JPH1130373A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee a slantly moving property and excellent water stop property across a long term by mounting a spacer elastic body with a lower hardness than that of a rubber packing in a clearance between the receiving port and insertion port of the inside of the rubber packing. SOLUTION: A rubber packing 2 is stuck to the inner surface of a receiving port 1 molded by a plastic by an adhesive and a spacer elastic body 3 is provided on the back of the rubber packing 2. The hardness of the spacer elastic body 3 is made lower than that of the rubber packing 2. Thereby, the slantly moving property can be held stably by preventing the pile of the solid body in a dirty water to the clearance between the receiving port 1 and insertion port 5 of the more inside than the rubber packing 2. Even if the insertion port 5 is slanted for the receiving port 1, sufficient water stop property can be held by approaching the width center position of the rubber packing 2 to the fulcrum position of the slant.

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 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, relaxation of the bending moment can be expected. However, in this pipe joint, there is a gap between the receiving port and the insertion port on the back side of the waterproof rubber ring, and solid matter in the sewage accumulates in this gap. And there is a fear that effective relaxation of the bending moment cannot be achieved.

Conventionally, as shown in FIG. 4, in a receiving / inserting type pipe joint, a rubber ring 2 'is inserted into a gap between the receiving and inserting opening on the back side of the waterproof rubber ring 2'. It is known to mount a high hardness elastic body 3 ′ having a high hardness (Japanese Utility Model Publication No. 61-61).
618).

[0005]

However, in this pipe joint, since the high hardness elastic body 3 'is displaced in the length direction with respect to the water-stop rubber ring 2', the insertion port 5 '.
Is inclined, the fulcrum x of the inclination deviates from the waterproof rubber ring 2 ′. For example, in the case of the inclination shown by the dotted line in FIG. 4, the contact surface pressure of the upper half surface of the waterproof rubber ring 2 ′ decreases, A decrease in the water stoppage of the ring 2 'is inevitable.

Therefore, it is difficult to sufficiently maintain the water stopping of the water stopping 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
It is an object of the present invention to provide a pipe joint in which a rubber packing is attached to a clearance between a receiving port and an insertion port, and which can guarantee tiltability and excellent water stoppage for a long time.

[0007]

A pipe joint according to the present invention comprises:
In a fitting where a rubber packing is attached to the clearance between the receiving port and the insertion port, a spacer elastic body having a lower hardness than the above rubber packing is attached to the clearance between the receiving port and the insertion port on the back side of the rubber packing. The inner surface of the spacer elastic body can be formed as a taper protruding surface having a smaller inner diameter of the spacer elastic body toward the middle of the inner surface, and a stopper for the front end of the insertion hole can be formed. An elastic body can be provided at the back of the receptacle;

[0008]

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, and FIG. 1 (B) shows a state after an insertion port is inserted. Each 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 rubber packing fixed to the inner surface of the receiving port 1 with an adhesive, and a lip portion 21 protrudes from the middle of the inner surface. Numeral 3 is a spacer elastic body provided behind the rubber packing 2 in the socket 1 and 4 is a stopper elastic body fixed behind the spacer elastic body 3 to an inner portion of the socket 1 with an adhesive. is there. Reference numeral 5 denotes an opening.

The rubber packing 2 and the stopper elastic body 4 are fixed to the inner surface of the receiving port 1 by an adhesive, and the spacer elastic body 3 is sandwiched between them. Can also be fixed to the inner surface of the receptacle with an adhesive. Further, respective mounting grooves for the rubber packing 2, the spacer elastic body 3, and the stopper elastic body 4 are formed on the inner surface of the receiving port,
Each can be mounted in each mounting groove.

The spacer elastic body 3 is designed such that even if the insertion port 5 is inserted obliquely into the receptacle 1, the insertion port 5 can be inserted concentrically into the receptacle 1 by itself. A taper surface 31 for guiding the tip 51 (taper angle is, for example, 22 ° to 24 °)
°). The hardness of the spacer elastic body 3 is lower than the hardness of the rubber packing 2. For example, while the hardness Hs of the rubber packing 2 is 60 degrees, the hardness of the spacer elastic body 3 is Hs = 25 to It is 40 degrees. Also,
A concave portion is formed between the taper guide surface 31 of the spacer elastic body 3 and the inner surface of the rear part of the rubber packing 2 with the reverse taper surface 22 (the taper angle is, for example, about 20 °). The contact friction surface for insertion of the insertion port 5 is reduced to facilitate insertion of the insertion port.

The stopper-elastic body 4 has an insertion end 51.
The spacer elastic body 3
The tapered front surface 41 is brought into contact with the front end 51 of the insertion opening 5 centered in the above. The stopper - the hardness Hs of the elastic body 4 the space - Yes made higher than the hardness of the support elastic body 3, for the hardness H ₀ of the rubber packing 2, Hs = (H ₀ +10
Degrees) to (H ₀ -10 degrees). For example, the hardness Hs of the rubber packing 2 is 60 degrees, the hardness Hs of the spacer elastic body 3 is 35 degrees, and the hardness Hs of the stopper elastic body 4 is Hs = It can be 60 degrees. The angle of the taper front surface 41 of the stopper-elastic body 4 is set according to the chamfer angle of the insertion tip 51. For example, when the chamfer angle of the insertion tip 51 is 15 °, the stopper-elastic body 4 The angle of the taper front surface 41 can be 30 ° to 45 °. With respect to the taper front surface 41 of the stopper elastic body 4, the inner surface of the rear half of the spacer elastic body 3 is connected to the reverse taper surface 32 (the taper angle is, for example, 22 ° to 24 °).
°) to form a recess between the two to reduce the contact friction surface for insertion of the insertion port 5 to facilitate insertion of the insertion port. The rear end of the stopper elastic body 4 and the front end of the spacer elastic body 3 correspond to a step surface 33 provided on the inner surface of the front half of the spacer elastic body 3 and the protruding rear end of the stopper elastic body 4. 42.

In the pipe joint according to the present invention, the insertion port 5 can be easily inserted concentrically with the receiving port 1 with a relatively small insertion force. The pipe joint according to the present invention is not limited to the above-described connection between the mounting pipe branch pipe and the mounting pipe, but also includes a connection between a connection pipe mounted on a manhole or a box with mortar or the like and a drain pipe, and a connection between drain pipes. Can also be used.

In the pipe joint according to the present invention, even under such use, the spacer elastic body 3 is attached to the clearance between the receiving port and the insertion port on the back side of the rubber packing 2 to close the clearance. Therefore, it is possible to eliminate the accumulation of the solid matter in the sewage in the clearance, and to stably maintain the tiltability between the receiving port and the insertion port. FIG. 2 shows a state in which the insertion port 5 is inclined with respect to the receptacle 1. The reaction force of the spacer elastic body 3 with respect to the inclination is because the hardness of the spacer elastic body 3 is low and the Young's modulus is small. In the embodiment, as shown in FIG. 1, the inner surface of the spacer elastic body 3 has a taper projecting surface so that the reaction force can be reduced in terms of shape. The reaction force of the stopper-elastic body 4 is also small since the stopper-elastic body 4 hardly catches against the tilting of the insertion end 51 and the projection 42 compresses the low-hardness spacer elastic body 3 and is easily deformed. Therefore, the reaction force state with respect to the inclination of the insertion hole is similar to the case where only the rubber packing 2 is used without the spacer elastic body 3 and the stopper elastic body 4, and the width center position of the rubber packing 2 is set to the fulcrum position of the inclination. Of the rubber packing accompanying the inclination of the slot 5 Can sufficiently suppress the variation of the reduced state can be maintained satisfactorily the water cut of the rubber packing 2 despite the inclination of the spigot 5.

Note that the angle of inclination of the opening is + α ° to −α.
°, packing 2 as shown in FIG.
It is preferable to form a tapered surface a having an angle α ° that spreads forward on the inner surface of the front end portion of the substrate, and this α ° is generally set to approximately 10 °. As described above, although the hardness of the spacer elastic body 3 is considerably reduced, the hardness of the stopper elastic body 4 is made higher than the hardness of the spacer elastic body 3. 4 is well resistant to entry of the insertion tip 51, and the positioning of the insertion tip 51 can be easily performed.

In the pipe joint according to the present invention, since the spacer elastic body 3 is compressed and deformed by the inclination of the insertion port 5 with respect to the receiving port 1, the bending mode at the time of the earthquake due to the buffering action accompanying the deformation.
Can alleviate or absorb the element. Also, the stopper elastic body 4 is elastically deformed by the insertion of the insertion end 51 against the compressive force acting on the insertion port 5 during an earthquake. The axial compression force can be reduced or absorbed. Therefore, sewer pipeline damage during an earthquake, for example,
The detachment due to the bending of the mounting pipe, the protrusion into the main pipe due to the compression of the mounting pipe, and the breakage of the fixed portion between the mounting branch pipe and the main pipe can be satisfactorily prevented.

In the stopper-elastic body in the above embodiment, as shown in FIG. 1, in order to adjust the elastic stress of the stopper-elastic body with respect to the insertion of the insertion tip,
A constricted portion 43 is formed on the front and rear surfaces, and it is effective to increase the constricted portion 43 as the hardness of the stopper-elastic body 4 increases. In the present invention, rubber is usually used for the spacer elastic body 3 and the stopper elastic body 4. However, plastic having elasticity can be used, and a foam such as sponge rubber is used for the spacer elastic body. Can also be used.

The spacer elastic body and the stopper elastic body are usually formed integrally with the ring body.
It is also possible to attach a string body having a circumference length slightly longer than the inner periphery of the receptacle, in a ring shape, and compressed in the peripheral direction in the receptacle.
In the present invention, as shown in FIG. 3, the rubber packing 2 is made of a high hardness elastic body 2a having an annular groove 21a provided in the center of the inner surface thereof and having a waterproof rubber ring 2b mounted on the annular groove 21a. You can also. In this packing, the rubber hardness of the waterproof rubber ring 2b (normally Hs = 50 to 55)
), The rubber hardness of the high-hardness elastic body 2a is increased, for example, the rubber hardness Hs of the water-stop rubber ring 2b is 50
The rubber hardness Hs of the high hardness elastic body 2a is set to 60 degrees with respect to the degree, and the hardness of the rubber packing is evaluated by compression in the thickness direction.

In a pipe joint using this rubber packing, even if a relatively vertical load acts on the insertion side due to backfilling earth pressure or consolidation settlement of the buried earth and sand, the high hardness elastic body is not affected by the vertical load. , It is possible to prevent uneven deformation of the waterproof rubber ring.

[0020]

In the pipe joint according to the present invention, a spacer elastic body having a lower hardness than the rubber packing is attached to the clearance between the receiving port and the insertion port on the back side of the rubber packing. Prevents solids from accumulating in the clearance in the sewage and stabilizes the tiltability of the pipe joint.Even if the insertion port is tilted with respect to the socket, the reaction force of the spacer elastic body to the tilt is small. Since it is small, the center position of the width of the rubber packing and the position of the fulcrum of its inclination are sufficiently close to each other, so that the compressed state of the rubber packing can be well maintained at the state where there is no inclination.

Therefore, according to the present invention, the tilting property can be guaranteed for a long time, sufficient waterproofness can be maintained even in a tilted state, and the bending moment and the compressive force in the pipe axial direction at the time of an earthquake can be relaxed and absorbed well. An earthquake-resistant pipe joint can be provided.

[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 cross-sectional view showing another example of the packing used in the pipe joint according to the present invention.

FIG. 4 is a drawing showing a conventional example.

[Explanation of symbols]

 1 Receiving port 2 Packing 3 Spacer elastic body 4 Stopper elastic body 5 Insert

Claims (3)

[Claims] In a pipe joint having a rubber packing attached to a clearance between a receiving port and an insertion port, a spacer elasticity having a hardness lower than that of the rubber packing is provided in a clearance between the receiving port and the insertion port on the back side of the rubber packing. A pipe fitting characterized by having a body attached. 2. The pipe joint according to claim 1, wherein the inner surface of the spacer elastic body is a taper projecting surface in which the inner diameter of the spacer elastic body decreases toward the middle of the inner surface. 3. The pipe joint according to claim 1, wherein a stopper-elastic body for the distal end of the insertion port is provided in a deep portion of the receiving port.