing 7, the body 10 is pushed out in the direction of the tube axis, and the pressing force of the ring packing 7 against the insertion port 4 is weakened, making it impossible to maintain watertightness. There was a problem that disappeared. In particular, in gravity flow sewer pipes, the pressure of the water fluid flowing inside the pipe is not very high, and the pressure difference between the inside and outside of the pipe is small, so it is easily affected by external pressure. The issue was how to maintain their sexuality.

The present invention solves the above problems, and aims to provide a pipe joint structure for a sewer pipe that can maintain watertightness against internal and external pressures.

Means for Solving the Problems In order to solve the above problems, the present invention provides a socket formed at the end of one pipe, and a socket formed at the end of the other pipe and inserted into the socket. In a pipe joint structure comprising a socket and a ring gasket disposed in an annular groove formed on the inner circumferential surface of the socket to shut off water between the socket and the socket, the pipe axis of the groove is The inner surfaces on both sides located at the front and back of the tube and the outer surface of the ring packing corresponding to the inner surfaces are formed perpendicular to the tube axis direction.

Operation With the above-described structure, the ring packing is held against the inner surface of the groove on the socket opening side and is pushed out in the radial direction of the pipe in response to internal pressure applied from inside the pipe, thereby maintaining good watertightness. In response to external pressure applied from outside the pipe,
The ring packing is fixed on the inner surface of the groove on the back end side of the socket, suppressing deformation in the tube axis direction and maintaining good watertightness.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. 1 to 4, one end of the pipe 11 has a socket 1.
2 is formed, and a socket 12 is formed at the end of the other pipe 13.
A receptacle 14 that can be inserted into the inside of the receptacle is formed. An annular groove 15 is formed on the inner circumferential surface of the socket 12, and a ring gasket 16 is disposed in the groove 15 to shut off water between the socket 12 and the socket 14. Inner surfaces 17 on both sides of the groove 15 located at the front and back in the tube axis direction.
18 is formed perpendicular to the tube axis direction. The ring packing 18 is made of a rubber material, and an outer surface 19.20 corresponding to the inner surface 17.18 of the groove portion 15 is formed perpendicular to the tube axis direction, and an inner circumference corresponding to the insertion port 14 is formed. The surface 21 is formed to reduce in diameter from the socket opening side toward the back end side of the socket. Further, a cap portion 22 having an arcuate cross section is formed on the outer surface 20 of the ring packing 1G located at the rear end of the socket.

The effects of the above configuration will be explained below.

In response to the internal pressure applied from inside the pipe, the ring packing 16 is stopped by the inner surface 17 of the groove 15 on the socket opening side, and the receiving part 22 stops the internal pressure and is pushed out in the radial direction of the pipe. , good watertightness is maintained. In response to external pressure applied from outside the tube, the ring packing 1B is held against the inner surface 18 on the back end side of the socket of the groove portion 15, and is locked in the tube axis direction and moved in the tube axis direction. deformation is suppressed and good watertightness is maintained.

Effects of the Invention As described above, according to the present invention, good watertightness can be maintained because the ring packing is received by the inner surface of the groove against internal and external pressure.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention, FIGS. 2 and 3 are operating state diagrams of a ring packing in the same embodiment, and FIG. 4 is a sectional view of the ring packing in the same embodiment. Figure 5 is an overall configuration diagram showing the conventional pipe joint structure, Figure 6
The figure is a sectional view of the ring packing in the same embodiment. 11, 13...Pipe, 12...Socket, 14...Socket, 15...Groove, 16...Ring packing, 17.
18...Inner surface, 19.20...Outer surface, 2I...
・Inner circumferential surface, 22... bulge.

Claims (1)

[Claims] 1. A socket formed at the end of one pipe, an insertion port formed at the end of the other pipe and inserted into the socket, and an annular socket formed on the inner peripheral surface of the socket. In a pipe joint structure equipped with a ring packing placed in a groove to shut off water between the socket and the insertion port, the inner surface on both sides of the groove located at the front and back in the direction of the tube axis, and the inner surface correspond to the inner surface. A pipe joint structure for a sewer pipe, characterized in that the outer surface of the ring packing is formed perpendicular to the pipe axis direction.