JP2022091914A - Desorption prevention structure of pipe connection part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a desorption prevention structure of a pipe connection part which suppresses the leakage of fluid resulting from the local lowering of the sealing performance of a seal part in a peripheral direction by properly maintaining bent states of a spigot and a pipe support part of a joint ring at one end side while surely regulating larger desorption movement at the desorption of the spigot and a socket.

SOLUTION: A joint ring 30 having a split structure for surrounding a fitment connection part 20 between a spigot 1A and a socket 2A in a sealed state is externally arranged over both pipe parts 1, 2. Desorption movement prohibition means 40 for abutment-prohibiting the constant or larger relative desorption movement of the socket and the joint ring is arranged in a region relatively opposing the joint ring and the socket side. Reinforcement fixing means 50 having a split structure having a connection part 52 which is fixedly connected to a pipe support part 30d of the joint ring at one end side in a pipe axial core direction which is externally fit to one pipe part, and a retention part 55 in which retention resistance is increased between an external peripheral face of the spigot and itself accompanied by the desorption movement of the spigot with respect to the pipe support part of the joint ring 30 at one end side is arranged at one pipe part.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

In the present invention, a joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both the pipe portions, and the joint ring is formed. A detachment movement preventing means for abutting and preventing a certain or more relative detachment movement between the receptacle and the joint ring is provided at a portion facing the other side of the pipe portion in the pipe axis direction. It relates to the detachment prevention structure of the pipe connection part.

As the above-mentioned pipe connection portion disconnection prevention structure, there is a pipe mounting structure shown in Patent Document 1. In this pipe mounting structure, the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion is composed of a K-shaped mechanical joint. This mechanical joint is provided with a sealing material such as a rubber ring mounted between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the receiving port, and has a pressing portion capable of pressing this sealing material from the direction of the tube axis. Tighten the flange of the push ring and the flange of the receiving port with bolts and nuts to connect them. By this tightening connection, the sealing material is compressed into a watertight state by the pressing part of the push ring that is pulled and fixed to the flange part of the receiving port, and the watertight state is maintained.

In addition, the joint ring with a split structure that surrounds the mechanical joint, which is the fitting connection part, in a sealed state has a cylindrical peripheral wall portion with a diameter larger than the socket and a radial inward direction from both ends of the peripheral wall portion in the pipe axis direction. The main configuration is an annular side wall that is integrally extended to the outside and a pipe support that is integrally extended outward from the inner diameter side end of each side wall along the pipe axis direction. I have.
On the inner peripheral surface of both pipe support portions of the joint ring, a seal portion equipped with a sealing material for sealing between the outer peripheral surfaces of both pipe portions is provided.

The detachment movement preventing means forms the inner diameter of the pipe support portion on the other end side of the joint ring on the receiving port side to be smaller than the maximum outer diameter of the tapered portion of the receiving port, and when the insertion port and the receiving port are separated from each other. The pipe support portion on the other end side of the joint ring abuts on the tapered portion of the receiving port from the direction of the pipe axis, and is configured to prevent further detachment movement.

Further, a detachment restricting portion having a split structure provided with a locking member that bites into the outer peripheral surface is sandwiched and fixed on the outer peripheral surface of the insertion port located in the joint ring, and the outer diameter of the detachment restriction portion is set to the insertion side. The diameter of the pipe support part on one end side of the joint ring is larger than the inner diameter of the pipe support part. It is configured to abut on the support portion from the direction of the tube axis to prevent further detachment movement.

Japanese Unexamined Patent Publication No. 2016-138637

In the pipe mounting structure shown in Patent Document 1, when the insertion port and the receiving port are separated from each other, the separation restricting portion sandwiched and fixed to the insertion port only abuts on the pipe support portion on one end side of the joint ring from the direction of the tube axis. Therefore, it does not have a function of restricting bending between the insertion port and the pipe support portion on one end side of the joint ring. Therefore, when the insertion port and the receiving port are separated from each other, the insertion port and the pipe support portion on one end side of the joint ring are greatly bent, and the seal provided on the inner peripheral surface of the pipe support portion on one end side of the joint ring. There is a disadvantage that the sealing property in the circumferential direction of the portion is locally deteriorated, and fluid leaks from the portion where the sealing property is deteriorated.

In view of this situation, the main subject of the present invention is bending of the insertion port and the pipe support portion on one end side of the joint ring while surely restricting further separation movement when the insertion port and the receiving port are separated from each other. It is an object of the present invention to provide a pipe connection portion detachment prevention structure capable of maintaining a state within an appropriate range and suppressing fluid leakage due to a local deterioration of the seal portion in the circumferential direction.

In the first characteristic configuration according to the present invention, a joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both pipe portions. The joint ring and the other portion of the pipe portion facing each other in the pipe axis direction are separated from each other to prevent the joint ring from moving more than a certain relative distance. It is a disconnection prevention structure of the pipe connection part provided with the movement blocking means.
On the other hand, the pipe portion has a connecting portion fixedly connected to the pipe support portion on one end side in the pipe axis direction of the joint ring, which is externally supported by the pipe portion, and a pipe support portion on one end side of the joint ring. A point is that a reinforcing and fixing means having a split structure is provided, which is provided with a retaining portion in which the retaining resistance with the outer peripheral surface of the insertion is increased as the insertion is detached and moved.

According to the above configuration, when a detachment force due to an earthquake, uneven subsidence, etc. acts on the fitting connection portion between the insertion port and the receiving port, the receiving side of the other pipe portion and the joint ring are separated from each other. With the detachment movement preventing means provided at the portions facing each other in the direction of the tube axis, it is possible to prevent the contact between the receiving port of the other tube portion and the joint ring and the relative detachment movement of a certain level or more.
Further, between the insertion port of one of the pipe portions and the joint ring, the connecting portion of the reinforcing and fixing means of the split structure provided at the insertion port is fixedly connected to the pipe support portion on one end side of the joint ring. Further, the retaining portion of the reinforcing and fixing means increases the retaining resistance with the outer peripheral surface of the insertion port as the insertion opening moves away from the pipe support portion on one end side of the joint ring. The insertion port of one pipe portion and the pipe support portion on one end side of the joint ring are integrally and firmly fixedly connected via the reinforcing fixing means.
As a result, even if the insertion port and the receiving port are separated from each other, the receiving port can be moved out of the pipe support portion on the other end side of the joint ring and the insertion port can be moved out of the pipe support portion on one end side of the joint ring. It can be strongly blocked.

Moreover, since the pipe 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 from each other in the direction of the pipe axis at the insertion port of the pipe portion, the insertion port and the receiving port can be separated. When detached, bending between the insertion port and the pipe support portion on one end side of the joint ring can be suppressed.

Therefore, when the insertion port and the receiving port are separated from each other, the pipe support portion on one end side of the insertion opening and the joint ring is surely regulated by the cooperation of the separation movement preventing means and the reinforcing fixing means. It is possible to maintain the bent state with and in an appropriate range and suppress fluid leakage due to a local deterioration of the seal in the circumferential direction of the seal portion.

The second characteristic configuration according to the present invention is that the detachment movement preventing means is on the inner peripheral surface side of the pipe support portion on the other end side in the pipe axis direction of the joint ring and with the outer peripheral surface of the other pipe portion. The point is that it is composed of a detachment preventing portion that can come into contact with the outer peripheral surface of the receiving port formed at a portion displaced toward the center side in the tube axis direction of the joint ring from the sealing portion that seals the space.

According to the above configuration, when a detachment force due to an earthquake or uneven subsidence acts on the fitting connection portion between the insertion port and the receiving port, it is formed on the inner peripheral surface side of the pipe support portion on the other end side of the joint ring. The detached blocking portion is brought into contact with the outer peripheral surface of the receiving port, and further detachment movement of both can be prevented.
At this time, when the detachment preventing portion of the joint ring comes into contact with the tapered portion of the outer peripheral surface of the receiving port, a force is generated to push open the divided surface of the joint ring of the divided structure. However, in the present invention, since the detachment prevention portion of the joint ring is formed at a portion displaced toward the center side in the tube axis direction of the joint ring from the seal portion, the pushing-opening force is reduced by the deviation allowance. Therefore, it is possible to suppress the occurrence of fluid leakage due to the deterioration of the sealing property of the sealing portion due to the push-opening of the split surface of the joint ring.

Further, when the insertion port and the receiving port are separated from each other and the pipe support portion on the other end side of the joint ring and the receiving port on the other pipe portion are bent, the seal portion provided on the pipe support portion on the other end side is provided. Then, since the pipe portion on the receiving port side is supported at two points, that is, the pipe portion on the receiving side is supported by the detachment preventing portion that is displaced toward the center side in the pipe axis direction of the joint ring, so that bending of both can be suppressed. As a result, the bent state of the pipe portion on the receiving side and the pipe support portion on the other end side of the joint ring is maintained within an appropriate range, and the fluid caused by the local deterioration of the sealing property in the circumferential direction of the sealing portion. Leakage can be suppressed.

The third characteristic configuration according to the present invention is that the detachment movement preventing means faces the contact surface formed on the inner surface of the side wall portion on the other end side in the tube axis direction of the joint ring and the contact surface thereof in the tube axis direction. The contact member is fixed to the receiving side, and the contact surface of the joint ring and the contact surface of the contact member are formed as orthogonal surfaces orthogonal to the tube axis. It is in the point that it is done.

According to the above configuration, when a detachment force due to an earthquake or uneven subsidence acts on the fitting connection portion between the insertion port and the receiving port, the contact formed on the inner surface of the side wall portion on the other end side of the joint ring. The surface and the contact member fixed to the receiving port side come into contact with each other from the direction of the tube axis, and further detachment movement between the pipe portion on the receiving port 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 on an orthogonal surface orthogonal to the tube axis, the contact surface of the joint ring and the contact member The contact surface of the surface is in a surface contact state along the orthogonal direction. As a result, the detachment force can be reliably received and the detachment prevention effect can be improved, and the push-opening force of the split joint acting on the joint ring at the time of contact is reduced, so that the joint ring has a sealing property at the split joint. The decrease can be suppressed.

The fourth characteristic configuration according to the present invention is that the distance from the contact position of the detachment prevention portion to the seal holding groove of the seal portion is one of the pipes on the inner peripheral surface of the pipe support portion on one end side of the joint ring. Of both partition walls of the seal holding groove of the seal portion that seals between the outer peripheral surface of the portion, the point is that the partition wall on the inner side is configured to be larger than the thickness dimension in the pipe axis direction.

According to the above configuration, the thickness dimension corresponding to the distance from the contact position of the detachment prevention portion of the joint ring to the seal holding groove of the seal portion is the inner side of the seal holding groove in the pipe support portion on one end side of the joint ring. Since it is configured to be larger than the thickness dimension of the partition wall of the above, the detachment prevention portion that abuts on the outer peripheral surface of the receiving port can be firmly configured. Moreover, it is possible to further suppress the occurrence of fluid leakage due to the deterioration of the sealing property of the sealing portion due to the push-opening of the split surface of the joint ring.

The fifth characteristic configuration according to the present invention is a portion that is displaced from the inner peripheral surface of the pipe support portion on the other end side of the joint ring and toward the center side in the tube axis direction of the joint ring from the detachment prevention portion. Is provided with an elastic sealing material that seals between the detachment preventing portion and the outer peripheral surface of the receiving port in a state of being in contact with the outer peripheral surface of the receiving port.

According to the above configuration, when a detachment force due to an earthquake or uneven subsidence acts on the fitting connection portion between the insertion port and the receiving port, it is formed on the inner peripheral surface side of the pipe support portion on the other end side of the joint ring. The detached blocking portion is in contact with the outer peripheral surface of the receiving port to prevent further detachment movement of both. At this time, the coating protective layer such as powder coating formed on the outer peripheral surface of the receiving port with which the detachment preventing portion abuts is damaged, but is displaced toward the center side of the joint ring in the tube axis direction from the detachment preventing portion. Since the elastic sealing material provided at the site seals between the outer peripheral surface of the receiving port, fluid does not flow into the damaged part of the covering protective layer, and the receiving part at the damaged part of the covering protective layer. The progress of corrosion can be suppressed.

The sixth characteristic configuration according to the present invention is that the connecting portion of the reinforcing and fixing means is attached to and detached from the outer side in the pipe radial direction with respect to the engaging recess formed on the outer peripheral surface of the pipe support portion on one end side of the joint ring. The point is that it is composed of engaging protrusions that can be engaged.

According to the above configuration, the engaging protrusion constituting the connecting portion of the reinforcing and fixing means engages with the engaging 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. Since they are fitted together, it is possible to suppress bending between the insertion port of one pipe portion and the pipe support portion on one end side of the joint ring when the insertion port and the receiving port are separated from each other. As a result, the bent state between the insertion port of the pipe portion and the pipe support portion on one end side of the joint ring is maintained within an appropriate range, and the fluid leaks due to the local deterioration of the sealing property in the circumferential direction of the seal portion. Can be suppressed.

The seventh characteristic configuration according to the present invention is that the contact member has a split structure that can be held and fixed to a bent portion extending over a tapered outer peripheral surface portion and a straight outer peripheral surface portion on the outer peripheral surface of the socket. The point is that it is composed of rings.

According to the above configuration, when a detachment force due to an earthquake or uneven subsidence acts on the fitting connection portion between the insertion port and the receiving port, the contact formed on the inner surface of the side wall portion on the other end side of the joint ring. The surface and the contact surface of the holding ring held and fixed to the bent portion on the outer peripheral surface of the receiving port come into contact with each other from the direction of the tube axis. The holding ring abuts on the tapered outer peripheral surface portion of the outer peripheral surface of the receiving port, and can firmly receive the detaching force. Nevertheless, 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 pushing-opening force of the split joint acting on the joint ring at the time of contact. Can be reduced to suppress deterioration of the sealing property at the split joint portion of the joint ring.

Partial sectional view of the disassembled state which shows 1st Embodiment of the detachment prevention structure of a pipe connection part Overall cross-sectional view at the time of assembly Enlarged cross-sectional view of the main part at the time of assembly Overall cross-sectional view at the time of withdrawal Overall sectional view at the time of assembly (a) and at the time of detachment (b) showing the second embodiment of the disconnection prevention structure of the pipe connection portion. Enlarged view of the main part showing the third embodiment of the disconnection prevention structure of the connection part Overall sectional view at the time of assembly (a) and at the time of disconnection (b) showing the fourth embodiment of the disconnection prevention structure of the pipe connection portion. Enlarged view of the T-head bolt side showing another two embodiments (a) and (b) of the fourth embodiment. Overall sectional view at the time of assembly (a) and at the time of disconnection (b) showing the fifth embodiment of the disconnection prevention structure of the pipe connection portion. Overall sectional view at the time of assembly (a) and at the time of detachment (b) showing the sixth embodiment of the disconnection prevention structure of the pipe connection portion. Overall sectional view at the time of assembly which shows the 7th Embodiment of the detachment prevention structure of a pipe connection part. Overall sectional view at the time of assembly (a) and at the time of disconnection (b) showing the eighth embodiment of the disconnection prevention structure of the pipe connection portion.

[First Embodiment]
1 and 2 show a disconnection prevention structure of a pipe connection portion used in a fluid transport piping system. In this disconnection prevention structure of the pipe connection portion, the insertion port 1A of the fluid pipe 1 which is an example of one pipe portion and the receiving port 2A of the fluid pipe 2 which is an example of the other pipe portion are connected by the fitting connection portion 20. The joint ring 30 having a split structure that surrounds the fitting connection portion 20 in a sealed state is exteriorized over both fluid pipes 1 and 2.
Further, at a portion where the joint ring 30 and the receiving port 2A side of the other fluid pipe 2 face each other in the pipe axis direction, the receiving port 2A of the other fluid pipe 2 and the joint ring 30 are separated from each other by a certain amount or more. A detachment movement preventing means 40 for preventing the movement from coming into contact is provided.

In the above-mentioned disconnection prevention structure of the pipe connection portion, the fluid pipes 1 and 2 are taken as an example of the pipe portion, but there are various types of pipe portions conventionally. For example, although not shown, it constitutes a branch pipe portion of a split T-shaped pipe that is externally fixed to the fluid pipe in a sealed state, a branch pipe portion that is integrally projected from the fluid pipe, and a part of fluid equipment. The tube part and the like can be mentioned.
Further, the fluid pipes 1 and 2 of the present embodiment are ductile cast iron pipes constituting a water pipe for transporting clean water, which is an example of a fluid, but other cast iron pipes, steel pipes and the like can be used. ,
Examples of the fluid include industrial water and gas in addition to clean water.

As shown in FIGS. 1 to 3, 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 composed of a K-shaped mechanical joint. In this K-shaped mechanical joint, a first sealing member 21 such as a rubber ring is mounted between the outer peripheral surface 1a of the insertion port 1A and the tapered inner peripheral surface 2a of the receiving port 2A. A push ring 22 having a split structure provided with a pressing portion 22a capable of pressing the first seal member 21 from the pipe axis direction is exteriorized at the insertion port 1A. The flange portion 22b of the push ring 22 and the flange portion 2b of the receiving port 2A are fastened and connected by a T-head bolt 23 and a nut 24 from the pipe axis direction. By this tightening connection, the first seal member 21 is compressed into a watertight state (sealed state) by the pressing portion 22a of the push ring 22 that is attracted and fixed to the flange portion 2b of the receiving port 2A, and the watertight state is maintained.

As shown in FIGS. 2 and 3, the joint ring 30 is made of cast iron having a bifurcated structure that can be freely exteriorized over both fluid pipes 1 and 2 while surrounding the fitting connection portion 20 of both fluid pipes 1 and 2. It is composed of both split joint wheel cases 30A and 30B. The joint ring 30 has a cylindrical peripheral wall portion 30a having a diameter larger than that of the receiving port 2A, and an annular side wall portion 30b extending radially inward from both ends of the peripheral wall portion 30a in the pipe axis direction. , 30c and cylindrical pipe support portions 30d, 30e extending integrally outward along the pipe axis direction from the inner diameter side ends of the side wall portions 30b, 30c are provided as the main configurations. There is.

As shown in FIG. 1, connecting flange portions 30C for fixing and connecting to both ends of the joint ring 30 divided joint ring cases 30A and 30B via fastening means such as bolts 31 and nuts 32, as shown in FIG. Is integrally formed. The split surface of the split joint ring cases 30A and 30B is between the inner peripheral surface 30f of the joint ring 30 (see FIG. 2) and the outer peripheral 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 water tightly to the outside.
As shown in FIGS. 2 and 3, the seal portion 35 has a second seal member 37 such as an annular gasket in the annular seal holding groove 36 formed on each of the divided surfaces of the two divided joint ring cases 30A and 30B. It is configured by wearing. Both second seal members 37 are in contact with each other in a watertight state from the pipe radial direction at both ends of the pipe circumferential direction of the split joint ring cases 30A and 30B, and both at both pipe support portions 30d and 30e of the joint ring 30. It contacts the outer peripheral surfaces 1a and 2c of the fluid pipes 1 and 2 in a watertight state along the pipe circumferential direction.

As shown in FIGS. 2 to 4, the detachment movement preventing means 40 is on the inner peripheral surface side of the pipe support portion 30e on the other end side in the pipe axis direction of the joint ring 30 and inside the pipe support portion 30e. The pipe circumferential seal groove portion 36a of the seal holding groove 36 formed on the peripheral surface and the pipe circumferential seal portion 37a of the second seal member 37 mounted on the seal holding groove 36 are displaced toward the center side in the pipe axis direction of the joint ring 30. A detachment prevention portion 41 having an outer peripheral surface 2c of the receiving port 2A and an annular contact surface 41a capable of contacting from the direction of the tube axis is formed on the portion.
The detachment preventing portion 41 is formed to have a diameter smaller than the inner diameter of the partition wall 30g located on both sides of the pipe circumferential direction seal groove portion 36a in the pipe axis direction on the inner peripheral surface of the pipe support portion 30e on the other end side. In other words, the inner peripheral surface of the detachment preventing portion 41 is formed so as to project radially inward from the inner peripheral surface of the partition wall 30g located on both sides of the pipe circumferential seal groove portion 36a, and also prevents detachment. The portion 41 is integrally formed with one of the partition walls 30 g, and has a reinforcing structure in which the thickness in the pipe axis direction from the contact surface 41a of the detachment prevention portion 41 to the seal portion 35 is large.
Further, the contact surface 41a of the detachment preventing portion 41 is formed at the same or substantially the same inclination angle as the inclination angle of the tapered contact portion 2d of the outer peripheral surface 2c of the receiving port 2A.

Then, when a detachment force due to an earthquake, uneven subsidence, or the like acts on 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, the other fluid pipe 2 Between the receiving port 2A and the pipe support portion 30e on the other end side of the joint ring 30, the contact surface 41a of the detachment preventing portion 41 and the receiving port 2A provided at the portions facing each other in the direction of the core of the pipe. Contact with the tapered contact portion 2d of the outer peripheral surface 2c prevents the relative separation movement of the other fluid pipe 2 from the receiving port 2A and the pipe support portion 30e on the other end side of the joint ring 30 by a certain amount or more. 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 30b on one end side 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 detachment preventing portion 41 formed on the pipe support portion 30e on the other end side of the joint ring 30 hits the tapered contact portion 2d of the outer peripheral surface 2c of the receiving port 2A. The state of contact is the maximum withdrawal movement state.
As a result, as shown in FIG. 4, the tip of the T-head bolt 23 is in the maximum detached movement state from the tip position of the T-head bolt 23 or the inner surface of the side wall portion 30b on one end side of the joint ring 30 in the initial assembly state. The distance L to the position is the maximum detachment movement distance, and in the maximum detachment movement state, the insertion port 1A of one fluid tube 1 and the receiving port 2A of the other fluid tube 2 are in the detached state.

Then, as described above, a detaching force due to an 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 portion 30e on the other end side of the joint ring 30 acts. When the contact surface 41a of the detachment blocking portion 41 formed on the inner peripheral surface side abuts on the tapered contact portion 2d of the outer peripheral surface 2c of the receiving port 2A, a force that pushes open the divided surface of the joint ring 30 of the divided structure. Occurs. However, in the present invention, the detachment preventing portion 41 of the joint ring 30 is formed at a portion deviated from the pipe circumferential direction seal groove portion 36a of the seal portion 35 toward the center side in the pipe axis direction of the joint ring 30. The pushing-opening force is reduced by the amount of the deviation allowance, and it is possible to suppress the occurrence of fluid leakage due to the deterioration of the sealing property (decrease in surface pressure) of the sealing portion 35 due to the pushing-opening of the divided surface of the joint ring 30.

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

Further, as shown in FIGS. 1 to 4, the division is an example of the reinforcing and fixing means for integrally fixing and connecting one of the fluid pipes 1 and the pipe support portion 30d on one end side in the pipe axis direction of the joint ring 30. A seismic retrofitting metal fitting 50 having a structure is provided. As shown in FIG. 1, the seismic retrofitting metal fitting 50 is divided into two in the pipe circumferential direction, and is sandwiched and fixed to the insertion port 1A of one fluid pipe 1 in a detachable manner from the pipe radial direction. A metal split holding member 51 is provided. The pair of split holding members 51 are firmly held and fixed to the insertion port 1A of the fluid pipe 1 by tightening and connecting the flange portions 51A provided at both ends in the pipe circumferential direction with bolts 48 and nuts 49. Will be done.

As shown in FIGS. 2 to 4, the seismic retrofitting metal fitting 50 has a connecting portion 52 fixedly connected to the pipe support portion 30d on one end side of the joint ring 30 and a pipe support portion 30d on one end side of the joint ring 30. A retaining portion 55 is provided so that the retaining resistance with the outer peripheral surface 1a of the insertion port 1A increases as the insertion port 1A is detached and moved.
The connecting portion 52 engages with an annular engaging recess 53 formed on the outer peripheral surface of the pipe support portion 30d on one end side and opening outward in the radial direction from the outer side in the pipe direction with respect to the engaging recess 53. It is composed of an engaging protrusion 54 that is detachably engaged. Among them, the engaging protrusions 54 are integrally projected from a plurality of locations in the pipe circumferential direction of the two-divided holding member 51 along the pipe axis direction.
When the seismic reinforcing metal fitting 50 is attached to the insertion port 1A of the fluid pipe 1, as shown in FIGS. 1 and 2, the engaging protrusion 54 integrally formed with the two split holding members 51 is supported by the pipe on one end side. It engages with the engaging 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 two split holding members 51 are fastened and connected with the bolt 48 and the nut 49.

As shown in FIGS. 1 and 2, the retaining portion 55 is provided in the claw storage portion 56 formed on the inner peripheral surface of the split holding member 51 and opening inward in the radial direction, and in the claw storage portion 56. It is provided with a claw member 57 that is movably accommodated inward in the radial direction of the pipe. On the inner surface of the claw member 57, a plurality of rows of sharp tapered blades along the circumferential direction of the pipe that can bite into the outer peripheral surface 1a of the insertion port 1A are formed.
The outer surface of the claw member 57 and the ceiling surface of the claw storage portion 56 are housed in the claw storage portion 56 in a state of biting into the claw storage portion 56 of the double-split holding member 51 and the outer peripheral surface 1a of the insertion port 1A. It is configured on an inclined surface that bites and moves the claw member 57 inward in the radial direction as the claw member 57 moves away from the tube axis in the direction of the core of the tube.

Then, when a detaching force due to an earthquake, uneven subsidence, or the like acts on 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, one of the fluid pipes 1 Between the insertion port 1A and the joint ring 30, the connecting portion 52 of the seismic reinforcing metal fitting 50 having a split structure provided in the insertion port 1A is fixedly connected to the pipe support portion 30d on one end side of the joint ring 30. Further, the claw member 57 of the retaining portion 55 of the seismic retrofitting metal fitting 50 is removed by biting into the outer peripheral surface 1a of the insertion port 1A as the insertion port 1A is detached and moved with respect to the pipe support portion 30d on one end side of the joint ring 30. Stop resistance increases. Therefore, as a whole, the insertion port 1A of one of the fluid pipes 1 and the pipe support portion 30d on one end side of the joint ring 30 are integrally and firmly firmly fixed and connected via the seismic retrofitting metal fitting 50.
As a result, as shown in FIG. 4, even if the insertion port 1A and the receiving port 2A are separated from each other, the receiving port 2A moves out of the pipe support 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 prevent the insertion / exit movement of the insertion port 1A with respect to the pipe support portion 30d on the side.

Moreover, the pipe support portion 30d on one end side of the joint ring 30 and the retaining portion 55 of the seismic reinforcing metal fitting 50 support two locations spaced apart in the pipe axis direction at the insertion port 1A of the fluid pipe 1. As shown in 4, when the insertion port 1A and the receiving port 2A are separated from each other, bending of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30 can be suppressed.

Further, the engaging protrusion 54 constituting the connecting portion 52 of the seismic reinforcing metal fitting 50 is on the outer side in the pipe radial direction with respect to the engaging recess 53 formed on the outer peripheral surface of the pipe support portion 30d on one end side of the joint ring 30. When the insertion port 1A and the receiving port 2A are separated from each other, the insertion port 1A of one of the fluid pipes 1 and the pipe support portion 30d on one end side of the joint ring 30 can be suppressed from bending. can. As a result, the bent state of the insertion port 1A of the fluid pipe 1 and the pipe support portion 30d on one end side of the joint ring 30 is maintained within an appropriate range, and the sealing performance of the seal portion 35 in the circumferential direction is reduced. The resulting fluid leakage can be suppressed.
[Second Embodiment]
In the disconnection prevention structure of the pipe connection portion shown in FIG. 5, 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 composed of a T-shaped mechanical joint. There is. This T-shaped mechanical joint is formed between the outer peripheral surface 1a of the insertion port 1A and fitted to the annular seal holding groove 60 formed on the inner peripheral surface of the receiving port 2A and opened inward in the radial direction. It is configured by mounting a third seal member 61 such as a rubber ring that is compressed into a watertight state.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Third Embodiment]
In the disconnection prevention 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 composed of a T-shaped mechanical joint. There is. In the detachment prevention structure of the pipe connection portion, an improvement of the detachment movement preventing means 40 for contacting and preventing the relative detachment movement between the receiving port 2A of the other fluid pipe 2 and the joint ring 30 above a certain level is shown. Also in this embodiment, the seal holding groove 36 formed on the inner peripheral surface side of the pipe support portion 30e on the other end side in the pipe axis direction of the joint ring 30 and on the inner peripheral surface of the pipe support portion 30e. The outer peripheral surface 2c of the receiving port 2A is located at a portion displaced toward the center of the joint ring 30 in the pipe axis direction from the pipe peripheral direction seal groove portion 36a and the pipe circumferential direction seal portion 37a of the second seal member 37 mounted on the pipe circumferential seal groove portion 36a. A detachment prevention portion 41 having an annular contact surface 41a capable of contacting the tapered contact portion 2d from the pipe axis direction is formed.

On the inner peripheral surface of the pipe support portion 30e on the other end side of the joint ring 30, and at a portion deviated from the detachment prevention portion 41 toward the center of the joint ring 30 in the pipe axis direction, the detachment prevention portion 41 is applied. An annular elastic sealing material 43 is provided to seal between the contact surface 41a and the outer peripheral surface 2c of the receiving port 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 receiving port 2A.
The second seal holding groove 44 for holding the contact surface 41a of the detachment preventing portion 41 and the elastic sealing material 43 is formed on the inner peripheral surface of the side wall portion 30c on the other end side of the joint ring 30, and the side wall portion on the other end side. The thickness of the 30c in the tube axis direction is larger than the thickness of the side wall portion 30b on one end side of the joint ring 30 in the tube axis direction (see FIGS. 2 in the first embodiment and FIG. 5 in the second embodiment). Has been done.

When a detachment force due to an earthquake, uneven subsidence, etc. acts on 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, the other end side of the joint ring 30 The contact surface 41a of the detachment blocking portion 41 formed on the inner peripheral surface side of the pipe support portion 30e abuts on the tapered contact portion 2d of the outer peripheral surface 2c of the receiving port 2A, and further detachment movement of both is possible. Be blocked. At this time, the covering protective layer such as powder coating formed on the outer peripheral surface 2c of the receiving port 2A to which the contact surface 41a of the detachment preventing portion 41 abuts is damaged, but from the contact surface 41a of the detachment preventing portion 41. Since the elastic sealing material 43 provided at the portion displaced toward the center of the pipe axis of the joint ring 30 seals between the receiving port 2A and the outer peripheral surface 2c, the fluid is located at the damaged portion of the coating protective layer. Can be prevented from flowing in, and the progress of corrosion of the receiving port 2A at the damaged portion of the coating protective layer can be suppressed.
Since the other configurations are the same as the configurations described in the second embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Fourth Embodiment]
In the disconnection prevention structure of the pipe connection portion shown in FIG. 7, 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 composed of a K-shaped mechanical joint. .. In the detachment prevention structure of the pipe connection portion, an improvement of the detachment movement preventing means 40 for contacting and preventing the relative detachment movement between the receiving port 2A of the other fluid pipe 2 and the joint ring 30 above a certain level is shown.
The detachment movement preventing means 40 of this embodiment is a plurality of metal T-head bolts arranged at predetermined intervals in the circumferential direction of the pipe among the constituent members of the K-shaped mechanical joint constituting the fitting connection portion 20. 23 is also configured as a 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 configured as the contact surface 45a of the contact member 45. There is.

Further, of the inner surface of the side wall portion 30c on the other end side in the pipe axis direction of the joint ring 30, the inner surface portion facing the head portion 23A of each T head bolt 23 in the pipe axis direction is configured as the contact surface 46. ing.
Each of 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 having the top surface 23a of the head portion 23A of each T-head bolt 23 is on the pipe axis. It is formed on orthogonal planes that are orthogonal to each other.

When a detachment force due to an earthquake, uneven subsidence, etc. acts on 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, the other end side of the joint ring 30 The contact surface 45a of the contact member 45 composed of the contact surface 46 formed on the inner surface of the side wall portion 30c and the contact surface 45a of the head portion 23A of each T-head bolt 23 fixed to the receiving port 2A side. Abuts on the surface from the direction of the tube axis, and further detachment movement between the receiving port 2A of the fluid tube 2 and the joint ring 30 is prevented. The contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45 having the contact surface 45a of each T-head bolt 23 reliably receive the detachment force and prevent the detachment. Can be improved.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

Further, in the above-mentioned fourth embodiment, the flat top surface 23a of the head portion 23A of each T-head bolt 23 is configured on the contact surface 45a of the contact member 45, but as shown in FIG. 8A, A contact member 45 having a contact surface 46 of the side wall portion 30c of the joint ring 30 and a contact surface 45a capable of contacting from the pipe axis direction is integrally formed on the head portion 23A of each T-head bolt 23. 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 in each T-head bolt 23 on the receiving port 2A side are formed on an orthogonal surface orthogonal to the pipe axis. .. As a result, the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45 in each T-head bolt 23 come into contact with each other, and the detachment force can be reliably received to improve the detachment prevention effect.

Further, as shown in FIG. 8B, a contact surface 46a of the side wall portion 30c of the joint ring 30 and a contact surface 45a capable of contacting from the pipe axis direction are provided on the head portion 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 in each T-head bolt 23 on the receiving port 2A side are formed on an orthogonal surface orthogonal to the pipe axis. .. As a result, the contact surface 46 of the joint ring 30 and the contact surface 45a of the contact member 45B in each T-head bolt 23 come into contact with each other, and the detachment force can be reliably received to improve the detachment prevention effect.

[Fifth Embodiment]
In the disconnection prevention structure of the pipe connection portion shown in FIG. 9, 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 composed of a T-shaped mechanical joint. .. In the detachment prevention structure of the pipe connection portion, an improvement of the detachment movement preventing means 40 for contacting and preventing the relative detachment movement between the receiving port 2A of the other fluid pipe 2 and the joint ring 30 above a certain level is shown.
In the detachment 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 held 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 having a fixed split structure (two split structure in the embodiment) is used. The contact band 70 is provided with an annular first positioning portion 70b that abuts on the end surface of the receiving port 2A on the connection port side and a second positioning portion 70c that abuts on the tapered portion of the outer peripheral surface 2c of the receiving port 2A. Has been 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 first positioning portion 70b and the second positioning portion 70c prevent the contact band 70 from moving in the tube axis direction. ..

The tip 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 is the inner surface of the side wall portion 30c on the other end side in the pipe axis direction of the joint ring 30. The contact surface 46 is formed with an inner surface portion facing the contact surface 45a formed by the tip surface 70a of the second positioning portion 45c of the contact band 70 in the direction of the tube axis.

Also in this case, the contact surface 46 of the joint ring 30 and the contact surface 45a formed by the tip surface 70a of the contact band 70 fixed to the receiving port 2A are orthogonal to the pipe 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 contact with each other, and the detachment force can be reliably received to improve the detachment prevention effect.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the second embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Sixth Embodiment]
In the disconnection prevention 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 composed of a K-shaped mechanical joint. .. In the detachment prevention structure of the pipe connection portion, an improvement of the detachment movement preventing means 40 for contacting and preventing the relative detachment movement between the receiving port 2A of the other fluid pipe 2 and the joint ring 30 above a certain level is shown.
The detachment 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 engages with the flange portion 2b of the receiving port 2A from the outside in the pipe radial direction. A metal receiving band 71 that is held and fixed in the combined state is used. The tip surface 71a of the receiving band 71 is formed on the contact surface 45a of the contact member 45, and the tip of the receiving band 71 is among the inner surfaces of the side wall portion 30c on the other end side in the pipe axis direction of the joint ring 30. The contact surface 46 is formed with an inner surface portion facing the contact surface 45a having the surface 71a in the direction of the tube axis.

Also in this case, each of the contact surfaces 45a formed by the contact surface 46 of the joint ring 30 and the tip surface 71a of the receptacle band 71 fixed to the receptacle 2A is an orthogonal surface orthogonal to the pipe axis. Is formed in. As a result, the contact surface 46 of the joint ring 30 and the contact surface 45a of the receiving band 71 come into contact with each other, and the detaching force can be reliably received to improve the detaching preventing effect.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[7th Embodiment]
In the disconnection prevention 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 composed of a K-shaped mechanical joint. .. In the disconnection prevention structure of the pipe connection portion, a seismic retrofitting metal fitting (reinforcing and fixing means) having a split structure in which one fluid pipe 1 and the pipe support portion 30d on one end side in the pipe axis direction of the joint ring 30 are integrally fixedly connected. Example) 50 improvements are shown.
In the seismic reinforcing metal fitting 50 of this embodiment, of the pipe support portion 30d on one end side in the pipe axis direction of the joint ring 30, the pipe peripheral direction seal groove portion 36a of the seal holding groove 36 formed on the inner peripheral surface thereof. And an extension pipe support portion provided with an annular space that opens inward in the radial direction on the end side located on the seismic reinforcing metal fitting 50 side with respect to the pipe circumferential seal portion 37a of the second seal member 37 attached thereto. 30j is integrally formed.

An annular engaging recess 53 that opens radially outward is formed on the outer peripheral surface of the pipe support portion 30d on one end side including the extension pipe support portion 30j, and the extension pipe support portion in the engaging recess 53 is formed. An engaging protrusion 54 integrally formed with the double-split holding member 51 of the seismic reinforcing metal fitting 50 is engaged with the outer end side portion of the range corresponding to 30j from the outside in the pipe radial direction.

In the case of this embodiment, the engagement position of the seismic reinforcing metal fitting 50 with the pipe support portion 30d on one end side of the joint ring 30 by the engagement protrusion 54 is the seal holding groove 36 formed on the inner peripheral surface of the pipe support portion 30d. The pipe circumferential seal groove portion 36a and the second seal member 37 mounted on the pipe circumferential seal groove portion 37a are separated from the pipe circumferential seal groove portion 37a toward the outer end side. Therefore, as shown in FIG. 4, when the insertion port 1A and the receiving port 2A are separated from each other, bending of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30 can be suppressed. As a result, the bent state of the insertion port 1A of the fluid pipe 1 and the pipe support portion 30d on one end side of the joint ring 30 is maintained within an appropriate range, and in the circumferential direction of the pipe circumferential seal groove portion 36a of the seal portion 35. It is possible to suppress the leakage of fluid due to the local deterioration of the sealing property.

[Eighth Embodiment]
In the disconnection prevention 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 composed of a K-shaped mechanical joint. .. In the detachment prevention structure of the pipe connection portion, an improvement of the detachment movement preventing means 40 for contacting and preventing the relative detachment movement between the receiving port 2A of the other fluid pipe 2 and the joint ring 30 above a certain level is shown.
The detachment 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 has a tapered outer peripheral surface portion 2e and a straight shape on the outer peripheral surface 2c of the receiving port 2A. A metal holding ring 80 having a split structure (in the embodiment, a two-split structure) that can be held and fixed in a flexible manner from the outside in the radial direction with respect to the bent portion extending over the outer peripheral surface portion 2f is used. The holding ring 80 is provided with a semicircular split ring 80A that is split into two in the circumferential direction of the pipe. The pair of split rings 80A are firmly sandwiched and fixed to the bent portion of the receiving port 2A by tightening and connecting the connecting pieces 80B provided at both ends in the pipe circumferential direction with bolts 81.
One end surface 80a of the holding ring 80 in the direction of the tube axis is configured as a tapered end surface that abuts on the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A in a surface contact state. The other end surface 80b of the holding ring 80 in the tube axis direction includes the other end surface of the split 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 configured in 45a. The inner surface of the side wall portion 30c on the other end side in the pipe axis direction of the joint ring 30 is a contact surface 46 capable of contacting the contact surface 45a formed by the other end surface 80b of the holding ring 80 from the pipe axis direction. It is configured in. The contact surface 46 formed by the inner surface of the side wall portion 30c of the joint ring 30 and the contact surface 45a formed by the other end surface 80b of the holding ring 80 are formed on orthogonal surfaces orthogonal to the pipe axis. ing.

Then, when a detaching force due to an earthquake, uneven subsidence, or the like acts on 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, the other end of the joint ring 30 is formed. The contact surface 46 formed on the inner surface of the side wall portion 30c abuts on the contact surface 45a of the holding ring 80 held and fixed to the bent portion on the outer peripheral surface 2c of the receiving port 2A from the direction of the tube axis. The tapered one end surface 80a of the holding ring 80 abuts on the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A in a surface contact state from the pipe axis direction, and can firmly receive the detaching force. Nevertheless, since the contact surface 46 of the joint ring 30 and the contact surface 45a of the holding ring 80 are in a surface contact state along the direction orthogonal to the tube axis, the split joint portion that acts on the joint ring 30 at the time of contact. It is possible to reduce the pushing-opening force of the joint ring 30 to suppress a decrease in sealing performance (a decrease in the surface pressure of the second seal member 37) at the split joint portion of the joint ring 30.
Since the other configurations are the same as the configurations described in the first embodiment, the same numbers as those in the first embodiment are added to the same configuration parts, and the description thereof will be omitted.

[Other embodiments]
(1) In the above-mentioned first embodiment, as shown in FIG. 3, the tip 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 portion 30b 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 allowance with the tapered contact portion 2d of the outer peripheral surface 2c of the receiving port 2A. It may be reduced or configured less.

(2) In the above-mentioned first embodiment, the contact surface 41a of the detachment preventing portion 41 formed on the inner peripheral surface side of the pipe support portion 30e on the other end side of the joint ring 30 is provided with the outer peripheral surface 2c of the receiving port 2A. Although it is configured to directly contact the tapered contact portion 2d of the above, an elastic body may be provided on the contact surface 41a of the detachment preventing portion 41.

(3) In the above-mentioned first embodiment, the connecting portion 52 of the seismic reinforcing metal fitting 50 is provided with an annular engaging recess 53 formed on the outer peripheral surface of the pipe support portion 30d on one end side and opening outward in the radial direction. It is composed of an engaging protrusion 54 that is freely engaged and disengaged with the engaging recess 53 from the outer side in the pipe radial direction, but the present invention is not limited to this configuration. For example, the connecting portion 52 of the seismic retrofitting metal fitting 50 may be composed of bolts and nuts for fixing and connecting the pipe support portion 30d on one end side of the joint ring 30 and the split holding member 51.

1 One pipe (fluid pipe)
1A Insert 2 The other pipe (fluid pipe)
2A Receptacle 2c Outer peripheral surface 2e Tapered outer peripheral surface part 2f Straight outer peripheral surface part 20 Fitting connection part 30 Joint ring 30c Side wall part 30d Pipe support part on one end side 30e Pipe support part on the other end side 35 Seal part 36 Seal holding Groove 40 Detachment movement prevention means 41 Detachment prevention part 41a Contact surface 43 Elastic sealing material 45 Contact member 45a Contact surface 50 Reinforcing and fixing means (seismic retrofitting metal fittings)
52 Connecting part 53 Engagement recess 54 Engagement protrusion 55 Detachment part 70 Abutment band (contact member)
71 Receptacle band (contact member)
80 Holding ring (contact member)

Claims (3)

A joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both the pipe portions, and the joint ring and the other said. A pipe provided with a detachment movement preventing means for abutting and preventing a certain or more relative detachment movement between the receptacle and the joint ring at a portion facing each other in the pipe axis direction with the receiving side of the pipe portion. It is a structure to prevent disconnection of the connection part,
On the other hand, the pipe portion has a connecting portion fixedly connected to the pipe support portion on one end side in the pipe axis direction of the joint ring, which is externally supported by the pipe portion, and a pipe support portion on one end side of the joint ring. A reinforcing and fixing means having a split structure is provided, which is provided with a retaining portion having a retaining portion in which the retaining resistance with the outer peripheral surface of the insertion is increased as the insertion is detached and moved.
The detachment movement preventing means is more than a seal portion that seals between the inner peripheral surface side of the pipe support portion on the other end side in the pipe axis direction of the joint ring and the outer peripheral surface of the other pipe portion. It is composed of a detachment prevention portion that can come into contact with the outer peripheral surface of the receiving port formed at a portion displaced toward the center of the pipe axis direction of the joint ring.
The distance from the contact position of the detachment prevention portion to the seal holding groove of the seal portion is sealed between the inner peripheral surface of the pipe support portion on one end side of the joint ring and the outer peripheral surface of one of the pipe portions. A pipe connection prevention structure that is configured to be larger than the thickness dimension in the pipe axis direction in the inner partition wall of both partition walls of the seal holding groove of the seal portion. A joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both the pipe portions, and the joint ring and the other said. A pipe provided with a detachment movement preventing means for abutting and preventing a certain or more relative detachment movement between the receptacle and the joint ring at a portion facing each other in the pipe axis direction with the receiving side of the pipe portion. It is a structure to prevent disconnection of the connection part,
On the other hand, the pipe portion has a connecting portion fixedly connected to the pipe support portion on one end side in the pipe axis direction of the joint ring, which is externally supported by the pipe portion, and a pipe support portion on one end side of the joint ring. A reinforcing and fixing means having a split structure is provided, which is provided with a retaining portion having a retaining portion in which the retaining resistance with the outer peripheral surface of the insertion is increased as the insertion is detached and moved.
The detachment movement preventing means is more than a seal portion that seals between the inner peripheral surface side of the pipe support portion on the other end side in the pipe axis direction of the joint ring and the outer peripheral surface of the other pipe portion. It is composed of a detachment prevention portion that can come into contact with the outer peripheral surface of the receiving port formed at a portion displaced toward the center of the pipe axis direction of the joint ring.
The detachment preventing portion is located on the inner peripheral surface of the pipe support portion on the other end side of the joint ring and at a portion deviated from the detachment preventing portion toward the center side in the tube axis direction of the joint ring. A disconnection prevention structure for a pipe connection portion provided with an elastic sealing material that seals between the outer peripheral surface of the receiving port and the outer peripheral surface of the receiving port in contact with the outer peripheral surface. A joint ring having a split structure that surrounds the fitting connection portion between the insertion port of one pipe portion and the receiving port of the other pipe portion in a sealed state is exteriorized over both the pipe portions, and the joint ring and the other said. A pipe provided with a detachment movement preventing means for abutting and preventing a certain or more relative detachment movement between the receptacle and the joint ring at a portion facing each other in the pipe axis direction with the receiving side of the pipe portion. It is a structure to prevent disconnection of the connection part,
On the other hand, the pipe portion has a connecting portion fixedly connected to the pipe support portion on one end side in the pipe axis direction of the joint ring, which is externally supported by the pipe portion, and a pipe support portion on one end side of the joint ring. A reinforcing and fixing means having a split structure is provided, which is provided with a retaining portion having a retaining portion in which the retaining resistance with the outer peripheral surface of the insertion is increased as the insertion is detached and moved.
The detachment movement preventing means is fixed to the abutting surface formed on the inner surface of the side wall portion on the other end side in the pipe axis direction of the joint ring and to the receiving side in a state of facing each other in the pipe axis direction. The contact surface of the side wall portion is formed as an orthogonal surface orthogonal to the tube axis.
The fitting connection portion can be compressed into a sealed state by pressing the sealing member mounted between the outer peripheral surface of the insertion port and the inner peripheral surface of the receiving port from the direction of the tube axis. It is provided with a push ring, and a plurality of T-head bolts and nuts for connecting the flange portion of the receiving port and the flange portion of the push ring at a plurality of positions in the pipe circumferential direction.
The contact member is composed of a plurality of the T-head bolts, and each of the top surfaces of the heads of the plurality of T-head bolts faces the contact surface of the side wall portion in the direction of the tube axis. A disconnection prevention structure for the pipe connection part, which is configured on the contact surface that comes into contact with the pipe shaft from the direction of the core of the pipe.

Images