JP4025393B2 - Reinforcing member and branch pipe joint device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a branch pipe joint device used for transporting fluids such as tap water and city gas. More specifically, the present invention relates to a pipe made of thermoplastic synthetic resin such as polyethylene without blocking the transport of fluid. The present invention relates to a branch fitting device for connecting pipes.
[0002]
[Prior art]
In the prior art in which a branch pipe is connected to a polyethylene fluid transport pipe, a polyethylene branch saddle is supplied to the polyethylene pipe, and electric power is supplied to a heating wire embedded in the branch saddle to perform electrical fusion. A new branch pipe is connected to the branch saddle.
[0003]
In this prior art, since the branch saddle is electrofused to the polyethylene pipe, the position or posture of the branch saddle is liable to shift during the electric fusion. This may cause difficulty in accurately connecting the branch pipe to be connected to the branch saddle.
[0004]
In order to solve this problem, it is conceivable to use a metal branch pipe joint instead of the electric fusion of the polyethylene branch saddle. This metal branch pipe joint has, for example, a mounting part that is divided into two or three parts in the circumferential direction and surrounds the polyethylene pipe, and a joint part such as a flange formed in one of the mounting parts. The mounting portion is disposed adjacent to the outer peripheral portion of the polyethylene pipe in the circumferential direction, and the mounting portion is mechanically tightened to the outer peripheral portion of the polyethylene pipe by a combination of a bolt and a nut screwed into the bolt. Airtightly fixed. Thereby, the metallic branch pipe joint can be connected to an accurate position.
[0005]
A new problem in the configuration in which the metal branch pipe joint is connected to the polyethylene pipe as described above is that the polyethylene pipe is firmly tightened by the attachment portion of the branch pipe joint, and the polyethylene pipe undergoes creep deformation. This deformation of the polyethylene pipe results in a decrease in hermeticity.
[0006]
In order to prevent creep deformation of the polyethylene pipe, it may be possible to reinforce by inserting a rigid cylindrical core at a location where the branch pipe joint in the polyethylene pipe is connected. During transportation, it is impossible to construct in a live tube state.
[0007]
[Problems to be solved by the invention]
It is an object of the present invention to connect a branch pipe in a state where a fluid is transported to a thermoplastic synthetic resin pipe without the need to block the transport of the fluid and without causing creep deformation of the pipe. An object of the present invention is to provide a branch pipe coupling device.
[0008]
  Another object of the present invention is for a branch pipe joint having good workability for reinforcing a thermoplastic synthetic resin pipe to which the branch pipe joint is to be attached so as not to undergo creep deformation.ofIt is to provide a reinforcing member.
[0009]
[Means for Solving the Problems]
  The present inventionA reinforcing member for a branch pipe joint that is electrically fused to the outer peripheral part of a thermoplastic synthetic resin pipe, and the branch pipe joint is fastened to the outer peripheral part and is airtightly fixed.
  A plurality of divisions made of a thermoplastic synthetic resin, equally divided in the circumferential direction, having a circular cross section perpendicular to the axial direction, and surrounding the entire circumference in the circumferential direction by being arranged adjacent to the circumferential direction. Body,
  A heating wire embedded in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of each divided body, and in the vicinity of the entire side surface of only one side in the circumferential direction,
  The heating wire extends in the circumferential direction along the inner circumferential surface toward one circumferential side surface, bends at one bent portion where the one circumferential side surface and the inner circumferential surface are continuous, and is substantially formed on one circumferential side surface. It is folded back into a U-shape, is bent again at the one bent portion, extends in the circumferential direction toward the other circumferential side surface along the inner circumferential surface, and the other circumferential side surface and the inner circumferential surface are connected to each other. Provided from one end in the longitudinal direction of the divided body to the other end in the longitudinal direction so as to be folded back in a substantially U shape immediately before the bent portion and extend in the circumferential direction along the inner peripheral surface again,
  The intervals W2 between the portions extending in the circumferential direction along the inner peripheral surface of the heating wire are all equal, and the interval W1 between the two portions close to both end surfaces in the longitudinal direction of the portions extending in the circumferential direction is the circumferential direction. A distance W3 between the folded portion and the outer circumferential surface that is folded at one circumferential side surface, and a folded portion that is folded immediately before the other bent portion. The interval W4 with the other bent portion is selected to be equal to or less than half of the interval W2 between the portions extending in the circumferential direction.It is.
  According to the present invention, the reinforcing member divided body is equally divided in the circumferential direction, and the heating wire is embedded in one of the circumferential side surfaces and in the vicinity of the inner circumferential surface. Is arranged on the outer periphery of the pipe so that the side surface where the heating wire is embedded and the side surface where the heating wire is not embedded are in contact with each other, so that the side surface of the divided body adjacent in the circumferential direction It can be surely electrofused with the surface. Therefore, it is not necessary to manufacture a plurality of types of divided bodies for a 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.
  In addition, by arranging the heating wire as described above, the reinforcing member and the tube are heat-sealed almost uniformly. In addition, when the divided bodies are combined and electrically fused to the pipe, the one circumferential side surface in which the heating wire is embedded and the other circumferential end surface in which the heating wire is not embedded are in contact with each other. Provided, the side surfaces of the divided bodies that contact each other are heat-sealed almost uniformly over the entire surface.
  The present invention also includes the reinforcing member,
  A mounting portion that is divided into a plurality of portions in the circumferential direction and is fastened to the outer peripheral portion of the reinforcing member to be hermetically fixed;
  It is a branch pipe joint apparatus characterized by having a joint part formed in at least one of those attachment parts.
[0010]
According to the present invention, when branching a tube made of thermoplastic synthetic resin, first, a tubular reinforcing member made of thermoplastic synthetic resin is electrofused to the outer periphery of the tube, and then a metal branch pipe joint is formed thereon. Then, the reinforcing member and the synthetic resin pipe are drilled, and the branch pipe is connected to the joint portion of the branch pipe joint. When the metal branch joint is directly attached to the pipe as in the prior art, the pipe made of synthetic resin may be creep-deformed by firmly fastening the joint portion divided in the circumferential direction. Then, since the synthetic resin pipe is reinforced by the cylindrical reinforcing member, even if the attachment portion of the branch joint is firmly tightened, the synthetic resin pipe is prevented from undergoing creep deformation and airtightness is maintained. Further, when the thermoplastic synthetic resin tubular reinforcing member is attached to the synthetic resin pipe, it can be easily and reliably mounted because it is electrically fused by the heat generated by the electric heating element. In addition, the attachment of the reinforcing member by electric fusion tends to shift in the circumferential direction and the axial direction, but the metal branch pipe joint is fixed by mechanically tightening the mounting portion even if the reinforcing member is attached to the pipe. Therefore, when the branch pipe joint is attached, the displacement of the reinforcing member can be corrected and attached accurately. In this way, the branch pipe joint can be easily and accurately fixed to the synthetic resin pipe, and the workability is good.
[0011]
Further, the outer diameter of the tube of the present invention has a first plurality of first predetermined standard values,
The inner diameter of the mounting portion surrounding the pipe of the branch pipe joint has a second standard value determined in advance of a second plurality of types,
The reinforcing member has one inner diameter of the first standard value,
It is characterized by being formed with a thickness having one outer diameter of the second standard value.
[0012]
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 be creep-deformed as described above but also the pipe. It is necessary to manufacture a plurality of metal branch pipe joints having attachment portions with inner diameters corresponding to the first plurality of first predetermined standard values that are the outer diameters of the first and second types. Moreover, since there are multiple types of joint diameters to which the branch pipes are connected, it is necessary to manufacture more types of branch pipe joints by combining the mounting part and the joint part, which increases the manufacturing cost of metal branch pipe joints. There are also problems such as. However, the reinforcing member of the present invention is selected so that the inner diameter is equal to the first standard value that is the outer diameter of the pipe, and the outer diameter is equal to the second standard value that is the inner diameter of the attachment portion of the branch pipe joint. By fixing the branch pipe joints through the pipes, it is not necessary to manufacture many kinds of branch pipe joints, and the production cost of the branch pipe joints is reduced and the versatility of the branch pipe joints is also improved.
[0017]
The reinforcing member of the present invention has a length equal to or longer than the length along the pipe of the attachment part of the branch pipe joint,
The heating wire is characterized in that it has a strength that allows it to be divided at the time of drilling the divided body and the tube.
[0018]
According to the present invention, since the reinforcing member has a length equal to or longer than the length of the pipe of the attachment portion of the branch pipe joint, the reinforcing member is displaced and fixed in the axial direction of the pipe when the reinforcing member is electrically fused. Even so, the axial attachment position of the branch pipe joint can be easily corrected, and the branch pipe joint can be fixed accurately and airtightly. In addition, since the heating wire has a strength that can be broken at the time of drilling, the heating wire does not hinder the drilling, and the reinforcing member can be reliably drilled.
[0019]
Further, the reinforcing member of the present invention has a length equal to or longer than the length along the pipe of the attachment part of the branch pipe joint,
The reinforcing member is characterized in that a through hole is formed at a position corresponding to the joint portion of the branch pipe joint.
[0020]
According to 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, it is not necessary to perforate the reinforcing member having the heating wire, and the perforation can be easily perforated. Workability is improved.
[0021]
Moreover, the reinforcing member of this invention is arrange | positioned only at the longitudinal direction both ends along the said pipe | tube of the attachment part of a branch pipe coupling, It is characterized by the above-mentioned.
[0022]
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 corrected in the axial direction and the circumferential direction of the pipe after the reinforcing member is electrically fused to the pipe. And can be fixed airtight. Further, since the reinforcing member is disposed only at both ends in the longitudinal direction of the attachment portion of the branch pipe joint, it is not necessary to drill the reinforcing member at the time of drilling, and the drilling can be easily performed and workability is improved.
[0023]
In the present invention, a male screw portion that is threadedly engaged with a female screw portion formed on the inner peripheral surface of the pipe connection port portion of the body to be connected is projected on the outer peripheral surface of the branch pipe made of synthetic resin. The minimum wall thickness of the pipe peripheral wall is configured to be equal to or greater than the wall thickness of the pipe peripheral wall other than the pipe connection region of the branch pipe, and the male threaded portion is formed on the inner peripheral surface of the branch pipe. Reinforcing cylinders are inserted in close contact with at least some of the corresponding parts,
The connected body is connected to a joint portion of a branch pipe joint.
[0024]
According to the present invention, the pipe connection port portion can be obtained by simply screwing the male screw portion of the branch pipe into the female screw portion formed on the inner peripheral surface of the pipe connection port portion of the connected body connected to the joint portion of the branch pipe joint. Since the minimum thickness of the pipe peripheral wall of the male thread portion forming portion is the same as or larger than the wall thickness of the pipe peripheral wall other than the pipe connection region of the fluid transport pipe, The wall thickness of the pipe peripheral wall of the lowest strength trough of the male screw part is larger than the wall thickness of the pipe peripheral wall other than the pipe connection area of the branch pipe. It can be increased to be equal to or higher than the peripheral wall of the pipe other than the region.
[0025]
In addition, since a reinforcing cylinder is inserted in close contact with at least a part of the inner peripheral surface of the pipe corresponding to the male threaded portion formation location, the shear strength at the site can be increased at the same time, such as an earthquake or uneven settlement. The pipe connection area of the branch pipe, especially where the male thread is formed, due to external forces such as tensile and compressive forces in the pipe axis direction caused by the pipe, or shearing force and bending moment in the direction intersecting the pipe axis. It is possible to avoid breaking ahead of other pipe peripheral walls. The branch pipes can be easily and firmly connected by screwing in this way.
[0026]
Further, in a portion located on the inner side of the inner peripheral surface of the pipe connection port portion of the present invention on the back side, radially outward as the fluid transport pipe is connected to the pipe connection port portion. An elastic sealing material for sealing to be compressed is mounted, and the reinforcing cylindrical body extends to a portion corresponding to the elastic sealing material on the inner peripheral surface of the fluid transport pipe. To do.
[0027]
According to the present invention, a sealing elastic sealing material is used for the inner peripheral surface of the pipe connection port part by utilizing a screwing operation to the connection side of the branch pipe for connecting the pipe connection port part and the branch pipe. And the outer peripheral surface of the branch pipe in a compressed state. For example, compared with the case where the elastic sealing material is compressed by pushing the branch pipe into the connection side of the pipe connection port, the operation force is small. Thus, the elastic sealing material can be reliably compressed.
[0028]
In addition, the pipe peripheral wall of the branch pipe receives stress concentration due to the reaction force against the compressive force of the elastic seal material, but this stress is received not only by the pipe peripheral wall of the fluid transport pipe but also by the reinforcing cylinder. It is possible to suppress the pipe peripheral wall of the branch pipe from creeping over time due to the stress.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
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 an uninterrupted water state, and a reinforcing member 2 attached to the pipe 3 and a T-shaped branch pipe joint fixed to the reinforcing member 2. 7. One end portion of the branch pipe 9 is connected to the connection portion 4 of the branch pipe joint 7 via a gate valve 14 used during branching work. The branch pipe 9 has a branch pipe main body 12 and a threaded joint 13 connected to one end of the branch pipe main body 12 by a connecting member 11. A flange joint 10 as a connected body is connected to the gate valve 14 provided in the branch pipe joint 7, and the thread 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 10 are each made of a metal such as ductile cast iron.
[0032]
FIG. 2 is a perspective view showing a state in which the reinforcing member 2 is electrically fused to the tube 3. The reinforcing member 3 is generally formed in a cylindrical shape, and is equally divided into two, for example, 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 on the inner periphery thereof, and both ends of the heating wire are energized terminals 17 projecting outward at both ends in the axial direction of the divided bodies 15 and 16. 18 is electrically connected. When such a reinforcing member 2 is electrically fused to the tube 3, the outer periphery of the tube 3 is surrounded by one divided body 15 and the other divided body 16, and the reinforcing member 2 is attached by a clamping jig (not shown). Attach to tube 3. Thereafter, an electric wire of a power supply device (not shown) is connected to the energization terminals 17 and 18 of the one and the other divided bodies 15 and 16, respectively, and energizes the heating wire. After energization for a predetermined time, the fusion surface is cooled in a state where the reinforcing member 2 is fixed to the tube 3 with the clamp jig, and the clamp jig is removed after the fusion surface is solidified.
[0033]
FIG. 3 is a perspective view showing a state in which the branch pipe joint 7 is fixed to the reinforcing member 2. The branch pipe joint 7 is composed of one attachment portion 5 and the other attachment portion 6 which are divided into two in the circumferential direction, and the other attachment portion 6 is provided with a joint portion 4. A flange 19 is formed at the portion, and a flange 26 of the gate valve 10 is connected to the flange 19 by a bolt.
[0034]
The attachment portion 5 is provided with fastening pieces 21 and 22 that protrude radially outward from both ends in the circumferential direction and extend in the longitudinal direction along the pipe 3. Similarly, the attachment portion 6 also has fastening pieces outward in the circumferential direction. 23, 24 are provided. Each of the fastening pieces 21 to 24 is formed with a plurality of bolt insertion holes. Therefore, when the branch pipe joint 7 is fixed to the reinforcing member 2, the attachment portions are arranged so that the fastening pieces 21 and 22 of one attachment portion 5 and the fastening pieces 23 and 24 of the other attachment portion 6 abut each other. 5 and 6 are attached to the reinforcing member 2. Thereafter, the branch pipe joint 7 is hermetically sealed to the reinforcing member 2 by inserting the bolts 20 into the bolt insertion holes formed in the respective fastening pieces 21 to 24 and fastening the one attachment portion 5 and the other attachment portion 6. Fixed.
[0035]
The outer diameter D1 of the pipe 3 has a first plurality of types of predetermined first standard values, and the inner diameter D2 of the mounting portions 5 and 6 of the branch pipe joint 7 is a second plurality of types of predetermined second standards. The reinforcing member 2 has an inner diameter selected to be equal to the outer diameter D1 of the tube 2, and the reinforcing member 2 has an outer diameter selected to be equal to the inner diameter D2 of the mounting portions 5 and 6. 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 fastening of the mounting portions 5, 6 is performed. The pipe 3 is prevented from creeping due to 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. Will improve.
[0036]
Further, 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 the length along the pipe 3 of the attachment portions 5 and 6 of the branch pipe joint 7, That is, it has a length equal to or longer than the length L2 in the longitudinal direction. Therefore, when the branch pipe joint 7 is fixed 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 displaced from the pipe 3 until the reinforcing member 2 is cooled and solidified. Since 7 is fixed by the bolt 20, it can be easily fixed at an accurate position. Therefore, even if the reinforcing member 3 is displaced in the axial direction from a 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. This improves the workability of the work for installing the branch pipe joint 7.
[0037]
4 is a perspective view showing the other divided body 16 of the reinforcing member 2, FIG. 5 is a cross-sectional view taken along the cutting plane line VV of FIG. 4, and FIG. 6 is a cutting plane line VI- of FIG. It is sectional drawing seen from 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 is semicircular. Heating wires 27 are alternately folded and embedded in the vicinity of the entire inner peripheral surface 28 facing the outer peripheral surface of the pipe 3 and the entire surface of one circumferential side surface 29 of the divided body 16. One end portion 27 a of the heating wire 27 is penetrated outward in the thickness direction from the central portion in the radial direction at the one end portion 16 a in the longitudinal direction of the divided body 16, and electrically connected to the energizing terminal 17 provided on the outer peripheral surface 31 of the divided body 16. Connected. The heating wire 27 extends in the circumferential direction along the inner peripheral surface 28 from the one end portion 27 a toward the one circumferential side surface 29, and is one bent portion 32 where the one circumferential side surface 29 and the inner peripheral surface 28 are continuous. It bends and is folded back in a substantially U shape at one circumferential side surface 29 and is bent 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. The heating wire 27 extending toward the other circumferential side surface 30 is folded back into a substantially U-shape just before the other bent portion 33 where the other circumferential side surface 30 and the inner circumferential surface 28 are continuous, and again the inner circumferential surface 28. And is folded back in a substantially U shape at one circumferential side surface 29. In this way, the heating wire 27 is embedded in the vicinity of the entire inner peripheral surface 28 and one circumferential side surface 29 of the divided body 16. It is to be noted that being embedded in the vicinity of the entire surface means that the heating wire 27 is completely embedded on the inner peripheral surface 28 side in the thickness direction in the divided body 16 as shown in FIG. 5 or a part or half of the heating wire 27. A state in which the degree is buried so as to be exposed from the inner circumferential surface 28 and the surface of one circumferential side surface 29. In this way, when the heating wire 27 is diffracted and embedded multiple times to the other end portion 16 b of the divided body 16, the other end portion 27 b of the heating wire 27 extends from the center in the circumferential direction of the inner peripheral surface 28 of the divided body 16. It penetrates in the thickness direction and is electrically connected to the energizing terminal 18 provided on the outer peripheral surface 31.
[0038]
The intervals W2 between the heating wires 27 adjacent to each other in the longitudinal direction are all selected equally, and the interval W1 between the longitudinal end surfaces 36, 37 of the divided body 16 and the heating wires 27 arranged on both ends is W1 ≦ W2 / 2. The distance W3 between the folded portion 38 and the outer circumferential surface 31 that is folded at one circumferential side surface 29, and the distance between the folded portion 35 that is folded immediately before the other bent portion 33 and the other bent portion 33. W4 is selected as W3 = W4 ≦ W2 / 2, respectively. By arranging the heating wire 27 in this way, the reinforcing member 2 and the tube 3 are heat-sealed almost uniformly. Further, one divided body 15 and the other divided body 16 have the same configuration, and when the divided bodies 15 and 16 are combined and electrically fused to the tube 3, the other heating wire 27 is not embedded. Since the other circumferential side surface 30 of the divided body 16 is combined so that one circumferential side surface 29 of one divided body 15 abuts, the other circumferential side surface 30 as shown by an imaginary line 36 in FIG. The heating wire 27 of one of the divided bodies 15 is disposed in the middle. Thus, one circumferential side surface 29 of one divided body 15 and the other circumferential side surface 30 of the other divided body 16 are heat-sealed almost uniformly over the entire surface. Further, the heating wire 27 has a strength that can be divided when the tube 3 is drilled.
[0039]
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 taken along the section line IX-IX in FIG. 8, and FIG. FIG. 11 is a cross-sectional view taken along the section line XX of FIG. 7, and FIG. 11 is an exploded perspective view showing a state where the rubber packing 42 is removed from one attachment portion 5 of the branch pipe joint 7. FIG. 3 is a perspective view showing a state in which a rubber packing 42 is fitted to one attachment portion 5 of the branch pipe joint 7. A plurality of bolt insertion holes 39, four in this embodiment, are formed in the fastening pieces 21 and 22 provided at both ends in the circumferential direction of one attachment portion 5 of the branch pipe joint 7 in the longitudinal direction. Similarly, four bolt insertion holes 39 are formed in each of the fastening pieces 23 and 24 of the other mounting portion 6.
[0040]
As shown in FIG. 11, a fitting groove 43 in which the rubber packing 42 is fitted is formed in the attachment portion 5. The fitting groove 43 extends in the longitudinal direction in the fastening pieces 21 and 22 and is bent from both ends to be substantially U-shaped, and extends in an arc shape along the circumferential direction at both ends in the longitudinal direction of the mounting portion 5. Are formed continuously. The rubber packing 42 is formed endlessly along the fitting groove 43 so as to be fitted into the fitting groove 43 in a natural state, and a pair of straight lines attached to the fastening pieces 21 and 22. And a pair of arcuate portions 46 attached to both ends in the longitudinal direction of the attachment portion 5. The same configuration as the fitting groove 43 and the rubber packing 42 is also provided in the other mounting portion 6 in the same manner.
[0041]
As shown in FIG. 12, when the rubber packing 42 is fitted into the fitting groove 43, the outer surface 42 a of the rubber packing 42 corresponds to the inner surfaces 21 a and 22 a of the fastening pieces 21 and 22 and the mounting portion 6. It is provided so as to protrude uniformly by a height H1 from the inner surface 5a at both ends in the longitudinal direction. Therefore, by combining one attachment portion 5 and the other attachment portion 6 so that the fastening pieces 21 and 23 and the fastening pieces 22 and 24 face each other with the tube 3 interposed therebetween, each fastening piece 21 is assembled. The outer surface of the linear portion 45 of the rubber packing 42 fitted to 24 is in contact with each other, and the arc-shaped portions 46 of the rubber packing 42 disposed at both axial ends of the branch pipe joint 7 Abuts on the outer surface. By tightening the fastening pieces 21 to 24 with the bolts 20 and the nuts 40 in this state, the branch pipe joint 7 is airtightly fixed to the reinforcing member 2 by the rubber packing 42. In this way, the branch pipe joint 7 can be hermetically fixed to the reinforcing member 2 by the endless rubber packing 42 that is not divided in the length direction.
[0042]
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 cutting plane line XIV-XIV in FIG. 13, and FIG. 3 is an exploded perspective view of a cylindrical body 62 and a threaded joint 13. FIG. A threaded joint 13 is provided at one end of the branch pipe 9, and the substantially cylindrical pipe connection port 8 of the flange joint 10 to which the branch pipe joint 49 is coupled is connected to the threaded joint 13. A flange 52 is integrally formed at one end in the axial direction of the pipe connection port 8, and a female screw portion 53 is formed at the other end in the axial direction of the inner peripheral surface of the pipe connection port 8. Two annular grooves 54a and 54b are formed at a predetermined interval in the axial direction on the one end side in the axial direction with respect to the female screw portion 53. Each of the annular grooves 54a and 54b is made of synthetic rubber, for example, Sealing annular elastic sealing materials 55a and 55b made of styrene butadiene rubber are fitted. A plurality of bolt insertion holes 56 are formed through the flange 52 at equal intervals in the circumferential direction along the circumferential direction.
[0043]
The threaded joint 13 includes a male threaded portion forming portion 58 having a male threaded portion 57 that is screwed into the female threaded portion 53 of the flange joint 10, and a connecting portion 49 that is coupled to the branch pipe body 12. The inner diameter of the branch pipe 9, that is, the inner diameter of the connecting portion 49 between the branch pipe main body 12 and the threaded joint 13 is configured to be a substantially constant inner diameter along the axial direction. The connecting member 11 has substantially the same configuration as that of the reinforcing member 2 described above, and connects the connecting portion 49 of the threaded joint and one end portion of the branch joint main body 12 by electric fusion.
[0044]
A cylindrical portion 59 is integrally formed on the opposite side of the connecting portion 49 with respect to the male screw portion forming portion 58, and the branch pipe 9 is inserted and screwed from the other axial end of the pipe connection port portion 8. Are connected to the inner peripheral surfaces of the respective sealing materials 55a and 55b in sequence, and the inner circumferential surfaces of the respective annular grooves 54a and 54b corresponding to the respective elastic sealing materials 55a and 55b. Compress radially outward. Further, a tapered surface 59a is formed on the outer peripheral surface of the distal end portion of the cylindrical portion 59, whereby each elastic sealing material 55a, 55b is connected to the tapered surface when the branch pipe 9 is inserted and connected to the pipe connection port portion 8. It is guided to 59a and is 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 way, the sealing materials 55a and 55b are connected to the inner peripheral surface of the pipe connection port 8 and the outer periphery of the cylindrical portion 59 of the branch pipe 9. In close contact with the surface, 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. Further, the annular groove 54b into which the elastic seal material 55b having a diameter larger than that of the elastic seal material 55a is fitted includes a steep first inclined surface 65 on one end side in the axial direction of the pipe connection port 8 and a gentle on the other end side. Second inclined surface 66. 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.
[0045]
When the male thread portion 57 is screwed to the outer peripheral surface of the threaded joint 13 of the branch pipe 9 up to a predetermined position of the female thread portion 3 of the pipe connection port portion 8, the end surface of the other end portion in the axial direction of the pipe connection port portion 8 is A triangular plate-like stopper portion 60 that abuts and restricts the branch tube 9 from further screwing is integrally formed so as to protrude outward in the radial direction of the branch tube 9. Further, between the stopper portions 60, a hooking protrusion 61 is formed so as to project integrally as a tool for hooking a tool for rotating the branch pipe 9 when the branch pipe 9 is screwed.
[0046]
The stopper portion 60 is configured to be elastically bent and deformed slightly on the side opposite to the tube connection port portion side by abutting against the end surface of the tube connection port portion 8.
[0047]
In addition, the pipe connection area | region with respect to the pipe connection port part 8 of the flange joint 10 is comprised with the formation part of the said male thread part formation part 58, the cylindrical part 59, and the said stopper part 60, and the protrusion 61. FIG.
[0048]
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 that has the smallest thickness in the radial direction. The thickness in the radial direction of the pipe peripheral wall of the portion corresponding to the valley portion of the portion 57 (minimum thickness in the radial direction of the pipe peripheral wall of the male screw portion forming portion 58) t1 is the pipe peripheral wall of the pipe connection region of the branch pipe 9, in other words, For example, the connecting portion 49 of the threaded joint 13 and the wall thickness t2 of the pipe peripheral wall of the branch pipe main body 12 are configured to be larger.
[0049]
As shown in FIGS. 13 and 14, for example, a stainless steel reinforcing cylinder 62 is inserted into the inner peripheral surface of the branch pipe 9 into a portion corresponding to the male screw portion forming portion 58 in a close contact state. Further, the reinforcing cylinder 62 extends from a portion corresponding to each elastic sealing material 55a, 55b on the inner peripheral surface of the branch pipe 9 to the opening end of the cylindrical portion 59.
[0050]
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 divided by being inclined with respect to the axial direction at one place in the circumferential direction. That is, the cross section in the direction perpendicular to the axis of the reinforcing cylinder 62 is substantially C-shaped, and the gap 62a is divided along the axis direction so as to be shifted in the circumferential direction.
[0051]
The reinforcing cylinder 62 can be reduced in diameter against the elastic restoring force due to the presence of the gap 62a, and the outer diameter of the reinforcing cylinder 62 in the most reduced diameter deformation state is larger than the inner diameter of the branch pipe 9. It is configured to be small.
[0052]
As shown in FIGS. 13 to 15, the reinforcing cylinder 62 is elastically restored with respect to the inner peripheral surface of the branch pipe 9 until the outer diameter of the reinforcing cylinder 62 becomes smaller than the inner diameter of the branch pipe 9. Insertion is performed in a state in which the diameter is reduced against the force, and in the inserted state, the diameter reduction is released, so that the outer peripheral surface of the reinforcing cylinder 62 is in close contact with the inner peripheral surface of the branch pipe 9. After that, the reinforcing cylinder 12 is mounted in close contact with the inner peripheral surface of the branch pipe 9 in a state where the diameter is reduced against the remaining elastic restoring force toward the enlarged diameter side. Such a reinforcing cylinder 62 may be an elastically deformable synthetic resin.
[0053]
When connecting the flange joint 10 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. , 48 with a sealing elastic sealing material (not shown) interposed between the flange 52 and the flange 48, and the bolt 64 is inserted and tightened to connect the gate valve 14 and the flange joint 10 in an airtight manner. be able to.
[0054]
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 ends of the branch pipe joint 7 in the axial direction. The reinforcing members 71 and 72 have substantially the same configuration as the reinforcing member 2 of the branch pipe joint device 1, and the reinforcing members 71 and 72 are divided into divided bodies 73 and 74 and 75 and 76, respectively. Each of the divided bodies 73 to 76 has the same configuration.
[0055]
FIG. 17 is a perspective view showing the divided body 73. In the divided body 73, the heating wire 80 is embedded in the vicinity of the entire inner peripheral surface 77 that contacts the outer peripheral surface of the tube 3 and 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, and are folded back in the axial direction. The entire side surface 78 is buried in the vicinity thereof. Both ends of the heating wire 80 are inserted in the vicinity of one end in the longitudinal direction of the divided body 73 and outward in the thickness direction from the vicinity of the central portion in the circumferential direction. Electrically connected. When such divided bodies 73 to 76 are electrofused to the pipe 3, one circumferential side surface 78 of the divided body 73 and the other circumferential side surface 70 of the divided body 74 are in contact with each other and have one longitudinal end. The split body 73 and the split body 74 are combined and electrofused so as to surround the pipe 3 so that the energizing terminals 17 and 18 provided on the part side are respectively outside the branch pipe joint 7. Similarly, the divided body 75 and the divided body 76 are also 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 outward from the branch pipe joint 7. Electrofuse. Thereafter, the branch pipe joint 7 is fixed over the reinforcing members 71 and 72. 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 abut against the outer peripheral surfaces 31 of the reinforcing members 71 and 72, respectively. The branch pipe joint 7 is fixed in an airtight manner.
[0056]
In such a branch pipe joint device 70, since the reinforcing member is not interposed in the portion corresponding to the joint portion 4 of the branch pipe joint 7, there is no need to drill the reinforcing member when drilling after fixing the branch pipe joint 7. , Workability is improved. Further, since each of the divided bodies 71 to 74 has the same configuration, it is only necessary to manufacture one type, and the configuration of the reinforcing members 71 and 72 is smaller than the configuration of the reinforcing member 2, so that the manufacturing cost is also reduced. Can do. Also in such a branch pipe joint device 70, the reinforcing members 71 and 72 are disposed in the vicinity of both ends in the axial direction of the branch pipe joint 7 on which the tightening force of the branch pipe joint 7 acts. Even if the branch pipe joint is tightened, the pipe 3 is prevented from creeping.
[0057]
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, and it should be noted that a through-hole 86 is formed in the divided body 16 at a position corresponding to the joint portion 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, the reinforcing member 85 is fixed when the branch pipe joint 7 is fixed to the reinforcing member 85 electrofused to the pipe 3 and then drilled from the joint portion 4. There is no need to perforate, only the pipe 3 need be perforated, and workability is improved. The heating wire 27 embedded in the inner peripheral surface 28 of the divided body 16 is uniformly embedded over the entire inner peripheral surface 28 avoiding the through holes 86. This prevents the perforator from cutting the heating wire 27.
[0058]
FIG. 19 is a perspective view showing a branch pipe joint device reinforcing member 90 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 members 15 and 16 are provided with reinforcing metal plates 91 and 92 such as stainless steel plates, respectively. The metal plates 91 and 92 each have a rectangular shape that curves along the divided bodies 15 and 16, and are embedded in the central portions in the thickness direction of the divided bodies 15 and 16, respectively, and are integrally formed with the divided bodies 15 and 16. By providing the metal plates 91 and 92 as described above, the strength of the reinforcing member 90 is improved, and thereby, it is ensured that the pipe 3 undergoes creep deformation when the branch pipe joint 7 is fastened and fixed to the reinforcing member 90. Is prevented. Accordingly, the thickness of the reinforcing member 90 can be reduced, and the present invention can be suitably implemented even when the distance between the outer diameter of the pipe 3 and the inner diameter of the branch pipe joint 7 is small. Such metal plates 91 and 92 each have a thickness capable of being punched by a punching machine.
[0059]
Next, the construction procedure for connecting branch pipes with constant water is shown. First, the branch pipe joint 7 is fixed after the reinforcing member 2 is electrically fused to the pipe 3. Thereafter, the flange 26 on one side of the gate valve 14 is airtightly fixed to the flange 19 of the joint portion 4 of the branch pipe joint 7 with a bolt, and a drilling machine (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 punching machine is operated, and the main shaft of the drilling machine is rotated and sent out, and the reinforcing member 2 and the pipe 3 are punched with a cutter attached to the tip of the main spindle. Then, the spindle is retracted and returned to its original position, the gate valve 41 is closed, and the punching 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 screw joint 13 of the branch pipe 9 is screwed into the pipe connection port 8 of the flange joint 10 to branch to the pipe 3. The pipe 9 is connected, and finally the gate valve 14 is opened to complete the construction.
[0060]
Further, the reinforcing member 2 of the present invention is not only used for reinforcement when the branch pipe joint 7 is fixed, but also when fixing a valve attached to the pipe with constant water or a branch pipe joint with a gate valve or the like to the pipe. It can implement suitably also as a reinforcement member. In addition, the reinforcing member 2 is not only electrically fused to the tube 3, but the reinforcing member 2 and the tube 3 may be joined by an adhesive. The pipe 3 and the reinforcing member 2 are not limited to polyethylene, but may be made of other thermoplastic synthetic resins 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 in the pipe 3 may be not only a liquid such as water but also a gas.
[0061]
【The invention's effect】
  As described above, according to the first aspect of the present invention,The reinforcing member divided body is equally divided in the circumferential direction, and the heating wire is embedded in one of the side surfaces in the circumferential direction and in the vicinity of the inner peripheral surface. Therefore, when the reinforcing member is electrofused to the pipe, the heating wire is embedded. By arranging the divided body on the outer periphery of the tube so that the side surface that is not embedded and the side surface that is not embedded are in contact with each other, the side surface and inner peripheral surface of the circumferentially adjacent divided body and the outer peripheral surface of the tube can be reliably electrofused. can do. 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. In addition, by arranging the heating wire as described above, the reinforcing member and the tube are heat-sealed almost uniformly. In addition, when the divided bodies are combined and electrically fused to the pipe, the one circumferential side surface in which the heating wire is embedded and the other circumferential end surface in which the heating wire is not embedded are in contact with each other. Provided, the side surfaces of the divided bodies that contact each other are heat-sealed almost uniformly over the entire surface.
  According to the present invention as set forth in claim 2,When a metal branch joint is attached to the pipe, the synthetic resin pipe is reinforced by the cylindrical reinforcing member, so that even if the branch joint attachment portion is firmly tightened, the synthetic resin pipe is prevented from creeping. It is. Further, when the thermoplastic synthetic resin tubular reinforcing member is attached to the synthetic resin pipe, it can be easily and reliably mounted because it is electrically fused by the heat generated by the electric heating element. In addition, the attachment of the reinforcing member by electric fusion tends to be displaced in the circumferential direction and the axial direction of the cylindrical reinforcing member. Therefore, when the branch pipe joint is attached, the displacement of the reinforcing member can be corrected and attached accurately. In this way, the branch pipe joint can be easily and accurately fixed to the synthetic resin pipe, and the workability is good.
[0062]
  And claims3According to the described invention, the reinforcing member is selected so that the inner diameter is equal to the first standard value that is the outer diameter of the pipe, and the outer diameter is equal to the second standard value that is the inner diameter of the attachment portion of the branch pipe joint. By fixing the branch pipe joint via the reinforcing member, it is not necessary to manufacture many types of branch pipe joints, thereby reducing the manufacturing cost of the branch pipe joint and improving the versatility of the branch pipe joint.
[0065]
  And claims4According to the described invention, the reinforcing member has a length equal to or longer than the length of the pipe of the attachment portion of the branch pipe joint. Therefore, when the reinforcing member is electrically welded, the reinforcing member is displaced in the axial direction of the pipe. Even if it 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 fixed accurately. In addition, since the heating wire has a strength that can be broken at the time of drilling, the heating wire does not hinder the drilling, and the reinforcing member can be reliably drilled.
[0066]
  And claims5According to the present invention described above, 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, the reinforcing member does not need to be drilled and can be easily drilled. Workability is improved.
[0067]
  And claims6According to the described invention, since the reinforcing member is disposed only at both ends in the longitudinal direction of the branch pipe joint, the branch pipe joint can be easily attached in the axial direction and the circumferential direction of the pipe after the reinforcing member is electrically fused to the pipe. It can be modified and fixed. Further, since the reinforcing member is disposed only at both ends in the longitudinal direction of the attachment portion of the branch pipe joint, it is not necessary to drill the reinforcing member at the time of drilling, and the drilling can be easily performed and workability is improved.
[0068]
  And claims7According to the described invention, the pipe connection port can be obtained simply by screwing the male screw part of the branch pipe into the female thread part formed on the inner peripheral surface of the pipe connection port part of the connected body connected to the joint part of the branch pipe. Since the minimum thickness of the pipe peripheral wall of the male screw part forming portion is the same as or greater than the wall thickness of the pipe peripheral wall other than the pipe connection region of the fluid transport pipe , The wall thickness of the pipe peripheral wall at the valley formation part of the male screw part is larger than the wall thickness of the pipe peripheral wall other than the pipe connection region of the fluid transport pipe. It can be increased to be equal to or higher than the peripheral wall of the pipe other than the region.
[0069]
Moreover, since a reinforcing cylinder is inserted in close contact with at least a part of the inner peripheral surface of the pipe corresponding to the location where the male screw part is formed, the shear strength at the site can be increased at the same time. The pipe connection region of the branch pipe, especially the male threaded part formation place, is connected to the pipe by an external force such as a tensile force or compressive force in the tube axis direction or a shearing force or bending moment in the direction intersecting the tube axis. It is possible to avoid breaking ahead of the pipe peripheral wall other than the region.
[0070]
  And claims8According to the present invention described above, a sealing elastic sealing material is piped by utilizing a screwing operation to the connecting side of the branch pipe with respect to the pipe connecting port part for connecting the pipe connecting port part and the branch pipe. Since the inner peripheral surface of the connection port and the outer peripheral surface of the branch pipe can be brought into close contact with each other in a compressed state, for example, when 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 Compared to the above, the elastic sealing material can be reliably compressed with a small operating force.
[0071]
Moreover, although the pipe peripheral wall of the branch pipe is subjected to stress concentration due to the reaction force against the compressive force of the elastic seal material, this stress is received not only by the pipe peripheral wall of the branch pipe but also by the reinforcing cylinder. It is possible to prevent the pipe peripheral wall of the transport pipe from creeping with time due to the stress.
[Brief description of the drawings]
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.
FIG. 2 is a perspective view showing a state in which a reinforcing member 2 is electrically fused to a pipe 3. FIG.
3 is a perspective view showing a state in which a branch pipe joint 7 is fixed to a reinforcing member 2. FIG.
FIG. 4 is a perspective view showing the other divided body 16;
5 is a cross-sectional view taken along the section line VV in FIG.
6 is a cross-sectional view taken along section line VI-VI in 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 taken along section line IX-IX in FIG. 8;
10 is a cross-sectional view taken along the section line XX of FIG.
11 is an exploded perspective view showing a state in which the rubber packing 42 is removed from one attachment portion 5. FIG.
FIG. 12 is a perspective view showing one mounting portion 5;
13 is a longitudinal sectional view showing a connection structure between the branch pipe 9 and the flange joint 10. FIG.
14 is a cross-sectional view taken along section line XIV-XIV in FIG. 13;
15 is an exploded perspective view of the flange joint 10, the reinforcing cylinder 62, and the screw joint 13. FIG.
FIG. 16 is a perspective view showing a branch pipe joint device 70 according to another embodiment of the present invention.
17 is a perspective view showing a divided body 73. FIG.
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 fitting device
2,85,90 Reinforcement member
3 tubes
4 Joint part
5,6 Mounting part
7 Branch fittings
8 Pipe connection port
9 Branch pipe
10 Flange joint
15, 16, 73, 74, 75, 76
27, 80 heating wire
53 Female thread
55a, 55b Elastic sealing material
57 Male thread
58 Male thread formation place
62 Reinforcing cylinder
86 Through hole

Claims (8)

A reinforcing member for a branch pipe joint that is electrically fused to the outer peripheral part of a thermoplastic synthetic resin pipe, and the branch pipe joint is fastened to the outer peripheral part and is airtightly fixed.
A plurality of divisions made of a thermoplastic synthetic resin, equally divided in the circumferential direction, having a circular cross section perpendicular to the axial direction, and surrounding the entire circumference in the circumferential direction by being arranged adjacent to the circumferential direction. Body,
A heating wire embedded in the vicinity of the entire inner peripheral surface facing the outer peripheral portion of the pipe of each divided body, and in the vicinity of the entire side surface of only one side in the circumferential direction,
The heating wire extends in the circumferential direction along the inner circumferential surface toward one circumferential side surface, bends at one bent portion where the one circumferential side surface and the inner circumferential surface are continuous, and is substantially formed on one circumferential side surface. It is folded back into a U-shape, is bent again at the one bent portion, extends in the circumferential direction toward the other circumferential side surface along the inner circumferential surface, and the other circumferential side surface and the inner circumferential surface are connected to each other. Provided from one end in the longitudinal direction of the divided body to the other end in the longitudinal direction so as to be folded back in a substantially U shape immediately before the bent portion and extend in the circumferential direction along the inner peripheral surface again,
The intervals W2 between the portions extending in the circumferential direction along the inner peripheral surface of the heating wire are all equal, and the interval W1 between the two portions close to both end surfaces in the longitudinal direction of the portions extending in the circumferential direction is the circumferential direction. A distance W3 between the folded portion and the outer circumferential surface that is folded at one circumferential side surface, and a folded portion that is folded immediately before the other bent portion. The spacing member W4 with the other bent portion is selected to be equal to or less than one half of the spacing W2 between the portions extending in the circumferential direction. A reinforcing member according to claim 1;
A mounting portion that is divided into a plurality of portions in the circumferential direction and is fastened to the outer peripheral portion of the reinforcing member to be hermetically fixed;
Min branch pipes joint device you characterized Rukoto which have a a joint portion which is formed on at least one of those mounting portions. The outer diameter of the tube has a first plurality of predetermined first standard values,
The inner diameter of the mounting portion surrounding the pipe of the branch pipe joint has a second standard value determined in advance of a second plurality of types,
The reinforcing member has one inner diameter of the first standard value, the branch pipe joint according to claim 2, wherein Rukoto is formed with a thickness having one outer diameter of the second standard value. The reinforcing member has a length equal to or longer than the length of the mounting portion along the pipe,
Heating wire, the branch pipe joint according to claim 2 or 3, wherein Rukoto to have a strength that can be separated during drilling to split body and the tube. Reinforcing member has more than a length along the tube Mounting portion of the length,
The reinforcing member, at a position corresponding to the joint portion, the branch pipe joint according to claim 2 or 3, wherein that you have been through hole is formed. Reinforcing member, the branch pipe joint according to claim 2 or 3 wherein is arranged only on both ends in the longitudinal direction along the tube of the mounting portion, characterized in Rukoto. On the outer peripheral surface of the branch pipe made of synthetic resin, a male thread portion that is screwed into the female thread portion formed on the inner peripheral surface of the pipe connection port portion of the body to be connected is projected, and the minimum wall thickness of the pipe peripheral wall at the male thread portion formation location The thickness is configured to be equal to or greater than the wall thickness of the pipe peripheral wall other than the pipe connection region of the branch pipe, and at least a portion corresponding to the male screw portion forming portion of the inner peripheral surface of the branch pipe In some, the reinforcing cylinder is inserted in close contact,
The branch pipe joint according to the object to be connected, one of the claims 2-6, characterized in be tied to the joint portion. In a portion located on the inner side of the inner peripheral surface of the pipe connection port portion on the back side, the sealing is compressed radially outward as the fluid transport tube is connected to the connection side of the pipe connection port portion. with elastic sealing material is attached, the reinforcing cylinder is, according to claim 7, characterized that you have it extends to a position corresponding to said elastic sealing member on the inner peripheral surface of the fluid transport pipe Branch pipe fitting device.

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