JP4148749B2 - Pipe joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe joint structure.
[0002]
[Prior art]
As a joint structure of a pipe having an expansion / contraction function and a detachment preventing function, that is, a seismic resistance function, a structure as shown in FIG. 7 is known.
[0003]
The seismic joint 1 shown in FIG. 7 is configured by inserting an insertion port 5 in the other tube 4 into a receiving port 3 in one tube 2. A seal material pressure contact surface 6 and a lock ring receiving groove 7 are formed on the inner surface of the receiving port 3 from the opening side of the receiving port 3 toward the inner side of the tube axis direction receiving port. In a state where the lock ring 8 divided by 10% in the circumferential direction is accommodated, the insertion port 5 has the insertion projection 9 formed on the outer periphery of the tip thereof passing through the inside of the lock ring 8 and the back side of the receiving port 3. Is inserted until it reaches.
[0004]
A resin backup ring 10, a rubber seal material 11, a split ring 12 that can come into contact with the seal material 11, and a press ring 13 that can press the split ring 12 are arranged in advance on the outer periphery of the insertion slot 5. The sealing material 11 is brought into contact with the sealing material pressure contact surface 6, and a plurality of bolts 14 a implanted in the end face of the receiving port 3 are passed through a plurality of round holes 13 a formed in the presser wheel 13, and then nuts are passed through the bolts 14 a. 14 b is screwed and tightened to push and move the pusher wheel 13 and the split wheel 12 toward the inner side of the receiving port 3, and the sealing material 11 is moved between the sealing material pressure contact surface 6 and the outer periphery of the insertion port 5. Compress. Thus, the receiving port 3 and the insertion port 5 are joined to each other in a state where the seal function is imparted to the joint portion.
[0005]
When a large tensile force due to an earthquake or the like acts on the earthquake-resistant joint 1 configured as described above, the insertion port 5 is inserted from the back side of the receiving port 3 as indicated by a virtual line in the figure, As shown by the solid line, the expansion / contraction function can be exhibited until the insertion protrusion 9 is engaged with the lock ring 8, that is, by slipping out of the reception opening 3 by a predetermined range. The insertion preventing projection 9 can exert a separation preventing function by engaging with the lock ring 8 from the back side of the receiving port 3.
[0006]
By the way, in the seismic joint 1 as described above, the tensile force R for pulling out the insertion port 5 from the receiving port 3 is inserted into the lock ring 8 when a tensile force is applied to the joint part as shown in FIG. A detachment prevention force F acting from the mouth projection 9 and trying to prevent the insertion opening 5 from coming out of the receptacle 3 acts from the side of the lock ring housing groove 7 on the receptacle opening side.
[0007]
At this time, since the lines of action of the separation preventing force F and the tensile force R do not exist on the same straight line, the lock ring 8 generates a rotational force T in the clockwise direction as shown in the figure. When the tensile force acting on 1 is very large, as shown by the phantom line in the figure, the lock ring 8 divided by 10% in the circumferential direction is formed between the side surface on the back side of the receiving port and the outer periphery of the insertion port. The contact may be lifted from the outer periphery of the insertion slot 5 while being elastically deformed around the rotation center 15. As described above, when the lock ring 8 is lifted from the outer periphery of the insertion slot 5, there is a risk that a sound detachment preventing function cannot be exhibited.
[0008]
On the other hand, conventionally, as shown in FIG. 9, the cross-sectional shape of the lock ring 8 is such that the side in contact with the outer periphery of the insertion slot 5 is a long side, and the opening side and the back side of the opening in the lock ring 8. Are formed in an isosceles trapezoidal shape having a taper surface 8a and a taper surface 8b on the side surfaces thereof, so that the lock ring 8 is prevented from floating from the outer periphery of the insertion slot 5.
[0009]
That is, the acting line 17 of the component force F1 in the direction perpendicular to the taper surface 8a in the tube-axis detachment preventing force F acting on the lock ring 8 from the lock ring housing groove 7 is as shown in FIG. For example, when passing through the rear side of the receiving opening from the rotation center 15 by a distance d, the locking ring 8 has a rotational force T = F1 · d that tries to lift the locking ring 8 from the outer periphery of the insertion opening 5. Act. Therefore, in order to prevent this, as shown in FIG. 9, the long side of the lock ring 8 that contacts the outer periphery of the insertion slot 5 is formed long, and the action line 17 of the component force F1 is received from the rotation center 15 of the lock ring. A lock ring 8 is formed so as to pass through the mouth opening side. (For example, refer to Patent Document 1) Note that the component force F2 in the direction along the tapered surface 8a of the separation preventing force F at this time does not significantly affect the lifting of the lock ring 8 from the outer periphery of the insertion port 5. .
[0010]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-5361 (page 2-3, FIG. 1)
[0011]
[Problems to be solved by the invention]
However, the lock ring 8 having an isosceles trapezoidal cross section as shown in FIGS. 9 and 11 is obtained from the ring-shaped member 16 having a rectangular cross section as shown by an imaginary line in FIG. However, as shown in FIG. 11, the member 16 must be machined to remove the unnecessary portions 16c and 16c, and the tapered surface 8a and the tapered surface 8b should be formed from the outer surface 16a side to the inner surface 16b side of the member 16. However, this processing took time and effort.
[0012]
Therefore, the present invention solves such problems and can reliably prevent the lock ring from floating from the outer periphery of the insertion slot when a tensile force is applied to the joint, and is applied to the lock ring. It is an object of the present invention to provide a pipe joint structure that requires less machining.
[0013]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a lock ring is accommodated in a lock ring accommodating groove formed on an inner surface of a receiving port of one tube, and the other tube inserted into the receiving port is inserted. An outer peripheral protrusion formed on the outer periphery of the tip of the mouth is configured to be able to engage with the back side of the receiving port in the lock ring, and a receiving port opening side of the lock ring can be engaged with the lock ring receiving groove. In the pipe joint structure capable of preventing the insertion port from being detached from the receiving port, the receiving port opening side portion and the receiving port back side portion of the lock ring are the outer periphery of the inserting port. At least one of a portion that contacts the lock ring receiving groove in the lock ring and a portion that contacts the lock ring in the lock ring receiving groove A taper surface that is tapered toward the opening side of the receiving port is formed on the side, and a disengagement preventing force in the tube axis direction that prevents the insertion port from being detached from the receiving port is accommodated in the lock ring. When transmitted from the groove through the tapered surface to the lock ring, the acting line of the component force in the direction perpendicular to the taper surface of the separation preventing force is inserted into the insertion port back side portion and the insertion in the lock ring. It passes through the opening side of the receiving port rather than the contact point with the outer periphery of the mouth.
[0014]
According to such a configuration, the action line of the component force in the direction perpendicular to the taper surface in the tube shaft direction detachment preventing force acting on the lock ring is such that the receiving port back side portion in the lock ring and the outer periphery of the insertion port are By passing through the opening side of the receiving port from the contact point, a rotational force in a direction in which the lock ring does not lift from the outer periphery of the insertion port can be applied to the lock ring around the contact point. Thereby, it can prevent reliably that a lock ring lifts from the outer periphery of an insertion port. In addition, the receiving opening opening side portion and receiving port back side portion of the lock ring are formed perpendicular to the outer periphery of the insertion port, and the lock ring receiving groove or the lock in the lock ring receiving groove is in contact with the lock ring receiving groove. A tapered surface that is tapered toward the opening side of the receiving port is formed in at least one of the portions that come into contact with the ring. For example, this tapered surface is formed in the lock ring receiving groove. However, it is not necessary to machine the lock ring as compared with the case where the cross section of the lock ring is formed in an isosceles trapezoidal shape. Furthermore, even when this tapered surface is formed in the lock ring, the machining applied to the lock ring can be greatly reduced compared to a lock ring having an isosceles trapezoidal cross section as described above. it can.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments 1 to 3 of the pipe joint structure of the present invention will be described. In the first to third embodiments, the same reference numerals as those used in FIGS. 7 to 11 are attached to the same parts as those already described in the conventional pipe joint structure, and detailed description thereof will be given. Is omitted. Further, in the following description, the receiving opening side refers to the left side when viewing each figure, and the receiving back side refers to the right side when viewing each figure.
(Embodiment 1)
As shown in FIG. 1, an insertion port 5 in the other tube 4 is inserted into the receiving port 3 in one tube 2, and an insertion projection that is an outer peripheral projection on the outer periphery of the distal end side of the insertion port 5. 9 is formed. A lock ring receiving groove 7 is formed on the inner surface of the receiving port 3, and a groove that is tapered toward the receiving port opening side is formed on a side surface 7 a on the receiving port opening side of the lock ring receiving groove 7. A side taper surface 7b is formed.
[0016]
The lock ring receiving groove 7 accommodates a lock ring 18 that is 10% circumferentially divided. An opening side surface 18 a that is a receiving opening side of the lock ring 18 and a back side surface 18 b that is a receiving back side. Are formed so as to be perpendicular to the outer periphery of the insertion opening 5, and the rear side surface 18 b is formed so as to be in surface contact with the end face of the insertion opening protrusion 9 on the receiving opening side. Further, a ring-side tapered surface 18c that is tapered toward the opening side of the receiving opening is formed in a portion corresponding to the groove-side tapered surface 7b of the lock ring receiving groove 7 on the opening-side side surface 18a of the lock ring 18. Has been. The groove-side tapered surface 7b and the ring-side tapered surface 18c are in surface contact. In addition, although the ring side taper surface 18d similar to the ring side taper surface 18c is formed in the reverse direction also on the back side surface 18b, this can be achieved by eliminating the front and rear restrictions on the direction of the lock ring 18. This is intended to prevent an error when the is housed in the lock ring housing groove 7.
[0017]
The lock ring 18 is obtained by machining the ring-shaped member 16 having a rectangular cross section as shown by the phantom line in FIG. 4A to remove the unnecessary portions 16c and 16c. As compared with the case where the cross section of the lock ring is formed in the shape of an isosceles trapezoid as shown in FIGS. 9 and 11, the machining that needs to be performed on the lock ring 18 can be greatly reduced.
[0018]
In the joint portion having such a structure, when a large tensile force is applied due to an earthquake or the like, the disengagement preventing force F acting on the ring side taper surface 18c of the lock ring 18 from the groove side taper surface 7b of the lock ring housing groove 7 is obtained. Is the component force F1 in the direction perpendicular to the ring-side taper surface 18c (groove-side taper surface 7b) and the ring-side taper surface at the point of application of the separation preventing force F, which is the end point on the receiving-side opening side of the ring-side taper surface 18c. It is decomposed into a component force F2 in a direction along 18c (groove side taper surface 7b).
[0019]
At this time, the acting line 17 of the component force F1 in the direction perpendicular to the ring-side tapered surface 18c (groove-side tapered surface 7b) is a contact between the back-side side surface 18b of the lock ring 18 and the outer periphery of the insertion slot 5, that is, the rotation center 15. In order to pass through the opening side of the ring, the inclination angle of the ring side taper surface 18c (groove side taper surface 7b) with respect to the tube axis direction is θ, and the groove side taper surface 7b of the ring side taper surface 18c When the length (hereinafter referred to as height) in the tube radial direction of the contacting portion is f and the height from the outer periphery of the insertion port 5 of the lock ring 18 is h, the width m of the lock ring 18 is
m> (h−f) tan θ (A)
The lock ring 18 is formed so as to satisfy the above.
[0020]
Thus, by forming the width m of the lock ring 18, the height f of the ring-side tapered surface 18 c itself, and the height h of the lock ring 18 to dimensions that satisfy the above inequality (A), The action line 17 can reliably pass through the receiving opening side of the rotation center 15 in the lock ring 18.
[0021]
Thus, for example, as shown in FIG. 5, if the acting line 17 of the component force F1 passing through the receiving opening side of the rotation center 15 is separated from the rotation center 15 of the lock ring 18 by a distance d, the lock In the ring 18, the rotational force T = F 1 · d in the direction in which the lock ring 18 does not float from the outer periphery of the insertion slot 5, that is, the direction in which the lock ring 18 is pressed against the outer periphery of the insertion slot 5 is based on the rotation center 15. Acts as
[0022]
Therefore, when the groove-side tapered surface 7b is formed on the side surface 7a on the receiving opening side of the lock ring housing groove 7 and the ring-side tapered surface 18c is also formed on the opening-side side surface 18a of the lock ring 18, By defining the width m of the lock ring 18, the height f of the ring-side tapered surface 18 c itself, and the height h of the lock ring 18 based on the inequality (A), the lock ring 18 can be It is possible to surely prevent the air from rising from.
(Embodiment 2)
In the pipe joint structure described in the second embodiment, a lock ring 19 having a rectangular cross section as shown in FIG. 2 is used instead of the lock ring 18 in the pipe joint structure described in the first embodiment. However, the configuration of the other parts is the same as that of the pipe joint structure described in the first embodiment. In this case, the groove-side tapered surface 7 b of the lock ring housing groove 7 can contact the lock ring 19 at a position on the outermost side in the tube radial direction of the opening-side side surface 19 a of the lock ring 19.
[0023]
By using a lock ring 19 having a rectangular cross section as shown in FIG. 2, the lock ring 19 has a cross section formed in an isosceles trapezoidal shape as shown in FIGS. 9 and 11. For example, it is not necessary to perform machining for removing unnecessary portions 16c and 16c shown in FIG.
[0024]
In the joint portion having such a structure, when a large tensile force is applied due to an earthquake or the like, the groove side taper surface 7b in the lock ring housing groove 7 to the opening side surface 19a in the lock ring 19 on the outermost radial direction side. The separation preventing force F acting on the position is decomposed into a component force F1 in a direction perpendicular to the groove-side taper surface 7b and a component force F2 in a direction along the groove-side taper surface 7b.
[0025]
At this time, in order for the line of action F1 of the component force F1 to pass through the contact opening between the back side surface 19b of the lock ring 19 and the outer periphery of the insertion slot 5, that is, the rotation center 15, the groove side When the inclination angle of the tapered surface 7b with respect to the tube axis direction is θ, and the height from the outer periphery of the insertion port 5 in the lock ring 19 is h, the width m of the lock ring 19 is
m> h · tan θ (B)
The lock ring 19 is formed to satisfy the above.
[0026]
Thus, by forming the width m of the lock ring 19 and the height h of the lock ring 19 so as to satisfy the above inequality (B), the line of action F1 of the component force F1 is the rotation center 15 of the lock ring 19. It can be made to pass through the receiving opening side more reliably.
[0027]
Thereby, similarly to the case described with reference to FIG. 5 in the first embodiment, it is possible to prevent the lock ring 19 from floating from the outer periphery of the insertion slot 5.
Therefore, when the cross section of the lock ring 19 is rectangular and the groove-side tapered surface 7b is formed on the side surface 7a on the receiving opening side of the lock ring receiving groove 7, the above inequality (B) is used. By determining the width m of the lock ring 19 and the height h of the lock ring 19, it is possible to reliably prevent the lock ring 19 from rising from the outer periphery of the insertion slot 5.
(Embodiment 3)
The pipe joint structure described in the third embodiment has a ring-side taper formed on the opening side surface 20a as shown in FIG. 3 instead of the lock ring 19 in the pipe joint structure described in the second embodiment. A lock ring 20 in which a part of the surface 20c can enter between the inner periphery 3a of the receiving port 3 and the outer periphery 5a of the insertion port 5 is used, and a groove side is formed on the side surface 7a of the lock ring receiving groove 7 on the receiving port opening side. The tapered surface is not formed, and the configuration of the other parts is the same as that of the pipe joint structure described in the second embodiment. In this case, the lock ring housing groove 7 can contact the lock ring 20 at the innermost radial position on the side surface 7a on the receiving opening side.
[0028]
The lock ring 20 is obtained by machining the ring-shaped member 16 having a rectangular cross section as shown by the phantom line in FIG. 4B to remove the unnecessary portion 16c. Compared with the case where the cross section of the lock ring is formed in the shape of an isosceles trapezoid as shown in FIG. 11, machining that needs to be performed on the lock ring 20 can be greatly reduced.
[0029]
In the joint portion having such a structure, when a large tensile force is applied due to an earthquake or the like, the ring side of the lock ring 20 from the innermost radial position on the side surface 7a of the lock ring receiving groove 7 on the opening side of the receiving port. The separation preventing force F acting on the tapered surface 20c is decomposed into a component force F1 in a direction perpendicular to the ring-side tapered surface 20c and a component force F2 in a direction along the ring-side tapered surface 20c at the position.
[0030]
At this time, the line of action F1 of the component force F1 in the direction perpendicular to the ring-side tapered surface 20c is a contact point between the back side surface 20b of the lock ring 20 and the outer periphery of the insertion slot 5, that is, the receiving opening side of the rotation center 15. In order to pass, the inclination angle of the ring side taper surface 20c with respect to the tube axis direction is θ, the inner diameter of the receiving port 3 is D1, the outer diameter of the insertion port 5 is D2, and the height of the lock ring 20 is determined from the ring side taper. When the height obtained by subtracting the height of the surface 20c itself, that is, the height from the outer periphery of the insertion opening 5 of the ring-side tapered surface 20c is defined as f, the width m of the lock ring 20 is
m> {(D1-D2) / 2} tan θ
+ [{(D1-D2) / 2} -f] cot θ (C)
The lock ring 20 is formed to satisfy the above.
[0031]
In this way, by forming the width m of the lock ring 20 and the height f of the ring-side tapered surface 20c from the outer periphery of the insertion port 5 to dimensions that satisfy the above inequality (C), the line of action of the component force F1 17 can pass through the opening side of the lock ring 20 more reliably than the rotation center 15.
[0032]
Thereby, similarly to the case described with reference to FIG. 5 in the first and second embodiments, it is possible to prevent the lock ring 20 from floating from the outer periphery of the insertion slot 5.
[0033]
Therefore, when the ring-side tapered surface 20c is formed on the opening side surface 20a of the lock ring 20 and the groove-side tapered surface is not formed on the side surface 7a on the receiving opening side of the lock ring receiving groove 7, By determining the width m of the lock ring 20 and the height f of the ring-side tapered surface 20c from the outer periphery of the insertion port 5 based on the inequality (C), it is ensured that the lock ring 20 is lifted from the outer periphery of the insertion port 5. Can be prevented.
[0034]
FIG. 6A shows the gap δ1 in the tube axis direction between the lock ring housing groove 7 and the lock ring 18 in the first embodiment, and FIG. 6B shows the lock ring in the second embodiment. A gap δ2 in the tube axis direction between the accommodation groove 7 and the lock ring 19 is shown. FIG. 6C shows a gap δ3 in the tube axis direction between the lock ring accommodation groove 7 and the lock ring 20 in the third embodiment. As shown in FIGS. 6A and 6B, the gap between the lock ring receiving groove and the lock ring is the largest in the first to third embodiments as shown in FIG. This is the case as in the first embodiment in which 7b is formed and the lock ring 18 is also formed with the ring-side tapered surface 18c. Thus, when the gap δ1 between the lock ring receiving groove 7 and the lock ring 18 is large, the bending angle of the joint when the bending moment is applied to the joint portion of the pipe becomes large. The joint structure of another embodiment is more preferable than the joint structure of the pipe of the first embodiment.
[0035]
Furthermore, when the pipe joint structure in the second embodiment as shown in FIG. 6B is compared with the pipe joint structure in the third embodiment as shown in FIG. 6C, the pipe joint structure in FIG. The height of the contact position between the lock ring receiving groove 7 and the lock ring 19 in the pipe radial direction, that is, the height s1 from the outer periphery of the insertion opening is the contact between the lock ring receiving groove 7 and the lock ring 20 in FIG. The height of the position in the pipe radial direction, that is, the height s2 from the outer periphery of the insertion opening is higher. As shown in FIG. 6B, when the contact position between the lock ring receiving groove and the lock ring is increased from the outer periphery of the insertion opening, the position of the line of action of the component force F1 is increased accordingly. As a result, the action line is shifted from the receiving opening side to the receiving port back side. If the action line is shifted from the opening side of the receiving port to the back side of the receiving port, it is necessary to increase the width of the lock ring as compared with the joint structure shown in FIG. However, conversely, as shown in FIG. 6C, when the height s2 of the contact position between the lock ring receiving groove 7 and the lock ring 20 is low, the action line of the component force F1 is received from the back side of the receiving port. As a result, the width of the lock ring 20 can be made smaller than that of the joint structure shown in FIG. Accordingly, among the pipe joint structures shown in the first to third embodiments, the pipe joint structure shown in the third embodiment is most suitable for implementation.
[0036]
In the first to third embodiments, the width of the lock ring or the like is changed so that the lock ring does not rise from the outer periphery of the insertion slot. It is also possible to prevent the lock ring from rising from the outer periphery of the insertion slot by changing the inclination angle of the groove side taper surface.
[0037]
【The invention's effect】
As described above, according to the present invention, the acting line of the component force in the direction perpendicular to the taper surface in the tube shaft direction detachment preventing force acting on the lock ring is the outer periphery of the receiving port back side portion and the insertion port in the lock ring. By passing through the opening side of the receiving port with respect to the contact point, a rotational force in a direction in which the lock ring does not lift from the outer periphery of the insertion port can be applied to the lock ring around the contact point. Thereby, it can prevent reliably that a lock ring lifts from the outer periphery of an insertion port. In addition, the receiving opening opening side portion and receiving port back side portion of the lock ring are formed perpendicular to the outer periphery of the insertion port, and the lock ring receiving groove or the lock in the lock ring receiving groove is in contact with the lock ring receiving groove. A tapered surface that is tapered toward the opening side of the receiving port is formed in at least one of the portions that come into contact with the ring. For example, this tapered surface is formed in the lock ring receiving groove. However, it is not necessary to machine the lock ring as compared with the case where the cross section of the lock ring is formed in an isosceles trapezoidal shape. Furthermore, even when this tapered surface is formed in the lock ring, the machining applied to the lock ring can be greatly reduced compared to a lock ring having an isosceles trapezoidal cross section as described above. it can.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a pipe joint structure according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a pipe joint structure according to a second embodiment of the present invention.
FIG. 3 is a cross-sectional view showing a pipe joint structure according to a third embodiment of the present invention.
FIG. 4 is a diagram showing how a lock ring according to an embodiment of the present invention is obtained by machining a member having a rectangular cross section.
FIG. 5 is a view showing a state in which a rotational force that prevents lifting from the outer periphery of the insertion slot is acting on the lock ring by the pipe joint structure of the embodiment of the present invention.
FIG. 6 is a diagram showing a gap generated between the lock ring housing groove and the lock ring in each embodiment.
FIG. 7 is a cross-sectional view showing a joint portion of a pipe having an earthquake resistance function.
FIG. 8 is a diagram showing a state in which a rotational force that lifts the lock ring from the outer periphery of the insertion slot is acting on the lock ring in the conventional pipe joint structure.
9 is a view showing a pipe joint structure for preventing the generation of the rotational force shown in FIG. 8 in the prior art.
FIG. 10 is a view showing a state in which a rotational force that lifts the lock ring from the outer periphery of the insertion slot acts on the lock ring in the conventional joint structure of a pipe.
FIG. 11 is a view showing that a member having a rectangular cross section is machined to obtain the lock ring having the shape shown in FIG. 9;
[Explanation of symbols]
2 One tube 3 Receiving port 4 The other tube 5 Insertion port 7 Lock ring receiving groove 7b Groove side taper surface 9 Insertion protrusion 15 Rotation center 17 Action line 18 Lock ring 18a Open side surface 18b Back side surface 18c Ring side taper Surface F Detachment prevention force

Claims (1)

A lock ring is housed in a lock ring housing groove formed on the inner surface of the receiving port of one tube, and an outer peripheral protrusion formed on the outer periphery of the distal end of the insertion port of the other tube inserted into the receiving port is the lock. The insertion opening is configured to be able to engage with the inner side of the receiving port in the ring and the receiving port opening side portion of the lock ring can be engaged with the lock ring receiving groove so that the insertion port is detached from the receiving port. In the joint structure of a pipe that can be prevented, the receiving port opening side portion and the receiving port back side portion of the lock ring are formed perpendicular to the outer periphery of the insertion port, and the lock ring in the lock ring At least one of the portion in contact with the receiving groove or the portion in contact with the lock ring in the lock ring receiving groove is tapered toward the opening side of the receiving port. When a taper surface is formed and a tube shaft direction detachment preventing force that prevents the insertion port from detaching from the receiving port is transmitted from the lock ring housing groove to the lock ring through the taper surface, The line of action of the component force in the direction perpendicular to the tapered surface of the detachment preventing force passes through the opening side of the receiving port rather than the contact point between the receiving port inner side and the outer periphery of the insertion port in the lock ring. Pipe joint structure characterized by

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