JP2002174376A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint capable of being smoothly inserted to the inner cylinder part at the end of a resin pipe without causing a trouble such as damage or the like in a seal member and preventing the leak of liquid as transporting fluid even if the pressure of the liquid is high. SOLUTION: This joint 12 comprises a substantially cylindrical joint body 13, an annular split ring 14 cut in a part, an annular washer 15, and a push ring 16 formed of a nut. An insert hole 23 is bored on the resin pipe inserting end side of the joint body 13, and a substantially cylindrical inner cylinder part 25 is extended from the center of the insert hole 23. A housing groove 32 is provided in the tip-side circumferential surface of the inner cylinder part 25, and four seal rings 33 are fitted to the housing groove 32. The thickness of the seal rings 33 is set equal to the depth of the housing groove 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for a resin pipe used for water pipes, hot water pipes, floor heating, road heating, and the like.

[0002]

2. Description of the Related Art Conventionally, this type of joint has a tubular shape, into which a resin pipe can be inserted, a push ring screwed into a resin pipe insertion end of the joint body, and a push body. It mainly comprises a split ring as a retaining member interposed between the ring and the ring. An inner cylindrical portion into which the end of the resin pipe is inserted is protruded inside the joint main body, and a receiving groove is formed in the outer peripheral surface of a distal end portion of the inner cylindrical portion. Further, one sealing ring having a circular cross section made of a rubber material as a sealing member is fitted into the housing groove.
The distal end of the seal ring is formed so as to protrude from the outer peripheral surface of the inner cylinder.

When a resin pipe is connected to a joint, first, a split ring and a washer are arranged at the resin pipe insertion end of the joint body, and then the push ring is loosely screwed. Next, the end of the resin pipe is inserted into the joint body, and the end of the resin pipe is inserted into the inner cylinder. Next, the push ring screwed into the resin pipe insertion end of the joint body is further tightened. At this time, the split ring is pushed into the inside of the joint body. The outer peripheral surface of the split ring is engaged with the inner peripheral surface of the joint body to reduce the diameter of the split ring, so that the inner peripheral surface of the split ring is pressed against and engaged with the outer peripheral surface of the resin pipe. Is done. For this reason, the resin pipe is prevented from falling into the joint body. At the same time, the inner peripheral surface of the resin pipe presses against the distal end of the seal ring, and the space between the distal end of the seal ring and the inner peripheral surface of the resin pipe is sealed.

[0004]

However, in this conventional joint, when the pressure of the liquid as the transport fluid is high, the adhesion between the tip of the seal ring and the inner peripheral surface of the resin pipe is low. However, there is a problem in that the liquid flows out between the distal end of the seal ring and the inner peripheral surface of the resin pipe and leaks from the distal end of the joint.

When the end of the resin pipe is inserted into the inner cylindrical portion, the end of the resin pipe comes into contact with the tip of the seal ring, which makes it difficult to insert and insert the resin pipe. If the end of the resin pipe is further inserted into the inner cylinder while the abutment is in contact with the tip of the seal ring, the seal ring may be pushed inward into the joint body or may be damaged. There was a problem that there is.

In order to solve the above problems, FIG.
As shown by the solid line in (b), a seal ring 48 having a rectangular cross section made of a rubber material and having a thickness set to be the same as the depth of the accommodation groove 47 is fitted into the wide accommodation groove 47. It is possible. With this configuration, the distal end portion of the resin pipe 49 can be smoothly inserted into the inner cylindrical portion without causing any trouble such as damage to the seal ring 48.

Further, when the pressing ring is further tightened after the end of the resin pipe 49 is inserted into the joint body, the split ring is pressed against and engaged with the outer peripheral surface of the resin pipe, and the resin pipe is connected to the split ring. Is pressed inward by the pressure contact.

For this reason, as shown by a two-dot chain line in FIG. 4B, the inner peripheral surface of the resin pipe 49 is pressed against the outer peripheral surface of the seal ring 48. However, when the pressure of the liquid is high, the liquid flows between the outer peripheral surface of the seal ring 48 and the resin pipe 4.
There is a problem that the fluid flows out between the inner peripheral surface of the joint 9 and leaks from the distal end portion of the joint.

The present invention has been made by focusing on the problems existing in the prior art as described above. The purpose is to ensure that the end of the resin pipe can be smoothly inserted into the inner cylinder without any trouble such as damage to the sealing member, and that the pressure of the liquid as the transport fluid is high. Another object of the present invention is to provide a joint capable of preventing liquid leakage.

[0010]

In order to achieve the above object, the joint according to the first aspect of the present invention has a tubular shape.
A joint body into which a resin pipe can be inserted, an inner cylindrical portion protruding from the inside of the joint body, into which an end of the resin pipe is inserted, and a receiving groove recessed in an outer peripheral surface of the inner cylindrical portion. A sealing member to be attached, and fastening means for tightening the resin pipe by applying an external force to the resin pipe, wherein the sealing member is provided with a plurality of engaging projections, and the resin pipe has an inner cylindrical portion. When the resin pipe is tightened by the tightening means, the distal end of the engaging convex portion is configured to restrict the protrusion of the engaging convex portion from the outer peripheral surface of the inner cylindrical portion. The portion is configured to be pressed against the inner peripheral surface of the resin pipe.

[0011] In the joint according to the second aspect of the present invention, in the invention according to the first aspect, the tightening means increases the diameter of the joint body toward the end on the inner peripheral surface of the resin pipe insertion end. And a push ring screwed into the resin pipe insertion end of the joint body, and a tapered outer periphery interposed between the joint body and the push ring and corresponding to the taper surface. And an annular retaining member for retaining the resin pipe into the joint body by applying an external force to the resin pipe by screwing the push ring into the joint body.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below in detail with reference to FIGS. As shown in FIG. 5, the resin pipe 11 is formed of a synthetic resin such as polyolefin (cross-linked polyethylene, polybutene, etc.) into a cylindrical shape, and is used for water supply piping and the like.

The joint 12 has a substantially cylindrical joint body 13.
And a split ring 14 as an annular fastening means having one part cut off, an annular washer 15 and a pressing ring 16 as a fastening means made of a nut. The joint body 13, the split ring 14, the washer 15, and the pressing ring 16 are formed of a metal material such as an alloy (brass, bronze, or the like).

As shown in FIG. 1 to FIG.
A first external thread portion 17 is formed on the outer peripheral surface of the base end portion,
It can be screwed into a pipe such as a water pipe. In addition, an introduction path 18 is formed on the inner peripheral surface of the proximal end portion of the joint body 13. When the joint body 13 is screwed into the pipe, the introduction path 18 allows a liquid as a transport fluid to flow.

On the outer peripheral surface at the substantially central portion of the joint body 13,
A first engaging portion 19 having a hexagonal nut shape is formed. When the joint body 13 and the tube are screwed together and released, the joint body 13 can be easily rotated by engaging a wrench or the like with the first engagement portion 19. Has become.

As shown in FIGS. 1 and 5, the first engaging portion 1
9 has a through hole 20 having a substantially circular plane shape for visually checking the insertion depth of the resin pipe 11 into the joint body 13.
It is formed in places. As shown in FIGS. 1 to 3, the outer peripheral surface of the resin pipe insertion end 21 of the joint body 13 is provided with a second
An external thread portion 22 is formed. Further, an insertion hole 23 for inserting the resin pipe 11 is formed in the joint body 13 on the resin pipe insertion end side. On the inner peripheral surface of the opening of the insertion hole 23, a first tapered surface 24 whose diameter increases toward the end is formed.

At the center of the insertion hole 23, a substantially cylindrical inner cylindrical portion 25 extends from an intermediate portion in the axial direction of the joint body 13 toward the resin pipe insertion end 21 of the joint body 13. I have. A second tapered surface 26 whose diameter decreases toward the end is formed on the outer peripheral edge of the distal end of the inner cylindrical portion 25 so that the end of the resin pipe 11 can be easily inserted into the inner cylindrical portion 25. It has become.

An annular insertion space 27 for inserting the resin pipe 11 into the joint body 13 is formed between the inner peripheral surface of the insertion hole 23 and the inner cylindrical portion 25. Further, an inclined wall 28 whose diameter is reduced toward the inner end is formed in the inner part of the insertion hole 23. Further, an annular reduced diameter portion 29 whose outer diameter is smaller than the opening side of the insertion hole 23 is formed on the inner end side of the inclined wall 28 of the insertion hole 23. Reduced diameter part 2
9 is fitted with an O-ring 30 made of a rubber material and having a circular cross section. The push ring 16 is connected to the joint body 1.
When the resin pipe 11 is tightened, the end face 31 of the resin pipe 11 is pressed against the O-ring 30 to seal between the end face 31 of the resin pipe 11 and the inner end wall of the reduced diameter portion 29.

On the outer peripheral surface on the distal end side of the inner cylindrical portion 25, a housing groove 32 for housing a seal member is formed so as to be concave over the entire circumference so as to be orthogonal to the axis of the inner cylindrical portion 25. FIG.
As shown by the solid line in FIG. 4A, four seal rings 33 as a seal member having a circular cross section made of a rubber material are fitted in the accommodation groove 32. The outer diameter of these seal rings 33 is the same length as the outer diameter of the inner cylindrical portion 25,
That is, the thickness of the seal ring 33 is set so as to be the same as the depth of the accommodation groove 32. And
When the end portion of the resin pipe 11 is inserted into the inner cylindrical portion 25, the end surface 31 of the resin pipe 11 does not contact the distal end portion 34 of each seal ring 33, that is, the outer peripheral portion of the seal ring 33. .

As shown in FIG. 1 and FIG.
A female screw portion 35 is threaded on the inner peripheral surface of the base end portion 6 so that it can be screwed with the second male screw portion 22 of the joint body 13. A hexagon nut-shaped second engagement portion 36 is formed on the entire outer circumference of the press ring 16. When the push ring 16 and the joint body 13 are screwed and released, the push ring 16 can be easily rotated by engaging a wrench or the like with the second engagement portion 36. Has become.

As shown in FIG. 5, an insertion hole 37 is formed in the center of the distal end of the push ring 16 so as to penetrate the push ring 16. Further, a locking surface 38 is formed in an annular shape so as to be orthogonal to the axis of the push ring 16 on the tip side of the female screw portion 35 inside the push ring 16. On the inner peripheral surface of the distal end portion of the press ring 16, a housing recess 39 is provided over the entire circumference. The joint 12 of the resin pipe 11 is
An escape prevention ring 40 made of a rubber material and having a circular cross section for preventing escape from the body is fitted.

As shown in FIGS. 1 and 5, the split ring 14 is formed with a single cut extending in the axial direction.
The diameter can be reduced when a force is applied from the outside toward the radial inside.

The outer peripheral surface of the split ring 14 is
The third tapered surface 41 corresponds to the third first tapered surface 24. On the inner peripheral surface of the split ring 14, an uneven surface for preventing the resin pipe 11 from falling into the joint body 13 is formed over the entire surface. The washer 15
Is interposed between the split ring 14 and the locking surface 38 of the press ring 16.

Next, the operation of the joint 12 configured as described above will be described. When the resin pipe 11 is connected to the joint 12, first, the split ring 14 and the washer 15 are arranged at the resin pipe insertion end 21 of the joint body 13, and then the push ring 16 is loosely screwed.

Then, as shown in FIGS. 2 and 3, the end of the resin pipe 11 is inserted into the insertion space 27 in the joint body 13 from the insertion hole 37, and the end of the resin pipe 11 is inserted into the inner cylindrical portion 25. Insert into. At this time, since the thickness of each seal ring 33 is the same length as the depth of the accommodation groove 32, the end face 31 of the resin pipe 11 does not abut on the distal end portion 34 of each seal ring 33, The end of the resin pipe 11 is smoothly inserted into the inner cylindrical portion 25.

As shown in FIG. 3, when the end face 31 of the resin pipe 11 reaches the end face of the inclined wall 28 on the resin pipe insertion end side, the insertion of the joint body 13 at the end of the resin pipe 11 is performed through the through hole 20. The insertion depth into the space 27 can be visually recognized.

Next, as shown in FIG. 1, when the push ring 16 is tightened to the joint body 13 using a tool such as a spanner, the locking surface 38 of the push ring 16 is attached to the resin pipe insertion end 21 of the joint body 13. To approach, the split ring 14 is pushed into the proximal end side of the joint body 13 via the washer 15. For this reason, the third tapered surface 41 of the split ring 14 is engaged with the first tapered surface 24 of the joint body 13, and the diameter of the split ring 14 is reduced. Thereby, the inner peripheral surface of the split ring 14 is brought into pressure contact with and engaged with the outer peripheral surface of the resin pipe 11. As a result, the resin pipe 11 is firmly prevented from falling into the joint body 13.

At the same time, the resin pipe 11 is
4 is pushed into the reduced diameter portion 29 in the joint body 13 while being held by the
Because it is pressed against the ring 30, the space between the inner end wall of the reduced diameter portion 29 and the end face 31 of the resin pipe 11 is sealed.

When the split ring 14 is pressed against and engaged with the outer peripheral surface of the resin pipe 11, the resin pipe 11 is pressed inward by the split ring 14. For this reason, as shown by the two-dot chain line in FIG. 4A, the inner peripheral surface of the resin pipe 11 presses the distal end of each seal ring 33, and the outer peripheral surface of the inner cylindrical portion 25 and the resin pipe 11 The space is sealed.

When a high-pressure liquid having a pressure of, for example, 2.5 MPa flows through the joint 12, the liquid is supplied from the space between the second tapered surface 26 of the inner cylindrical portion 25 and the inner peripheral surface of the resin pipe 11. Flow into 32. For this reason, liquid accumulates in the gap between the seal ring 33 on the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11. Due to the pressure of the accumulated liquid, the seal ring 33 on the resin pipe insertion end side presses the resin pipe 11, and the adhesion between the seal ring 33 on the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11 increases. For this reason,
The liquid can be prevented from flowing out between the seal ring 33 on the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11.

Even if the liquid flows out between the seal ring 33 on the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11, this liquid will flow through the second seal ring 33 from the resin pipe insertion end side. And accumulates in the gap between the resin pipe 11 and the inner peripheral surface. Due to the pressure of the accumulated liquid, the second seal ring 33 from the insertion end side of the resin pipe inserts the resin pipe 1
1, the adhesion between the second seal ring 33 from the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11 is increased. Therefore, it is possible to prevent the liquid from flowing out between the second seal ring 33 from the resin pipe insertion end side and the inner peripheral surface of the resin pipe 11.

As described above, each of the seal rings 33
Since the adhesion between the seal ring 33 and the inner peripheral surface of the resin pipe 11 is increased by the pressure of the liquid flowing into the housing groove 32, the liquid flows out between the seal ring 33 and the inner peripheral surface of the resin pipe 11. Can be prevented.

According to the first embodiment described in detail above, the following effects are exhibited. In the joint 12 of the first embodiment, the accommodation groove 32
Are fitted with four seal rings 33. For this reason, when the high-pressure liquid flows through the joint 12, the adhesion between each seal ring 33 and the inner peripheral surface of the resin pipe 11 is increased by the pressure of the liquid flowing into the housing groove 32, and the liquid is Flowing out between the seal ring 33 and the inner peripheral surface of the resin pipe 11 can be prevented.

In the joint 12 of the first embodiment, the thickness of the seal ring 33 is the same as the depth of the accommodation groove 32. For this reason, the end face 31 of the resin pipe 11 does not come into contact with the distal end 34 of the seal ring 33, and the end of the resin pipe 11 is easily fitted into the inner cylinder 25.

In the joint 12 of the first embodiment, a first tapered surface 24 whose diameter increases toward the end is formed on the inner peripheral surface of the resin pipe insertion end 21 of the joint main body 13. The outer peripheral surface of the split ring 14 is a third tapered surface 41 so as to correspond to the first tapered surface 24 of the joint body 13. For this reason, the push ring 16 is connected to the joint body 1.
The diameter of the split ring 14 can be easily reduced simply by tightening the ring 3.

In the joint 12 of the first embodiment, when the pressing ring 16 is fastened to the joint body 13, the resin pipe 11 is held by the split ring 14 while
9 is pushed. Therefore, the end face 31 of the resin pipe 11 does not come into contact with the joint body 13, and the resin pipe 11 is prevented from falling into the joint body 13 without resisting the tightening of the push ring 16. Also, the resin pipe 11
Is pressed to fit the diameter of the reduced diameter portion 29 when pushed into the reduced diameter portion 29, so that the resin pipe 11
And the inner wall of the reduced diameter portion 29 can be sealed.

In the joint 12 of the first embodiment, an O-ring 30 is fitted to the reduced diameter portion 29. For this reason, when tightening the push ring 16 to the joint main body 13,
Since the end face 31 of the resin pipe 11 is pressed against the O-ring 30, the inner end wall of the reduced diameter portion 29 and the end face 31 of the resin pipe 11 are
Is sealed.

In the joint 12 of the first embodiment, a through hole 20 is formed in the first engagement portion 19 for visually checking the insertion depth of the resin pipe 11 into the joint body 13. For this reason, the illusion of the worker is prevented, and the resin pipe 1
1 can be reliably inserted into the joint body 13 at a predetermined insertion depth.

In the joint 12 of the first embodiment, the washer 15 is interposed between the split ring 14 and the locking surface 38 of the push ring 16. For this reason, when the push ring 16 is fastened to the joint body 13, the split ring 14 is turned by the turn of the push ring 16, and the twisting of the resin pipe 11 due to the turn of the split ring 14 can be prevented. (Second Embodiment) Next, a second embodiment of the present invention will be described in detail with reference to FIG. The description of the second embodiment will focus on the differences from the first embodiment.

In the joint 12 of the second embodiment, a fourth tapered surface 42 whose diameter increases toward the inner end is formed on the inner end surface of the insertion hole 37 of the push ring 16. Also,
The outer peripheral surface of the split ring 14 is the fourth tapered surface 4 of the press ring 16.
Fifth tapered surface 43 whose diameter increases toward the inner end to correspond to 2.
It has become. The washer 15 is interposed between the split ring 14 and the distal end surface of the joint body 13.

Now, when using this joint 12,
First, a washer 15 is inserted into the resin pipe insertion end 21 of the joint body 13.
After disposing the split ring 14, the push ring 16 is loosely screwed. Then, the end of the resin pipe 11 is inserted into the insertion hole 37.
Then, the resin pipe 11 is inserted into the inner cylindrical portion 25 while being inserted into the insertion space 27 in the joint main body 13.

Next, using a tool such as a spanner, press wheel 1
6 is tightened to the joint body 13, the fifth tapered surface 43 of the split ring 14 is engaged with the fourth tapered surface 42 of the push ring 16,
The split ring 14 is reduced in diameter. Thereby, the split ring 14
The inner peripheral surface is pressed against and engaged with the outer peripheral surface of the resin pipe 11.

Therefore, in the joint 12 of the second embodiment, as in the case of the first embodiment described above, just by tightening the push ring 16 to the joint body 13, the resin pipe 1
1 is firmly retained in the joint body 13.

The above embodiment can be modified as follows. As shown in FIG. 7, the seal ring 33 is provided with a plurality of engaging protrusions 44 having a semicircular cross-section, and the tip 45 of each engaging protrusion 44 is formed on the outer periphery of the inner cylindrical portion 25. The seal ring 46 may be replaced with a seal ring 46 having a substantially rectangular cross section and configured to restrict the protrusion from the surface. Even in the case of such a configuration, when the high-pressure liquid flows through the joint 12, each of the engagement protrusions 44 of the seal ring 46 and the resin pipe 1
Since the adhesion of the liquid to the inner peripheral surface of the resin pipe 11 is increased by the pressure of the liquid flowing into the housing groove 32, the liquid is prevented from flowing out between the seal ring 46 and the inner peripheral surface of the resin pipe 11. Can be.

The split ring 14 has a substantially C-shape made of a metal such as an alloy (brass, bronze, etc.), and has insertion holes formed at both ends. Bolts are inserted into the insertion holes. A C-ring in which a nut is screwed to the tip of the bolt may be used. In the case of such a configuration, after fitting the end of the resin pipe 11 to the C-ring, the resin pipe 1
1 is inserted into the inner cylindrical portion 25. Next, by tightening the nut, the resin pipe 11 is firmly prevented from falling into the joint body 13.

The split ring 14 has a substantially C-shape made of a metal such as an alloy (brass, bronze, etc.), and has insertion holes formed at both ends, and rivets are inserted through the insertion holes.
You may change to a ring. With this configuration, C
After the end of the resin pipe 11 is inserted into the ring, the resin pipe 11 is inserted into the inner cylinder 25. Next, the rivet of the C-ring is swaged to form the resin pipe 11.
Is firmly prevented from coming off inside the joint body 13. Alternatively, the rivets may be omitted, and the C-ring may be simply crimped.

Next, the technical ideas that can be grasped from the above embodiment will be described below. 3. The joint according to claim 1, wherein the seal member includes a plurality of seal rings. 4. According to this configuration, when the high-pressure liquid flows through the joint, the adhesiveness between each seal ring and the inner peripheral surface of the resin pipe increases, so that the liquid flows between the seal ring and the inner peripheral surface of the resin pipe. It can be prevented from flowing out through the space.

The joint according to claim 1 or 2, wherein the seal member comprises two to five seal rings. According to this configuration, it is possible to manufacture a joint that can prevent leakage of the liquid even when the pressure of the liquid as the transport fluid is high, with a minimum number of parts,
Manufacturing costs can be saved.

The seal member is constituted by a single seal ring having a plurality of engaging projections.
Or the joint according to claim 2. According to this configuration, the number of parts is small, manufacturing is easy, and manufacturing costs can be further reduced.

[0050]

Since the present invention is configured as described above, it has the following effects. According to the joint according to the first aspect of the invention, the end of the resin pipe can be smoothly inserted into the inner cylindrical portion without causing any trouble such as damage to the seal member, and the liquid as the transport fluid can be smoothly inserted. Even when the pressure is high, leakage of the liquid can be prevented.

According to the joint of the second aspect of the invention, in addition to the effect of the first aspect of the invention, the resin pipe is formed by merely screwing the push ring to the resin pipe insertion end in the joint body. It is securely retained in the joint body.

[Brief description of the drawings]

FIG. 1 is a semi-longitudinal sectional view showing a state after a push ring is fastened to a joint body in a first embodiment.

FIG. 2 is a plan view showing a state before a pipe is inserted into a joint main body.

FIG. 3 is a semi-longitudinal sectional view showing a state before the push ring is fastened to the joint body.

FIG. 4A is a sectional view of a main part showing a seal member according to the first embodiment. (B) is a principal part sectional view showing a seal member considered to solve the problem in the conventional embodiment.

FIG. 5 is an exploded perspective view showing the joint of the first embodiment.

FIG. 6 is a semi-longitudinal sectional view showing a state after a push ring is fastened to a joint main body in the second embodiment.

FIG. 7 is a sectional view of a principal part showing another example of a seal member.

[Explanation of symbols]

11 ... resin pipe, 12 ... joint, 13 ... joint body, 14
... Split ring as retaining member, 16 ... Pressing ring, 21
... the insertion end of the resin pipe, 24 ... the first tapered surface as a tapered surface, 25 ... the inner cylindrical portion, 32 ... the accommodation groove, 33 ... the seal ring as a sealing member, 34 ... the tip, 41 ... the tapered outer peripheral surface The third tapered surface as.

Claims (2)

[Claims] 1. A joint body having a cylindrical shape into which a resin pipe can be inserted, an inner cylindrical portion protruding from the joint body and into which an end of the resin pipe is inserted, and an outer periphery of the inner cylindrical portion A sealing member fitted in the receiving groove recessed in the surface; and a tightening means for tightening the resin pipe by applying an external force to the resin pipe, wherein the sealing member is provided with a plurality of engaging projections. In addition, when the resin pipe is inserted into the inner cylinder, the distal end of the engaging projection is configured to restrict the protrusion from the outer peripheral surface of the inner cylinder, and the resin pipe is tightened by the tightening means. The joint according to claim 1, wherein when engaged, the distal end of the engaging projection is pressed against the inner peripheral surface of the resin pipe. 2. The joint means includes a tapered surface formed on the inner peripheral surface of the resin pipe insertion end of the joint body so as to increase in diameter toward the end, and a resin pipe insertion end of the joint body. A push ring screwed into the joint body and the push ring, a tapered outer peripheral surface corresponding to the tapered surface, and a resin pipe formed by screwing the push ring into the joint body. The joint according to claim 1, further comprising: an annular retaining member for retaining the resin pipe in the joint body by applying an external force to the joint.