JP2021196011A - Pipe joint structure, and connection method for pipe joint - Google Patents

Abstract

To provide a pipe joint structure which improves workability by eliminating the need of torque management of a fastening member.SOLUTION: A pipe joint structure comprises: a socket flange 23 formed in a socket pipe 20 of a fluid pipe; a seal member 4 sealing an insertion pipe 30 which is inserted to the socket pipe 20, and the socket pipe 20; a spigot flange 5 formed integral with a spigot pipe 30 and regulating the spigot pipe 30 from being dropped out of the socket pipe 20; and a fastening member 6 fastening the socket flange 23 and the spigot flange 5. The socket flange 23 and the spigot flange 5 include insertion holes 23s and 5s through which the fastening member 6 is inserted. In a fastening state of the fastening member 6, the socket flange 23 and the spigot flange 5 are contacted with each other at an inner side RD1 of the insertion holes 23s and 5s in a pipe radial direction and in the socket flange 23 and the spigot flange 5, portions P1 at an outer side RD2 of the insertion holes 23s and 5s in the pipe radial direction are separated from each other.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a pipe joint structure and a pipe joint connection method.

The device described in Patent Document 1 is known as a seismic type branch pipe connecting device used for connecting a branch pipe to a fluid pipe such as a water pipe with uninterrupted water. As shown in FIG. 1 of Patent Document 1, the insertion tube is inserted together with the sealing member into the receiving tube of the branch pipe connecting device, the sealing member is pressed by the push ring, and the push ring and the flange of the receiving tube are bolted or the like. By fastening with the fastening member of, the receiving pipe and the insertion pipe are fixed.

However, in the pipe joint structure described in Patent Document 1, it is important to manage the torque of a plurality of fastening members so that the axis of the insertion pipe is parallel to the receiving pipe, and the construction work is complicated. Will be. In addition, there is a risk that the joint portion will bend due to a torque management error.

Japanese Unexamined Patent Publication No. 2015-166628

The present disclosure provides a pipe joint structure that improves workability without the need for torque management of fastening members, and a pipe joint connection method.

The pipe joint structure of the present disclosure includes a receiving flange formed on the receiving pipe of a fluid pipe, a sealing member for sealing between the insertion pipe inserted into the receiving pipe and the receiving pipe, and the above. An insertion flange that is formed separately or integrally with the insertion tube to prevent the insertion tube from coming out of the receiving tube, and a fastening member that fastens the receiving flange and the insertion flange. The receiving flange and the insertion flange have an insertion hole into which the fastening member is inserted, and in the fastened state of the fastening member, the receiving flange and the insertion flange are larger than the insertion hole. They come into contact with each other on the inner side in the pipe radial direction, and the portions of the receiving flange and the insertion flange on the outer side in the pipe radial direction from the insertion hole are separated from each other.

The figure which shows the receiving pipe and the insertion pipe to which the pipe joint structure of 1st Embodiment is applied. FIG. 1 is an enlarged cross-sectional view of a partially broken portion of the A1 portion in FIG. 1, showing a state in which the receiving pipe and the insertion pipe are joined by a fastening member. Sectional drawing which shows the receiving tube and the insertion tube before joining. The cross-sectional view which shows the dimensional relationship of the receiving tube, the insertion tube, and the seal member. The cross-sectional view which shows the state which the seal member is attached to the insertion tube. The figure which shows the connection method of a pipe joint. The plan view which shows the use example of the pipe joint structure of the receiving pipe and the insertion pipe of a branch pipe connecting device. The cross-sectional view which shows the pipe joint structure of 2nd Embodiment. The cross-sectional view which shows the pipe joint structure of 3rd Embodiment. The cross-sectional view which shows the pipe joint structure of 4th Embodiment.

<First Embodiment>
Hereinafter, the pipe joint structure of the first embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a diagram showing a receiving pipe 20 and an insertion pipe 30 to which the pipe joint structure of the present disclosure is applied. FIG. 2 is an enlarged cross-sectional view of a partially broken portion of the A1 portion in FIG. 1, showing a state in which the receiving pipe 20 and the insertion pipe 30 are joined by a fastening member 6. FIG. 3 is a cross-sectional view showing the receiving pipe 20 and the insertion pipe 30 before joining.

As shown in FIG. 1, the branch pipe connecting device 2 is connected to a branch case 21 that surrounds an existing pipe 1 that is a fluid pipe (water pipe), a valve device 22 that is connected to the branch case 21, and a valve device 22. It has a receiving tube 20 and the like. The pipe joint structure of the present disclosure relates to a joint structure of a receiving pipe 20 and an insertion pipe 30 of a branch pipe connecting device 2. The pipe joint structure shown in FIGS. 2 and 3 includes a receiving pipe 20 of a fluid pipe, an insertion pipe 30 inserted into the receiving pipe 20, an inner peripheral surface of the receiving pipe 20, and an outer circumference of the insertion pipe 30. It has a sealing member 4 for sealing between the surface 31, an insertion flange 5, and a fastening member 6. The fastening member 6 includes, but is not limited to, a T-shaped bolt 61 and a nut 60.

As shown in FIGS. 2 and 3, the receiving tube 20 has an inner peripheral tapered surface 20t whose inner diameter expands toward the tip of the tube, and a receiving flange 23 formed at the tip of the receiving tube 20. .. The inner diameter of the inner peripheral tapered surface 20t is widened from the first side AD1 which is the receiving tube side AD1 to the second side AD2 which is the insertion tube side AD2 in the pipe axial direction AD. The seal member 4 comes into contact with the inner peripheral tapered surface 20t. The receiving flange 23 projects in the pipe radial direction from the pipe tip of the receiving pipe 20. The receiving flange 23 has an insertion hole 23s for passing the fastening member 6. The facing surface 23a of the receiving flange 23 with respect to the insertion flange 5 is parallel to the pipe radial direction RD.

As shown in FIG. 3, the seal member 4 is made of rubber, and has a tapered seal body portion 40 in which the thickness of the pipe radial RD decreases from the insertion tube side AD2 to the first side AD1 and a seal body. It has a seal round portion 41 having a circular cross section, which is provided at the tip of the portion 40 (AD1 on the first side) and exerts a sealing function by compression. The seal main body 40 has a higher rubber hardness and is harder than the seal round portion 41 in order to transmit the pressing force received from the insertion flange 5 to the seal round portion 41. The seal round portion 41 has a lower rubber hardness and is softer than the seal main body portion 40 in order to exert a sealing function by compression deformation. The rubber hardness means the hardness measured according to the durometer hardness test (type A) of JIS K6253. The seal round portion 41 of the seal member 4 is guided to the inner side (receptacle tube side AD1) by the inner peripheral tapered surface 20t. The seal round portion 41 is compressed by the non-groove outer peripheral surface 32 and the parallel portion 20s facing parallel to the non-groove outer peripheral surface 32, which are assumed parts for the sealing function to be exerted, further behind the inner peripheral tapered surface 20t. ..

As shown in FIGS. 2 and 3, the insertion flange 5 is integrally formed with the insertion tube 30. The insertion flange 5 has an insertion hole 5s for passing the fastening member 6. The T-shaped bolt 61 of the fastening member 6 is inserted into the insertion hole 5s of the insertion flange 5 and the insertion hole 23s of the receiving flange 23, and the fastening member 6 fastens the receiving flange 23 and the insertion flange 5. , The insertion tube 30 is restricted from coming out of the receiving tube 20.

The surface 5b of the insertion flange 5 opposite to the receiving flange 23 is parallel to the pipe radial direction RD. The surface of the insertion flange 5 facing the receiving flange 23 becomes narrower along the pipe axis direction of the insertion flange 5 from the base end of the inner RD1 in the pipe radial direction toward the tip of the outer RD2 in the pipe radial direction. Has an inclined surface 5a. As a result, as shown in FIG. 2, when the insertion tube 30 is inserted into the receiving tube 20 and the fastening member 6 is fastened, the receiving flange 23 and the insertion flange 5 have larger pipe diameters than the insertion holes 23s and 5s. They come into contact with each other at the site P1 of the RD1 inside the direction. In this way, since the receiving flange 23 and the insertion flange 5 come into contact with each other, torque management of the fastening member 6 becomes unnecessary. Further, since the inclined surface 5a has a draft with respect to the mold and the insertion flange 5 has a tapered shape, it can be easily removed from the mold and the manufacturing cost can be reduced.
As shown in FIG. 2, of the receiving flange 23 and the insertion flange 5, the portions P2 of the RD2 outside the pipe radial direction from the insertion holes 23s and 5s are separated from each other. Since the gap is formed in this way, it is easy to separate the gap at the time of dismantling by inserting a tool into the gap. This gap is preferably at least 1.5 mm so that the tool can be inserted. In the case of the present embodiment, the narrowest portion of the gap in the radial outer RD2 of the insertion holes 23s and 5s is the end of the insertion holes 23s and 5s, and this portion may be equal to or more than the above value.

As shown in FIGS. 2 and 3, a groove 33 that is recessed in the inner RD1 in the radial direction of the pipe and extends in the circumferential direction of the pipe is formed in a portion of the outer peripheral surface 31 of the insertion pipe 30 corresponding to the seal member 4. .. A non-groove outer peripheral surface 32 having an outer diameter larger than that of the groove 33 is arranged on the tip end side (receiver tube side AD1) of the insertion tube 30 with respect to the groove 33. The non-groove outer peripheral surface 32 compresses the seal round portion 41 together with the parallel portion 20s. The groove 33 of the present embodiment is an annular groove extending over the entire circumference in the circumferential direction, but the groove 33 is not limited to this, and the grooves 33 may be intermittently arranged at a plurality of locations in the circumferential direction. Although they are substantially continuous over the entire circumference, they may be arranged so that only a part of them is not continuous. This groove 33 serves as a relief allowance for the seal member 4 that is compressed when the insertion tube 30 is inserted, and even if there is an assembly error or a manufacturing error between the insertion tube 30 and the receiving tube 20, the seal member 4 is grooved. It is possible to let the flanges come into contact with each other accurately by letting them escape to 33.

FIG. 3A is a cross-sectional view showing the dimensional relationship between the receiving tube, the insertion tube, and the sealing member. The upper part of FIG. 3A shows the fastening state of the insertion pipe 30 and the reception pipe 20 in which the seal member 4 is not shown. The central part of FIG. 3A is a diagram showing the size of the seal member 4 in the fastened state of the insertion tube 30 and the reception tube 20. The lower part of FIG. 3A is a diagram showing the size of the seal member 4. As shown in FIG. 3A, the length L1 along the pipe axial direction AD of the groove 33 is preferably 20% or more and 80% or less of the length L2 along the pipe axial direction AD of the seal member 4. This is to exert an appropriate sealing function. Since the seal round portion 41 is sandwiched between the non-groove outer peripheral surface 32 and the parallel portion 20s to seal, the maximum value of the length L1 of the groove 33 along the pipe axial direction AD is the seal main body portion excluding the seal round portion 41. It has a length L3 along the pipe axial direction AD of 40. The diameter (L2-L3) of the seal round portion 41 is larger than the gap between the parallel portion 20s and the non-groove outer peripheral surface 32, whereby the P3 portion of the seal round portion 41 shown in FIG. 3A is compressed and appropriately sealed. To. The length L4 of the parallel portion 20s along the pipe axial direction AD is about the same as the diameter of the seal round portion 41. The gap L5 between the facing surface 23a of the receiving flange 23 and the inclined surface 5a of the insertion flange 5 may be 1 mm or more. In this embodiment, L5 = 1.5 mm. The length L6 of the gap between the receiving flange 23 and the insertion flange 5 is 6 mm including the rounded portion of the flange angle portion, and it is preferable that the L6 is at least 5 mm.

As shown in FIG. 4, in a state where the seal member 4 is attached to the insertion tube 30, between the tip 4a of the first side AD1 of the seal member 4 and the base end 4b of the second side AD2 of the seal member 4. It is preferable that the end 33a of the first side AD1 of the groove 33 is located. As shown in FIG. 2, if the seal member 4 and the groove 33 are in the above positional relationship in the fastened state of the fastening member 6, the seal member 4 and the groove 33 will be in the state where the seal member 4 is attached to the insertion pipe 30. The above positional relationship is established. If this positional relationship is established, as shown in FIG. 4, the base end 4b (seal body portion 40) of the second side AD2 of the seal member 4 falls into the groove 33, and the tip of the first side AD1 of the seal member 4 (the tip of the seal member 4 AD1 (seal body portion 40) falls into the groove 33. A force F1 that is pressed against the radial outer side RD2 of the seal round portion 41) is generated. Therefore, the tip 4a (seal round portion 41) of the first side AD1 of the seal member 4 can be easily pressed to a desired position (non-groove outer peripheral surface 32 and parallel portion 20s), and the tip 4a of the seal member 4 required for water stoppage can be easily pressed. (Seal round portion 41) can be reliably compressed. Further, the groove 33 can suppress the compression resistance of the base end 4b (seal body portion 40) of the seal member 4, further reduce the insertion resistance, enable smooth insertion, and improve workability.

<How to connect pipe fittings>
The connection method of the pipe joint will be described. As shown in FIG. 5A, the branch pipe connecting device 2 is attached to the existing pipe 1. The valve device 22 is sandwiched between the branch case 21 while surrounding the existing pipe 1, and the branch case 21 is fixed. After that, the drilling device 7 is attached to the receiving pipe 20 to drill the existing pipe 1. After drilling, the valve of the valve device 22 is closed, and the drilling device 7 is removed from the receiving pipe 20.

Next, as shown in FIG. 4, the seal member 4 is attached to the insertion pipe 30 of the fluid pipe. Next, as shown in FIGS. 3 and 2, the insertion tube 30 is inserted into the reception tube 20 of the fluid tube, and the seal member 4 is arranged between the insertion tube 30 and the reception tube 20. Next, the receiving flange 23 formed on the receiving pipe 20 and the insertion flange 5 are fastened with the fastening member 6. 5 (b) and 2 show a pipe joint structure after fastening.

In the insertion tube 30 shown in FIG. 5B, both ends of the tube axial direction AD are insertion openings. As shown in FIG. 5 (b), after connecting the insertion tube 30 to the insertion tube 30 to the first insertion port (the insertion port of the first side AD1), the insertion tube 30 is inserted as shown in FIG. 5 (c). A second receiving tube 90 separate from the receiving tube 20 is connected to the second insertion port of the mouth tube 30 (the insertion of the second side AD2). The second insertion port of the insertion port 30 and the second receiving tube 90 are fixed by the detachment prevention device 8. The detachment prevention device 8 is arranged in a packing 8a that seals between the second insertion port and the second receiving tube, a push ring 8b that presses the packing 8a, and a push ring 8b, and is an outer peripheral surface of the second insertion port. A locking member 8c having a claw that bites into the mouth, a bolt 8d that presses the locking member 8c toward the outer peripheral surface of the second insertion port, and a second that fastens the push ring 8b and the flange of the second receiving tube 90. It has 2 fastening members 8e and 2.

<Other usage examples of the first embodiment>
6 (a) and 6 (b) are plan views showing an example of using the pipe joint structure of the receiving pipe 20 and the insertion pipe 30 of the branch pipe connecting device 2. As another usage example 1, as shown in FIG. 6A, even if a receiving pipe 92 (bend pipe) having a bend portion 91 for changing the direction of the flow path is connected as the second receiving pipe. good. The outer diameter of the insertion tube 30 shown in FIG. 6A is D1.

As another usage example 2, as shown in FIG. 6 (b), a second receiving tube is connected by connecting an insertion tube 30'with an outer diameter D2 smaller than that of the insertion tube 30 shown in FIG. 6 (a). As a result, a receiving pipe 92'having a bend portion 91 that changes the direction of the flow path may be connected. By doing so, by using the insertion pipe 30'(diameter drop) having an outer diameter D2 smaller than the outer diameter D1 shown in FIG. 6A as the insertion pipe 30, the branch pipe (receptacle pipe) can be used. Even when the diameter of 92') is reduced, the branch pipe connecting device 2 (branch case 21, valve device 22 and receiving pipe 20) can be diverted.

<Second Embodiment>
FIG. 7 is a cross-sectional view showing the pipe joint structure of the second embodiment. In the first embodiment shown in FIG. 2, the insertion flange 5 and the insertion tube 30 are integrally formed, but in the second embodiment shown in FIG. 7, the insertion flange 105 and the insertion tube 130 are separate. The body. As shown in FIG. 7, the insertion flange 105 is a non-divided push ring which is arranged on the inner RD1 in the pipe radial direction of the insertion pipe 130 and has a continuous annular shape in the pipe circumferential direction. The insertion tube 130 has a protrusion 135 protruding in the radial direction of the tube. The insertion flange 105 has a regulating surface 150 that contacts the protrusion 135 of the insertion tube 130 and restricts the insertion tube 130 from coming off. The insertion flange 105 has a stepped portion forming the regulation surface 150. In the fastened state of the fastening member 6, a step portion (regulating surface 150) is positioned on the insertion tube side AD2 of the protrusion 135 to prevent the insertion tube 130 from being pulled out. Since the insertion flange 105 is a non-divided body, it is inserted into the insertion tube 30 from the insertion tube side AD2 (second side AD2). The insertion flange 105 comes into contact with the receiving flange 23 at the portion P1 of the RD1 inside the pipe radial direction from the insertion hole of the fastening member 6, and other configurations are the same as those of the first embodiment.

In the second embodiment, the protrusion 135 and the insertion tube 130 are integrally formed, but they may be separate bodies. In that case, it is conceivable that a groove is formed on the outer peripheral surface of the insertion tube 130, and the ring member as a protrusion is fitted in the groove.

Further, in the embodiment shown in FIG. 7, the protrusion 135 is arranged on the inner side in the pipe radial direction with respect to the portion P1, but the protrusion 135 may have a height in contact with the portion P1. As a result, when a force is applied to the insertion tube 130 to enter the receiving tube, the insertion tube 130 comes into direct contact with the insertion tube and the entry is suppressed.

<Third Embodiment>
FIG. 8 is a cross-sectional view showing the pipe joint structure of the third embodiment. As shown in FIG. 8, in the third embodiment, the insertion flange 205 and the insertion tube 230 are separate bodies. The insertion flange 205 is a push ring of a split body arranged on the inner RD1 in the pipe radial direction of the insertion pipe 230 and adjacently arranged along the pipe circumferential direction. In the present embodiment, the number of divisions is two, but if there are a plurality of divisions, the number of divisions can be changed. The insertion tube 230 has a protrusion 235 protruding in the radial direction RD. The insertion flange 205 comes into contact with the regulation surface 250 that contacts the protrusion 235 of the insertion tube 230 to prevent the insertion tube 230 from coming off, and the insertion tube 230 that comes into contact with the protrusion 235 of the insertion tube 230 to receive the socket. It has a second regulatory surface 251 that regulates entry into the tube 20. The insertion flange 205 has a groove forming the regulation surface 250 and the second regulation surface 251. By inserting the protrusion 235 into the groove of the insertion flange 205 in the fastened state of the fastening member 6, the regulation surface 250 is positioned on the insertion tube side AD2 of the protrusion 235 to prevent the insertion tube 230 from coming off. , The second regulating surface 251 is positioned on the receiving tube side AD1 of the protrusion 235 to prevent the insertion tube 230 from being excessively inserted. Since the insertion flange 205 is a split body, the insertion flange 205 is attached to the insertion tube 230 from the outer RD2 in the pipe radial direction. The insertion flange 205 is in contact with the receiving flange 23 at the portion P1 of the RD1 inside the pipe radial direction from the insertion hole of the fastening member 6, and other configurations are the same as those of the first embodiment.

In the third embodiment, the protrusion 235 and the insertion tube 230 are integrally formed, but they may be separate bodies. In that case, it is conceivable that a groove is formed on the outer peripheral surface of the insertion tube 230, and the ring member as a protrusion is fitted in the groove.

<Fourth Embodiment>
FIG. 9 is a cross-sectional view showing the pipe joint structure of the fourth embodiment. As shown in FIG. 9, in the fourth embodiment, the insertion flange 305 and the insertion tube 330 are separate bodies. The insertion flange 305 is a push ring of a split body arranged on the inner RD1 in the pipe radial direction of the insertion pipe 330 and adjacently arranged along the pipe circumferential direction. In the present embodiment, the number of divisions is two, but if there are a plurality of divisions, the number of divisions can be changed. The insertion flange 305 has a protrusion 335 protruding in the radial direction RD. A groove 352 is formed on the outer peripheral surface of the insertion tube 330. The insertion tube 330 comes into contact with the regulation surface 350 that comes into contact with the protrusion 335 of the insertion flange 305 to prevent the insertion tube 330 from coming off, and the insertion tube 330 comes into contact with the protrusion 335 of the insertion flange 305 and the insertion tube 330 receives the socket. It has a second regulatory surface 351 that regulates entry into the tube 20. In the fastened state of the fastening member 6, the protrusion 335 of the insertion flange 305 is inserted into the groove 352 of the insertion tube 330, so that the regulation surface 350 is positioned on the receiving tube side AD1 of the protrusion 335 and the insertion tube 330. The second regulating surface 351 is positioned on the insertion tube side AD2 of the protrusion 335 to prevent the insertion tube 330 from being excessively inserted. Since the insertion flange 305 is a divided body, the insertion flange 305 is attached to the insertion tube 330 from the outer RD2 in the pipe radial direction. The insertion flange 305 contacts the receiving flange 23 at the portion P1 of the RD1 inside the pipe radial direction from the insertion hole of the fastening member 6, and other configurations are the same as those of the first embodiment.

<Modification example>
The pipe joint structure of the first to fourth embodiments has the following configurations (1) to (4).
(1) In the fastened state of the fastening member 6, the receiving flange and the insertion flange are configured to be in contact with each other on the inner side in the pipe radial direction from the insertion hole. Configuration in which the portions P2 of the outer RD2 in the pipe radial direction are separated from each other (3) A groove 33 recessed in the inner RD1 in the pipe radial direction and extending in the circumferential direction is provided in the portion corresponding to the seal member 4 on the outer peripheral surface of the insertion tube. Formed configuration (4) The surface of the insertion flange facing the receiving flange is along the pipe axial direction AD of the insertion flange as it goes from the base end of the inner RD1 in the pipe radial direction to the tip of the outer RD2 in the pipe radial direction. However, in the pipe joint structure of the present disclosure, at least one of the above configurations (1) to (4) may be adopted, and the above configurations (1) to The combination of (4) can be changed arbitrarily.

As described above, the pipe joint structure of the first, second, third or fourth embodiment is not particularly limited, but has a receiving flange 23 formed on the receiving pipe 20 of the fluid pipe and the receiving pipe 20. The sealing member 4 that seals between the insertion tube (30, 30', 130, 230, 330) and the receiving tube 20 to be inserted into the insertion tube (30, 30', 130, 230, 330). An insertion flange (5,105,205,305) and a receiver, which are formed separately or integrally with the insertion flange (30, 30', 130, 230, 330) to prevent the insertion tube (30, 30', 130, 230, 330) from coming out of the receiving tube 20. A fastening member 6 for fastening the opening flange 23 and the insertion flange (5,105,205,305) is provided, and the receiving flange 23 and the insertion flange (5,105,205,305) are the fastening member 6. Has an insertion hole 23s, 5s into which the flange is inserted, and in the fastened state of the fastening member 6, the receiving flange 23 and the insertion flange (5, 105, 205, 305) are in the pipe radial direction with respect to the insertion holes 23s, 5s. The inner RD1 is in contact with each other, and the portions P2 of the outer RD2 in the pipe radial direction from the insertion holes 23s and 5s of the receiving flange 23 and the insertion flanges (5, 105, 205, 305) are separated from each other.

Although not particularly limited, the method of connecting the pipe joint of the first, second, third or fourth embodiment is to attach the seal member 4 to the insertion pipe (30, 30', 130, 230, 330) of the fluid pipe. And the opening tube (30, 30', 130, 230, 330) is inserted into the receiving tube 20 of the fluid tube, and the insertion tube (30, 30', 130, 230, 330) and the receiving port are inserted. The step of arranging the seal member 4 between the tube 20 and the insertion tube (30, 30', 130, 230, 330) is formed separately or integrally with the insertion tube (30, 30', 130, A step of fastening the insertion flange (5,105,205,305) that restricts the 230,330) from coming out of the receiving tube 20 and the receiving flange 23 formed on the receiving tube 20 with the fastening member 6. The receiving flange 23 and the insertion flange (5, 105, 205, 305) have insertion holes 23s and 5s into which the fastening member 6 is inserted, and the receiving flange 23 and the insertion flange (5, 105, 205, 305) have the receiving holes 23s and 5s in which the fastening member 6 is inserted. The flange 23 and the insertion flange (5,105,205,305) are in contact with each other at the inner RD1 in the pipe radial direction from the insertion holes 23s and 5s, and the receiving flange 23 and the insertion flange (5,105,205,305) are in contact with each other. ), The portions P2 of the RD2 outer in the pipe radial direction from the insertion holes 23s and 5s are separated from each other.

In this way, the receiving flange 23 and the insertion flanges (5, 105, 205, 305) fastened by the fastening member 6 come into contact with each other, so that torque management of the fastening member 6 becomes unnecessary. It is possible to prevent the joint from bending due to a torque management error. Further, since the RD2 on the outer side in the pipe radial direction of the flanges are separated from each other by the insertion holes 23s and 5s, they can be detached by inserting a tool at the time of disassembly, and workability is improved.

Although not particularly limited, a portion of the outer peripheral surface 31 of the insertion tube (30, 30', 130, 230, 330) corresponding to the seal member 4 as in the first, second, third or fourth embodiment. Is preferably formed with a groove 33 recessed in the inner RD1 in the radial direction of the pipe and extending in the circumferential direction of the pipe.

According to this configuration, the seal member 4 is compressed when the insertion tube (30, 30', 130, 230, 330) is inserted, and the groove 33 becomes an escape space for the compressed seal member 4. Even if there is an assembly error or a manufacturing error between the pipe (30, 30', 130, 230, 330) and the receiving pipe 20, the sealing member 4 can be released to the groove and the flanges can be brought into contact with each other.
The groove 33 increases the gap between the receiving tube 20 and the insertion tube (30, 30', 130, 230, 330), reduces the insertion resistance due to the sealing member 4, allows smooth insertion, and improves workability. It is possible to make it.

Although not particularly limited, as in the first, second, third or fourth embodiment, the receiving tube side of the tube axial direction AD is the first side AD1, and the insertion tube side of the tube axial direction AD is the first. It is a two-sided AD2, and the end 33a of the first side AD1 of the groove 33 may be located between the tip 4a of the first side AD1 of the seal member 4 and the base end 4b of the second side AD2 of the seal member 4. preferable.

According to this configuration, the base end 4b (seal body portion 40) of the second side AD2 of the seal member 4 falls into the groove 33, and the tip 4a (seal round portion 41) of the first side AD1 of the seal member 4 is piped. Since the force F1 that presses against the radial outer RD2 is generated, it becomes easy to press the tip 4a of the first side AD1 of the seal member 4 to a desired position, and the tip 4a of the seal member 4 required for water stoppage is reliably compressed. It becomes possible.
The groove 33 can suppress the compression resistance of the base end 4b of the seal member 4, further reduce the insertion resistance, enable smooth insertion, and improve workability.

Although not particularly limited, as in the first embodiment, the insertion flange 5 and the insertion tube 30 are integrally formed, and the surface of the insertion flange 5 facing the receiving flange 23 is the inner RD1 in the pipe radial direction. It is preferable to have the inclined surface 5a so that the width of the insertion flange 5 along the pipe axial direction AD becomes narrower toward the tip of the outer RD2 in the pipe radial direction from the base end of the pipe.

According to this configuration, since the inclined surface 5a has a draft with respect to the mold and the insertion flange 5 has a tapered shape, it can be easily removed from the mold and the manufacturing cost can be reduced.

Although not particularly limited, as in the second to fourth embodiments, the insertion flange (105, 205, 305) and the insertion tube (130, 230, 330) are separate bodies, and the insertion flange (105, 205) is provided. , 305) and one of the insertion tubes (130,230,330) has protrusions (135,235,335), and the insertion flange (105,205,305) and the insertion tube (130,230, It is preferable that any one of the 330) has a regulating surface (150, 250, 350) that contacts the protrusion (135, 235, 335) and restricts the insertion tube (130, 230, 330) from coming off.

According to this configuration, the insertion flange can be easily attached to the insertion pipe, and the construction work can be facilitated.

Although not particularly limited, the pipe joint structure of the first, second, third or fourth embodiment includes a receiving flange 23 formed in the receiving pipe 20 of the fluid pipe and an insertion inserted into the receiving pipe 20. The sealing member 4 that seals between the mouth tube (30, 30', 130, 230, 330) and the receiving tube 20 and the insertion tube (30, 30', 130, 230, 330) are separated or Insertion flanges (5,105,205,305), which are integrally formed to prevent the insertion tube (30, 30', 130, 230, 330) from coming out of the receiving tube 20, and the receiving flange 23 are inserted. A fastening member 6 for fastening the opening flange (5,105,205,305) is provided, and the receiving flange 23 and the insertion flange (5,105,205,305) are inserted through which the fastening member 6 is inserted. It has holes 23s and 5s, and in the fastened state of the fastening member 6, the receiving flange 23 and the insertion flange (5,105,205,305) are in contact with each other at the inner RD1 in the pipe radial direction with respect to the insertion holes 23s and 5s. On the outer peripheral surface 31 of the insertion tube (30, 30', 130, 230, 330), a groove 33 recessed in the inner RD1 in the radial direction of the tube and extending in the circumferential direction is formed on the portion corresponding to the seal member 4. Has been done.

Although not particularly limited, the method of connecting the pipe joint of the first, second, third or fourth embodiment is to attach the seal member 4 to the insertion pipe (30, 30', 130, 230, 330) of the fluid pipe. And the insertion tube (30, 30', 130, 230, 330) is inserted into the receiving tube 20 of the fluid tube, and the insertion tube (30, 30', 130, 230, 330) and the receiving port are inserted. The step of arranging the seal member 4 between the tube 20 and the insertion tube (30, 30', 130, 230, 330) is formed separately or integrally with the insertion tube (30, 30', 130, A step of fastening the insertion flange (5,105,205,305) that restricts the 230,330) from coming out of the socket 20 and the socket flange 23 formed on the socket 20 with the fastening member 6. The receiving flange 23 and the insertion flange (5, 105, 205, 305) have insertion holes 23s and 5s into which the fastening member 6 is inserted, and the receiving flange 23 and the insertion flange (5, 105, 205, 305) have the receiving holes 23s and 5s in which the fastening member 6 is inserted. The flange 23 and the insertion flange (5, 105, 205, 305) come into contact with each other at the inner RD1 in the pipe radial direction from the insertion holes 23s, 5s, and the insertion tube (30, 30', 130, When the 230,330) is inserted, the portion of the outer peripheral surface 31 of the insertion tube (30, 30', 130, 230, 330) corresponding to the seal member 4 is recessed in the inner RD1 in the pipe radial direction and is a pipe. A groove 33 extending in the circumferential direction is formed.

In this way, the receiving flange 23 and the insertion flanges (5, 105, 205, 305) fastened by the fastening member 6 come into contact with each other, so that torque management of the fastening member 6 becomes unnecessary. It is possible to prevent the joint from bending due to a torque management error.
When the insertion tube (30, 30', 130, 230, 330) is inserted, the seal member 4 is compressed, and the groove 33 becomes an escape space for the compressed seal member 4, so that the insertion tube (30, 30') is used. , 130, 230, 330) and the receiving tube 20 can be brought into contact with each other by allowing the sealing member 4 to escape to the groove even if there is an assembly error or a manufacturing error.
The groove 33 increases the gap between the receiving tube 20 and the insertion tube (30, 30', 130, 230, 330), reduces the insertion resistance due to the sealing member 4, allows smooth insertion, and improves workability. It is possible to make it.

Although not particularly limited, as in the first, second, third or fourth embodiment, in the insertion tube (30, 30', 130, 230, 330), both ends of the tube axial direction AD are insertion openings. , After connecting the first insertion port of the insertion tube (30, 30', 130, 230, 330) to the receiving tube 20, the second insertion port of the insertion tube (30, 30', 130, 230, 330). The insertion port may be connected to a second receiving tube 90 separate from the receiving tube 20.

By doing so, even if the pipe to be connected to the branch pipe connecting device 2 is the receiving pipe 92, it is not necessary to design a separate branch pipe connecting device 2 in which the receiving pipe 20 is used as the insertion pipe. Even if the branch pipe connecting device 2 having the mouth pipe 20 is used, the receiving pipe 92 can be connected, so that the device can be shared and the inventory cost and the design cost can be reduced.

Although the embodiments of the present disclosure have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments. The scope of the present disclosure is set forth not only by the description of the embodiment described above but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

It is possible to adopt the structure adopted in each of the above embodiments in any other embodiment. The specific configuration of each part is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present disclosure.

20 ... Receptacle tube 23 ... Receptacle flange 23s ... Insertion hole 30, 30', 130, 230, 330 ... Insertion tube 33 ... Groove 4 ... Seal member 5,105, 205, 305 ... Insertion flange 5s ... Insertion hole 6 ... Fastening member 135, 235, 335 ... Protrusion 150, 250, 350 ... Regulatory surface RD ... Pipe radial direction RD1 ... Pipe radial direction inside RD2 ... Pipe radial direction outside AD ... Pipe axial direction AD1 ... First side (receptacle pipe) side)
AD2 ... 2nd side (insertion tube side)

Claims (9)

A receiving flange formed on the receiving pipe of the fluid pipe, a sealing member for sealing between the insertion pipe inserted into the receiving pipe and the receiving pipe, and the insertion pipe separately or separately. It is provided with an insertion flange that is integrally formed to prevent the insertion pipe from coming out of the reception pipe, and a fastening member that fastens the reception flange and the insertion flange.
The receiving flange and the insertion flange have an insertion hole into which the fastening member is inserted.
In the fastened state of the fastening member, the receiving flange and the insertion flange are in contact with each other on the inner side in the pipe radial direction from the insertion hole, and the receiving flange and the insertion flange are more piped than the insertion hole. A pipe joint structure in which the radially outer parts are separated from each other. The pipe joint structure according to claim 1, wherein a groove corresponding to the seal member is formed on the outer peripheral surface of the insertion pipe, which is recessed inward in the pipe radial direction and extends in the pipe circumferential direction. The receiving pipe side in the pipe axial direction is the first side, the insertion pipe side in the pipe axial direction is the second side, and the tip of the first side of the sealing member and the first side of the sealing member. The pipe joint structure according to claim 2, wherein the first end of the groove is located between the two base ends. The insertion flange and the insertion tube are integrally formed, and the surface of the insertion flange facing the receiving flange is said to be oriented from the base end on the inner side in the pipe radial direction to the tip on the outer side in the pipe radial direction. The pipe joint structure according to any one of claims 1 to 3, which has an inclined surface so that the width of the insertion flange along the pipe axis direction is narrowed. The insertion flange and the insertion tube are separate bodies, one of the insertion flange and the insertion tube has a protrusion, and one of the insertion flange and the insertion tube is the other. The pipe joint structure according to any one of claims 1 to 3, which has a regulating surface for restricting the insertion tube from coming out in contact with the protrusion. The process of attaching the seal member to the insertion pipe of the fluid pipe,
A step of inserting the insertion tube into the receiving tube of the fluid pipe and arranging the sealing member between the insertion tube and the receiving tube.
An insertion flange formed separately or integrally with the insertion tube to prevent the insertion tube from coming out of the reception tube and a reception flange formed on the reception tube are fastened with a fastening member. Including the process of
The receiving flange and the insertion flange have an insertion hole into which the fastening member is inserted.
In the fastened state of the fastening member, the receiving flange and the insertion flange are in contact with each other on the inner side in the pipe radial direction from the insertion hole, and the receiving flange and the insertion flange are more piped than the insertion hole. A method of connecting pipe fittings in which the radially outer parts are separated from each other. Both ends of the insertion tube in the direction of the tube axis are insertion holes.
A request for connecting the first insertion port of the insertion tube to the reception tube and then connecting the second insertion port of the insertion tube to a second reception tube separate from the reception tube. Item 6. The method for connecting a pipe joint according to Item 6. A receiving flange formed on the receiving pipe of the fluid pipe, a sealing member for sealing between the insertion pipe inserted into the receiving pipe and the receiving pipe, and the insertion pipe separately or separately. It is provided with an insertion flange that is integrally formed to prevent the insertion pipe from coming out of the reception pipe, and a fastening member that fastens the reception flange and the insertion flange.
The receiving flange and the insertion flange have an insertion hole into which the fastening member is inserted.
In the fastened state of the fastening member, the receiving flange and the insertion flange come into contact with each other on the inner side in the pipe radial direction with respect to the insertion hole.
A pipe joint structure in which a groove corresponding to the seal member is formed on the outer peripheral surface of the insertion pipe, which is recessed inward in the radial direction of the pipe and extends in the circumferential direction of the pipe. The process of attaching the seal member to the insertion pipe of the fluid pipe,
A step of inserting the insertion tube into the receiving tube of the fluid pipe and arranging the sealing member between the insertion tube and the receiving tube.
An insertion flange formed separately or integrally with the insertion tube to prevent the insertion tube from coming out of the reception tube and a reception flange formed on the reception tube are fastened with a fastening member. Including the process of
The receiving flange and the insertion flange have an insertion hole into which the fastening member is inserted.
In the fastened state of the fastening member, the receiving flange and the insertion flange come into contact with each other on the inner side in the pipe radial direction with respect to the insertion hole.
When the insertion tube is inserted into the receiving tube, a groove is formed in the outer peripheral surface of the insertion tube corresponding to the seal member, which is recessed inward in the radial direction of the tube and extends in the circumferential direction of the tube. How to connect pipe fittings.

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