JPH09196273A - Pipe joint having branch part and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide a pipe joint having a branch part joined and assembled by welding or the like so as to be reinforced and its reinforcing structure. SOLUTION: This pipe joint main body 12 is composed of a main pipe 13 made of a polyvinyl chloride resin and a junction pipe 14, which are adhered to each other by welding or the like so as to be integral. In this case, a reinforcing layer 15 for covering the outer peripheral surface of the welding joined part of the pipe joint main body 12 and a leg part 21 protruded from a part of the outer peripheral surface are made of reaction injection molding materials using norbornene type monomar such as dicyclopentadiene and a metathesis catalyst as main materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a pipe joint such as a large-diameter rod having a cleaning port made of vinyl chloride resin or a branch pipe joint portion, and a manufacturing method thereof.

[0002]

2. Description of the Related Art In order to obtain a branch pipe having a structure in which straight pipes made of vinyl chloride resin are connected to each other and which is branched midway, a straight pipe is partially cut out to form a shape. There is generally known a method of joining products, that is, molded products divided into a plurality of parts, by welding or the like to form a branched pipe having a desired shape.

In order to reinforce the welded portion of the branch pipe formed by the connection, a method of applying a hand layup method using FRP resin to the outer peripheral surface including the welded portion has been conventionally performed.

[0004]

However, the above-mentioned conventional hand lay-up method, which is a conventional reinforcing method, requires a great deal of skill and cannot be easily manufactured. Therefore, the productivity is low and the manufacturing cost is low. It has a drawback that it is costly.

Therefore, in order to solve the above problems, the present invention provides a pipe joint having a branch portion that is joined and assembled by welding formation or the like to be reinforced, and a manufacturing method for easily obtaining the reinforcing structure. Is intended.

[0006]

[Means for Solving the Problems] Next, means for solving the above problems will be described with reference to the drawings corresponding to the embodiments. The pipe joint 1 of the present invention is a pipe joint formed of vinyl chloride resin and having a branched portion 4, and a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst are provided on the outer peripheral surface of the joint portion of the branched portion 4. It is characterized in that the reinforced layer 5 is formed of a reaction injection molding material containing as a main material. In this case, if the pipe joint 1 is a pipe joint having the branch portion 4 joined by welding, the reinforcing structure thereof can be easily obtained.

Further, the pipe joint 11 of the present invention comprises a pipe joint main body 12 made of vinyl chloride resin and a branch pipe 14 joined by welding. The outer peripheral surface of the branch pipe 14 is welded. It is characterized in that the reinforcing layer 15 for covering and the protruding leg portion 21 are formed of a reaction injection molding material containing a norbornene-based monomer and a metathesis catalyst as main components. In this case, since the leg portion 21 is provided, it is possible to easily manufacture a large-diameter container or manhole made of vinyl chloride resin.

Further, according to the method of manufacturing the pipe joint having the branched portion of the present invention, the branched portion 4 formed of vinyl chloride resin is used.
An outer surface of the pipe joint having the branch portions 4 and 14 and an inner surface of the outer metal molds 6 and 16 which are surrounded by outer metal molds 6 and 16 on the outer sides of the pipe metal joints 1 and 11 having cores 14. In between, the reinforcing layers 5 and 15 made of a reaction injection molding material mainly composed of a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst are formed by reaction injection molding. In addition, the branch parts 4 and 14 which are cores
The pipe joints 1 and 11 having the above may be integrally formed by welding.

The method of manufacturing a pipe joint having a branched portion according to the present invention is formed of vinyl chloride resin, and the branched portion 4 or 1 is formed.
4 are integrally formed by welding, and the convex portion 22 is formed on the outer peripheral surface of the joint portion of the branch portions 4 and 14.
After forming the pipe, the pipe joints 2, 1 having the branch portions 4, 14
2 is a core, and the outside is surrounded by outer molds 6 and 16,
The convex portion 2 of the pipe joint 2, 12 having the branch portions 4, 14
Between the outer peripheral surface including 2 and the inner surface of the outer molds 6, 16 by reactive injection of the reinforcing layers 5, 15 made of a reaction injection molding material mainly composed of a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst. The feature is that it is formed by molding.

From the above, the outer peripheral surfaces of the pipe joint bodies 2 and 12 obtained by welding the molded product made of vinyl chloride resin are coated with the norbornene-based monomer to form the reinforcing layers 5 and 1.
The pipe joints 1 and 11 that are easily reinforced by forming
Is obtained, and at the same time when the reinforcing layers 5 and 15 are formed,
The leg portion 21 may be formed, and the leg portion 21 can be a leg portion that stabilizes the pipe joint 1 when the pipe joint is installed, for example.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

First Embodiment First, a pipe joint 1 which is a pipe body in which a plurality of pipe lines join will be described as a first embodiment.

FIG. 1 is a front view showing a first embodiment of a pipe joint according to the present invention. The pipe joint 1 is composed of a main body 2 and a reinforcing layer 5, and the pipe joint main body 2 is equivalent to the main pipe 3 in the middle of a straight pipe body which is a main pipe 3 as a molded product made of vinyl chloride resin. It is made of vinyl chloride resin and is formed in a substantially cross shape so that a branch pipe 4 as a straight branch portion having a slightly smaller diameter than the main pipe 3 penetrates.

In this pipe joint body 2, a through hole is formed in the middle of the main pipe 3, a branch pipe 4 is inserted into this through hole, and the branch pipe 4 is welded to each other with a welding rod to obtain a desired shape, that is, It is formed in a substantially cross shape.

The pipe joint 1 is composed of the main pipe 3 of the main body 2.
The outer peripheral surface of the welded joint between the pipe 4 and the branch pipe 4 is coated with a reaction injection molding material mainly composed of a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst to form a reinforcing layer 5.

Next, the structure of the outer die 6 used in the method of manufacturing the pipe joint 1 will be described. This outer mold 6
As shown in FIG. 2, the upper mold 6A and the lower mold 6B are divided into two parts so that the pipe joint body 2 having a substantially cross shape can be mounted.
Recessed groove-shaped cavities 8 each having a groove 7 extending from the center in a cross shape in four directions are formed so as to face each other.
A support groove 9 having an inner diameter substantially the same as the outer diameter of the tubes 3 and 4 and opening to the outside is formed in the groove portion 7 at a certain place.

The inner diameter of each groove portion 7 of the cavity 8 is larger than the outer diameter of each of the main pipe 3 and the branch pipe 4 of the main body 2 and is the outer peripheral surface of the main body 2 and the inner peripheral surface of the outer mold 6. In order to form an endless ring-shaped gap with the inner peripheral surface, the diameter of the main body 2 is made larger than that of the main body 2 by a length substantially equal to the wall thickness of each of the main body tubes 3 and 4, respectively. A sealing material 7a is provided at the end of the groove portion 7.
Is installed.

Further, a sealing material 6a is attached to the outer mold 6 so as to surround the cavity 8 on the surfaces of the upper mold 6A and the lower mold 6B that face each other. A gate 10 connected to an external material supply device (not shown) is provided, and a reaction injection molding material, which is a material mainly composed of a norbornene-based monomer and a metathesis catalyst, is used as a cavity 8
It is supplied inside.

Next, a method of manufacturing the pipe joint 1 of the present invention using the above-mentioned outer mold 6 will be described. First, the main body 2 of the pipe joint 1 is composed of a main pipe 3 and a branch pipe 4, and the pipes 3 and 4 are straight vinyl chloride resin pipe bodies obtained by extrusion molding or the like. The main pipe 3 has a bulged receiving port 3a formed at one end by heat molding or the like, and a through hole is formed in the middle part. The branch pipe 4 is formed to have a slightly smaller diameter than the main pipe 3 and has an outer diameter substantially equal to the inner diameter of the through hole.

Then, the branch pipe 4 is inserted into the through hole of the main pipe 3, and thereafter, the connecting portions of the main pipe 3 and the branch pipe 4 are welded to each other by a welding rod or high frequency heating, or bonded by an adhesive. To form a substantially cross shape.

Next, with the pipe joint body 2 formed in a substantially cross shape as a core, the outer mold 6 is divided into upper and lower halves.
Then, the upper mold 6A and the lower mold 6B are connected to each other and the cavity 8 is closed. At this time, the end portion of the main pipe 3 and the end portion of the branch pipe 4 are mounted in the support groove 9 of the outer die 6, and are sandwiched by the support groove 9.

Next, a reaction injection molding material, which is a material mainly composed of a norbornene-based monomer and a metathesis catalyst, is supplied into the cavity 8 through the gate 10 from a supply device (not shown). The supplied reaction injection molding material is injected into the gap between the outer peripheral surface of the pipe joint main body 2 and the inner peripheral surface of the cavity in the cavity 8 to cover the outer peripheral surface of the pipe joint main body 2.

After the norbornene-based monomer is reacted and cured in the outer mold 6, the upper and lower outer molds 6A,
6B is detached, whereby the above-described pipe joint 1, that is, the pipe joint in which the reinforcing layer 5 is formed on the outer peripheral surface including the welded joint portion (joint portion) of the main pipe 3 and the branch pipe 4 of the pipe joint body 2. 1 is obtained.

Therefore, according to the pipe joint 1 obtained by such a manufacturing method, the shape stability is provided on the outer peripheral surface of the welded portion of the molded product forming the shape of the pipe joint body 2 made of vinyl chloride resin. Since the reinforcing layer 5 is formed by coating with a reaction injection molding material of a norbornene-based monomer having a strong characteristic, the pipe joint 1 in which the welded portion is reinforced can be obtained.

This manufacturing method is different from the conventional method in that the fitting main body 2 is attached to the outer mold 6 and reaction-injection molding is performed on a material mainly composed of norbornene-based monomer and metathesis catalyst. Therefore, the reinforced pipe joint 1 can be easily obtained.

Further, since it is obtained by injection molding using the outer mold 6 instead of complicated work, it can be easily manufactured without requiring skill, and can be mass-produced easily and at low cost. It becomes possible to do.

Second Embodiment Next, a pipe joint 11 in which a plurality of pipes join each other and forms a pipe section in this pipe will be described as a second embodiment.

FIG. 3 is a perspective view showing a second embodiment of the pipe joint 11 according to the present invention. The pipe joint 11 is composed of a main body 12 and a reinforcing layer 15. The pipe joint main body 12 is equivalent to the main pipe 13 in the middle of a straight pipe body which is a main pipe 13 as a molded product made of vinyl chloride resin. Such as a merging pipe 14 as a branch pipe made of vinyl chloride resin of
It is formed in a substantially T shape.

In the pipe joint body 12, a through hole is formed in the middle of the main pipe 13, and the joining pipe 14 is connected to the through hole and welded to each other by using a welding rod or the like to obtain a desired shape, that is, It is formed in a substantially T shape.

The pipe joint 11 is mainly composed of a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst on the outer peripheral surface of the welded joint between the main pipe 13 and the confluent pipe 14 of the main body 12. The reaction injection molding material is coated to form the reinforcing layer 15, and the pipe joint 11 is stably installed on the outer peripheral surface in the direction opposite to the projecting direction of the merging pipe 14 projecting with respect to the main pipe 13. A leg portion 21 for protruding is formed.

Next, the structure of the outer mold 16 used in the method for manufacturing the pipe joint 11 will be described. As shown in FIG. 4, the outer die 16 has a two-piece configuration of an upper die 16A and a lower die 16B, and is T-shaped in three directions from the center so that the substantially T-shaped pipe joint body 12 is mounted. The cavities 18 each having a concave groove shape in which the groove portions 17 are formed to extend are formed so as to face each other, and each groove portion 17 of the cavity 18 has substantially the same outer diameter as that of the tubular bodies 13 and 14. Support grooves 19 each having an inner diameter and opening outward are formed. As shown in FIG. 4, the cavity 18 of the outer mold 16 is formed with a rectangular recess 20 for forming the leg 21.

The inner diameter of each groove 17 of the cavity 18 is larger than the outer diameter of each of the main pipe 13 and the confluent pipe 14 of the main body 12, and the outer peripheral surface of the pipe joint main body 12 and the inner peripheral surface of the outer die 16 are larger. In order to form an endless ring-shaped gap with the inner peripheral surface of a certain cavity 18, for example, the diameter is made larger than the main body by approximately the same length as the wall thickness of each tube 13, 14 of the main body, and A sealing material 17a is attached to the end of each groove 17.

Further, the outer mold 16 is provided with a gate (not shown) connected to an external material supply device (not shown), and reaction injection, which is a material mainly composed of a norbornene-based monomer and a metathesis catalyst, is used. Molding material is cavity 1
It is designed to be supplied within 8.

Next, a method of manufacturing the pipe joint 11 of the present invention using the above-mentioned outer mold 16 will be described. First, the main body 12 of the pipe joint 11 is composed of a main pipe 13 and a confluent pipe 14, and the main pipe 13 is a straight vinyl chloride resin pipe body obtained by extrusion molding or the like. This main pipe 13 has a bulged receiving port 13a formed at one end by heat molding or the like, and has a rectangular through hole formed in the middle thereof.

The merging pipe 14 is formed to have an outer diameter substantially the same as that of the main pipe 13, a receiving port 14a is formed at one end, and the other end 14b is formed to have a diameter-expanding shape.
The other end 14b is formed by expanding a diameter by welding a curved portion 14A integrally formed with the receiving port 14a and a curved portion 14B having the same shape as the curved portion 14A.

Then, the other end 14b of the merging pipe 14 is attached to the through hole of the main pipe 13, and thereafter, the connecting portions of the main pipe 13 and the merging pipe 14 are welded to each other by a welding rod or high-frequency heating, or bonded. Glue it with an agent,
It is formed in a substantially T shape.

Next, the pipe joint body 12 formed in the substantially T-shape is used as a core and mounted in the outer die 16 which is divided into upper and lower halves to connect the upper die 16A and the lower die 16B. The cavity 18 is closed. At this time, the end portion of the main pipe 13 and the end portion of the confluent pipe 14 are mounted in the support groove 19 of the outer die 16 and sandwiched by the support groove 19.

Next, a reaction injection molding material, which is a material mainly composed of a norbornene-based monomer and a metathesis catalyst, is supplied from a supply device (not shown) to the cavity 18 via a gate.
Supplied within. The reaction injection molding material supplied is the same as the outer peripheral surface of the pipe joint body 12 in the cavity 18 and the cavity 1.
8 is injected into the gap with the inner peripheral surface and the recess 20, and covers the outer peripheral surface of the pipe joint body 12.

After the reaction injection molding material is hardened in the outer mold 16, the upper and lower outer molds 16A and 16B are separated from each other, whereby the pipe joint 11 described above, that is, the main body of the pipe joint 12 is formed. The pipe joint 11 in which the reinforcing layer 15 is formed on the outer peripheral surface including the welded joint portion (joint portion) of the pipe 13 and the confluent pipe 14 and the leg portions 21 are projected is obtained.

Therefore, according to the pipe joint 11 obtained by such a manufacturing method, it is possible to obtain the pipe joint 11 in which the welded joint portion is reinforced, as in the first embodiment described above.

In addition, in this pipe joint 11, the reinforcement layer 15 which is the reinforcing portion is formed, and the protruding leg portion 21 is formed, so that the pipe joint 11 that can be stably installed is obtained. It becomes possible to obtain the pipe joint 11 that serves as a pit.

Further, also in the manufacturing method, as in the case of the first embodiment, the work of mounting the pipe joint body 12 on the outer mold 16 and injecting a material mainly composed of the norbornene-based monomer and the metathesis catalyst. As described above, it is possible to easily obtain the reinforced pipe joint 11,
In addition, it is possible to easily manufacture without requiring skill, mass production can be easily performed, and manufacturing can be performed at low cost.

Further, at the time of this manufacturing, the leg portions 21 can be obtained simultaneously and integrally, and it is possible to reduce the complicated forming work.

In each of the first and second embodiments described above, the reaction of the pipe joint bodies 2 and 12 mainly composed of the norbornene-based monomer such as dicyclopentadiene and the metathesis catalyst on the outer peripheral surface thereof. Although the example of coating the injection molding material to form the reinforcing layers 5 and 15 has been described, the outer peripheral surface of the pipe joint body 2 and 12 before forming the reinforcing layers 5 and 15 has a convex shape as shown in FIG. A portion 22 is formed, and the outer peripheral surface of the pipe joint body 2 (12) is covered with the convex portion 22 by the reaction injection molding material, and as shown in FIG.
The structure and the manufacturing method for forming (15) may be used.

In this case, the convex portion 22 formed on the outer peripheral surface of the pipe joint body 2 (12) is a ridge-shaped projection obtained by integral molding with the pipe joint body 2 (12), or by adhesion in a later process. Various shapes such as a ring-shaped ridge to be formed and an intermittent protruding shape are formed.

By forming the convex portion 22, the reaction injection molding material, which does not have strong adhesion to the vinyl chloride resin, is integrally molded in a meshed state, so that the reinforcing layer 5 is formed.
It becomes certain as (15).

An O-ring 23 made of a rubber material or a water-expandable rubber material is attached to the outer periphery of the pipe joint body 2 (12) together with the convex portion 22, and the reaction injection molding is performed together with the O-ring 23 and the convex portion 22. If the material is coated, the watertightness will be improved (see FIG. 6).

If the outer peripheral surface of the pipe joint body 12 to be covered is sanded to form the roughness of the outer peripheral surface without forming the above-mentioned protruding portion 22, the above-mentioned protruding portion 22 is formed.
Similarly, the reaction injection molding material which does not have strong adhesion to the vinyl chloride resin is integrally molded in the meshed state, and the reinforcing layers 5 and 15 are secured.

Further, in each of the above-described embodiments, a reaction injection molding material mainly composed of a norbornene-based monomer such as dicyclopentadiene and a metathesis catalyst is bonded to the molded products of the pipe joint bodies 2 and 12 by welding. The reinforcing layers 5 and 15 are formed by covering a part of the outer peripheral surface including the portions, but the reinforcing layers 5 and 15 are formed so as to cover the entire outer peripheral surfaces of the pipe joint bodies 2 and 12. Good.

[0049]

As described above, in the pipe joint according to the present invention, the outer peripheral surface of the joint portion of the pipe joint body made of vinyl chloride resin by welding the molded product forming the shape has shape stability. Since a reaction injection molding material mainly composed of a norbornene-based monomer and a metathesis catalyst having strong properties is coated and formed as a reinforcing layer, there is an effect that a pipe joint in which this connecting portion is reinforced can be obtained.

Further, in this pipe joint, since the reinforcing layer which is the reinforcing portion is formed and the protruding leg portion is formed,
With this leg portion, a pipe joint that can be stably installed can be obtained, and thus, it becomes possible to obtain a pipe joint that serves as a pipe section of the pipe line.

In comparison with the conventional method, this pipe joint manufacturing method is such that the pipe joint main body is mounted on an outer mold and a reaction injection molding material containing a norbornene monomer and a metathesis catalyst as main materials is injected. Since it can be obtained by the molding operation, the reinforced pipe joint can be easily obtained.

Further, according to this manufacturing method, since it can be obtained by injection molding using an outer mold, rather than a complicated work, it can be easily manufactured without requiring skill and can be mass-produced easily. At the same time, it becomes possible to manufacture at low cost.

Further, the projecting leg portions can be obtained simultaneously and integrally at the time of manufacturing, and the complicated forming work can be reduced.

Further, a convex portion is formed on the outer peripheral surface of the pipe joint body before forming the reinforcing layer, and the reaction injection molding mainly composed of norbornene-based monomer and metathesis catalyst is formed on the outer peripheral surface of the pipe joint body together with the convex portion. By coating the material and forming the reinforcing layer, this reaction injection molding material, which does not have strong adhesion to the vinyl chloride resin, is meshed and integrally molded, so it is a reliable reinforcing layer to cover. The effect is that

[Brief description of drawings]

FIG. 1 is a partially cut front view showing a first embodiment of a pipe joint according to the present invention.

FIG. 2 is an exploded perspective view of an outer mold used for manufacturing the pipe joint.

FIG. 3 is a perspective view showing a second embodiment of a pipe joint according to the present invention.

FIG. 4 is an exploded perspective view of an outer mold used for manufacturing the pipe joint.

FIG. 5 is a front view of a pipe joint body according to another embodiment.

FIG. 6 is a sectional view of the same.

[Explanation of symbols]

 1, 11 ... Pipe joint 2, 12 ... Pipe joint main body 4, 14 ... Branch portion (branch pipe, merge pipe) 5, 15 ... Reinforcement layer 6, 16 ... Outer mold 21 ... Leg portion 22 ... Convex portion

Claims (6)

[Claims] 1. In a pipe joint formed of vinyl chloride resin and having a branch portion, on the outer peripheral surface of the connecting portion of the branch portion,
A pipe joint having a branched portion, characterized in that a reinforcing layer made of a reaction injection molding material mainly composed of a norbornene-based monomer and a metathesis catalyst is formed. 2. In a pipe joint formed of vinyl chloride resin and having a branch portion, a reinforcing layer covering the outer peripheral surface of the joint portion of the branch portion and a protruding leg portion are mainly composed of a norbornene-based monomer and a metathesis catalyst. A pipe joint having a branch portion formed of a reaction injection molding material. 3. The pipe joint having a branch pipe according to claim 1, wherein the pipe joint is a pipe joint having a branch portion joined by welding. 4. A core made of a pipe joint formed of vinyl chloride resin and having a branch portion, the outer side of which is surrounded by an outer die,
Between the outer peripheral surface of the pipe joint having the branched portion and the inner surface of the outer mold, a reinforcement layer made of a reaction injection molding material containing a norbornene-based monomer and a metathesis catalyst as a main material is formed by reaction injection molding. A method for manufacturing a pipe joint having a characteristic branch portion. 5. A pipe joint formed of vinyl chloride resin and having a branch portion is integrally formed by welding, and then the pipe joint having the branch portion is used as a core, and the outer side thereof is surrounded by an outer die. Then, between the outer peripheral surface of the pipe joint having the branched portion and the inner surface of the outer mold, a reinforced layer made of a reaction injection molding material mainly composed of a norbornene-based monomer and a metathesis catalyst is formed by reaction injection molding. A method for manufacturing a pipe joint having a branch portion, which is characterized by the above. 6. A pipe joint formed of vinyl chloride resin and having a branch portion is integrally formed by welding, a convex portion is formed on an outer peripheral surface of a joint portion of the branch portion, and then a pipe having the branch portion is formed. The joint is used as a core, and the outside is surrounded by an outer mold,
Between the outer peripheral surface of the pipe joint having the branched portion and the inner surface of the outer mold, a reinforcement layer made of a reaction injection molding material containing a norbornene-based monomer and a metathesis catalyst as a main material is formed by reaction injection molding. A method for manufacturing a pipe joint having a characteristic branch portion.