JPH09264472A - Pipe body made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe (or pipe joint) made of a synthetic resin in which the opening end part of a diameter expanded receiver is not broken at the outer surface of a synthetic resin pipe, even if an external load like an earth pressure and wheel load acts on a pipeline. SOLUTION: In a pipe joint 1 made of a hard polyvinyl chloride resin connected by inserting the end insertion port of a hard polyvinyl chloride resin pipe 5 in this diameter expanded receiver 4, in which a ring shape recessed groove 3 is installed in the peripheral direction of the inner surface of a diameter expanded receiver 4 and a rubber ring 2 for seal is mounted in this ring shape recessed groove 3, a short cylinder shape stress absorption layer 23 made of a synthetic rubber is installed on the entire surface of the peripheral direction of the opening end inner surface of the diameter expanded receiver 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin of a so-called rubber ring connection type, which is used in a synthetic resin pipe line such as a water supply, a cable protection pipe, a sewage or a hard vinyl chloride resin pipe in the drainage field of a residential land. Regarding pipe making (or pipe fittings).

[0002]

2. Description of the Related Art A conventional rubber ring connection type synthetic resin pipe joint 1a, as shown in FIG. 4, includes an expanded diameter receiving port 4a having a rubber ring receiving portion 3a for receiving a sealing rubber ring 2a,
By inserting the spigot of the pipe 5a to be joined into the expanded diameter receiving port 4a, the rubber ring 2a seals between the outer surface of the spout of the pipe 5a and the inner surface of the expanded diameter receiving port 4a. (See, for example, JP-A-6-346989).

It should be noted that the inner diameter of the expanded diameter receiving port 4a on the inner side of the rubber ring receiving portion 3a is a so-called hip-up structure in which the diameter is slightly increased toward the inner side. When a bending load is applied to the pipe 5a inserted into and connected to the pipe 5a, the end of the pipe 5a inside the expanded diameter receiving port 4a does not come into contact with the inner surface of the expanded diameter receiving port 4a.

[0004]

By the way, when the synthetic resin pipe joint 1a is used in a sewer pipe, when an external load such as earth pressure or wheel load acts on the pipe, a bending load is applied to the pipe 5a. Will work. Then, as shown in FIG. 5, the outer surface of the pipe 5a comes into contact with the inner surface of the opening end portion of the expanded diameter receiving port 4a and is pushed and expanded to open the opening end portion 41 of the expanded diameter receiving port 4a.
a is damaged. As a result, water invades into the pipeline through the damaged part, increasing the amount of wastewater treated at the sewage treatment plant at the end and blocking the pipeline due to the entry of mud, sand, and pebbles. there were.

The present invention is intended to solve the above-mentioned conventional problems, and an object of the present invention is to make the opening end portion of the expanded diameter receiving port contact the pipe outer surface even if an external load acts on the pipe line. (EN) Provided is a synthetic resin tube body which is not damaged by damage.

[0006]

According to a first aspect of the present invention, there is provided a synthetic resin pipe body, wherein an annular groove is provided in a circumferential direction of an inner surface of a diameter-enlarging port, and the annular rubber groove is used for sealing. In the synthetic resin pipe body in which the end opening of the synthetic resin pipe is inserted into and connected to the expanded diameter receiving port, the rubber stress is applied to the entire inner surface of the opening end of the expanding diameter receiving port in the circumferential direction. An absorption layer is provided.

The tubular body in the present invention may be in any form such as a pipe or a pipe joint as long as it is made of synthetic resin.

(Operation) In the synthetic resin pipe body of the present invention as set forth in claim 1, the entire circumferential surface of the inner surface of the opening end of the expanded diameter receiving opening provided with the annular concave groove into which the rubber ring for sealing is mounted. Since a rubber-made stress absorption layer is provided, the outer surface of the synthetic resin pipe inserted into and connected to the diameter expansion receiving port tries to push the diameter expansion receiving port by contacting the inner surface of the opening end. Stress is
It is absorbed and relaxed by the stress absorption layer. Therefore, the opening end of the expanded diameter receiving port is not damaged and is protected by the presence of the stress absorption layer.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a first embodiment of the synthetic resin pipe joint of the present invention together with a use state, and FIG. 2 is an explanatory sectional view showing a state in which a bending load is applied in FIG.

In the figure, reference numeral 1 denotes a pipe joint made of a hard vinyl chloride resin, and an annular groove 3 having a substantially semicircular cross section is provided so as to bulge on the inner peripheral surface near the opening end of the expanded diameter receiving port 4. A rubber ring 2 for sealing made of synthetic rubber is mounted in the annular groove 3. The rubber ring 2 for sealing is composed of a mounting portion 21, a fin-shaped sealing portion 22, and a short cylindrical portion 23. The short cylindrical portion 23 is integrally formed on the opposite side of the seal portion 22 to the opening end side of the diameter expansion receiving port 4. The short cylindrical portion 23 is a stress absorbing layer, and has a function of absorbing and relaxing a bending load applied to a hard vinyl chloride resin pipe 5 to be connected, which will be described later.

Next, the operation of the pipe joint 1 will be described. As shown in FIG. 2, a bending load acts on the hard vinyl chloride resin pipe 5 inserted and connected in the expanded diameter receiving port 4, and the outer peripheral surface of this resin pipe 5 is the inner circumference of the opening end of the expanded diameter receiving port 4. Abut the surface,
Even if the opening end is widened, the stress that attempts to widen the expanded diameter receiving port 4 is absorbed by the stress absorbing layer 23 and relieved, and damage to the opening end portion of the expanded diameter receiving port 4 is prevented. .

FIG. 3 is a longitudinal sectional view showing a second embodiment of the synthetic resin pipe joint of the present invention together with the state of use. As shown in the drawing, a large-diameter portion 6 is provided on the inner surface of the opening end of the expanded-diameter receiving port 4, and a narrow ring-shaped stress absorption layer 23a separate from the sealing rubber ring 2 is bonded to the large-diameter portion 6. It is basically the same as the first embodiment except that it is fixed.

Also in this case, as in the first embodiment, even when a bending load is applied to the hard vinyl chloride resin pipe 5, the stress for expanding the expanded diameter receiving port 4 is absorbed by the stress absorbing layer 23a. -It is alleviated and damage to the opening end of the expanded diameter receiving port 4 is prevented. Further, since the stress absorbing layer 23a can be attached separately from the sealing rubber ring 2, workability is good.

[0014]

In the synthetic resin pipe body according to the present invention as set forth in claim 1, since the rubber stress absorbing layer is provided on the entire inner surface in the circumferential direction of the inner surface of the opening end of the diameter expansion receiving port, the diameter expansion receiving member is provided. The stress of the synthetic resin pipe inserted into the mouth and connected to the inner surface of the opening end to spread the expansion port is absorbed and relaxed by the stress absorption layer. Damage to the ends is prevented. Therefore, water does not enter the pipeline, the treatment amount at the terminal sewage treatment plant does not change, and the pipeline is not blocked.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention in a partial cross section and a usage state.

FIG. 2 is an explanatory diagram showing a state in which a bending load is applied in FIG.

FIG. 3 is a front view showing a second embodiment of the present invention in a partially sectioned state together with a state of use.

FIG. 4 is an explanatory view showing a conventional synthetic resin pipe joint together with a use state.

5 is an explanatory view showing a state in which a bending load is applied to the synthetic resin pipe joint of FIG.

[Explanation of symbols]

 1 Hard Vinyl Chloride Resin Pipe Joint 2 Seal Rubber Ring 21 Mounting Part 22 Sealing Part 23, 23a Stress Absorbing Layer 3 Annular Ditch 4 Expanding Port 5 Hard Vinyl Chloride Resin Pipe

Claims (1)

[Claims] 1. A ring-shaped groove is provided in a circumferential direction of an inner surface of the diameter-enlarged receiving port, and a rubber ring for sealing is attached to the ring-shaped groove, and an end portion of a synthetic resin pipe is inserted into the diameter-enlarging port. In a synthetic resin pipe body to be inserted and connected, a synthetic resin pipe body is provided with a rubber stress absorption layer on the entire inner surface in the circumferential direction of the inner surface of the opening end of the expanded diameter receiving port.