JP2001082649A - Connecting part of synthetic resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To water-tightly connect a synthetic resin pipe into an acceptor without twisting or sliding a rubber ring that is mounted by arranging support members that are not protruded outer than a, side surface of the rubber ring, on both side parts of the rubber ring of a spigot so as to support the side surface of the rubber ring. SOLUTION: A spigot 1 is formed on an outer peripheral surface of one end part to which a rubber ring 14 of a synthetic resin pipe P is mounted by fixing supporting members 15 composed of a pair of annular bodies to both side parts of the rubber ring 14 so as to support both side surfaces of the rubber ring 14. Each inner circumferential surface of the support members 15 is formed as a recessed and projection surface matched with projections 12 and narrow grooves 11 formed along an outer peripheral surface of the synthetic resin pipe P. Outer diameter of the supporting member 15 is formed smaller than an inner diameter of an acceptor, and the height of the supporting member 15 is set to about 2/3 of the height of the rubber ring 14. Adhesive agent may be used as means for fixing with the outer peripheral surface of the synthetic resin pipe P of the supporting member 15, or it may be fixed by means of fusing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting portion of a synthetic resin pipe having a spigot which is connected to a rubber ring in a receiving port.

[0002]

2. Description of the Related Art Conventionally, as a joint to be connected to a rubber ring by a differential method, although it is for connecting a concrete pipe,
For example, as described in Japanese Utility Model Publication No. 45-10538, as shown in FIG. 4, a grooved ring d is fitted into a recess c formed on the inner surface of a receiving port b of a concrete pipe a, and the grooved ring d is fitted. There is known a concrete pipe rubber ring joint or the like in which a rubber ring e is fitted.

[0003] Recently, synthetic resin pipes having a helical, shallow groove, ridge, or cross-sectional corrugation along the circumferential direction on the outer peripheral surface have been manufactured for the sake of production. In a synthetic resin pipe having a groove, a ridge, or a cross-sectional waveform along the circumferential direction on the outer peripheral surface, the structure in which the rubber ring is provided on the inner surface of the receiving port as described above cannot be adopted. That is, as shown in FIG.
In the case of a synthetic resin pipe p in which helical shallow grooves m and ridges t are alternately provided on the outer circumferential surface along the circumferential direction, a rubber ring g
Is attached to form a spout s. Even if a rubber ring is provided on the receiving port side, at the time of actual joining, it is unavoidable to provide a rubber ring on the spigot side because it is not possible to know which part of the rubber ring will contact the uneven surface of the insertion end of the synthetic resin tube It seems to be.

On the inner peripheral surface of the rubber ring g, a spiral groove m provided on the outer peripheral surface of the synthetic resin pipe p along the circumferential direction and a concavo-convex surface o conforming to the shape of the ridge t are provided. The uneven surface o is bonded to the surface of one end of the synthetic resin pipe p via an adhesive n such as butyl rubber, which is sticky.

[0005] When the spigot s of the synthetic resin pipe p is inserted straight into the receiving port and a large force is applied so as to flatten the joint, almost good watertightness is obtained. can get. However, when the spigot s is inserted into the receiving port so that the pipe axis is inclined, or when a large bending load is applied to the joint portion and the port is deformed to some extent,
In some cases, the rubber ring g was twisted or displaced, so that water tightness could not be maintained.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a rubber ring mounted on one end of a synthetic resin tube having at least one of a groove and a ridge on an outer peripheral surface in a circumferential direction is formed in a receiving port without being twisted or displaced. The purpose of the present invention is to provide a connection portion of a synthetic resin pipe which can be connected to the tubing with good watertightness.

[0007]

According to the present invention, a rubber ring is mounted along the circumferential direction on the outer circumferential surface at one end of a synthetic resin pipe having at least one of a groove and a ridge on the outer circumferential surface. A connecting member of a synthetic resin pipe having a spigot formed therein, and a support member that does not protrude outward from the rubber ring on both sides of the rubber ring of the spigot supports a side surface of the rubber ring. It is a connection part of the synthetic resin pipe provided as follows.

In the present invention, examples of the synthetic resin forming the synthetic resin tube include polyolefins such as polyethylene and polypropylene, and rigid polyvinyl chloride. As the synthetic resin tube, a tube having a groove, a ridge, or both along the circumferential direction on the outer peripheral surface is used.
The groove, the ridge, or both may be provided spirally along the circumferential direction, or a plurality of grooves, ridges, or both may be provided in parallel so as to be parallel to a plane perpendicular to the tube axis.

In the present invention, the material of the support member is
It can be appropriately selected as long as it has a performance of preventing the rubber ring from being twisted or displaced.For example, when the material of the synthetic resin tube is polyethylene, it may be polyethylene, A thin iron plate coated with polyethylene may be used.

The height of the support member is naturally smaller than the inner diameter of the socket into which the spigot is inserted, so that it does not hinder the insertion. It is also necessary that the height of the rubber ring does not protrude outward and that the rubber ring is prevented from being twisted or displaced. As a guide, the height is preferably about 2/3 of the height of the rubber ring.

The support member needs to be provided so as to support both side surfaces of the rubber ring mounted on the outer peripheral surface of one end of the synthetic resin pipe along the circumferential direction. The supporting member may be a pair of members that separately support both side surfaces of the rubber ring, or may be a unitary member having a substantially U-shaped cross-section in which a concave groove for mounting a rubber ring is provided on an outer peripheral surface in a circumferential direction. May be used.
Further, the overall shape may be an annular body or a shape that can be formed into an annular body by combining split pieces.

It is preferable that the inner peripheral surface of the support member is provided with an uneven surface conforming to the shape of at least one of a groove and a ridge provided on the outer peripheral surface of the synthetic resin pipe along the circumferential direction.

[0013]

The connecting portion of the synthetic resin pipe according to the present invention is provided on both sides of the rubber ring of the spigot so as to support the side surface of the rubber ring so as not to protrude outward from the rubber ring. The rubber ring can be twisted or displaced even if the pipe shaft is inserted into the socket so as to be inclined or if the joint is deformed to some extent due to a large bending load. And the watertightness of the rubber ring can be maintained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an example of the synthetic resin tube of the present invention. P is a synthetic resin pipe having shallow grooves 11 and ridges 12 alternately on its outer peripheral surface along the circumferential direction.

A rubber ring 14 is attached to the outer peripheral surface of one end of the synthetic resin pipe P along the circumferential direction via an adhesive 13 such as butyl rubber. On the inner peripheral surface of the rubber ring 14, a shallow groove 11 formed along the outer peripheral surface of the synthetic resin pipe P and an uneven surface conforming to the ridge 12 are formed. There is no gap between the surface. On the outer peripheral surface of the rubber ring 14, three seal portions having a rectangular cross section along the circumferential direction are formed.

On the outer peripheral surface of one end of the synthetic resin pipe P on which the rubber ring 14 is mounted, on both sides of the rubber ring 14, support members 15 and 15 composed of a pair of annular bodies are provided.
4 are fixed so as to support both side surfaces thereof, and a spigot 1 is formed by these. The inner peripheral surfaces of the support members 15 are formed in a shallow groove 1 formed along the outer peripheral surface of the synthetic resin pipe P.
1 and the ridges 12 are provided. The height of the support member 15 is smaller than the inner diameter of the receiving port (not shown), and is about の of the height of the rubber ring 14. As a means for fixing the outer peripheral surface of the synthetic resin tube P of the support member 15, an adhesive or a pressure-sensitive adhesive may be used, or welding may be used.

When the spigot 1 is inserted into a socket (not shown) so that the pipe axis is inclined, or when a large bending load is applied to the joint, the spigot 1 is deformed to some extent. Since the surfaces are supported by the support members 15, 15, the rubber ring 14 is not twisted or displaced, and the watertightness of the rubber ring 14 can be maintained.

FIG. 2 is a sectional view showing another example of the synthetic resin pipe of the present invention. In the case of this example, a member formed of an integral annular body having a substantially U-shaped cross section in which a concave groove 251 for mounting the rubber ring 24 is provided in the circumferential direction is used as the support member 25.

A support member 25 is attached to the outer peripheral surface of one end of the synthetic resin pipe P similar to that shown in FIG. 1 via a sticky adhesive 23 such as butyl rubber along the circumferential direction. I have. The inner peripheral surface of the support member 25 is an uneven surface that matches the shallow groove 11 and the ridge 12 formed along the outer peripheral surface of the synthetic resin pipe P. There is no gap between them.

A rubber ring 24 is mounted in the concave groove 251 of the support member 25 along the circumferential direction via an adhesive, so that the spigot 2 is formed. Both sides of the rubber ring 24 are
Are supported by both sides. Rubber ring 2
On the outer peripheral surface of 4, there are formed three seal portions having a rectangular cross section along the circumferential direction.

Even when the spigot 2 is inserted into a socket (not shown) so that the pipe axis is inclined, or when a large bending load is applied to the joint, the spigot 2 is deformed to some extent. Since the surface is supported by both sides of the support member 25, the rubber ring 24 is not twisted or displaced, and the watertightness of the rubber ring 24 can be maintained.

FIG. 3 is a sectional view showing still another example of the synthetic resin pipe of the present invention. In the case of this example, a rubber ring 34 having three seal portions having a triangular cross section along the circumferential direction is used. Otherwise, the configuration is the same as that described with reference to FIG. 1, and therefore only the corresponding drawing number is attached and the detailed description is omitted.

[0023]

The connecting portion of the synthetic resin pipe of the present invention is as described above, so that the synthetic resin pipe connected in the receiving port has at least one of the groove and the ridge along the circumferential direction on the outer peripheral surface. Even if it has one, the rubber ring attached to one end thereof can be connected to the inside of the receptacle with good watertightness without being twisted or displaced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a connecting portion of a synthetic resin tube of the present invention.

FIG. 2 is a cross-sectional view showing another example of the connecting portion of the synthetic resin pipe of the present invention.

FIG. 3 is a cross-sectional view showing still another example of the connecting portion of the synthetic resin tube of the present invention.

FIG. 4 is a sectional view showing an example of a conventional rubber ring joint.

FIG. 5 is a cross-sectional view showing an example of a connection portion of a conventional synthetic resin tube.

[Explanation of symbols]

 P synthetic resin pipe 1,2,3 spout 11 groove 12 ridge 14,24,34 rubber ring 15,25,35 support member

Claims (1)

[Claims] 1. A synthetic resin pipe in which a rubber ring is attached along the circumferential direction to an outer circumferential surface at one end of a synthetic resin pipe having at least one of a groove and a ridge along the circumferential direction on the outer circumferential surface. A connecting portion of the resin pipe, a support member not protruding outward than the rubber ring is provided on both sides of the rubber ring of the spout so as to support the side surface of the rubber ring. Characteristic connection part of synthetic resin pipe.