JPH1130371A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the water stop property of a water stop rubber ring for the inclination of an insertion port sufficiently by mounting the water stop rubber ring between the intermediate part of the inner surface of an elastic body with a higher hardness than the water stop rubber ring mounted in the clearance between a receiving port and insertion port and the insertion port. SOLUTION: A water stop rubber ring 3 is mounted on the center part of the inner surface of a high hard elastic body 2 stuck by an adhesive to the inner surface of a receiving port 1 molded by a plastic. The rubber hardness of the high hard elastic body 2 is made higher than the water stop rubber ring 3. The insertion port 4 made of plastic is inserted in the receiving port 1. The high hard elastic body 2 is mounted in a compression state in the clearance between the receiving port 1 and insertion port 4 and also the water stop rubber ring 3 between the intermediate part of the inner surface of the high hard elastic body 2 and the insertion port 4 and such state that the high hard elastic body 2 is contacted with the outer surface of the insertion port 4 at both sides of the water stop rubber ring 3 is made. As a vertical load P exerted to the insertion port 4 side is supported by the high hard elastic body 2, the ununiform deformation of the water stop rubber ring 3 is prevented and the water stop of the water stop rubber ring 3 can be held favorably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and particularly useful as a pipe joint for sewage.

[0002]

2. Description of the Related Art In order to branch-connect a mounting pipe to a main pipe of a sewer pipe, a mounting pipe branch pipe is fixed to the main pipe at a saddle portion, and a mounting pipe opening is joined to a receiving port of the mounting pipe branch pipe. In order to join the receiving port and the insertion port, usually, a method is used in which a water-stop rubber ring is attached to an annular groove on the inner surface of the reception port, and the water-stop rubber ring is compressed by inserting the insertion port.

During an earthquake, an underground object receives seismic waves, and in the above-mentioned sewage pipeline, the action of bending moment on the joint between the inlet and the outlet is inevitable.・
Since the opening can be tilted within a certain angle range, the bending moment can be reduced, which is advantageous in terms of earthquake resistance. In order to widen the tiltable angle range between the receiving port and the insertion port, it is effective to increase the inner diameter of the receiving port and increase the clearance between the receiving port and the insertion port.

However, the hardness Hs of the waterproof rubber ring is
Is usually about 60 degrees, and if the clearance is large, the position in the receiving port of the insertion hole will be eccentric due to backfilling earth pressure received by the mounting pipe or consolidation settlement of the buried soil, etc. A reduction in water stoppage due to uneven deformation is inevitable. If the hardness of the waterproof rubber ring is increased in order to prevent uneven deformation of the waterproof rubber ring due to the backfilling earth pressure or the like, elastic deformation becomes less likely to occur, and the water stopping property of the waterproof rubber ring itself from such a surface. It has to be reduced.

Conventionally, as shown in FIG. 5, a high hardness elastic body 2 having a higher hardness than the rubber ring is provided at the back side of the rubber ring 3 'as shown in FIG. It is known to mount '(Japanese Utility Model Publication No. 61-618).

[0006]

In the pipe joint shown in FIG. 5, since the high hardness elastic body 2 'is displaced in the length direction with respect to the water-stop rubber ring 3', the insertion hole 4 is not provided. When the 'is tilted, the fulcrum x of the tilt is shifted from the waterproof rubber ring 3'. For example, in the case of the tilt shown by the dotted line in FIG. 5, the contact surface pressure of the upper half surface of the waterproof rubber ring 3 'is reduced and the water is stopped. It is inevitable that the waterproofness of the rubber ring 3 'is reduced.

[0007] Therefore, it is difficult to sufficiently maintain the water stoppage of the water-stop rubber ring when the insertion port is tilted with respect to the reception port during an earthquake or when the insertion port is joined to the reception port at a certain angle. The purpose of the present invention is
In a pipe joint that joins the receiving port and the insertion port via a waterproof rubber ring, a high hardness elastic body is used to prevent uneven deformation of the waterproof rubber ring caused by backfilling earth pressure and consolidation settlement of buried soil. It is an object of the present invention to provide a pipe joint that can sufficiently maintain the water stoppage of the water stop rubber ring with respect to the inclination of the insertion port even when the pipe joint is used.

[0008]

A pipe joint according to the present invention comprises:
A high hardness elastic body is attached to the clearance between the receiving port and the insertion port, and a waterproof rubber ring is mounted in a compressed state between the middle portion of the inner surface of the high hardness elastic body and the insertion port, and the high hardness elastic body is water stopped. The hardness of the high hardness elastic body is higher than the hardness of the waterproof rubber ring by contacting the outer surface of the insertion hole on both sides of the rubber ring. A ring mounting groove is provided, and a waterproof rubber ring can be mounted in this groove.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing an example of a pipe joint according to the present invention. FIG. 1 (A) shows a state before an insertion port is inserted into a receptacle, and FIG. Each state after insertion is shown.

In FIG. 1, reference numeral 1 denotes a receiving port, which is formed of plastic, for example, vinyl chloride resin. Reference numeral 2 denotes a high hardness elastic body fixed to the inner surface of the receiving port 1 with an adhesive, and an annular groove 21 is provided at the center of the inner surface. Reference numeral 3 denotes a water-stop rubber ring, which has a lip portion 31 and is attached to the annular groove 21 on the inner surface of the high hardness elastic body 2. The rubber hardness of the high hardness elastic body 2 is set higher than the rubber hardness of the waterproof rubber ring 3 (normally, Hs = 50 to 55 degrees). For example, the rubber hardness Hs of the waterproof rubber ring 3 is 50 degrees. On the other hand, the rubber hardness of the high hardness elastic body 2 is set to Hs = 60 degrees. Reference numeral 4 denotes an insertion port made of plastic, for example, a vinyl chloride resin. By inserting the insertion port 4 into the receiving port 1, a high hardness elastic body 2 is provided in a clearance between the receiving port 1 and the receiving port 4, and the high hardness The waterproof rubber rings 3 are mounted in a compressed state between the inner surface intermediate portion of the elastic body 2 and the insertion port 4, and the high hardness elastic body 2 is brought into contact with the outer surface of the insertion port 4 on both sides of the waterproof rubber ring 3. is there.

[0011] The pipe joint according to the present invention, in addition to the above-described connection between the mounting pipe branch pipe and the mounting pipe, the connection between the connecting pipe and the sewage pipe mounted on a manhole or a box with mortar or the like, and the sewage pipe. It can also be used for joining together. In such a use, as shown by W in FIG. 1B due to backfilling earth pressure or consolidation settlement of buried earth and sand, even if a vertical load W acts relatively on the insertion port 4 side, a high hardness elastic body is used. 2 supports the vertical load P, so that non-uniform deformation of the waterproof rubber ring 3 can be prevented, and the waterproofness of the waterproof rubber ring 3 can be maintained well.

Further, as shown in FIG. 2, even when the insertion port 4 is inclined with respect to the receiving port 1, the water-stopping rubber ring 3 is located substantially at the center of the high hardness elastic body 2, and the water-stopping rubber ring position Is located at the fulcrum position of the inclination, so that the compression state of the waterproof rubber ring 3 can be prevented from fluctuating due to the inclination of the insertion opening 4, and the water stopping rubber ring 3 can be removed regardless of the inclination of the insertion opening 4. Water stoppage can be kept good. Further, the bending moment acting during an earthquake can be alleviated or absorbed by the relative tilt of the insertion port with respect to the receiving port, thereby preventing breakage of the pipeline, and in this case, under the inclination of the insertion port. Sewage leakage can be prevented to maintain the water stoppage.

FIG. 3 is a view showing another example of the pipe joint according to the present invention. FIG. 3 (A) shows a state before an insertion is inserted into a receptacle, and FIG. 3 (B) shows a receptacle. 3 shows a state after the insertion of the insertion hole. In FIG. 3, reference numeral 1 denotes a receiving port, 3 denotes a waterproof rubber ring, and 2 denotes a high hardness elastic body having a higher hardness than the waterproof rubber ring 3.

Reference numeral 5 denotes a centering spacer elastic body provided on the inner surface of the receiving port 1 behind the high hardness elastic body 2, and reference numeral 6 denotes a centering spacer provided on the inner surface of the receiving port 1 behind the elastic body 5. Stopper-elastic body. The high hardness elastic body 2 and the stopper elastic body 6 are fixed to the inner surface of the socket 1 with an adhesive, and the centering spacer elastic body 5 is sandwiched between them. The elastic body 5 can also be fixed to the inner surface of the receiving port with an adhesive. For the high hardness elastic body, the centering spacer elastic body and the stopper elastic body, a mounting groove for each of them can be formed on the inner surface of the receiving port, and each can be mounted on each mounting groove.

In the centering spacer elastic body 5,
Even if the insertion port 4 is inserted obliquely into the receiving port 1, the front end 51 of the insertion port 41 is tapered (taper angle is, for example, 22 °).
(〜24 °) so that the insertion port 4 can be inserted into the reception port 1 concentrically. The hardness of the centering spacer elastic body 5 is lower than the hardness of the high hardness elastic body 2. For example, when the hardness Hs of the high hardness elastic body 2 is 60 degrees, the centering spacer elastic body 5 is hardened. Hardness of Hs = 25-40
There is as a degree. The inner surface of the rear portion of the high hardness elastic body 2 is tapered in reverse with respect to the taper guide surface 51 of the centering spacer elastic body 5.
A concave portion is provided between the both surfaces 22 (the taper angle is, for example, about 20 °) to reduce a contact friction surface for insertion of the insertion hole 4 to facilitate insertion of the insertion hole.

The stopper elastic body 6 is provided for positioning the insertion tip 41, and is a tape that the tip 41 of the insertion hole 4 centered by the centering spacer elastic body 5 contacts. The front surface 61 is provided. The hardness Hs of the stopper-elastic body 6 is preferably Hs = (H ₀ +10 degrees) to (H ₀ -10 degrees) with respect to the hardness H ₀ of the high-hardness elastic body 2. Hardness Hs of body 2 = 6
For 0 degree, the hardness of the stopper-elastic body 6 is Hs = 50 to
Preferably it is 70 degrees. This stopper-elastic body 6
The angle of the taper front surface 61 is set according to the chamfer angle of the insertion tip 41. For example, the chamfer angle of the insertion tip 41 is 15 degrees.
In the case of °, the angle of the taper front surface 61 of the stopper elastic body 6 can be set to 30 ° to 45 °. With respect to the taper front surface 61 of the stopper elastic body 6, the inner surface of the rear half of the centering spacer elastic body 5 is formed into an inverted taper surface 52 (taper angle is, for example, 22 ° to 2 °).
4 °), a recess is formed between the two, and the contact friction surface for insertion of the insertion hole 4 is reduced to facilitate insertion of the insertion hole.

The rear end portion of the stopper elastic body 6 and the front end portion of the centering spacer elastic body 5 correspond to a step surface 53 provided on the inner surface of the front half of the centering spacer elastic body 5 and the stopper. The elastic body 6 is locked with the protruding rear end portion 62. In the above-described pipe joint, the insertion port 4 can be easily inserted into the reception port 1 concentrically with the reception port with a relatively small insertion force. The water stopping performance of this pipe joint is mainly given by the compression of the water stopping rubber ring 3, but the contact interface between the high hardness elastic body 2 and the insertion port 4 also contributes to the water stopping performance as a secondary effect. As shown in (b), the width of the high hardness elastic body 2 is (1/1) between the width W of the high hardness elastic body 2 between the inner tapered surface 22 on the rear part of the high hardness elastic body 2 and the waterproof rubber ring mounting groove 21. 12 to 1 /
6) A seal surface a of W is provided (for example, a width of 60 m).
m, in the case of a high hardness elastic body with a height of 18 mm, width 5 to 10 m
m).

FIG. 4 shows a state in which the insertion opening 4 is inclined in the above another embodiment, and the centering space for the inclination is shown.
The reaction force of the elastic body 5 is small because the hardness is low and the Young's modulus is small, and the reaction force of the stopper-elastic body 6 is also small.
1 is small because the stopper-elastic body 6 is hardly caught by the tilting of 1 and the protrusion 62 is small because the low-hardness centering spacer elastic body 5 is compressed and easily deformed. The state of the reaction force with respect to the centering spacer elastic body 5
2 and the stopper-elastic body 6 is not present, the position of the water-stop rubber ring 3 can fluctuate due to the inclination of the insertion opening 4 because the position of the water-stop rubber ring can be close to the position of the fulcrum of the inclination. Can be kept light, and the waterproofness of the waterproof rubber ring 3 can be favorably maintained irrespective of the inclination of the insertion opening 4.

It is to be noted that the inclination angle of the insertion port is + α ° to −α.
1, and as shown in FIG. 1 (B) and FIG. 3 (B), an angle α ° that spreads forward on the inner surface of the distal end portion of the high hardness elastic body 2.
It is preferable to form a tapered surface b of
Is approximately 10 °. In the pipe joint according to the present invention, since the elastic body such as the high-hardness elastic body or the high-hardness elastic body and the centering spacer elastic body is deformed by the inclination of the insertion port with respect to the socket, the buffering action accompanying the deformation is caused. The bending mode during an earthquake
Can alleviate or absorb the element. In addition, against the compressive force acting on the insertion port during an earthquake, the entry of the insertion port tip is a stopper.
Since the elastic body is elastically deformed, the compressive force in the pipe axial direction at the time of the earthquake can be reduced or absorbed by the buffering action accompanying the deformation.
Accordingly, damage to the sewer pipe during an earthquake, for example, detachment due to bending of the mounting pipe, protrusion into the main pipe due to compression of the mounting pipe, or breakage of the fixed portion between the mounting pipe and the main pipe can be prevented well. .

In the stopper-elastic body 6 in the above embodiment, as shown in FIG. 3, constricted portions are formed on the front and rear surfaces of the stopper-elastic body 6 in order to adjust the elastic stress of the stopper-elastic body with respect to the insertion of the insertion tip. It is effective to increase the constricted portion 63 as the hardness of the stopper-elastic body 6 increases. In the present invention, rubber is usually used for the high hardness elastic body, the centering spacer elastic body, and the stopper elastic body, but plastic having elasticity can also be used. In particular, a foam such as sponge rubber can be used as the centering spacer elastic body.

The high hardness elastic body, the centering spacer elastic body and the stopper elastic body are usually formed integrally with the ring body, but the peripheral length is slightly longer than the inner periphery of the socket. It is also possible to mount the string in a ring shape and compress it in the circumferential direction in the socket.

[0022]

In the pipe joint according to the present invention, a high-hardness elastic body is mounted between the inner surface of the receiving port and the outer surface of the insertion port, and the gap between the inner middle surface of the high-hardness elastic body and the outer surface of the insertion port is provided. Non-uniform deformation of the waterproof rubber ring by supporting the vertical load acting on the opening relatively by the backing earth pressure and the consolidation settlement of the buried soil with the high hardness elastic body Can be prevented well,
In addition, even if the insertion port is relatively inclined with respect to the receiving port, the position of the water-stop rubber ring and the fulcrum of the tilt are brought sufficiently close to each other to change the compression state of the water-stop rubber ring to a state where the tilt is not tilted. Can be well maintained.

Therefore, according to the present invention, it is possible to provide a pipe joint which is excellent in water stopping performance of a water stopping rubber ring, excellent in tilting or flexibility, and is therefore earthquake-resistant.

[Brief description of the drawings]

FIG. 1 is a drawing showing an example of a pipe joint according to the present invention.

FIG. 2 is a drawing showing an inclined state of an insertion opening in the pipe joint of FIG. 1;

FIG. 3 is a drawing showing another example of the pipe joint according to the present invention.

FIG. 4 is a view showing an inclined state of an insertion port in the pipe joint of FIG. 3;

FIG. 5 is a drawing showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving port 2 High hardness elastic body 21 Groove for attaching a water-stop rubber ring 3 Water-stop rubber ring 4 Insert

Claims (2)

[Claims] 1. A high hardness elastic body is attached to a clearance between a receiving port and an insertion port, and a waterproof rubber ring is mounted in a compressed state between a middle portion of an inner surface of the high hardness elastic body and the insertion port. A pipe joint characterized in that an elastic body is brought into contact with an outer surface of an insertion opening on both sides of a water-stop rubber ring, and the high hardness elastic body is higher in hardness than the water-stop rubber ring. 2. The pipe joint according to claim 1, wherein a groove for mounting a waterproof rubber ring is provided at an intermediate portion of the inner surface of the high hardness elastic body.