JPH1163360A - Branch pipe joint device and reinforcing member for branch pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a branch pipe joint device and a reinforcing member for a branch pipe joint that can branch a pipe without causing creep deformation to the pipe and cutting off transportation of a fluid. SOLUTION: A reinforcing member 2 is electrically fused to a pipe 3, and a branch pipe joint 7 is fastened and fixed onto the reinforcing member 2 by bolts 20. A branch pipe 9 is connected to a connecting part 4 of the branch pipe joint 7 through a shut-off valve 14. Since the reinforcing member 2 is thus electrically fused to a part where the branch pipe joint 7 is fixed, the pipe 3 is prevented from being deformed by creep even in case of fastening the branch pipe joint 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe joint device used for transporting fluids such as tap water and city gas, and more particularly, to transporting fluid to a pipe made of a thermoplastic synthetic resin such as polyethylene. Without blocking
The present invention relates to a branch pipe joint device for connecting a branch pipe.

[0002]

2. Description of the Related Art In a prior art in which a branch pipe is connected to a polyethylene fluid transport pipe, a polyethylene branch saddle is electrically fused to a polyethylene pipe by supplying electric power to a heating wire embedded in the branch saddle. . In this branch saddle,
A new branch pipe is connected.

In this prior art, since the branch saddle is electro-fused to the polyethylene pipe, the position or posture of the branch saddle tends to shift during the electro-fusion. This may make it difficult to accurately connect the branch pipe to be connected to the branch saddle.

In order to solve this problem, it is conceivable to use a metal branch pipe joint instead of electrofusion of a polyethylene branch saddle. This metal branch pipe joint has, for example, a mounting part which is divided into two or three in the circumferential direction and surrounds the polyethylene pipe, and a fitting part such as a flange formed on one of the mounting parts. And the mounting part is
It is arranged adjacent to the outer circumference of the polyethylene pipe in the circumferential direction,
By the combination of the bolt and the nut screwed to the bolt, the mounting portion is mechanically tightened to the outer peripheral portion of the polyethylene pipe and is fixed airtight. This makes it possible to connect the metallic branch pipe joint to the correct position.

[0005] A new problem in the construction of connecting a metal branch pipe joint to a polyethylene pipe as described above is that the polyethylene pipe is crimped because the polyethylene pipe is firmly tightened by the mounting portion of the branch pipe joint. is there. This deformation of the polyethylene tube results in reduced airtightness.

In order to prevent creep deformation of the polyethylene pipe, it is conceivable to insert a rigid cylindrical core into the polyethylene pipe at a location where a branch pipe joint is connected, and to reinforce the polyethylene pipe. During the transport of fluids by pipes, it is not possible to construct them, so to speak, in the state of live tubes.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe made of thermoplastic synthetic resin in a state where the fluid is transported, without having to interrupt the transport of the fluid, and without causing creep deformation of the pipe. Another object of the present invention is to provide a branch pipe joint device capable of connecting a branch pipe.

Another object of the present invention is to provide a reinforcing member for a branch pipe joint with good workability for reinforcing a thermoplastic synthetic resin pipe to which the branch pipe joint is to be mounted so as not to creep. It is.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a tubular reinforcing member made of a thermoplastic synthetic resin provided with an electric heating element is electrically connected to an outer peripheral portion of a thermoplastic synthetic resin tube by heat generation of the electric heating element. A mounting portion fused and circumferentially divided into a plurality,
The metal branch pipe joint having a joint portion formed on at least one of the attachment portions is arranged in the circumferential direction, and is fixed to the outer peripheral portion of the reinforcing member in an airtight manner. This is a characteristic branch pipe joint device.

According to the present invention, when a thermoplastic synthetic resin pipe is branched, a thermoplastic synthetic resin tubular reinforcing member is first electro-fused to the outer peripheral portion of the pipe, and then a metallic metal pipe is formed thereon. The branch pipe joint is tightened and fixed in an airtight manner. Thereafter, a hole is made in the reinforcing member and the synthetic resin pipe, and the branch pipe is connected to the joint part of the branch pipe joint. When a metal branch joint is directly attached to a pipe as in the prior art, the synthetic resin pipe may be creep-deformed by firmly tightening the joint part divided in the circumferential direction. In this case, the synthetic resin pipe is reinforced by the tubular reinforcing member, so that even if the attachment portion of the branch joint is firmly tightened, the synthetic resin pipe is prevented from creeping and airtightness is maintained. In addition, when attaching a tubular member made of thermoplastic synthetic resin to a synthetic resin tube, since electric fusion is performed by heat generated by an electric heating element,
Easy and reliable mounting. In addition, the attachment of the reinforcing member by electrofusion is likely to shift in the circumferential direction and the axial direction, but even if the reinforcing member is shifted and attached to the pipe, the metal branch pipe joint is fixed by mechanically tightening the mounting part Therefore, when the branch pipe joint is mounted, the displacement of the reinforcing member can be corrected and the branch pipe joint can be accurately mounted. In this way, the branch pipe joint can be easily and accurately fixed to the synthetic resin pipe, and the workability is good.

The outer diameter of the pipe according to the present invention has a first plurality of predetermined first standard values, and the inner diameter of the mounting portion surrounding the pipe of the branch pipe joint has a second plurality of types. Wherein the reinforcing member has a thickness having one inner diameter of the first standard value and one outer diameter of the second standard value.

According to the present invention, for example, when a metal branch pipe joint is directly attached to a synthetic resin pipe to branch the pipe, not only the synthetic resin pipe may undergo creep deformation as described above, but also In addition, it is necessary to manufacture a plurality of metal branch pipe joints having a mounting portion having an inner diameter corresponding to a first plurality of predetermined first standard values which are outer diameters of the pipe. In addition, there are multiple types of joints to which branch pipes are connected.
It is necessary to manufacture more types of branch pipe joints depending on the combination of the mounting part and the joint part, and there is also a problem that the manufacturing cost of the metal branch pipe joint increases. However, the reinforcing member of the present invention has a second inner diameter whose inner diameter is equal to the first standard value, which is the outer diameter of the pipe, and whose outer diameter is the inner diameter of the mounting portion of the branch pipe joint.
Since it is selected equal to the standard value, fixing the branch pipe joint via this reinforcing member eliminates the need to manufacture many types of branch pipe joints, reducing the manufacturing cost of branch pipe joints and increasing the versatility of branch pipe joints. Be improved.

The reinforcing member of the present invention is made of a thermoplastic synthetic resin, is divided in the circumferential direction, has a circular cross section perpendicular to the axial direction, and is arranged adjacent to the circumferential direction to surround the pipe. Having a heating wire as an electric heating element buried in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of the divided body and in the vicinity of the entire circumferential side surface of the divided body. I do.

According to the present invention, the divided body of the reinforcing member includes:
Since the heating wire is buried in the vicinity of the entire inner peripheral surface and in the vicinity of the entire circumferential side surface, when the reinforcing member is to be fusion-bonded to the tube, a divided body is arranged in the circumferential direction of the tube, and a predetermined portion is provided on the heating wire. By energizing for a time, the inner peripheral surface of the divided body, the outer peripheral surface of the pipe, and the side faces of the divided bodies circumferentially adjacent to each other are electro-fused to each other, and the reinforcing member is airtightly fixed to the pipe. In this way, the reinforcing member can be manufactured at low cost because the heating wire is used as the electric heating element.

Further, the divided body according to the present invention is characterized in that it is equally divided in the circumferential direction, and the heating wire buried in the circumferential side surface is buried in only one of the circumferential side surfaces.

According to the present invention, the divided body is equally divided in the circumferential direction, and the heating wire buried in the circumferential side surface is buried in only one of the circumferential side surfaces. When attaching, the divided bodies are arranged on the outer periphery of the pipe such that the side where the heating wire is buried and the side where the heating wire is not buried are in contact with each other, so that the side faces of the divided bodies adjacent in the circumferential direction can be securely fused. can do. Therefore, there is no need to manufacture a plurality of types of divided bodies for one set of reinforcing members,
Only one kind needs to be manufactured, the versatility of the divided body is improved, and the manufacturing cost of the reinforcing member is reduced.

The reinforcing member of the present invention has a length that is equal to or greater than the length of the attachment portion of the branch pipe joint along the pipe, and the strength with which the heating wire can be divided at the time of piercing the divided body and the pipe. It is characterized by having.

According to the present invention, the reinforcing member has a length equal to or longer than the length of the mounting portion of the branch pipe joint along the pipe, so that when the reinforcing member is electro-fused, the reinforcing member is displaced in the axial direction of the pipe. Even if the branch pipe joint is fixed, the mounting position of the branch pipe joint in the axial direction can be easily corrected, and the branch pipe joint can be accurately and airtightly fixed. Further, since the heating wire has a strength capable of being divided at the time of drilling, the heating wire does not hinder the drilling, and the reinforcing member can be reliably drilled.

Further, the reinforcing member of the present invention has a length equal to or longer than the length of the mounting portion of the branch pipe joint along the pipe, and the reinforcing member has a position corresponding to the joint portion of the branch pipe joint. It is characterized in that a through hole is formed.

According to the present invention, since the through hole is formed in advance in the reinforcing member at a position corresponding to the joint portion of the branch pipe joint, it is not necessary to pierce the reinforcing member having a heating wire, so that the reinforcing member can be easily formed. Drilling is possible, and workability is improved.

Further, the reinforcing member of the present invention is characterized in that it is disposed only at both longitudinal ends of the mounting portion of the branch pipe joint along the pipe.

According to the present invention, since the reinforcing member is disposed only at both ends in the longitudinal direction of the branch pipe joint, the branch pipe joint is easily fused in the axial direction and circumferential direction of the pipe after the reinforcing member is electro-fused to the pipe. Can be fixed airtight. Further, since the reinforcing members are arranged only at both ends in the longitudinal direction of the mounting portion of the branch pipe joint, it is not necessary to pierce the reinforcing members at the time of piercing, so that the piercing can be easily performed and the workability is improved.

Also, according to the present invention, a male threaded portion which is screwed into a female threaded portion formed on an inner peripheral surface of a pipe connection port of a connected member is formed on an outer peripheral surface of a branch pipe made of a synthetic resin. The minimum wall thickness of the pipe peripheral wall at the formation location is equal to or larger than the wall thickness of the pipe peripheral wall other than the pipe connection region of the branch pipe, and the external thread portion of the inner peripheral surface of the branch pipe is formed. A reinforcing tubular body is inserted into at least a part of a portion corresponding to the formation portion in a closely contacting state, and the connected body is connected to a joint portion of a branch pipe joint.

According to the present invention, the pipe can be formed simply by screwing the male thread of the branch pipe into the female thread formed on the inner peripheral surface of the pipe connection port of the connected body connected to the joint of the branch pipe joint. The connection port can be connected to the branch pipe, and the minimum wall thickness of the pipe peripheral wall at the location where the male thread is formed is equal to or larger than the wall thickness of the pipe peripheral wall other than the pipe connection area of the fluid transport pipe. Because there is, the wall thickness of the pipe peripheral wall of the lowest strength valley portion of the external thread becomes larger than the wall thickness of the pipe peripheral wall other than the pipe connection area of the branch pipe,
As a result, the strength at the location where the male screw portion is formed can be increased to a level equal to or higher than the peripheral wall of the fluid transport pipe other than the pipe connection region.

Further, since the reinforcing cylindrical body is inserted into at least a part of the inner peripheral surface of the pipe corresponding to the portion where the male screw portion is formed, the shear strength at the above-mentioned portion can be simultaneously increased, and the earthquake and the like can be improved. Due to tensile or compressive forces in the pipe axis direction due to uneven settlement, or external forces such as shearing force or bending moment in the direction crossing the pipe axis, the pipe connection area of the branch pipe, especially the location where the male thread is formed, It is possible to avoid breaking before the pipe peripheral wall other than the pipe connection area. The branch pipe can be easily and firmly connected by screwing in this manner.

In the present invention, a portion of the inner peripheral surface of the pipe connection port located on the inner side of the female screw portion is radially increased as the fluid transport pipe is screwed toward the connection side of the pipe connection port with the pipe connection port. An elastic sealing material for sealing which is compressed outward is mounted, and the reinforcing cylinder extends to a portion corresponding to the elastic sealing material on the inner peripheral surface of the fluid transport pipe. It is characterized by.

According to the present invention, a sealing elastic sealing material is applied to the pipe connection port by utilizing a screwing operation to the connection side of the branch pipe for connecting the pipe connection port and the branch pipe. Since the inner peripheral surface and the outer peripheral surface of the branch pipe can be brought into close contact with each other in a compressed state, for example, as compared with a case where the elastic sealing material is compressed by a pushing operation to the connection side of the branch pipe with respect to the pipe connection port portion, The elastic sealing material can be reliably compressed with a small operation force.

Further, the pipe peripheral wall of the branch pipe receives stress concentration due to the reaction force against the compressive force of the elastic sealing material. This stress is received not only by the pipe peripheral wall of the fluid transport pipe but also by the reinforcing cylinder. Therefore, it is possible to prevent the pipe peripheral wall of the branch pipe from undergoing creep deformation over time due to the stress.

Further, the present invention is a reinforcing member for a branch pipe joint, which is electro-fused to an outer peripheral portion of a thermoplastic synthetic resin pipe, and a branch pipe joint is tightened to the outer peripheral portion to be airtightly fixed,
The reinforcing member is made of a thermoplastic synthetic resin, is equally divided in the circumferential direction, has a cross section perpendicular to the axial direction in an arc shape, and is arranged adjacent to the circumferential direction so as to surround the pipe in the circumferential direction. And a heating wire buried in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of the divided body, and near the entire surface of only one of the side surfaces in the circumferential direction. It is a reinforcing member.

According to the present invention, the divided body of the reinforcing member is equally divided in the circumferential direction, and the heating wire is embedded in one of the circumferential side surfaces and near the inner circumferential surface. When attaching, by arranging the divided body on the outer periphery of the pipe such that the side where the heating wire is buried and the side that is not buried are in contact with each other, the side of the divided body adjacent in the circumferential direction, and the inner peripheral surface Electrofusion can be reliably performed with the outer peripheral surface of the tube. Therefore, it is not necessary to manufacture a plurality of types of divided bodies for one set of reinforcing members, and only one type needs to be manufactured. The versatility of the divided bodies is improved, and the manufacturing cost of the reinforcing members is reduced.

[0031]

FIG. 1 is a perspective view showing a use state of a branch pipe joint device 1 according to an embodiment of the present invention.
The branch pipe joint device 1 is used when branching from a pipe 3 such as a water pipe in a water-free state, and a reinforcing member 2 attached to the pipe 3 is used.
And a T-shaped branch pipe joint 7 fixed to the reinforcing member 2. One end of the branch pipe 9 is connected to the connection part 4 of the branch pipe joint 7 via a gate valve 14 used at the time of branch work. The branch pipe 9 has a branch pipe main body 12 and a threaded joint 13 connected at one end to the branch pipe 9 by a connecting member 11. A flange joint 10 as a connected body is connected to a gate valve 14 provided in the branch pipe joint 7, and the threaded joint 13 of the branch pipe 9 is connected to the flange joint 10. The pipe 3, the branch pipe 9, the reinforcing member, the screw joint 13 and the connecting member 11 are each made of a thermoplastic synthetic resin such as polyethylene, and the branch pipe joint 7 and the flange joint 1
0 is made of a metal such as ductile cast iron.

FIG. 2 is a perspective view showing a state in which the reinforcing member 2 is electro-fused to the tube 3. The reinforcing member 3 is formed in a substantially cylindrical shape, and is equally divided into, for example, two in the circumferential direction. One divided body 15 and the other divided body 16 have the same configuration. Each of the divided bodies 15 and 16 is provided with a heating wire such as a nichrome wire at an inner peripheral portion thereof. Both ends of the heating wire are energized by terminals 17, which protrude outward at both axial ends of the divided bodies 15 and 16. 18 is electrically connected. When such a reinforcing member 2 is electro-fused to the pipe 3, the outer peripheral portion of the pipe 3 is surrounded by one divided body 15 and the other divided body 16, and the reinforcing member 2 is clamped by a clamp jig (not shown). Attach to tube 3.
Thereafter, an electric wire of a power supply device (not shown) is connected to each of the energizing terminals 17 and 18 of each of the one and other divided bodies 15 and 16 to energize the heating wire. After energizing for a predetermined time, the fusion surface is cooled while the reinforcing member 2 is fixed to the pipe 3 by the clamp jig, and the clamp jig is removed after the fusion surface is solidified.

FIG. 3 is a perspective view showing a state where the branch pipe joint 7 is fixed to the reinforcing member 2. The branch pipe joint 7 is composed of one mounting part 5 and the other mounting part 6 which are divided into two in the circumferential direction, and the other mounting part 6 is provided with the joint part 4,
A flange 19 is formed at the distal end of the joint 4, and a flange 26 of the gate valve 10 is connected to the flange 19 by a bolt.

The mounting portion 5 has clamping pieces 21 projecting radially outward from both ends in the circumferential direction and extending in the longitudinal direction along the pipe 3.
Similarly, the mounting portion 6 is provided with fastening pieces 23 and 24 on the outer side in the circumferential direction. Each of these fastening pieces 21 to 2
A plurality of bolt insertion holes are formed in each of the bolts 4. Therefore, when fixing the branch pipe joint 7 to the reinforcing member 2, the fastening pieces 21 and 22 of the one mounting portion 5 and the other mounting portion 6
The mounting portions 5 and 6 are mounted on the reinforcing member 2 such that the tightening pieces 23 and 24 abut against each other. Then each fastening piece 2
The branch pipe joint 7 is airtightly fixed to the reinforcing member 2 by inserting the bolt 20 into the bolt insertion holes formed in 1 to 24 and tightening the one mounting portion 5 and the other mounting portion 6.

The outer diameter D1 of the pipe 3 has a first plurality of types of predetermined first standard values.
Has a second plurality of predetermined second standard values, the inner diameter of the reinforcing member 2 is selected to be equal to the outer diameter D1 of the tube 2, and the outer diameter of the reinforcing member 2 is , 6 equal to the inner diameter D2. By forming the reinforcing member 2 in this manner and interposing it between the pipe 3 and the branch pipe joint 7, when the branch pipe joint 7 is fixed to the pipe 3, the mechanical tightening of the mounting portions 5, 6 is performed. The pipe 3 is prevented from being creep-deformed by the applied force, and the branch pipe joint 7 can be fixed to a plurality of types of pipes 3 by appropriately selecting the reinforcing member 2. Is improved.

The length of the reinforcing member 2 in the axial direction, more specifically, the length L1 between the current-carrying terminals 17 and 18 of the reinforcing member 2 is along the pipe 3 of the mounting portions 5 and 6 of the branch pipe joint 7. It has a length, that is, a length longer than the length L2 in the longitudinal direction.
Therefore, when fixing the branch pipe joint 7 to the reinforcing member 2, the branch pipe joint 7 can be adjusted and fixed in the axial direction of the pipe 3. As described above, since the reinforcing member 2 is fixed to the pipe 3 by electric welding, the reinforcing member 2 may be shifted with respect to the pipe 3 before the reinforcing member 2 is cooled and solidified. Since 7 is fixed by bolts 20, it can be easily fixed at an accurate position. Therefore, even if the reinforcing member 3 is displaced in the axial direction from the predetermined position, it is easy to adjust the branch pipe joint 7 in the axial direction and fix it accurately. The branch pipe joint 7 is fixed to the reinforcing member 2 so as to be adjustable in the circumferential direction. Thereby, the workability of the mounting work of the branch pipe joint 7 is improved.

FIG. 4 is a perspective view showing the other divided body 16 of the reinforcing member 2, FIG. 5 is a sectional view taken along the line VV of FIG. 4, and FIG. 6 is a sectional view of FIG. FIG. 6 is a cross-sectional view taken along line VI-VI. In the divided body 16, the cylindrical reinforcing member 2 is equally divided into two in the circumferential direction, and a cross section perpendicular to the axial direction has a semicircular shape. Inner peripheral surface 28 of divided body 16 facing the outer peripheral surface of pipe 3
The heating wires 27 are alternately folded and buried in the vicinity of the entire surface and in the vicinity of the entire surface of the one circumferential side surface 29. One end 27a of the heating wire 27 is connected to one end 16a of the divided body 16 in the longitudinal direction.
Then, it penetrates radially outward from the center in the thickness direction and is electrically connected to the energizing terminal 17 provided on the outer peripheral surface 31 of the divided body 16. The heating wire 27 extends in the circumferential direction along the inner peripheral surface 28 from the one end 27a toward the one peripheral side surface 29, and is formed by one bent portion 32 where the one peripheral side surface 29 and the inner peripheral surface 28 continue. It bends and bends in a substantially U-shape on one circumferential side surface 29, bends again at the bent portion 32, and extends in the circumferential direction along the inner circumferential surface 28 toward the other circumferential side surface 30. Heating wire 27 extending toward the other circumferential side surface 30
Is folded back in a substantially U-shape just before the other bent portion 33 where the other circumferential side surface 30 and the inner circumferential surface 28 continue, and extends in the circumferential direction again along the inner circumferential surface 28, and the one circumferential side surface At 29, it is folded back into a substantially U-shape. In this way, the heating wire 27 is embedded near the entire inner peripheral surface 28 and one peripheral side surface 29 of the divided body 16. The term “buried in the vicinity of the entire surface” means that the heating wire 27 is completely buried in the divided body 16 on the inner peripheral surface 28 side in the thickness direction as shown in FIG. The degree refers to a state in which it is buried so as to be exposed from the inner peripheral surface 28 and one peripheral side surface 29 surface. In this way, when the heating wire 27 is embedded a plurality of times back to the other end portion 16b of the divided body 16, the heating wire 2
The other end portion 27 b of 7 is penetrated in the thickness direction from the circumferential central portion of the inner peripheral surface 28 of the divided body 16, and is electrically connected to the energizing terminal 18 provided on the outer peripheral surface 31.

The distance W2 between the heating wires 27 adjacent in the longitudinal direction
Are selected equally, and both end faces 3 in the longitudinal direction of the divided body 16 are
6, 37 and the heating wire 27 arranged on both end sides W
1 is selected such that W1 ≦ W2 / 2, and one of the circumferential side surfaces 29
The distance W3 between the folded portion 38 and the outer peripheral surface 31 that are folded at
And a folded portion 35 folded immediately before the other bent portion 33
And the other bent portion 33 has an interval W4 of W3 = W4.
≤ W2 / 2. By arranging the heating wire 27 in this manner, the reinforcing member 2 and the pipe 3 are substantially uniformly thermally fused. Further, one divided body 15 and the other divided body 16 have the same configuration, and each of the divided bodies 15, 16
Are combined with each other and electrofused to the tube 3, the heating wire 27
The other circumferential side surface 3 of the other divided body 16 in which is not embedded
0 is joined so that one circumferential side surface 29 of one of the divided bodies 15 abuts, so that the heating wire of one of the divided bodies 15 is connected to the other circumferential side surface 30 as shown by a virtual line 36 in FIG. 27 are arranged. Thereby, one of the divided bodies 15
The one circumferential side surface 29 and the other circumferential side surface 30 of the other divided body 16 are substantially uniformly thermally fused over the entire surface. In addition, the heating wire 27 has such a strength that it can be cut off when the tube 3 is pierced.

FIG. 7 is a left side view of the branch pipe joint 7, FIG. 8 is a front view of the branch pipe joint 7, and FIG. 9 is a sectional view taken along the line IX-IX of FIG. FIG. 10 is a cross-sectional view taken along the line XX of FIG. 7, and FIG. 11 is an exploded perspective view showing a state in which the rubber packing 42 has been removed from the one mounting portion 5 of the branch pipe joint 7. FIG. 12 shows the branch pipe joint 7.
FIG. 7 is a perspective view showing a state in which a rubber packing 42 is fitted to one of the mounting portions 5. A plurality of bolt insertion holes 39 (four in this embodiment) are formed at equal intervals in the longitudinal direction of the fastening pieces 21 and 22 provided at both ends in the circumferential direction of the one mounting portion 5 of the branch pipe joint 7. Similarly, each fastening piece 2 of the other mounting portion 6
Four bolt insertion holes 39 are also formed in the holes 3 and 24, respectively.

As shown in FIG. 11, the mounting portion 5 is formed with a fitting groove 43 into which the rubber packing 42 is fitted. The fitting concave groove 43 extends in the longitudinal direction in the fastening pieces 21 and 22 and bends from both ends to have a substantially U-shape, and extends in an arc shape along the circumferential direction in both longitudinal ends of the mounting portion 5. Are formed in series with each other. The rubber packing 42 is formed endlessly along the fitting groove 43 so as to be fitted in the fitting groove 43 in a natural state.
2 and a pair of arc-shaped portions 46 attached to both longitudinal ends of the mounting portion 5. Such fitting groove 43 and rubber packing 42
The same configuration as that described above is provided in the other mounting portion 6 in a similar manner.

As shown in FIG. 12, the rubber packing 4
2 is fitted into the fitting groove 43, the rubber packing 42
Outer surface 42a of the inner surface 21a,
22a and the inner surface 5a at both ends in the longitudinal direction of the mounting portion 6 are provided so as to protrude uniformly by the height H1. Therefore, the one mounting part 5 and the other mounting part 6 are combined so that the respective tightening pieces 21 and 23 and the respective tightening pieces 22 and 24 are opposed to each other with the pipe 3 interposed therebetween. ~ 24
The outer surfaces of the linear portions 45 of the rubber packing 42 that are fitted into the branch pipe joint 7 are in contact with each other, and the arc-shaped portions 46 of the rubber packing 42 that are disposed at both axial ends of the branch pipe joint 7.
Abuts against the outer surface of the tube 3. In this state, each fastening piece 21 to
By tightening the bolt 24 with the bolt 20 and the nut 40, the branch pipe joint 7 is airtightly fixed to the reinforcing member 2 by the rubber packing 42. The branch pipe joint 7 can be air-tightly fixed to the reinforcing member 2 by the endless rubber packing 42 that is not divided in the length direction as described above.

FIG. 13 is a longitudinal sectional view showing a connection structure between the branch pipe 9 and the flange joint 10, FIG. 14 is a sectional view taken along the section line XIV-XIV of FIG. 13, and FIG. FIG. 10 is an exploded perspective view of a reinforcing cylinder body 62 and a threaded joint 13. One end of the branch pipe 9 has a threaded joint 13
And a substantially cylindrical pipe connection port 8 of the flange joint 10 to which the branch pipe joint 49 is connected.
Is connected. A flange 52 is integrally formed at one axial end of the pipe connection port 8, and a female screw portion 53 is formed at the other axial end of the inner peripheral surface of the pipe connection port 8. Two annular grooves 54a and 54b are provided at a predetermined axial distance from one end of the female thread 53 in the axial direction.
The annular grooves 54a and 54b are fitted with sealing elastic elastic members 55a and 55b made of synthetic rubber, for example, styrene butadiene rubber. A plurality of bolt insertion holes 56 are formed in the flange 52 along the circumferential direction at equal intervals in the circumferential direction.

The threaded joint 13 has a male threaded portion forming portion 58 having a male threaded portion 57 screwed with the female threaded portion 53 of the flange joint 10, and a connecting portion 4 connected to the branch pipe main body 12.
9 is provided. Inner diameter of branch pipe 9, ie, branch pipe body 1
The inner diameter of the connecting portion 49 between the screw joint 13 and the screw joint 13 is configured to be substantially constant along the axial direction. Connecting member 1
Reference numeral 1 denotes a structure substantially the same as that of the above-described reinforcing member 2, and connects the connecting portion 49 of the threaded joint and one end of the branch joint main body 12 by electric fusion.

A cylindrical portion 59 is integrally formed on the opposite side of the connecting portion 49 from the male screw portion forming portion 58, and the branch pipe 9 is inserted from the other end in the axial direction of the pipe connection port 8. When connecting by screwing, each of the sealing materials 55a, 55
The cylindrical portion 59 is fitted into the inner peripheral surface of each of the elastic seal members 5b sequentially, and is compressed radially outward on the inner bottom surfaces of the annular grooves 54a and 54b corresponding to the elastic seal members 55a and 55b. Further, a tapered surface 59a is formed on the outer peripheral surface of the distal end portion of the cylindrical portion 59, so that when the branch pipe 9 is inserted into and connected to the pipe connection port 8, each elastic sealing material 5 is formed.
5a and 55b are guided by the tapered surface 59a and are reliably compressed to the inner bottom surface. In the state where the branch pipe 9 is screwed and connected to the pipe connection port 8 in this manner, the seal members 55 a and 55 b are connected to the inner peripheral surface of the pipe connection port 8 and the outer circumference of the cylindrical portion 59 of the branch pipe 9. The gap between the inner peripheral surface of the pipe connection port 8 and the outer peripheral surface of the branch pipe 9 can be sealed. The annular groove 54b into which the elastic sealing material 55b having a larger diameter than the elastic sealing material 55a is fitted has a steep first inclined surface 65 at one axial end of the pipe connection port 8, and
And a gentle second inclined surface 66 on the other end side. Therefore, when the cylindrical portion 59 of the branch pipe 9 is inserted, the elastic sealing material 55b is pressed against the first inclined surface 65, and the elastic sealing material 55b is effectively pressed against the inner bottom surface of the annular groove 54b.

On the outer peripheral surface of the threaded joint 13 of the branch pipe 9, when the male thread 57 is screwed to a predetermined position of the female thread 3 of the pipe connection 8, the other end of the pipe connection 8 in the axial direction is screwed. A triangular plate-shaped stopper portion 60 that abuts on the end face of the branch pipe 9 and restricts further branching of the branch pipe 9 protrudes outward in the radial direction of the branch pipe 9 and is integrally formed. The stopper 6
Between the zeros, a hooking projection 61 to which a tool for rotating the branch pipe 9 when screwing the branch pipe 9 is hooked is formed so as to protrude integrally therewith.

The stopper portion 60 is configured to be elastically deformable and slightly deformable to the side opposite to the pipe connection port side by contact with the end face of the pipe connection port section 8.

The pipe connection area of the flange joint 10 with respect to the pipe connection port 8 is formed by the male screw portion forming portion 58 and the cylindrical portion 59, and the stopper portion 60 and the protrusion 61 forming portion.

As shown in FIG. 13, the portion corresponding to the valley portion of the male screw portion 57 of the male screw portion forming portion 58 is the portion of the pipe peripheral wall of the male screw portion forming portion 58 having the smallest thickness in the radial direction. The radial thickness (minimum thickness in the radial direction of the peripheral wall of the external thread portion forming portion 58) t1 of the pipe peripheral wall of the portion corresponding to the valley portion of the external thread portion 57 is determined by the pipe in the pipe connection region of the branch pipe 9. The peripheral wall, in other words, the connecting portion 49 of the threaded joint 13
And it is configured to be larger than the wall thickness t2 of the pipe peripheral wall of the branch pipe main body 12.

As shown in FIGS. 13 and 14, for example, a stainless steel reinforcing cylinder 62 is tightly attached to a portion of the inner peripheral surface of the branch pipe 9 corresponding to the male thread forming portion 58. The reinforcing cylindrical body 62 extends from a portion of the inner peripheral surface of the branch pipe 9 corresponding to each of the elastic seal members 55a and 55b to an opening end of the cylindrical portion 59.

The outer diameter of the reinforcing cylinder 62 is selected to be larger than the inner diameter of the branch pipe 9 in a natural state. The reinforcing cylinder 62 is inclined and divided at one location in the circumferential direction with respect to the axial direction. In other words, the cross section of the reinforcing cylinder 62 in a direction perpendicular to the axis is substantially C-shaped, and the gap 62 is formed along the axial direction.
a is deviated so as to be shifted in a circumferential direction.

The reinforcing cylinder 62 can be reduced in diameter against the elastic restoring force due to the presence of the gap 62a.
The outer diameter of the reinforcing cylinder 62 in the state of the most reduced diameter deformation is configured to be smaller than the inner diameter of the branch pipe 9.

As shown in FIGS. 13 to 15, the reinforcing cylinder 62 is attached to the inner peripheral surface of the branch pipe 9 by the reinforcing cylinder 6.
2 is inserted in a state where the outer diameter is reduced against the elastic restoring force until the outer diameter becomes smaller than the inner diameter of the branch pipe 9, and the reduced diameter deformation is released in the inserted state, whereby the branch pipe is released. 9
The diameter of the reinforcing cylinder 12 is increased until the outer peripheral surface of the reinforcing cylinder 62 is in close contact with the inner peripheral surface of the pipe. 9 is mounted in close contact with the inner peripheral surface. Such a reinforcing cylindrical body 62 may be an elastically deformable synthetic resin.

When the flange joint 10 is connected to the gate valve 14 provided in the branch pipe joint 7, the flange 52 of the flange joint 10 and the flange 48 of the gate valve 14 are opposed to each other as shown in FIG. A bolt 64 extends from the flange 52 to the flange 48 with an elastic sealing material (not shown) for sealing interposed between the flanges 52 and 48.
The gate valve 14 and the flange joint 10 can be airtightly connected by inserting and tightening.

FIG. 16 is a perspective view showing a branch pipe joint device 70 according to another embodiment of the present invention. The components corresponding to the branch pipe joint device 1 are denoted by the same reference numerals. In the branch pipe joint device 70, reinforcing members 71 and 72 are disposed at both axial end portions of the branch pipe joint 7, respectively. Reinforcement member 7
Each of the reinforcement members 1 and 72 has substantially the same configuration as the reinforcement member 2 of the branch pipe joint device 1, and each of the reinforcement members 71 and 72 is divided into divided bodies 73, 74 and 75 and 76, respectively. Each of the divided bodies 73 to 76 has the same configuration.

FIG. 17 is a perspective view showing the divided body 73. The divided body 73 has an inner peripheral surface 77 that abuts the outer peripheral surface of the pipe 3.
A heating wire 80 is buried in the vicinity of the entire surface of one circumferential side surface 78. The arrangement direction of the heating wires 80 is different from that of the heating wires 27 of the reinforcing member 2, and the heating wires 80 are spaced apart from each other in the circumferential direction of the divided body 73, are folded back in the axial direction, and have an inner circumferential surface 77 and one circumferential direction. It is buried in the vicinity of the entire side surface 78. Both ends of the heating wire 80 penetrate outward in the thickness direction from near the center in the circumferential direction near the one end in the longitudinal direction of the divided body 73, and are respectively connected to the energizing terminals 17 and 18 provided on the outer peripheral surface 31 of the divided body 73. Electrically connected. When such divided bodies 73 to 76 are electro-fused to the tube 3, one circumferential side surface 78 of the divided body 73 and the other circumferential side surface 70 of the divided body 74 abut against each other, and one end in the longitudinal direction. The split body 73 and the split body 74 are connected to the pipe 3 such that the current-carrying terminals 17 and 18 provided on the side of the section are located outside the branch pipe joint 7, respectively.
Are electrofused in combination so as to surround them. Similarly, the split body 75 and the split body 76 are mounted on the pipe 3 in combination with the other end side of the branch pipe joint 7 so that the current-carrying terminals 17 and 18 are located outside the branch pipe joint 7. Electrofusion. Thereafter, the branch pipe joint 7 extends over these reinforcing members 71 and 72.
Is fixed. At this time, as described above, the branch pipe joint 7 is provided with the rubber packing 42, and the arc-shaped portions 46 of the rubber packing 42 contact the outer peripheral surfaces 31 of the reinforcing members 71 and 72, respectively. The branch pipe joint 7 is air-tightly fixed.

In such a branch pipe joint device 70, since no reinforcing member is interposed in the portion corresponding to the joint portion 4 of the branch pipe joint 7, the reinforcing member is pierced when the branch pipe joint 7 is fixed and then pierced. There is no need, and workability is improved. Also, since each of the divided bodies 71 to 74 has the same configuration, only one type needs to be manufactured, and since the configuration of the reinforcing members 71 and 72 is smaller than the configuration of the reinforcing member 2, the manufacturing cost can be reduced. Can be. Also in such a branch pipe joint device 70, the reinforcing members 7 are provided near both ends in the axial direction of the branch pipe joint 7 where the tightening force of the branch pipe joint 7 acts.
Since the pipes 1 and 72 are arranged, the pipe 3 is reinforced, and creep deformation of the pipe 3 is prevented even when the branch pipe joint is tightened.

FIG. 18 is a perspective view showing a branch pipe joint reinforcing member 85 according to still another embodiment of the present invention.
The reinforcing member 85 is similar to the reinforcing member 2 of the branch pipe joint device 1. It should be noted that a through hole 86 is formed in the divided body 16 at a position corresponding to the joint part 4 of the branch pipe joint 7. is there. By forming the through-holes 86 in the divided body 16 in advance in this way, after fixing the branch pipe joint 7 to the reinforcing member 85 electro-fused to the pipe 3, the reinforcing member 85 It is not necessary to pierce the pipe, only the pipe 3 needs to be pierced, and the workability is improved. The heating wire 27 buried in the inner peripheral surface 28 of the divided body 16 is buried uniformly over the entire inner peripheral surface 28 avoiding the through holes 86. This prevents the drilling machine from cutting the heating wire 27.

FIG. 19 is a perspective view showing a reinforcing member 90 for a branch pipe joint device according to still another embodiment of the present invention. The reinforcing member 90 is similar to the reinforcing member 2, and it should be noted that the divided bodies 15 and 16 are provided with reinforcing metal plates 91 and 92 such as stainless steel plates, respectively. The metal plates 91 and 92 have a rectangular shape curved along the divided bodies 15 and 16, respectively, and are buried at the center in the thickness direction of the divided bodies 15 and 16, respectively, and are formed integrally with the divided bodies 15 and 16. By providing the metal plates 91 and 92 in this manner, the strength of the reinforcing member 90 is improved, and it is ensured that the pipe 3 is creep-deformed when the branch pipe joint 7 is fastened and fixed to the reinforcing member 90. Is prevented. Therefore, the thickness of the reinforcing member 90 can be reduced, and the pipe 3
The present invention can also be suitably implemented when the distance between the outside diameter of the branch pipe joint and the inside diameter of the branch pipe joint 7 is small. Such a metal plate 91,
Reference numerals 92 each have a thickness capable of being pierced by a piercing machine.

Next, the procedure of the construction for connecting the branch pipes with uninterrupted water will be described. First, the branch pipe joint 7 is fixed after the reinforcing member 2 is electro-fused to the pipe 3. Then, the joint part 4 of the branch pipe joint 7
The flange 26 on one side of the gate valve 14 is air-tightly fixed to the flange 19 with a bolt, and a punch (not shown) is attached to the flange 48 on the other side of the gate valve 14. Thereafter, the gate valve 14 is opened, the drilling machine is operated, and the drill is sent while rotating the main shaft of the drilling machine, and the reinforcing member 2 and the pipe 3 are bored by the cutter attached to the tip of the main shaft. Then, the spindle is retracted and returned to its original position, the gate valve 41 is closed, and the drilling machine is removed. Thereafter, the flange 52 of the flange joint 10 is airtightly fixed to the flange 48 on the other side of the gate valve 14, and the threaded joint 13 of the branch pipe 9 is screwed into the pipe connection port 8 of the flange joint 10 to branch into the pipe 3. The pipe 9 is connected, and the gate valve 14 is finally opened to complete the construction.

Further, the reinforcing member 2 of the present invention comprises a branch pipe joint 7.
Not only can it be used for reinforcement when fixing a pipe, but it can also be suitably implemented as a reinforcing member when fixing a pipe attached to a pipe or a branch pipe joint with a partition valve to the pipe due to uninterrupted water. Further, the reinforcing member 2 may be bonded not only to the tube 3 but also to the tube 3 by an adhesive. The pipe 3 and the reinforcing member 2 are not limited to being made of polyethylene, but may be made of another thermoplastic synthetic resin such as polyvinyl chloride. The pipe 3 and the reinforcing member 12 are made of polyethylene and polyvinyl chloride. It may be a combination. Further, the transport fluid of the pipe 3 may be a gas as well as a liquid such as water.

[0061]

As described above, according to the first aspect of the present invention, when the metal branch joint is mounted on the pipe, the synthetic resin pipe is reinforced by the tubular reinforcing member. Even if the portion is firmly tightened, creep deformation of the synthetic resin tube is prevented. When the thermoplastic synthetic resin tubular reinforcing member is attached to the synthetic resin pipe, it can be easily and reliably attached because it is electrically fused by the heat generated by the electric heating element. Also, the mounting of the reinforcing member by electric fusion is likely to shift in the circumferential direction and the axial direction of the tubular reinforcing member, but even if the reinforcing member is mounted to be shifted with respect to the pipe, the metal branch pipe joint requires a mechanical attachment. Since the joint is tightened and fixed, it is possible to correct the displacement of the reinforcing member at the time of attaching the branch pipe joint and to accurately attach the joint. In this way, the branch pipe joint can be easily and accurately fixed to the synthetic resin pipe, and the workability is good.

According to the second aspect of the present invention, the reinforcing member has an inner diameter equal to the first standard value which is the outer diameter of the pipe,
Since the outer diameter is selected to be equal to the second standard value, which is the inner diameter of the mounting portion of the branch pipe joint, it is not necessary to manufacture many types of branch pipe joints by fixing the branch pipe joint via this reinforcing member. The manufacturing cost of the pipe joint is suppressed, and the versatility of the branch pipe joint is improved.

According to the third aspect of the present invention, since the heating wire is buried in the divided body of the reinforcing member in the vicinity of the entire inner peripheral surface and in the vicinity of the entire circumferential side surface, the reinforcing member is connected to the pipe. In the case of mounting, the divided body is arranged in the circumferential direction of the tube, and the inner peripheral surface of the divided body, the outer peripheral surface of the tube, and the side surface of the circumferentially adjacent divided body are electrically connected to each other by supplying electricity to the heating wire. It is fused and the reinforcing member is securely fixed to the tube. In this way, the reinforcing member can be manufactured at low cost because the heating wire is used as the electric heating element.

According to the fourth aspect of the present invention, the divided body is equally divided in the circumferential direction, and the heating wire buried in the circumferential side surface is buried in only one of the circumferential side surfaces. When electrofusion is performed on the pipe, the divided bodies are arranged on the outer periphery of the pipe so that the side where the heating wire is buried and the side where the heating wire is not buried are in contact with each other. Electrofusion can be performed reliably. Therefore, there is no need to manufacture a plurality of types of divided bodies, and only one type needs to be manufactured. The versatility of the divided bodies is improved, and the manufacturing cost of the reinforcing member is reduced.

According to the fifth aspect of the present invention, since the reinforcing member has a length equal to or greater than the length along the pipe of the mounting portion of the branch pipe joint, the axis of the pipe is used when the reinforcing member is electro-fused. Even if the reinforcing member is shifted and fixed in the direction, the mounting position of the branch pipe joint in the axial direction can be easily corrected, and the branch pipe joint can be accurately fixed. Further, since the heating wire has a strength capable of being divided at the time of drilling, the heating wire does not hinder the drilling, and the reinforcing member can be reliably drilled.

According to the sixth aspect of the present invention, since the through hole is previously formed in the reinforcing member at a position corresponding to the joint portion of the branch pipe joint, there is no need to pierce the reinforcing member. The hole can be easily drilled, and workability is improved.

According to the seventh aspect of the present invention, since the reinforcing member is disposed only at both ends in the longitudinal direction of the branch pipe joint, the branch pipe joint is connected to the pipe axis after the reinforcing member is electro-fused to the pipe. It can be easily corrected and fixed in the direction and the circumferential direction. Further, since the reinforcing members are arranged only at both ends in the longitudinal direction of the mounting portion of the branch pipe joint, it is not necessary to pierce the reinforcing members at the time of piercing, so that the piercing can be easily performed and the workability is improved.

According to the eighth aspect of the present invention, the male thread of the branch pipe is screwed into the female thread formed on the inner peripheral surface of the pipe connection port of the body to be connected to the joint of the branch pipe. The pipe connection port can be connected to the branch pipe by simply performing the above operation, and the minimum wall thickness of the pipe peripheral wall at the place where the male thread is formed is equal to or less than the wall thickness of the pipe peripheral wall other than the pipe connection area of the fluid transport pipe. Since it is larger than that, the wall thickness of the pipe peripheral wall at the location where the valley of the external thread is formed is greater than the wall thickness of the pipe peripheral wall other than the pipe connection area of the fluid transport pipe, and as a result, the strength at the location where the external thread is formed Can be increased to be equal to or higher than the peripheral wall of the fluid transport pipe other than the pipe connection area.

Further, since the reinforcing cylindrical body is inserted into at least a part of the inner peripheral surface of the pipe corresponding to the location where the male screw portion is formed, the shear strength at the location can be simultaneously increased. Due to tensile or compressive force in the direction of the pipe axis caused by stiffening or uneven settlement, or external force such as shearing force or bending moment in the direction crossing the pipe axis, especially where the male thread is formed Can be prevented from breaking before the peripheral wall of the pipe other than the pipe connection area.

According to the ninth aspect of the present invention, sealing is performed by using a screwing operation on a connection side of the branch pipe with respect to the pipe connection port for connecting the pipe connection port and the branch pipe. The elastic sealing material can be brought into close contact with the inner peripheral surface of the pipe connection port and the outer peripheral surface of the branch pipe in a compressed state.
As compared with the case where the elastic sealing material is compressed by the pushing operation of the branch pipe to the connection side with respect to the pipe connection port portion, the elastic sealing material can be reliably compressed with a small operation force.

Moreover, the pipe peripheral wall of the branch pipe receives stress concentration due to the reaction force against the compressive force of the elastic sealing material. This stress is received not only by the pipe peripheral wall of the branch pipe but also by the reinforcing cylinder. Accordingly, it is possible to suppress the pipe peripheral wall of the fluid transport pipe from undergoing creep deformation over time due to the stress.

According to the tenth aspect of the present invention, the divided body of the reinforcing member is equally divided in the circumferential direction, and the heating wire is embedded in one of the circumferential side surfaces and near the inner circumferential surface. In the case of electrofusion to the pipe, by disposing the divided body on the outer periphery of the pipe so that the side surface on which the heating wire is embedded and the side surface not embedded are in contact with each other, the side surfaces of the divided bodies adjacent in the circumferential direction and Electrofusion between the inner peripheral surface and the outer peripheral surface of the tube can be reliably performed. Therefore, it is not necessary to manufacture a plurality of types of divided bodies, and only one type needs to be manufactured. The versatility of the divided bodies is improved, and the manufacturing cost of the reinforcing member is reduced.

[Brief description of the drawings]

FIG. 1 shows a branch pipe joint device 1 according to an embodiment of the present invention.
It is a perspective view which shows the use condition of.

FIG. 2 is a perspective view showing a state in which a reinforcing member 2 is electro-fused to a pipe 3;

FIG. 3 is a perspective view showing a state in which a branch pipe joint 7 is fixed to the reinforcing member 2;

FIG. 4 is a perspective view showing the other divided body 16;

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 4;

FIG. 6 is a sectional view taken along section line VI-VI in FIG. 4;

FIG. 7 is a left side view of the branch pipe joint 7;

FIG. 8 is a front view of the branch pipe joint 7;

FIG. 9 is a cross-sectional view as viewed from the section line IX-IX of FIG. 8;

FIG. 10 is a sectional view taken along line XX of FIG. 7;

FIG. 11 is an exploded perspective view showing a state in which a rubber packing 42 has been removed from one mounting portion 5;

FIG. 12 is a perspective view showing one mounting portion 5;

FIG. 13 is a longitudinal sectional view showing a connection structure between the branch pipe 9 and the flange joint 10.

FIG. 14 is a sectional view taken along section line XIV-XIV in FIG. 13;

FIG. 15 is an exploded perspective view of the flange joint 10, the reinforcing cylinder 62, and the screw joint 13.

FIG. 16 is a perspective view showing a branch pipe joint device 70 according to another embodiment of the present invention.

FIG. 17 is a perspective view showing a divided body 73.

FIG. 18 is a perspective view showing a branch pipe joint reinforcing member 85 according to still another embodiment of the present invention.

FIG. 19 is a perspective view showing a branch pipe joint reinforcing member 90 according to still another embodiment of the present invention.

[Explanation of symbols]

 1,70 Branch pipe joint device 2,85,90 Reinforcement member 3 Pipe 4 Joint part 5,6 Attachment part 7 Branch pipe joint 8 Pipe connection port part 9 Branch pipe 10 Flange joint 15,16,73,74,75,76 Divided body 27, 80 Heating wire 53 Female thread 55a, 55b Elastic seal material 57 Male thread 58 Male thread forming 62 Reinforced cylinder 86 Through hole

Claims (10)

[Claims] 1. A thermoplastic synthetic resin tubular reinforcing member provided with an electric heating element is electrically fused to an outer peripheral portion of a thermoplastic synthetic resin pipe by heat generated by the electric heating element. The mounting portion of the metal branch pipe joint having the mounting portion divided into at least one of the mounting portions and the fitting portion formed at least one of the mounting portions is disposed in the circumferential direction, and is provided on the outer peripheral portion of the reinforcing member. A branch pipe joint device which is tightly fixed by being tightened. 2. An outer diameter of the pipe has a first plurality of predetermined first standard values, and an inner diameter of a mounting portion of the branch pipe joint surrounding the pipe has a second plurality of types. The reinforcing member has a second standard value that is determined, and the reinforcing member has a thickness having one inner diameter of the first standard value and one outer diameter of the second standard value. The branch pipe joint device as described in the above. 3. The reinforcing member is made of a thermoplastic synthetic resin, is divided in a circumferential direction, has a cross section perpendicular to the axial direction in an arc shape, and is arranged adjacent to the circumferential direction so as to extend over the circumferential direction of the pipe. Claims: It has an enclosing divided body, and a heating wire which is an electric heating element buried in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of the divided body and in the vicinity of the entire circumferential side surface. Item 3. The branch pipe joint device according to item 1 or 2. 4. The branch according to claim 3, wherein the divided body is equally divided in the circumferential direction, and the heating wire buried in the circumferential side surface is buried in only one of the circumferential side surfaces. Pipe fitting equipment. 5. The reinforcing member has a length equal to or greater than the length of the mounting portion of the branch pipe joint along the pipe, and the heating wire has a strength capable of being divided at the time of piercing the divided body and the pipe. The branch pipe joint device according to claim 3, wherein the branch pipe joint device has: 6. The reinforcing member has a length equal to or greater than a length of the attachment portion of the branch pipe joint along the pipe, and the reinforcing member has a through hole at a position corresponding to the joint portion of the branch pipe joint. The branch pipe joint device according to claim 3, wherein the branch pipe joint is formed. 7. The branch pipe joint device according to claim 3, wherein the reinforcing member is disposed only at both ends in the longitudinal direction along the pipe of the mounting part of the branch pipe joint. 8. A male thread portion, which is screwed into a female thread portion formed on an inner peripheral surface of a pipe connection port portion of a body to be connected, is formed on an outer peripheral surface of a synthetic resin branch pipe. The minimum wall thickness of the pipe peripheral wall is configured to be equal to or larger than the wall thickness of the pipe peripheral wall other than the pipe connection region of the branch pipe, and at the male screw portion forming portion on the inner peripheral surface of the branch pipe. A reinforcing tubular body is inserted into at least a part of the corresponding portion in a tightly contacted state, and the connected body is connected to a joint portion of a branch pipe joint. The branch pipe joint device according to one. 9. A portion of the inner peripheral surface of the pipe connection port located on the inner side of the female screw portion is radially outward as the fluid transport pipe advances toward the connection side of the fluid transport pipe with respect to the pipe connection port. An elastic sealing material for sealing is mounted on the fluid transport pipe, and the reinforcing cylindrical body is extended to a portion corresponding to the elastic sealing material on the inner peripheral surface of the fluid transport pipe. The branch pipe joint device according to claim 8, wherein 10. A branch pipe joint reinforcing member which is electro-fused to an outer peripheral portion of a thermoplastic synthetic resin pipe and a branch pipe joint is tightened to the outer peripheral portion to be air-tightly fixed. A divided body made of a thermoplastic synthetic resin, which is equally divided in a circumferential direction, has a cross section perpendicular to the axial direction in an arc shape, and is arranged adjacently in the circumferential direction to surround the pipe in the circumferential direction; A reinforcing member for a branch pipe joint, comprising: a heating wire buried in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of the body, and in the vicinity of only one side surface in the circumferential direction.