JP2019108939A - Separation prevention structure of pipe connecting part - Google Patents

Abstract

To provide a separation prevention structure of a pipe connecting part for suppressing the leakage of fluid by maintaining a bent state between a spigot and a joint ring on one end side within a proper range while surely regulating separation movement which is equal to or larger than that at the separation of the spigot and a socket from each other.SOLUTION: A joint ring 30 having a divided structure for surrounding a fitment connecting part 20 between a spigot 1A and a socket 2A in a sealing state is externally fit over both pipe parts, separation movement prohibition means 40 for prohibiting, by abutment, a constant amount or lager of relative separation movement of the socket and the joint ring is arranged in a region in which the joint ring and the socket side relatively oppose each other, and there is arranged, at one pipe part, reinforcing fixing means 50 having a divided structure having a connecting part 52 which is fixed and connected to a pipe support part 30d on one end side in a pipe axial core direction of the joint ring which is externally fit thereto, and a withdrawal stop part 55 in which withdrawal resistance between an external peripheral face of the spigot and itself is increased accompanying the separation movement of the spigot with respect to the pipe support part on one end side of the joint ring.SELECTED DRAWING: Figure 4

Description

  According to the present invention, a joint ring of a split structure which encloses the fitting connection portion between the inlet of one pipe portion and the socket of the other pipe portion in a sealed state is covered over both the pipe portions, and the joint ring And a separation movement prevention means for preventing the contact movement of the reception hole and the joint ring from coming in contact with each other at a position opposite to each other in the axial direction of the pipe axis with the reception side of the other pipe portion. The present invention relates to a detachment preventing structure of a pipe connection portion.

  As a separation preventing structure of the above-mentioned pipe connection part, the pipe attachment structure shown in patent documents 1 exists. In this pipe mounting structure, the fitting connection portion between the insertion of one pipe portion and the socket of the other pipe portion is formed of a K-shaped mechanical joint. This mechanical joint has a seal material such as a rubber ring mounted between the outer peripheral surface of the inlet and the tapered inner peripheral surface of the socket, and is provided with a pressing portion capable of pressing the seal material in the axial direction of the tube. The flanges of the push ring and the flanges of the socket are tightened and connected with bolts and nuts. The sealing material is compressed in a watertight state by the pressing portion of the pressing ring that is attracted and fixed to the flange portion of the receiving port by this tightening connection, and the watertight state is maintained.

In addition, the joint ring of the division structure that encloses the mechanical joint that is the fitting connection in a sealed state has a cylindrical peripheral wall portion larger in diameter than the receiving port, and radially inward from both ends in the tube axis direction of the peripheral wall portion The main components are an annular side wall portion integrally extended to the pipe and a tube support portion integrally extended outward along the axial direction of the tube from the inner diameter side end portions of the side wall portions. Have.
On the inner peripheral surface of the both tube support portions of the joint ring, a seal portion is provided, to which a seal material for sealing between the outer peripheral surfaces of both tube portions is attached.

  The detachment movement preventing means forms the inner diameter of the tube support on the other end side of the joint ring on the inlet side smaller than the maximum outer diameter of the tapered portion of the inlet, and releases the insertion port and the reception port The tube support portion on the other end side of the joint ring abuts on the tapered portion of the receiving port in the direction of the tube axis to prevent further detachment movement.

  In addition, on the outer peripheral surface of the insertion hole positioned in the joint ring, a separation restricting portion of a divided structure provided with a locking member biting into the outer peripheral surface is held and fixed, and the outer diameter of the separation restricting portion The separation restricting portion, which is formed larger in diameter than the inner diameter of the pipe support portion on one end side of the joint ring and is separated from the insertion port and the reception port, is a pipe on one end side of the joint ring. It abuts on the support portion in the axial direction of the tube so as to prevent further detachment movement.

JP, 2016-138637, A

  In the pipe mounting structure shown in Patent Document 1, when the insertion and the receiving port are separated, the separation restricting portion pinched and fixed to the insertion only abuts the pipe supporting portion on one end side of the joint ring from the axial direction of the pipe It does not have the function of restricting the bending of the insert and the tube support at one end of the joint ring. Therefore, when the insertion port and the receiving port are separated, the insertion and the pipe support portion on one end side of the joint ring are largely bent, and the seal provided on the inner circumferential surface of the pipe support portion on one end side of the joint ring There is a disadvantage that the sealing performance in the circumferential direction of the part is locally degraded, and fluid leakage may occur from the site where the sealing performance is degraded.

  In view of this situation, the main object of the present invention is to bend the insertion and the tube supporting portion on one end side of the joint while surely restricting the further separating movement when the insertion and the reception are separated. It is an object of the present invention to provide a tube connection detachment preventing structure capable of maintaining the state in an appropriate range and suppressing the fluid leakage due to the local seal drop in the circumferential direction of the seal.

According to a first aspect of the present invention, there is provided a joint structure of a split structure in which the fitting connection portion between the inlet of one tube and the socket of the other tube is enclosed in a sealed state and covers both tubes. And the part which opposes in the pipe axis direction of the joint of the joint ring and the other inlet side of the pipe part in the pipe axis direction, the contact between the reception port and the joint ring which prevents relative detachment movement of more than a certain amount. A detachment preventing structure of a pipe connection portion provided with a movement preventing means,
A connection portion fixedly connected to the pipe support portion on one end side of the joint ring in the pipe axial direction of the joint ring externally supported by the one pipe portion, and a pipe support portion on the one end side of the joint ring It is in the point provided with the reinforcement fixing means of the division structure provided with the removal prevention part with which the removal prevention resistance between the outer peripheral surface of the said insertion increases with the removal movement of the said insertion.

According to the above configuration, when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection between the inlet and the socket, between the socket side of the other tube and the joint ring, By means of the separation movement preventing means provided at the parts facing each other in the direction of the tube axis, it is possible to contact and prevent the relative separation movement of the reception hole of the other tube part and the joint ring.
Further, between the inlet and the joint ring of one of the tube portions, the connecting portion of the reinforcing and fixing means of the divided structure provided at the inlet is fixedly connected to the pipe supporting portion on one end side of the joint ring. Furthermore, since the retaining portion of the reinforcing and fixing means increases the retaining resistance with the outer peripheral surface of the insertion opening as the insertion movement of the opening with respect to the pipe supporting portion on one end side of the joint ring increases, The insertion of the one tube portion and the tube support portion on one end side of the joint ring are integrally and firmly fixed and connected via the reinforcing and fixing means.
As a result, even if the inlet and the outlet are separated, the outlet movement of the inlet relative to the tube support on the other end of the joint ring and the outlet movement of the inlet relative to the tube support on the one end side of the joint are respectively It can be blocked firmly.

  Moreover, since the tube support portion on one end side of the joint ring and the retaining portion of the reinforcing and fixing means support two places spaced apart in the axial direction of the tube at the insertion portion of the tube portion, the insertion port and the receiving port When separated, it is possible to suppress bending of the insertion port and the pipe support portion on one end side of the joint ring.

  Therefore, at the time of separation between the insertion port and the receiving port, the tube support portion on one end side of the insertion port and the joint ring while surely restricting further separating movement by cooperation with the separation movement preventing means and the reinforcing and fixing means. Thus, it is possible to suppress the fluid leakage due to the local seal drop in the circumferential direction of the seal portion by maintaining the bending state thereof in an appropriate range.

  According to a second characterizing feature of the present invention, the separated movement preventing means is an inner peripheral surface side of the pipe supporting portion on the other end side of the joint ring in the pipe axial direction and an outer peripheral surface of the other pipe portion It is a point comprised from the separation prevention part which can contact with the peripheral face of the above-mentioned mouth formed in the part shifted to the center side of the tube axis direction of the above-mentioned joint ring rather than the seal part which seals between.

According to the above configuration, when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection between the inlet and the socket, the joint is formed on the inner circumferential surface side of the pipe support on the other end side of the joint ring Thus, the separation preventing portion can be in contact with the outer peripheral surface of the socket to prevent further separation movement of the both.
At this time, when the separation preventing portion of the joint ring abuts on the tapered portion of the outer peripheral surface of the receiving opening, a force is generated which pushes the divided surface of the joint ring of the divided structure. However, in the present invention, since the separation preventing portion of the joint ring is formed at a position deviated toward the center of the joint in the axial direction of the joint than the seal portion, the pushing force is small by the deviation margin. As a result, it is possible to suppress the occurrence of fluid leakage due to the decrease in the sealing performance of the seal portion due to the pushing and opening of the split surface of the joint ring.

  Furthermore, when the insertion port and the receiving port are separated and the pipe support at the other end of the joint ring and the port of the other pipe are bent, a seal provided at the pipe support at the other end Then, since the tube portion on the inlet side is supported at two points with the separation preventing portion which is biased to the center side in the tube axis direction of the joint ring, bending of both can be suppressed. As a result, the bent state of the tube on the inlet side and the tube support on the other end side of the joint ring is maintained in an appropriate range, and the fluid resulting from the local seal deterioration in the circumferential direction of the seal portion Leakage can be suppressed.

  According to a third characterizing feature of the present invention, the detachment movement preventing means opposes an abutment surface formed on the inner surface of the side wall portion on the other end side of the joint ring in the pipe axis direction, and faces opposite thereto in the pipe axis direction. And the contact surface of the joint ring and the contact surface of the contact member are formed in orthogonal planes orthogonal to the tube axis center. It is in the point being done.

  According to the above configuration, the contact formed on the inner surface of the side wall portion on the other end side of the joint ring when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion between the insertion port and the receiving port The surface and the abutting member fixed on the receiving side abut against each other in the axial direction of the pipe, and the further movement of the pipe on the receiving side and the joint ring is prevented. At this time, since the contact surface of the joint ring and the contact surface of the contact member on the receiving side are formed orthogonal to the tube axis, the contact surface of the joint ring and the contact member The contact surface with the contact surface is in a surface contact state along the orthogonal direction. As a result, the separation force can be reliably received to improve the separation prevention effect, and the push-open force of the split joint acting on the joint ring at the time of contact is reduced, and the sealability at the joint split of the joint ring It is possible to suppress the decrease.

  According to a fourth aspect of the present invention, the distance between the contact position of the separation preventing portion and the seal holding groove of the seal portion is one of the pipes on the inner circumferential surface of the pipe support portion at one end of the joint ring. Among the two partition walls of the seal holding groove of the seal that seals between the outer peripheral surface of the part, the inner partition wall is configured to be larger than the thickness dimension in the axial direction of the tube.

  According to the above configuration, the thickness dimension corresponding to the distance from the contact position of the separation preventing portion of the joint ring to the seal holding groove of the seal portion is the inward side of the seal holding groove in the pipe support portion on one end side of the joint ring Since it is larger than the thickness dimension of the section wall, the detachment preventing portion to be in contact with the outer peripheral surface of the socket can be robustly configured. In addition, it is possible to further suppress the occurrence of fluid leakage due to the decrease in the sealing performance of the seal portion due to the pushing and opening of the split surface of the joint ring.

  According to a fifth aspect of the present invention, there is provided an inner peripheral surface of the pipe support portion on the other end side of the joint ring, and a portion deviated toward the center of the joint ring in the axial direction with respect to the separation preventing portion. The point is that the elastic sealing material is provided to seal between the outer peripheral surface of the receptacle and the outer peripheral surface of the receptacle while the separation preventing portion is in contact with the outer peripheral surface of the receptacle.

  According to the above configuration, when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection between the inlet and the socket, the joint is formed on the inner circumferential surface side of the pipe support on the other end side of the joint ring The disengagement preventing portion abuts on the outer peripheral surface of the socket to prevent further detachment movement of the both. At this time, the coating protective layer such as powder coating formed on the outer peripheral surface of the socket to which the detachment preventing portion abuts is damaged, but is deviated toward the center of the joint in the tube axis direction than the detachment preventing portion. Since the elastic sealing material provided at the site seals between the outer peripheral surface of the socket, fluid does not flow into the damaged area of the coated protective layer, and the port at the damaged site of the coated protective layer It is possible to suppress the progress of corrosion.

  According to a sixth aspect of the present invention, the connecting portion of the reinforcing and fixing means is detachably attached to an engaging recess formed on the outer peripheral surface of the pipe supporting portion at one end of the joint ring from the radially outer side of the pipe It consists in the fact that it consists of an engagement lug which is possibly engaged.

  According to the above-described configuration, the engagement protrusion constituting the connection portion of the reinforcing and fixing means engages with the engagement recess formed on the outer peripheral surface of the pipe support portion on one end side of the joint ring from the outer side in the pipe radial direction Because they are combined, when the insertion port and the receiving port are separated, it is possible to suppress bending of the insertion section of one of the pipe sections and the pipe support section on one end side of the joint ring. Thereby, the bent state of the insertion of the tube portion and the tube support portion on one end side of the joint ring is maintained in an appropriate range, and the fluid leaks due to the local seal deterioration in the circumferential direction of the seal portion. Can be suppressed.

  According to a seventh characterizing feature of the present invention, the contact member is supported by a split structure capable of being held in a fixed position with respect to a bending portion extending across a tapered outer peripheral surface portion and a straight outer peripheral surface portion in an outer peripheral surface of the socket. It is in the point comprised from the ring.

  According to the above configuration, the contact formed on the inner surface of the side wall portion on the other end side of the joint ring when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion between the insertion port and the receiving port The surface and the contact surface of the holding ring held in a bent position in the outer peripheral surface of the socket abut from the axial direction of the tube. The holding ring abuts on the tapered outer peripheral surface portion of the outer peripheral surface of the socket, and can firmly receive the separation force. However, since the contact surface of the joint ring and the contact surface of the holding ring are in a surface contact state along the direction orthogonal to the tube axis, the push-open force of the split joint acting on the joint ring at the time of contact Can be reduced to suppress the reduction in sealing performance at the split joint of the joint ring.

Partial cross-sectional view in the disassembled state showing the first embodiment of the detachment preventing structure of the pipe connection portion Overall cross section at the time of assembly Enlarged sectional view of the main parts at the time of assembly Overall cross section at the time of detachment The whole sectional view at the time of assembly (a) and separation (b) showing a second embodiment of the separation prevention structure of a pipe connection part The enlarged view of the principal part which shows 3rd Embodiment of the detachment prevention structure of a connection part The whole sectional view at the time of assembly (a) and separation (b) showing a 4th embodiment of separation prevention structure of a pipe connection part Enlarged view of T-head bolt side showing two other examples (a) and (b) of the fourth embodiment The whole sectional view at the time of assembly (a) and separation (b) showing a fifth embodiment of separation prevention structure of pipe connection part The whole sectional view at the time of assembly (a) and separation (b) showing a sixth embodiment of separation prevention structure of pipe connection part Whole sectional drawing at the time of assembling | attachment which shows 7th Embodiment of the detachment prevention structure of a pipe | tube connection part The whole sectional view at the time of assembly (a) and separation (b) showing the 8th embodiment of separation prevention structure of a pipe connection part

First Embodiment
1 and 2 show a separation preventing structure of a pipe connection used in a fluid transport piping system. In the separation preventing structure of the pipe connection portion, the fitting connection portion 20 connects the insertion port 1A of the fluid pipe 1 which is an example of one pipe portion and the reception port 2A of the fluid pipe 2 which is an example of the other pipe portion. The joint ring 30 of the split structure that encloses the fitting connection portion 20 in a sealed state is packaged over both fluid pipes 1 and 2.
Further, at a position where the joint ring 30 and the inlet 2A side of the other fluid pipe 2 are opposed to each other in the axial direction of the pipe, relative detachment of the inlet 2A of the other fluid pipe 2 and the joint 30 with a certain amount or more A separation movement prevention means 40 is provided for preventing the movement from coming into abutment.

In the separation preventing structure of the above-mentioned pipe connection part, although fluid pipes 1 and 2 were mentioned as an example as a pipe part, a thing of various forms conventionally exists as a pipe part. For example, although not shown, the branched pipe portion of the split T-tube having a split structure externally fixed in a sealed state to the fluid pipe, the branched pipe portion integrally formed on the fluid pipe, and a part of fluid equipment Can be mentioned.
Furthermore, although the fluid pipes 1 and 2 of the present embodiment are ductile cast iron pipes that constitute a water pipe for transporting clean water, which is an example of a fluid, other cast iron pipes, steel pipes, and the like can be used. As the fluid, industrial water, gas, etc. can be mentioned in addition to clean water.

  As shown in FIGS. 1 to 3, the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a K-shaped mechanical joint. In this K-shaped mechanical joint, a first seal member 21 such as a rubber ring is mounted between the outer peripheral surface 1a of the insertion slot 1A and the tapered inner peripheral surface 2a of the socket 2A. A push ring 22 of a divided structure provided with a pressing portion 22a capable of pressing the first seal member 21 in the axial direction of the tube axis is covered with the insertion opening 1A. The flange portion 22b of the push ring 22 and the flange portion 2b of the receiving port 2A are tightened and connected by a T-head bolt 23 and a nut 24 in the axial direction of the pipe. By this tightening connection, the first seal member 21 is compressed in a watertight state (sealed state) by the pressing portion 22a of the push ring 22 drawn and fixed to the flange portion 2b of the receptacle 2A, and the watertight state is maintained.

  As shown in FIGS. 2 and 3, the joint ring 30 is made of cast iron of a two-divided structure which can be fitted over both fluid pipes 1 and 2 in a state of surrounding the fitting connection portion 20 of both fluid pipes 1 and 2. And the split joint case 30A, 30B. In the joint ring 30, a cylindrical peripheral wall portion 30a having a diameter larger than that of the receiving port 2A, and an annular side wall portion 30b integrally extended radially inward from both ends in the tube axial direction of the peripheral wall portion 30a. , 30c, and cylindrical tube support portions 30d, 30e integrally extended outward along the axial direction of the tube from the inner diameter side end portions of the side wall portions 30b, 30c as main components. There is.

As shown in FIG. 1, connecting flange portions 30C for fixing and connecting to each other through fastening means such as bolts 31 and nuts 32 at both end portions in the tube circumferential direction of both split joint cases 30A and 30B of the joint ring 30. Is integrally formed. Between the split surface of both split joint cases 30A and 30B, the inner circumferential surface 30f (see FIG. 2) of the splice ring 30 and the outer circumferential surfaces 1a and 2c of both fluid pipes 1 and 2 including the fitting connection portion 20. A sealing portion 35 (see FIG. 2) is provided to seal the surrounding space 33 formed in the watertight from the outside.
As shown in FIGS. 2 and 3, the seal portion 35 is a second seal member 37 such as an annular gasket or the like in an annular seal holding groove 36 formed in each of the divided surfaces of both split joint cases 30A and 30B. Wearing is configured. The two second seal members 37 contact each other in the water-tight state from the pipe radial direction at both ends of the split joint case 30A, 30B in the pipe circumferential direction, and both the tube support portions 30d, 30e of the joint ring 30 The outer peripheral surfaces 1a and 2c of the fluid pipes 1 and 2 are in watertight contact along the pipe circumferential direction.

The detachment movement preventing means 40 is, as shown in FIGS. 2 to 4, on the inner peripheral surface side of the pipe support portion 30 e on the other end side of the joint ring 30 in the pipe axial direction and inside the pipe support portion 30 e. The pipe circumferential direction seal groove portion 36a of the seal holding groove 36 formed on the circumferential surface and the pipe center direction side of the joint ring 30 offset from the pipe circumferential direction seal portion 37a of the second seal member 37 attached thereto At the above-mentioned portion, a separation preventing portion 41 provided with an annular contact surface 41a capable of coming into contact with the outer peripheral surface 2c of the receiving port 2A from the direction of the tube axis is formed.
The separation preventing portion 41 is formed smaller in diameter than the inner diameter of the partition wall 30g located on both sides in the tube axial direction of the tube circumferential sealing groove portion 36a on the inner peripheral surface of the tube support portion 30e on the other end side. In other words, the inner peripheral surface of the separation preventing portion 41 is formed so as to project radially inward of the inner peripheral surface of the partition wall 30g located on both sides of the pipe circumferential direction sealing groove portion 36a, and The portion 41 is integrally formed with one of the partition walls 30g, and has a reinforcing structure in which the thickness in the tube axis direction from the contact surface 41a of the detachment prevention portion 41 to the seal portion 35 is also large.
Further, the contact surface 41a of the detachment preventing portion 41 is formed to have the same or substantially the same tilt angle as the tapered contact portion 2d of the outer peripheral surface 2c of the receptacle 2A.

  When a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2, the other fluid pipe 2 Between the receiving port 2A and the pipe supporting portion 30e on the other end side of the joint ring 30, the contact surface 41a of the separation preventing portion 41 and the receiving port 2A provided at the portions facing each other in the axial direction of the pipe axis. The contact of the outer peripheral surface 2c with the tapered contact portion 2d prevents a predetermined or more relative detachment movement of the receiving port 2A of the other fluid pipe 2 and the pipe support portion 30e on the other end side of the joint ring 30 from contact. can do.

Therefore, in the present embodiment, as shown in FIGS. 2 and 3, the tip of the T-head bolt 23 of the fitting connection portion 20 is in contact with the inner surface of the side wall portion 30 b at one end of the joint ring 30. It will be in the initial assembly state. Further, as shown in FIG. 4, the contact surface 41a of the separation preventing portion 41 formed on the pipe support portion 30e on the other end side of the joint ring 30 is in contact with the tapered contact portion 2d of the outer peripheral surface 2c of the socket 2A. The state of contact is the maximum separation movement state.
Thereby, as shown in FIG. 4, the tip end of T-head bolt 23 in the state of maximum detachment movement from the tip end position of T-head bolt 23 or the inner surface of side wall 30b at one end side of joint ring 30 in the initial assembled state The distance L to the position is the maximum separation movement distance, and in the maximum separation movement state, the insertion port 1A of one fluid pipe 1 and the reception port 2A of the other fluid pipe 2 are in the separation state.

  Then, as described above, the detachment force caused by the earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the insertion port 1A and the receiving port 2A, and the pipe support 30e at the other end of the joint ring 30 When the contact surface 41a of the separation preventing portion 41 formed on the inner peripheral surface side abuts on the tapered contact portion 2d of the outer peripheral surface 2c of the receptacle 2A, the force pushing the divided surface of the joint ring 30 of the divided structure Occurs. However, in the present invention, since the separation preventing portion 41 of the joint ring 30 is formed at a position deviated toward the center of the joint ring 30 in the axial direction of the pipe relative to the circumferential seal groove portion 36a of the seal portion 35, The pushing force is reduced by the deviation margin, and it is possible to suppress the occurrence of fluid leakage due to the decrease in the sealing performance (surface pressure decrease) of the seal portion 35 caused by the pushing and opening of the divided surface of the joint ring 30.

Further, as shown in FIG. 3, the circumferential circumferential seal groove of the seal holding groove 36 formed on the inner peripheral surface of the tube support portion 30e on the other end side from the contact surface 41a which is the contact position of the detachment prevention portion 41. The distance L1 to the portion 36a is the joint ring among the partition walls 30h on both sides in the tube axis direction in the tube circumferential direction seal groove portion 36a of the seal holding groove 36 formed on the inner circumferential surface of the tube support portion 30d at one end side The inner partition wall 30h on the center side in the tube axis direction of the tube 30 is configured to be larger than the thickness dimension in the tube axis direction.
As shown in FIG. 3, the thickness dimension corresponding to the distance L1 from the contact surface 41 a of the detachment preventing portion 41 of the joint ring 30 to the circumferential circumferential seal groove portion 36 a of the seal portion 35 is one end side of the joint ring 30. Since the thickness dimension of the partition wall 30h of the tube circumferential sealing groove portion 36a in the tube supporting portion 30d is larger than the thickness dimension in the tube axis direction, the separation preventing portion 41 in contact with the outer peripheral surface 2c of the receiving port 2A is It can be constructed robustly.

  Furthermore, as shown in FIGS. 1 to 4, division is an example of reinforcing and fixing means for integrally fixing and connecting one fluid pipe 1 and the pipe supporting portion 30 d on one end side of the joint ring 30 in the pipe axis direction. A seismic reinforcement 50 of the structure is provided. As shown in FIG. 1, a pair of aseismatic reinforcing metal fittings 50 are divided into two in the circumferential direction of the pipe, and are held in a removable manner in the pipe radial direction with respect to the inlet 1A of one fluid pipe 1. A divided holding member 51 made of metal is provided. The pair of split clamping members 51 are firmly clamped and fixed to the insertion port 1A of the fluid pipe 1 by fastening and connecting the flange portions 51A provided at both ends in the tube circumferential direction with bolts 48 and nuts 49. Be done.

As shown in FIGS. 2 to 4, the aseismatic reinforcing metal fitting 50 has a connecting portion 52 fixedly connected to the pipe supporting portion 30 d on one end side of the joint ring 30 and a pipe supporting portion 30 d on one end side of the joint ring 30. A detachment preventing portion 55 is provided which increases the detachment resistance between the insertion opening 1A and the outer peripheral surface 1a of the insertion opening 1A as the detachment movement of the insertion opening 1A.
The connecting portion 52 is engaged with an annular engaging recess 53 formed on the outer peripheral surface of the tube supporting portion 30 d at one end side and opened radially outward from the outer side in the tube radial direction with respect to the engaging recess 53. It comprises an engagement projection 54 which is releasably engaged. Among them, the engagement protrusions 54 are integrally formed along a tube axis direction from a plurality of locations in the tube circumferential direction of both split holding members 51.
In the case where the aseismatic reinforcing metal fitting 50 is attached to the insertion port 1A of the fluid pipe 1, as shown in FIGS. 1 and 2, the engagement projection 54 integrally formed on both split holding members 51 is supported at one end It engages with the engagement recess 53 of the portion 30d from the outer side in the pipe radial direction, and in this state, the flange portions 51A of the both divided holding members 51 are tightened and connected by the bolt 48 and the nut 49.

The retaining portion 55 is, as shown in FIGS. 1 and 2, a claw storage portion 56 formed on the inner peripheral surface of both split holding members 51 and opening in the radial direction, and the claw storage portion 56. And a claw member 57 housed movably inward in the radial direction of the pipe. On the inner surface of the claw member 57, a plurality of rows of sharp tapered blade portions along the circumferential direction of the tube which can be inserted into the outer peripheral surface 1a of the insertion opening 1A are formed.
A claw member stored in the claw storage portion 56 in a state in which the outer surface of the claw member 57 and the ceiling surface of the claw storage portion 56 penetrate into the claw storage portion 56 of both split holding members 51 and the outer peripheral surface 1a of the opening 1A. The claw member 57 is configured to be inclined to move inward in the radial direction in accordance with the relative separation movement with the pipe 57 in the axial direction.

When a detachment force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2, Between the inlet 1A and the joint ring 30, the connection portion 52 of the seismic reinforcement fitting 50 of the divided structure provided at the inlet 1A is fixedly connected to the pipe support 30d at one end side of the joint 30. Furthermore, the claw members 57 of the retaining portion 55 of the seismic reinforcement 50 are pulled out by biting into the outer peripheral surface 1a of the insertion opening 1A as the opening 1A moves away from the pipe support 30d at one end of the joint ring 30. Stop resistance increases. Therefore, as a whole, the insertion port 1A of one fluid pipe 1 and the pipe support portion 30d on one end side of the joint ring 30 are integrally and firmly fixed and connected via the aseismatic reinforcing metal fitting 50.
Thereby, as shown in FIG. 4, even if the insertion port 1A and the receiving port 2A are separated, the receiving movement of the receiving port 2A with respect to the pipe supporting portion 30e on the other end side of the joint ring 30 and one end of the joint ring 30 It is possible to firmly block the removal movement of the insertion 1A with respect to the side pipe support 30d.

  Moreover, since the pipe support portion 30d on one end side of the joint ring 30 and the retaining portion 55 of the seismic reinforcement 50 support two places spaced in the axial direction of the inlet 1A of the fluid pipe 1 as shown in FIG. As shown in 4, when the insertion port 1A and the receiving port 2A are separated, it is possible to suppress bending of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30.

Furthermore, the engagement protrusion 54 which constitutes the connection portion 52 of the seismic reinforcement 50 is radially outward of the engagement recess 53 formed on the outer peripheral surface of the pipe support 30d at one end of the joint ring 30. Therefore, when the inlet 1A and the inlet 2A are separated, the bending of the inlet 1A of the fluid pipe 1 and the tube support 30d at one end of the joint ring 30 can be suppressed. it can. Thereby, the bending state of the inlet 1A of the fluid pipe 1 and the pipe supporting portion 30d on one end side of the joint ring 30 is maintained in an appropriate range, and the local sealing performance is reduced in the circumferential direction of the sealing portion 35. It is possible to suppress the resulting fluid leakage.
Second Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 5, the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a T-shaped mechanical joint There is. This T-shaped mechanical joint is formed between the outer peripheral surface 1a of the insertion opening 1A which is fitted and connected in the radially inward opening annular seal holding groove 60 formed on the inner peripheral surface of the socket 2A. A third seal member 61 such as a rubber ring compressed in a watertight state is mounted.
The other configuration is the same as the configuration described in the first embodiment, so the same components as those in the first embodiment are indicated by the same reference numerals as in the first embodiment, and the description thereof will be omitted.

Third Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 6, the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a T-shaped mechanical joint There is. In the separation preventing structure of the pipe connection portion, an improvement of the separation movement preventing means 40 is described, in which the relative separation movement of the reception port 2A of the other fluid pipe 2 and the joint ring 30 is prevented from coming into contact with each other. Also in this embodiment, the seal holding groove 36 formed on the inner peripheral surface side of the pipe support 30e on the other end side of the joint ring 30 in the pipe axis direction and on the inner peripheral surface of the pipe support 30e. The outer circumferential surface 2c of the inlet 2A is located at a position shifted to the center of the joint ring 30 in the axial direction of the joint ring 30 with respect to the circumferential seal groove portion 36a and the circumferential seal portion 37a of the second seal member 37 attached thereto. A separation preventing portion 41 having a tapered contact portion 2d and an annular contact surface 41a that can contact in the direction of the tube axis is formed.

On the inner peripheral surface of the tube support portion 30 e on the other end side of the joint ring 30 and at a position deviated toward the center of the joint ring 30 in the axial direction of the joint ring 30 with respect to the detachment prevention portion 41, An annular elastic sealing material 43 is provided to seal between the contact surface 41a and the outer peripheral surface 2c of the outlet 2A in a state where the contact surface 41a is in contact with the tapered contact portion 2d of the outer peripheral surface 2c of the outlet 2A.
The contact surface 41a of the separation preventing portion 41 and the second seal holding groove 44 for holding the elastic seal member 43 are formed on the inner peripheral surface of the side wall 30c at the other end of the joint ring 30, and the other side The thickness of the side wall portion 30b at one end side of the joint ring 30 is larger than the thickness in the direction of the center axis of the pipe ring 30c (see FIG. 2 of the first embodiment and FIG. 5 of the second embodiment). It is done.

When a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the inlet 2A of the other fluid pipe 2, the other end side of the joint ring 30 The abutment surface 41a of the detachment preventing portion 41 formed on the inner circumferential surface side of the tube support portion 30e abuts on the tapered abutment portion 2d of the outer circumferential surface 2c of the receiving port 2A, and the further detachment of both It is blocked. At this time, the coating protective layer such as powder coating formed on the outer peripheral surface 2c of the socket 2A with which the contact surface 41a of the detachment preventing portion 41 abuts is damaged. Also, since the elastic seal member 43 provided at the position deviated to the center side in the tube axial direction of the joint ring 30 seals the gap between the joint ring 30 and the outer peripheral surface 2c of the inlet 2A, Can be prevented from flowing, and the progress of corrosion of the inlet 2A at the damaged portion of the coating protective layer can be suppressed.
The other configuration is the same as the configuration described in the second embodiment, so the same components as those in the first embodiment are indicated by the same reference numerals and the description thereof will be omitted.

Fourth Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 7, the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a K-shaped mechanical joint . In the separation preventing structure of the pipe connection portion, an improvement of the separation movement preventing means 40 is described, in which the relative separation movement of the reception port 2A of the other fluid pipe 2 and the joint ring 30 is prevented from coming into contact with each other.
The detachment movement preventing means 40 of this embodiment is a plurality of metal T-head bolts arranged at predetermined intervals in the pipe circumferential direction among the constituent members of the K-shaped mechanical joint constituting the fitting connection portion 20. 23 is combined with the contact member 45 fixed to the receiving port 2A side, and the flat top surface 23a of the head 23A of each T-head bolt 23 is formed as the contact surface 45a of the contact member 45 There is.

Further, of the inner surfaces of the side wall portion 30c on the other end side of the joint ring 30 in the tube axis direction, the inner surface portion facing the head 23A of each T-head bolt 23 in the tube axis direction is configured as the contact surface 46 ing.
The contact surface 46 formed on the inner surface of the side wall portion 30c and the contact surface 45a of the contact member 45 configured by the top surface 23a of the head 23A of each T-head bolt 23 are each a tube axis core. They are formed in orthogonal planes orthogonal to each other.

When a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the inlet 2A of the other fluid pipe 2, the other end side of the joint ring 30 The contact surface 45a of the contact member 45 configured by the contact surface 46 formed on the inner surface of the side wall 30c and the contact surface 45a of the head 23A of each T-head bolt 23 fixed on the receiving port 2A side And abut against the surface in the axial direction of the tube axis, and the separate movement of the inlet 2A of the fluid tube 2 and the joint ring 30 is prevented. The surface contact between the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45 configured with the contact surface 45a of each T-head bolt 23 reliably receives the separation force, thereby preventing the separation. Can be improved.
The other configuration is the same as the configuration described in the first embodiment, so the same components as those in the first embodiment are indicated by the same reference numerals as in the first embodiment, and the description thereof will be omitted.

In the fourth embodiment described above, the flat top surface 23a of the head portion 23A of each T-head bolt 23 is configured as the contact surface 45a of the contact member 45, but as shown in FIG. In the head 23A of each T-head bolt 23, a contact member 45 including a contact surface 46 of the side wall 30c of the joint ring 30 and a contact surface 45a that can contact in the axial direction of the tube is integrally formed. You may
Also in this case, the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45 of each T-head bolt 23 on the socket 2A side are formed in an orthogonal plane orthogonal to the tube axis. . As a result, the abutment surface 46 of the joint ring 30 and the abutment surface 45a of the abutment member 45 of each T-head bolt 23 come into surface contact, and the detachment force can be reliably received to improve the detachment prevention effect.

Furthermore, as shown in FIG. 8 (b), the contact surface 46 of the side wall 30c of the joint ring 30 and the contact surface 45a that can contact in the axial direction of the tube are attached to the head 23A of each T-head bolt 23 The provided contact member 45 may be fitted and fixed as an attachment.
Also in this case, the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45B of each T-head bolt 23 on the socket 2A side are formed in an orthogonal plane orthogonal to the tube axis. . As a result, the abutment surface 46 of the joint ring 30 and the abutment surface 45a of the abutment member 45B of each T-head bolt 23 come into surface contact, and the detachment force can be reliably received to improve the detachment prevention effect.

Fifth Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 9, the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a T-shaped mechanical joint . In the separation preventing structure of the pipe connection portion, an improvement of the separation movement preventing means 40 is described, in which the relative separation movement of the reception port 2A of the other fluid pipe 2 and the joint ring 30 is prevented from coming into contact with each other.
In the separated movement preventing means 40 of this embodiment, it is an example of the contact member 45 fixed to the receiving port 2A side of the other fluid pipe 2, and is gripped from the outside in the pipe radial direction with respect to the receiving port 2A of the fluid pipe 2. A metal contact band 70 of a divided structure (two divided structures in this embodiment) to be fixed is used. The contact band 70 is provided with an annular first positioning portion 70b to be in contact with the end face on the connection port side of the socket 2A, and a second positioning portion 70c to be in contact with a tapered portion of the outer peripheral surface 2c of the socket 2A. It is done. Therefore, in a state where the contact band 70 is tightened and fixed to the outer peripheral surface of the receiving port 2A, the movement of the contact band 70 in the axial direction of the contact band is blocked by the first positioning portion 70b and the second positioning portion 70c. .

  The tip end surface 70a of the second positioning portion 70c of the contact band 70 is formed on the contact surface 45a of the contact member 45, and the inner surface of the side wall 30c on the other side of the joint 30 in the tube axis direction An inner surface portion opposite to the contact surface 45 a configured with the tip end surface 70 a of the second positioning portion 45 c of the contact band 70 in the axial direction of the tube axis is configured as the contact surface 46.

Also in this case, the contact surface 46 of the joint ring 30 and the contact surface 45a constituted by the tip surface 70a of the contact band 70 fixed to the socket 2A are orthogonal surfaces orthogonal to the tube axis. It is formed. As a result, the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact band 70 come into surface contact, and the detachment force can be reliably received to improve the detachment prevention effect.
The other configuration is the same as the configuration described in the first embodiment, so the same components as those in the second embodiment are indicated by the same reference numerals and the description thereof will be omitted.

Sixth Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 10, the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a K-shaped mechanical joint . In the separation preventing structure of the pipe connection portion, an improvement of the separation movement preventing means 40 is described, in which the relative separation movement of the reception port 2A of the other fluid pipe 2 and the joint ring 30 is prevented from coming into contact with each other.
The separated movement preventing means 40 of this embodiment is an example of the contact member 45 fixed to the receiving port 2A side of the other fluid pipe 2, and engaged with the flange portion 2b of the receiving port 2A from the outside in the pipe radial direction. A metal receiving band 71 which is held and fixed in a combined state is used. The front end surface 71a of the reception band 71 is formed on the contact surface 45a of the contact member 45, and the front end of the reception band 71 among the inner surfaces of the side wall portion 30c on the other end side of the joint 30 in the tube axis direction. An inner surface portion opposite to the contact surface 45 a configured with the surface 71 a in the axial direction of the tube axis is formed as the contact surface 46.

Also in this case, each of the contact surfaces 45a configured by the contact surface 46 of the joint ring 30 and the end surface 71a of the receiving band 71 fixed to the receiving opening 2A is an orthogonal surface orthogonal to the tube axis. Is formed. Thereby, the contact surface 46 of the joint ring 30 and the contact surface 45a of the receiving band 71 come into surface contact, and the detachment force can be reliably received to improve the detachment prevention effect.
The other configuration is the same as the configuration described in the first embodiment, so the same components as those in the first embodiment are indicated by the same reference numerals as in the first embodiment, and the description thereof will be omitted.

Seventh Embodiment
In the detachment preventing structure of the pipe connection portion shown in FIG. 11, the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a K-shaped mechanical joint . In this separation preventing structure of the pipe connection portion, a seismic reinforcement metal fitting (reinforcing fixing means) of a divided structure in which one fluid pipe 1 and the pipe supporting portion 30d on one end side of the joint ring 30 in the pipe axis direction are integrally fixed and connected. One example) 50 improvements are shown.
In the aseismatic reinforcing metal fitting 50 of this embodiment, the pipe circumferential sealing groove portion 36 a of the seal holding groove 36 formed on the inner peripheral surface of the pipe supporting portion 30 d on one end side of the joint ring 30 in the pipe axial direction. And an extended tube supporting portion provided with an annular space opening radially inward on an end side of the second seal member 37 mounted thereto and located on the side of the seismic reinforcement bracket 50 with respect to the tube circumferential sealing portion 37a. 30j is integrally formed.

  An annular engagement recess 53 opened radially outward is formed on the outer peripheral surface of the tube support 30 d on one end side including the extension tube support 30 j, and the extension tube support in the engagement recess 53. Engaging projections 54 integrally formed on the both divided holding members 51 of the seismic reinforcement 50 are engaged from the outside in the radial direction of the pipe in a range corresponding to 30j.

  In the case of this embodiment, the seal holding groove 36 formed on the inner peripheral surface of the pipe support 30d is the engagement position by the engagement protrusion 54 of the seismic reinforcement 50 with the pipe support 30d on one end side of the joint ring 30. The tube circumferential sealing groove portion 36a is separated from the tube circumferential sealing portion 37a of the second seal member 37 attached thereto to the outer end side. Therefore, as shown in FIG. 4, when the insertion port 1A and the receiving port 2A are separated, it is possible to suppress bending of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30. Thus, the bending state of the inlet 1A of the fluid pipe 1 and the pipe support 30d on one end side of the joint ring 30 is maintained in an appropriate range, and the circumferential direction of the pipe circumferential seal groove portion 36a of the seal 35 It is possible to suppress the fluid leakage due to the local sealing deterioration of the

Eighth Embodiment
In the separation preventing structure of the pipe connection portion shown in FIG. 12, the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 is formed of a K-shaped mechanical joint . In the separation preventing structure of the pipe connection portion, an improvement of the separation movement preventing means 40 is described, in which the relative separation movement of the reception port 2A of the other fluid pipe 2 and the joint ring 30 is prevented from coming into contact with each other.
In the separated movement preventing means 40 of this embodiment, an example of the contact member 45 fixed to the receiving port 2A side of the other fluid pipe 2 is a straight shape with the tapered outer peripheral surface portion 2e in the outer peripheral surface 2c of the receiving port 2A. A metal holding ring 80 of a divided structure (in this embodiment, a two-part divided structure) is used which can be held in a removable manner from the outside in the radial direction of the tube with respect to the bending portion extending to the outer peripheral surface portion 2f. The holding ring 80 is provided with a semicircular dividing ring 80A which is divided into two in the pipe circumferential direction. The pair of split rings 80A is firmly held and fixed at the bent portion of the receiving port 2A by fastening and connecting the connecting pieces 80B provided at both ends in the tube circumferential direction with bolts 81.
One end face 80a of the pinch ring 80 in the tube axis direction is formed as a tapered end face that abuts against the tapered outer peripheral surface portion 2e of the outer peripheral surface 2c of the socket 2A. The other end surface 80b of the support ring 80 in the tube axis direction includes the other end surface of the dividing ring 80A in the tube axis direction and the other end surface of the connecting piece 80B in the tube axis direction, and the contact surface of the contact member 45 It is composed of 45a. The inner surface of the side wall portion 30c on the other end side of the joint ring 30 in the pipe axis direction is an abutting surface 46 that can abut on the abutting surface 45a configured with the other end face 80b of the clamping ring 80 in the pipe axial direction. Is configured. An abutment surface 46 configured with the inner surface of the side wall portion 30c of the joint ring 30 and an abutment surface 45a configured with the other end surface 80b of the clamping ring 80 are formed in orthogonal planes orthogonal to the tube axis. ing.

Then, when a separation force caused by an earthquake, uneven settlement, or the like acts on the fitting connection portion 20 between the inlet 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2, the other end of the joint ring 30 The contact surface 46 formed on the inner surface of the side wall portion 30c of the side contacts the contact surface 45a of the clamping ring 80 clamped and fixed to the bent portion in the outer peripheral surface 2c of the receptacle 2A from the tube axis direction. The tapered end surface 80a of the pinching ring 80 abuts against the tapered outer peripheral surface portion 2e of the outer peripheral surface 2c of the socket 2A from the axial direction of the tube in a surface contact state, and can firmly receive the separation force. Since the contact surface 46 of the joint ring 30 and the contact surface 45a of the holding ring 80 are in surface contact along the direction perpendicular to the axial center of the pipe, the split joint acting on the joint ring 30 at the time of contact By reducing the push-open force, it is possible to suppress the decrease in the sealing performance (the decrease in the surface pressure of the second seal member 37) at the split joint portion of the joint ring 30.
The other configuration is the same as the configuration described in the first embodiment, so the same components as those in the first embodiment are indicated by the same reference numerals as in the first embodiment, and the description thereof will be omitted.

Other Embodiments
(1) In the first embodiment described above, as shown in FIG. 3, the tip end of the T-head bolt 23 of the K-shaped mechanical joint is brought into contact with or close to the inner surface of the side wall 30 b on one end side of the joint ring 30. In the initial state of assembly, the contact surface 41a of the detachment preventing portion 41 of the joint ring 30 forms an expansion / contraction margin with the tapered contact portion 2d of the outer peripheral surface 2c of the socket 2A. It may be reduced or reduced.

  (2) In the first embodiment described above, the contact surface 41a of the separation preventing portion 41 formed on the inner peripheral surface side of the tube support portion 30e on the other end side of the joint ring 30 is the outer peripheral surface 2c of the socket 2A. Although it is configured to be in direct contact with the tapered contact portion 2d of the present embodiment, an elastic body may be provided on the contact surface 41a of the separation preventing portion 41.

  (3) In the first embodiment described above, the connection portion 52 of the aseismic reinforcing bracket 50 is formed in the outer peripheral surface of the tube support portion 30d at one end side and is an annular engagement recess 53 opened radially outward. Although it comprised from the engagement protrusion 54 engaged engageably and disengageably from the pipe radial direction outer side with respect to the said engagement recessed part 53, it is not limited to this structure. For example, the connecting portion 52 of the aseismatic reinforcing metal fitting 50 may be constituted by a bolt and a nut for fixedly connecting the pipe supporting portion 30 d on one end side of the joint ring 30 and the two divided holding members 51.

1 One tube (fluid tube)
1A port 2 other tube (fluid tube)
2A socket 2c outer peripheral surface 2e tapered outer peripheral surface portion 2f straight outer peripheral surface portion 20 fitting connection portion 30 joint ring 30c side wall portion 30d tube support portion 30e at one end side tube support portion 35 at other end 35 seal portion 36 seal holding Groove 40 Departing movement preventing means 41 Departing preventing portion 41a Abutment surface 43 Elastic seal member 45 Abutment member 45a Abutment surface 50 Reinforcing fixing means (aseismic reinforcement fitting)
52 connecting portion 53 engaging recess 54 engaging projection 55 not-to-be-stopped portion 70 contact band (contact member)
71 Receiving band (contact member)
80 Support Ring (Abutment Member)

Claims (7)

A joint ring of a divided structure that encloses the fitting connection portion between the insertion of one pipe portion and the socket of the other pipe portion in a sealed state is covered over the both pipe portions, and the joint ring and the other side A pipe provided with separation movement prevention means for abutting against the relative separation movement between the reception port and the joint ring at a portion opposed to each other in the pipe axis direction with the reception side of the pipe section. A separation preventing structure of the connection portion,
A connection portion fixedly connected to the pipe support portion on one end side of the joint ring in the pipe axial direction of the joint ring externally supported by the one pipe portion, and a pipe support portion on the one end side of the joint ring A separation preventing structure of a pipe connection portion provided with a reinforcing fixing means of a divided structure provided with a separation preventing portion in which a removal prevention resistance with the outer peripheral surface of the insertion hole increases with the separation movement of the insertion hole. .   The separation movement preventing means is the inner peripheral surface side of the pipe supporting portion on the other end side of the joint ring in the axial direction of the pipe ring and the sealing portion which seals between the outer peripheral surface of the other pipe portion. The separation preventing structure for a pipe connection according to claim 1, comprising a separation preventing portion capable of coming into contact with the outer peripheral surface of the receiving port formed at a portion deviated to the center side in the tube axial direction of the joint ring.   The detachment movement preventing means is fixed to the receiving port side in a state of opposing to the contact surface formed on the inner surface of the side wall portion on the other end side of the joint ring in the pipe axis direction and in the pipe axis direction. The pipe according to claim 1, wherein the joint surface of the joint ring and the contact surface of the contact member are formed in orthogonal planes orthogonal to the tube axis core. Connection separation prevention structure.   The distance from the contact position of the separation preventing portion to the seal holding groove of the seal portion seals between the outer peripheral surface of one of the pipe portions on the inner peripheral surface of the pipe support portion at one end of the joint ring 3. The tube connection portion separation prevention structure according to claim 2, wherein the thickness dimension in the axial direction of the inner side partition wall of the two partition walls of the seal holding groove of the seal portion is larger than the thickness dimension in the pipe axis direction.   The separation preventing portion is provided on the inner peripheral surface of the pipe support portion on the other end side of the joint ring and at a portion deviated toward the center of the joint ring in the tube axial direction with respect to the separation preventing portion. 5. The separation preventing structure for a pipe connection according to claim 4, further comprising an elastic sealing material for sealing between the outer peripheral surface of the socket and the outer peripheral surface of the socket.   The connection portion of the reinforcing and fixing means is an engagement protrusion detachably engaged with the engagement recess formed on the outer peripheral surface of the tube support portion on one end side of the joint ring from the radially outer side of the tube The detachment prevention structure of the pipe connection according to any one of claims 1 to 5, which is configured.   4. The holding member according to claim 3, wherein said contact member is a holding ring of a divided structure capable of holding and fixing to a bending portion extending between a tapered outer peripheral surface portion and a straight outer peripheral surface portion in an outer peripheral surface of said socket. Anti-disengagement structure of the pipe connection part.

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