JP2003129508A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internally fitting pipe joint excellent in workability, having excellent stability without impairing a joint function for the oscillation of earthquake or the like and connecting a sewer to a side wall of a manhole. SOLUTION: The pipe joint comprises a cylindrical body 1 inserting the sewer therein and a flange 2, the cylindrical body 1 comprises the other cylindrical diameter contraction section 3 and a cocentric cylindrical diameter expansion section 4 continued to the contraction diameter section, the circumferential recess groove 6 having a seal-ring 7 is provided to the inside circumference in the vicinity of the front end of the diameter contraction section 3, the flange 2 is integrally provided to the rear end of the cylindrical body 1, and the pipe joint is combined with a manhole 9 on the circumference of the diameter expansion section 4 of the cylindrical body 1 and the cylindrical body side surface of the flange 2 so that it is mounted. A pipe holding ring 10 is inserted between the inside circumference of the diameter expansion section 4 and the circumference of the sewer 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal fitting type pipe joint having excellent stability without damaging the joint function against shaking or vibration due to an earthquake or the like.

[0002]

2. Description of the Related Art Conventional manhole fittings are generally integrated into the manhole by inserting the tip from the outside into a mounting hole formed in the side wall of the manhole and using an adhesive such as mortar or epoxy resin adhesive. Installation, and
When the outer peripheral surface of the pipe joint has a flange, one side surface of the flange is joined and integrated with the outer wall surface of the manhole.

[0003]

However, the pipe joint has a structure in which it is inserted into the mounting hole of the manhole from the outside and attached by an adhesive, and the attachment strength depends exclusively on the adhesive force of the adhesive. Therefore, it cannot be said that the product has sufficient strength against the pressing force, vibration, or pulling force applied to the pipe joint through the sewer pipe due to shaking due to an earthquake, etc., and the manhole mounting portion is connected via the pipe joint. There is a risk that the sewer pipe tilts, the joint function cannot be maintained with the pipe joint, and the pipe joint itself pulls out from the manhole. An object of the present invention is to provide a pipe joint that can cope with such a danger and that has excellent stability that does not impair the joint function against shaking or vibration such as an earthquake.

[0004]

In order to solve the above problems, the pipe joint of the present invention is different from the conventional pipe joint in that it is an internal fitting type in which the manhole is inserted and attached from the inside to the outside. The flange of the joint and part of the pipe joint are joined and integrated with the manhole. That is, the pipe joint of the present invention is composed of a cylindrical main body into which a sewer pipe is inserted and a flange portion, and the cylindrical main body is a concentric cylindrical expanded portion followed by a cylindrical reduced diameter portion. The inner peripheral surface near the tip of the reduced diameter portion is provided with a circumferential groove in which a seal ring is mounted, and the rear end portion of the cylindrical body is integrally provided with a flange portion, The outer peripheral surface of the enlarged diameter portion of the cylindrical main body and the surface of the flange portion on the cylindrical main body side are joined and integrated with the manhole to be attached to the manhole. Also,
A pipe holding ring is inserted between the inner peripheral surface of the expanded diameter portion and the outer peripheral surface of the sewer pipe.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the pipe joint of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view showing an example of the pipe joint of the present invention, and FIG. 2 is A- of FIG.
It is sectional drawing which follows the A arrow line. Further, FIG. 3 is a schematic cross-sectional view showing a mounted state of the pipe joint of the present invention.

As shown in FIG. 2, the pipe joint of the present invention comprises a cylindrical main body 1 and a flange portion 2, and the cylindrical main body 1
Is composed of a forward cylindrical reduced-diameter portion 3 and a concentric cylindrical expanded portion 4 following it. As shown in FIG. 3, the reduced diameter portion 3 of the cylindrical main body 1 slidably receives the sewage pipe 5 inserted into the pipe joint of the present invention, and the reduced diameter portion 3 causes the sewage pipe 5 to move.
To support. Further, a peripheral groove 6 is provided on the inner peripheral surface near the tip of the reduced diameter portion 3, and a seal ring 7 is attached to the peripheral groove 6, and by this seal ring 7, a cylindrical main body is formed. Water resistance (watertightness) between 1 and the sewer pipe 5 inserted therein is maintained. The circumferential recessed groove 6 may be provided within the wall thickness of the reduced diameter portion 3, or may be provided so as to increase the outer diameter of the reduced diameter portion 3 as illustrated.

The expanded diameter portion 4 of the cylindrical main body 1 has an inner diameter larger than that of the reduced diameter portion 3 and is formed longer than the reduced diameter portion 3 in the axial direction. As shown in FIG. 3, a constant gap 8 can be maintained between the outer peripheral surface of the sewer pipe 5 supported by the reduced diameter portion 3 and the inner peripheral surface of the enlarged diameter portion 4. In the figure, the axial length of the reduced diameter portion 3 and the enlarged diameter portion 4 in the cylindrical body 1 is shown to be such that the enlarged diameter portion 4 is formed longer at a ratio of about 1: 2. The present invention is not limited to this, and it is preferable to form the reduced diameter portion 3 and the enlarged diameter portion 4 in a ratio of 1: 1 to 1: 4 according to the size of the sewer pipe to be applied. By maintaining a constant gap 8 between the outer peripheral surface of the sewer pipe 5 and the inner peripheral surface of the expanded diameter portion 4,
The gap 8 can absorb vibrations, impacts, and displacements applied to the connection between the sewer pipe 5 and the manhole 9 due to shaking of the earthquake or the like.

Further, in order to keep the gap 8 constant,
A pipe holding ring 10 may be inserted between the inner peripheral surface of the expanded diameter portion 4 of the cylindrical main body 1 and the outer peripheral surface of the sewer pipe 5. This tube holding ring 10 is provided with a mounting hole 1 for the manhole 9.
When connecting the sewage pipe 5 to the pipe joint of the present invention attached to No. 1, it is fitted and attached to the outer periphery of the sewage pipe 5 slidably inserted in the reduced diameter portion 3 of the cylindrical main body 1. The tube holding ring 10 may be made of any material and shape as long as it has hardness and elasticity capable of holding the gap 8 constant and has excellent durability.

In the pipe joint of the present invention, as shown in FIG. 3, in the mounting hole 11 of the manhole 9, the cylindrical main body 1 is directed from the inside of the manhole 9 to the outside thereof from the reduced diameter portion 3 in the arrow direction. Since it is an internal fitting type structure that is inserted and attached, the maximum outer diameter of the reduced diameter portion 3 must be the same as or smaller than the outer diameter of the enlarged diameter portion 4.

The flange portion 2 of the pipe joint of the present invention is integrally provided at the rear end of the expanded diameter portion 4 of the cylindrical main body 1. This flange part 2 is one side surface of the flange part 2, that is, when the pipe joint of the present invention is inserted into the mounting hole 11 formed in the manhole 9 from the inside of the manhole and mounted,
The surface 12 on the side of the cylindrical body contacts the inner wall surface of the manhole 9. Note that the flange portion 2 may be produced as a single body, and may be provided integrally with the rear end portion of the expanded diameter portion 4 at the construction site by adhesion, and may be integrally formed by injection molding or the like when manufacturing the pipe joint. It may be provided.

In the pipe joint of the present invention, the mandrel 9 has a mounting hole 11 in which the mandrel 9 has a mandrel 9 from the inner side of the manhole 9 to the radially contracted part 3 to the expanded part 4 of the cylindrical body 1. It is inserted until it comes into contact with the inner wall surface, and is attached integrally to the manhole 9 by using an adhesive 13 such as mortar or epoxy resin adhesive. This joining and unification is continuously performed from the joining portion of the surface 12 of the flange portion 2 on the cylindrical body side and the inner wall surface of the manhole 9 to the joining portion of the outer peripheral surface of the enlarged diameter portion 4 and the inner peripheral surface of the mounting hole 11. Done.

In the pipe joint of the present invention, when the cylindrical main body 1 is attached to the manhole 9, the flange portion 2 comes into contact with the inner wall surface of the attachment hole 11 of the manhole 9 so as to be in a locked state. Due to the pressure applied to the outer peripheral surface of the cylindrical main body 1 and the pulling force applied to the pipe joint from the outside, the pipe joint does not come off the manhole mounting hole or come out to the outside.
Further, the gap 8 held between the inner peripheral surface of the expanded diameter portion 4 of the cylindrical main body 1 and the outer peripheral surface of the sewer pipe 5 prevents the sewer pipe 5 from shaking due to an earthquake or the like occurring after the sewer pipe 5 is attached. Not only absorbing, but also against the pressure applied to the sewer pipe 5 from all directions,
The displacement of the mounting angle of the sewer pipe can be absorbed in the gap 8 with the reduced diameter portion 3 as a fulcrum.

In the pipe joint of the present invention, when the pipe joint is mounted in the mounting hole 11 of the manhole 9, the outer circumference of the enlarged diameter portion 4 of the cylindrical main body 1 abuts the inner peripheral surface of the mounting hole 11 of the manhole 9. By performing sanding processing (not shown) from the surface to the surface 12 of the flange portion 2 on the side of the cylindrical body, a stronger and water-tight joint with a concrete manhole can be obtained. Further, a mortar, a sealant, etc. are provided in the recess 14 formed between the pipe holding ring 10 inserted between the inner peripheral surface of the expanded diameter portion 4 and the outer peripheral surface of the sewer pipe 5 and the flange portion 2 of the pipe joint. It is preferable to fill it to make it a decorative surface. Further, it is possible to make a hole in the flange portion in advance and fix and hold an anchor bolt or the like in a concrete manhole with a nut or the like.

For the cylindrical main body 1 and the flange portion 2 of the pipe joint of the present invention, synthetic resin such as hard polyvinyl chloride, polyethylene, polypropylene, ABS, PET, etc. or recycled products of these molded products can be used. , The seal ring 7 and the pipe holding ring 10 have NBR, SBR, EP
Rubber-based materials such as DM and silicone rubber and elastic synthetic resins such as soft vinyl chloride resin and EVA can be used.

[0015]

According to the pipe joint of the present invention, the pipe joint does not come off from the mounting portion of the manhole due to shaking such as an earthquake, and the vibration and shock applied to the connecting portion between the sewer pipe and the manhole can be absorbed. The joint function with excellent durability can be maintained.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a pipe joint of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG.

FIG. 3 is a schematic cross-sectional view showing a mounted state of the pipe joint of the present invention.

[Explanation of symbols]

1 Cylindrical body of pipe fitting 2 Flange part 3 Reduced diameter of cylindrical body 4 Expanding part of cylindrical body 5 sewer pipe 6 circumferential groove 7 seal ring 8 gap 9 manholes 10 Tube retaining ring 11 Manhole mounting holes 12 Surface of cylindrical body side of flange 13 Adhesive 14 dent

Claims (2)

[Claims] 1. An internal fitting type pipe joint for connecting a sewer pipe to a side wall of a manhole, comprising a cylindrical main body into which the sewer pipe is inserted and a flange portion, wherein the cylindrical main body has a cylindrical shape. Of the reduced diameter portion and a concentric cylindrical expanded portion following the reduced diameter portion, the inner peripheral surface near the tip end of the reduced diameter portion is provided with a circumferential groove in which a seal ring is mounted, and the cylindrical main body A flange portion is integrally provided at the rear end portion of the cylindrical body, and the outer peripheral surface of the enlarged diameter portion of the cylindrical body and the cylindrical body side surface of the flange portion are joined and integrated with a manhole. And pipe fittings. 2. The pipe joint according to claim 1, wherein a pipe holding ring is inserted between the inner peripheral surface of the enlarged diameter portion and the outer peripheral surface of the sewer pipe.