JP2021001626A - Separation prevention structure of pipe connection portion - Google Patents

Abstract

To surely prevent separation movement of a spigot and a socket with respect to a collar while improving a separation force absorption capacity, and to keep a bent state of the spigot and a pipe supporting portion of the collar within a proper range.SOLUTION: A separation prevention structure of a pipe connection portion comprises: a collar 30 which has a split structure surrounding a fitting connection portion 20 between a spigot 1A and a socket 2A in a sealed state, and which is externally mounted; a first separation prevention portion which permits the socket 2A and the spigot 1A to perform relative separation movement up to a position that brings them into a separation state where they are disconnected from each other while preventing the socket 2A and the collar 30 from performing relative separation movement at and exceeding a fixed level in the separation state, and which is disposed on a region where the collar 30 and a socket side of the other pipe portion are relatively opposed to each other in a pipe axial direction; a second separation prevention portion 5 which includes a lock portion 55 for increasing locking resistance with respect to an outer peripheral face 1a of the spigot 1A in accordance with the separation movement of the spigot 1A, and which is disposed at a pipe supporting portion 30d side at one end side of the collar 30; and an inclination restriction portion 9 which restricts inclination of the spigot 1A with respect to the pipe supporting portion 30d at the one end side of the collar 30 in the separation state, and which is disposed in the collar 30.SELECTED DRAWING: Figure 3

Description

In the present invention, a pipe in which 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. Regarding the disconnection prevention structure of the connection part.

As the detachment prevention structure of the pipe connection portion described above, there is a pipe attachment 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. In this mechanical joint, a sealing material such as a rubber ring is attached between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the receiving port. The flange portion of the push ring provided with the pressing portion capable of pressing this sealing material from the direction of the tube axis and the flange portion of the receiving port are tightened and connected with bolts and nuts. By this tightening connection, the sealing material is compressed into a watertight state by the pressing part of the push ring which is attracted 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.

Further, at a portion of the joint ring and the other pipe portion facing each other in the pipe axis direction, there is a detachment movement preventing means for contacting and preventing the relative detachment movement of the joint ring and the joint ring beyond a certain level. It 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. When the insertion port and the receiving port are separated, 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 tube 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 is larger than the inner diameter of the pipe support part on one end side of the joint ring, and when the insertion port and the receiving port are separated, the separation control part that is sandwiched and fixed to the insertion port is the pipe on one end side of the joint ring. 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 control 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 pipe 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 a 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 to surely prevent the insertion and the receiving movement from being detached from the joint wheel while improving the absorption capacity for the disconnection force, and one end side of the insertion and the joint ring. Provides a pipe connection prevention structure capable of maintaining a bent state with the pipe support portion in an appropriate range and suppressing fluid leakage due to a local deterioration of the seal portion in the circumferential direction. There is a point to do.

In the first characteristic configuration of 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. Then, the joint ring and the other portion of the pipe portion facing each other in the pipe axis direction are subjected to a relative detachment movement until the socket and the insertion port are disconnected from each other. A first detachment blocking portion is provided to allow and prevent a certain amount of relative detachment movement between the receiving port and the joint ring in the detached state, and one end side of the joint ring in the pipe axis direction. On the pipe support portion side of the pipe, a second detachment preventing portion is provided, which is provided with a retaining portion in which the retaining resistance with the outer peripheral surface of the insertion opening increases as the insertion opening moves away. The point is that a tilt regulating portion for regulating the tilt of the insertion port with respect to the pipe support portion on one end side of the joint ring is provided in the ring in the detached state.

According to the above configuration, the first detachment preventing portion provided at the portion where the joint ring and the receiving side of the other pipe portion face each other in the pipe axis direction is provided at the fitting connection portion between the insertion port and the receiving port. When a detachment force due to an earthquake or uneven subsidence acts, the relative detachment movement to the detached state where the socket and the insertion port are disconnected is allowed. As a result, it is possible to absorb a large detaching force acting on the fitting connection portion between the insertion port and the receiving port. Nevertheless, since it is possible to reliably prevent contact with the relative detachment movement of the socket and the joint ring beyond a certain level in the detached state, the socket is provided with respect to the pipe support portion on the other end side of the joint ring. I will never get out.

Further, the retaining portion of the second detachment blocking portion provided on the pipe support portion side on one end side in the pipe axis direction of the joint ring is said to be moved as the insertion port is detached from the pipe support portion on one end side of the joint ring. Since the retaining resistance with the outer peripheral surface of the insertion port increases, as a whole, the insertion port of one pipe portion and the pipe support portion on one end side of the joint ring are integrated via the second detachment prevention portion. It is firmly fixed and connected to.
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. Each can be firmly blocked.

Furthermore, when the insertion port and the receiving port are in a detached state, even if a bending force due to an earthquake or an unequal force due to fluid pressure acts, the tilt regulation portion provided in the joint wheel allows the joint wheel to be provided. It is possible to regulate the tilt of the insertion port with respect to the pipe support portion on one end side. As a result, the bent state of the insertion port and the pipe support portion on one end side of the joint ring in the detached state is maintained within an appropriate range, and fluid leakage due to a local deterioration of the seal portion in the circumferential direction is maintained. Can be suppressed.

Therefore, the ability to absorb the detachment force acting on the mating connection portion is improved by the relative detachment movement until the disconnection state in which the socket and the insertion port are disconnected. Even so, when the insertion port and the socket move apart to the detached state, further detachment movement is surely prevented in cooperation with the first detachment prevention part and the second detachment prevention part to prevent fluid leakage. can do. Moreover, the bent state of the insertion port and the pipe support portion on one end side of the joint ring in the detached state is maintained within an appropriate range, and fluid leakage due to a local deterioration of the seal portion in the circumferential direction is prevented. It can be suppressed.

The second characteristic configuration of the present invention is that the tilt regulating portion is externally attached to the insertion port in a state in which the receiving port and the insertion port are fitted and connected to each other and in a detached state, and tilts in the detached state. A point is that a tilt restricting body having a split structure having a tilt regulating surface capable of contacting the outer surface of the insertion port and a fixed connecting portion for fixing and connecting the tilt regulating body to the receiving port are provided. ..

According to the above configuration, in a state where the socket and the insertion port are fitted and connected, the tilt regulation body having a split structure of the tilt regulation portion is attached to the insertion port, and the tilt regulation body is used as the socket at the fixed connection portion. Fixed connection. Even when the socket and the insertion port move relative to each other to the detached state due to an earthquake or uneven subsidence, the tilt control body is maintained in the state of being externally attached to the insertion port. Therefore, when a bending force due to an earthquake or an unequal force due to fluid pressure acts in the detached state, the tilt regulating surface of the tilt regulating body fixedly connected to the receiving port and the outer surface of the insertion port come into contact with each other. .. As a result, the bent state of the insertion port and the pipe support portion on one end side of the joint ring in the detached state is surely maintained within an appropriate range, and the fluid caused by the local deterioration of the seal portion in the circumferential direction of the seal portion. Leakage can be suppressed.

The third characteristic configuration of the present invention is that the tilt regulating body is provided with a tilt regulating protrusion that abuts on the inner surface of the joint ring as the insertion port tilts in the detached state.

According to the above configuration, when a bending force due to an earthquake or an unequal force due to fluid pressure acts in the detached state, the tilt regulating surface of the tilt regulating body fixedly connected to the socket and the outer surface of the insertion port And the tilt control protrusion of the tilt control body come into contact with the inner surface of the joint ring. Due to the contact between the inner side and the outer side in the radial direction of the pipe, the bent state between the insertion port and the pipe support portion on one end side of the joint ring in the detached state can be surely maintained within an appropriate range. It is possible to suppress the leakage of fluid due to the local deterioration of the seal in the circumferential direction of the seal portion.

The fourth characteristic configuration of the present invention is that the tilt regulating protrusion is configured so that the contact position of the joint ring with respect to the inner surface can be changed in the pipe radial direction.

According to the above configuration, when the tilt restricting body having the split structure of the tilt regulating portion is attached to the insertion port, there is a site where the receiving port and the insertion port are bent at the fitting connection portion. Even in this case, the contact position of the tilt-regulating protrusion can be changed in the pipe radial direction according to the measured distance between the protrusion-forming portion of the tilt-regulating body and the protrusion-contacting portion on the inner peripheral surface of the joint ring. it can. As a result, even in the field where the receiving port and the insertion port are bent at the fitting connection portion, the exterior assembly work of the tilt regulating portion with respect to the insertion port can be efficiently and surely performed. Moreover, when a bending force due to an earthquake, an unequal force due to fluid pressure, or the like acts in the detached state, the tilt regulating protrusion of the tilt regulating body can be accurately brought into contact with the inner surface of the joint ring.

In the fifth characteristic configuration of the present invention, the fitting connection portion is movable to the insertion port and a sealing material mounted between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the socket. The seal member is provided with a push ring provided with a pressing portion capable of pressing the seal member from the tube axis direction, and a fastener for tightening and fixing the receiving port and the push ring from the tube axis direction. The fixed connecting portion of the tilt regulating portion is formed by the fastener of the fitting connecting portion.

According to the above configuration, when the socket and the push ring are tightened and fixed from the direction of the tube axis with the fastener, the sealing material attached between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the socket is formed. , It is compressed in a sealed state by the pressing part of the push ring. By using the fastener for the push ring for sealing the fitting connection portion, the fixed connecting portion of the tilt regulating portion can be securely and firmly fixedly connected to the receiving port.

The sixth characteristic configuration of the present invention is that the fitting connection portion is fitted and connected to the receiving port in a seal holding groove formed on the inner peripheral surface of the receiving port and opened inward in the radial direction. The fixed connecting portion of the tilt restricting portion is configured by mounting a seal member that is compressed in a watertight state with the outer peripheral surface of the receiving port, with respect to an annular protrusion formed at an end portion of the outer peripheral surface of the receiving port. In a state where the engaging projection provided on the tilt restricting body and the engaging projection of the tilt regulating body are engaged with the annular projection of the receiving port in a state where they can be engaged from the outside in the radial direction of the pipe. The point is that it is composed of a fastener for tightening and fixing the split tilt regulating members of the tilt regulating body to the insertion slot in a holding state.

According to the above configuration, when the socket and the socket are fitted and connected, the seal member mounted on the seal holding groove on the inner peripheral surface of the socket is compressed into a sealed state on the outer peripheral surface of the socket. Using the annular projection formed at the end of the outer peripheral surface of the receiving port that constitutes this fitting connection portion, the engaging projection provided on the tilt restricting body is outside the pipe radial direction with respect to the annular projection of the receiving port. Engage from the side. In this engaged state, by tightening and fixing the split tilt regulating members of the tilt regulating body with fasteners, the fixed connecting portion of the tilt regulating portion can be securely and firmly fixedly connected to the receiving port.

Perspective view which shows 1st Embodiment of the detachment prevention structure of a pipe connection part Overall cross-sectional view at the time of assembly Overall sectional view at the time of withdrawal Overall cross-sectional view showing bending regulation operation in the detached state Split joint wheel case inner view Front view of the tilt control unit of the first embodiment Front view of a main part showing another connection structure of the tilt control part of the first embodiment Front view of the tilt control unit of the second embodiment Overall sectional view at the time of assembly showing the second embodiment of the disconnection prevention structure of the pipe connection portion. Overall vertical cross-sectional view at the time of withdrawal Overall sectional view at the time of assembly showing the third embodiment of the disconnection prevention structure of the pipe connection portion. Overall sectional view at the time of withdrawal Front view of the tilt control unit of the third embodiment

Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 4 show a disconnection prevention structure of a pipe connection portion used in a fluid transportation 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. Has been done. 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.
As shown in FIGS. 2 and 3, the socket 2A and the insertion port 1A are disconnected from each other at the portions of the joint ring 30 and the other fluid pipe 2 on the receiving port 2A side facing each other in the pipe axis direction. A first detachment blocking unit 4 is provided, which allows the relative detachment movement to the detached state and prevents the relative detachment movement of the receiving port 2A and the joint ring 30 in the detached state from contacting with each other.
As shown in FIGS. 2 and 3, the insertion port 1A of the fluid pipe 1 is provided with a second detachment prevention portion 5 having a divided structure. The second detachment preventing portion 5 is a connecting portion 52 fixedly connected to the pipe support portion 30d on one end side in the pipe axis direction of the joint ring 30, and an insertion port 1A for the pipe support portion 30d on one end side of the joint ring 30. The retaining portion 55 is provided so that the retaining resistance with the outer peripheral surface 1a of the insertion port 1A increases with the detachment movement of the insertion port 1A.
In the joint ring 30, a tilt regulating portion 9 for restricting the tilt of the insertion port 1A with respect to the pipe support portion 30d on one end side of the joint ring 30 is provided in a detached state in which the receiving port 2A and the insertion port 1A are disconnected. Has been done.

In the above-mentioned detachment prevention structure of the pipe connecting portion, the fluid pipes 1 and 2 have been mentioned as an example of the pipe portion, but there have been various types of pipe portions conventionally. For example, although not shown, it constitutes a branch pipe portion of a split T-shaped pipe whose exterior is fixed to the fluid pipe in a sealed state, a branch pipe portion integrally protruding from the fluid pipe, and a part of fluid equipment. The pipe 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. 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 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 seal 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 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 piped by a first fastener 25 such as a plurality of metal T-head bolts 23 and nuts 24 arranged at predetermined intervals in the pipe circumferential direction. It is tightened and connected from the axis direction. By the tightening connection by the first fastener 25, the first sealing member 21 is compressed into a sealed state (watertight state) by the pressing portion 22a of the push ring 22 which is attracted and fixed to the flange portion 2b of the receiving port 2A, and the sealed state is changed. Be maintained.

As shown in FIGS. 1 to 5, 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. As shown in FIGS. 2 and 5, the two split joint wheel cases 30A and 30B are configured to have the same shape.
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 integrally extending inward in the radial direction from both ends of the peripheral wall portion 30a in the pipe axis direction. The main configurations are 30b and 30c, and cylindrical pipe support portions 30d and 30e extending outward from the inner diameter side ends of the side wall portions 30b and 30c along the pipe axis direction. Has been done. The side wall portion 30b on one end side on the insertion port 1A side is formed as a vertical side wall portion orthogonal to or substantially orthogonal to the tube axis. The side wall portion 30c on the other end side, which is on the receiving port 2A side, is configured as a tapered side wall portion having a smaller diameter toward the pipe support portion 30e side continuous with the side wall portion 30c.

As shown in FIGS. 1 and 5, connecting flange portions 30C projecting outward in the horizontal direction are integrally formed at both ends of the joint ring 30 divided joint ring cases 30A and 30B in the pipe circumferential direction. ing. The connecting flange portions 30C of the two split joint wheel cases 30A and 30B are fixedly connected to each other in a sealed state (watertight state) by tightening the second fastener 34 such as the bolt 31 and the nut 32. As shown in FIG. 2, the two split joint ring cases 30A and 30B have the outer peripheral surfaces 1a of both fluid pipes 1 and 2 including the inner peripheral surface 30f (see FIG. 2) of the joint ring 30 and the fitting connection portion 20. A seal portion 35 (see FIG. 2) is provided to seal the surrounding space 33 formed between the 2c and the outside with respect to the outside.

As shown in FIGS. 2 and 3, the seal portion 35 is provided with a second seal member 37 such as an annular gasket in the annular seal holding grooves 36 formed in each of the two split joint ring cases 30A and 30B. It is composed of.
As shown in FIG. 5, the seal holding groove 36 includes a first circumferential groove 36a formed on the inner surface of the pipe support portion 30d facing the semi-peripheral surface of the insertion port 1A and the receiving port 2A. Two second circumferential groove 36b and first and second circumferential groove 36a, which are formed on the inner surface of the pipe support portion 30e facing the semi-peripheral surface at intervals in the pipe axis direction. A pipe axial groove portion 36c formed along a dividing surface of both connecting flange portions 30C in a state of communicating with the circumferential end portion of the 36b is provided.
As shown in FIGS. 2 and 3, the second seal member 37 has a first circumferential seal portion 37a attached to the first circumferential groove 36a and a second seal member 37 attached to the second circumferential groove 36b of the two articles. The circumferential seal portion 37b and the tubular axial seal portion (not shown) mounted on the tubular axial groove portion 36c are integrally molded.
Then, the pipe axial direction seal portions of both second seal members 37 come into contact with each other in a sealed state (watertight state) from the pipe radial direction between the divided surfaces of both connecting flange portions 30C. The first circumferential seal portion 37a and the second circumferential seal portion 37b of both second seal members 37 are formed on the outer peripheral surfaces 1a and 2c of both fluid pipes 1 and 2 at both pipe support portions 30d and 30e of the joint ring 30. Contact in a sealed state along the circumferential direction of the tube.

As shown in FIGS. 2 and 5, the first detachment preventing portion 4 is the inner peripheral surface 30f between the pipe support portions 30d and 30e of the split joint ring cases 30A and 30B, and is in the direction other than the pipe axis direction. A semi-circular ring projecting inward in the pipe radial direction from the pipe axis direction to a position where it can abut the head 23A of the plurality of T-head bolts 23 of the first fastener 25 at the portion displaced toward the end side. The detachment prevention wall portion 41 is integrally formed. In the present embodiment, the detachment prevention wall portion 41 is formed at the boundary portion between the peripheral wall portion 30a and the tapered side wall portion 30c on the inner peripheral surfaces 30f of the two split joint ring cases 30A and 30B.
Of the side surfaces of the detachment prevention wall portion 41, the side surfaces of the head 23A of the plurality of T-head bolts 23 facing each other in the pipe axis direction are in a detached state due to the contact with the head 23A of the T-head bolt 23. It is configured on the contact surface 41a that prevents the relative detachment movement of the receiving port 2A and the joint ring 30 from contacting each other.
A plurality of metal T-head bolts 23 arranged at predetermined intervals in the circumferential direction of the pipe are also configured as a contact member 45 fixed to the receiving port 2A side, and the head 23A of each T-head bolt 23 is configured. The contact surface 23a, which is a flat top surface, is formed on the contact surface 45a of the contact member 45.
Each of the contact surface 41a of the detachment prevention wall portion 41 and the contact surface 45a of the contact member 45 composed of the contact surface 23a of the head portion 23A of each T-head bolt 23 is orthogonal to the pipe axis. It is formed on the orthogonal planes.

Then, when a detaching force due to an earthquake, immovable 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, as shown in FIG. The contact member 45 is composed of the contact surface 41a of the detachment prevention wall 41 in the joint ring 30 and the contact surface 23a of the head 23A of each T-head bolt 23 fixed to the receiving port 2A side. The contact surface 45a comes into contact with the contact surface 45a from the direction of the tube axis, and the further detachment movement between the receiving port 2A of the fluid tube 2 and the joint ring 30 is prevented. At this time, since the contact surface 41a of the detachment prevention wall portion 41 in the joint ring 30 and the contact surface 45a of the contact member 45 are formed on orthogonal surfaces orthogonal to the pipe axis, the detachment prevention wall The contact surface 41a of the portion 41 and the contact surface 45a of the contact member 45 are in a surface contact state along the orthogonal direction. As a result, the withdrawal force can be reliably received and the withdrawal prevention effect can be improved. Further, since the push-opening force of the split joints acting on the split joints 30A and 30B of the joint rings 30 is not generated at the time of contact, the sealing performance of the split joints 30A and 30B is reduced. It can be suppressed.

In the present embodiment, as shown in FIG. 2, the initial assembly state is a state in which 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. Become. Further, as shown in FIG. 3, the state in which the contact surface 23a of the head 23A of the T-head bolt 23 is in contact with the contact surface 41a of the detachment prevention wall portion 41 in the joint ring 30 is the maximum detachment movement state. Become.
As a result, as shown in FIG. 2, the distance from the contact surface 23a of the head 23A of the T-head bolt 23 to the contact surface 41a of the detachment prevention wall portion 41 in the initial assembly state becomes the maximum detachment movement distance L. In the maximum detachment moving state, as shown in FIG. 3, the connection between the insertion port 1A of one fluid tube 1 and the receiving port 2A of the other fluid tube 2 is released.

As shown in FIGS. 1 and 2, the second detachment prevention portion 5 is composed of a seismic retrofitting metal fitting 50 having a divided structure. The seismic retrofitting metal fitting 50 is divided into two in the pipe circumferential direction, and a pair of metal split holding members 51 that are detachably held and fixed to the insertion port 1A of one of the fluid pipes 1 from the pipe radial direction. Is provided. The pair of split holding members 51 is inserted into the fluid pipe 1 by tightening and connecting the flange portions 51A provided at both ends in the pipe circumferential direction with a third fastener 47 such as a bolt 48 and a nut 49. It is firmly sandwiched and fixed to the mouth 1A.

The connecting portion 52 of the seismic reinforcing metal fitting 50 has an annular engaging projection 53 protruding from the outer peripheral surface of the pipe supporting portion 30d on one end side of the joint ring 30, and the engaging projection 53 outside the pipe radial direction. It includes an engaging recess 54 that can be engaged and disengaged from the side. Among them, the engaging recess 54 is formed with an opening inward in the pipe radial direction at a portion of each divided holding member 51 that integrally projects from the middle portion in the pipe circumferential direction along the pipe axis direction.
When the seismic retrofitting metal fitting 50 is attached to the insertion port 1A of the fluid pipe 1, as shown in FIGS. 1 and 2, the engaging recess 54 integrally formed in the two split holding members 51 is formed at one end of the joint ring 30. The engagement protrusion 53 of the pipe support portion 30d on the side is engaged 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 engaged with each other with the bolt 48 and the nut 49 of the third fastener 47. Tighten and connect with.

As shown in FIG. 1, gap regulation bolts 58 that come into contact with the outer peripheral surface 1a of the insertion port 1A from the pipe radial direction are screwed into a plurality of pipe support portions 30d on one end side of the joint ring 30 in the pipe circumferential direction. There is. By the screwing operation of the plurality of gap regulation bolts 58, the annular gap between the inner peripheral surface of the pipe support portion 30d on one end side and the outer peripheral surface 1a of the insertion port 1A is constantly regulated.
Then, when a strong disengagement force due to an earthquake or uneven settlement acts, the engaging recess 54 of the seismic retrofitting metal fitting 50 and the engaging projection 53 of the pipe support portion 30d on one end side of the joint ring 30 are in the direction of the pipe axis. Engage from. When a stronger force is applied in the disengagement direction in this engaged state, the pipe support portion 30d on one end side of the joint ring 30 is deformed to the pipe axis side, and the engagement recess 54 of the seismic retrofitting metal fitting 50 and the joint ring 30 There is a possibility that the engagement projection 53 will be disengaged. However, in the present embodiment, it is possible to prevent the pipe support portion 30d on one end side of the joint ring 30 from being deformed toward the pipe axis side by the plurality of gap regulation bolts 58, and the engaging recess of the seismic retrofitting metal fitting 50. The engaged state between the 54 and the engaging projection 53 of the joint ring 30 can be strongly maintained.

As shown in FIGS. 2 and 5, the retaining portion 55 of the seismic reinforcing metal fitting 50 includes a claw storage portion 56 formed on the inner peripheral surface of the two-split holding member 51 and opening inward in the radial direction, and the claw. A claw member 57 that is movably accommodated inward in the pipe radial direction is provided in the accommodating portion 56. 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 formed on an inclined surface that bites and moves the claw member 57 inward in the radial direction with the relative detachment movement in the direction of the tube axis.

Then, when a detaching force due to an earthquake, uneven settlement, 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 one fluid pipe 1 Between the insertion port 1A and the joint ring 30, the connecting portion 52 of the seismic retrofitting 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. The connection between the joint ring 30 and the seismic retrofitting metal fitting 50 is firmly maintained. 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 detaches from 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 fixedly connected via the seismic retrofitting metal fitting 50.
As a result, as shown in FIG. 3, 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 the joint ring 30 It is possible to firmly prevent the insertion port 1A from moving out of the pipe support portion 30d on one end side.
Moreover, the pipe support portion 30d on one end side of the joint ring 30 and the retaining portion 55 of the seismic retrofitting metal fitting 50 support two locations at the insertion port 1A of the fluid pipe 1 at intervals in the pipe axis direction. As shown in 3, when the insertion port 1A and the receiving port 2A are disconnected from each other, the 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 shown in FIGS. 2 and 3, the tilt regulating unit 9 is inserted in a state in which the insertion port 1A of one fluid pipe 1 and the receiving port 2A of the other fluid pipe 2 are fitted and connected to each other and in a detached state. A tilt restricting body 90 externally attached to 1A and a fixed connecting portion 91 for fixing and connecting the tilt regulating body 90 to the receiving port 2A are provided. The tilt restricting body 90 is integrally formed with a tilt regulating cylinder 90b having an inner diameter slightly larger than the outer diameter of the insertion port 1A, and a tilt regulating cylinder 90b radially outward from the outer peripheral surface of the tilt regulating cylinder 90b. It has a connecting flange portion 90c that projects in a symmetrical manner.
As shown in FIG. 3, the tilt regulating surface 90a of the tilt restricting body 90 has an insertion port 1A with respect to the pipe support portion 30d on one end side of the joint ring 30 in a detached state in which the insertion port 1A and the receiving port 2A are disconnected. At the time of tilting, it contacts the outer surface of the end portion of the insertion port 1A to regulate further tilting.

As shown in FIG. 6, the tilt restricting body 90 is divided into two in the circumferential direction of the pipe, and is detachably attached to the insertion port 1A from the radial direction of the pipe. It is composed of regulating members 90A and 90B. The pair of split tilt regulating members 90A and 90B are inserted by tightening and connecting the connecting pieces 90d provided at both ends in the pipe circumferential direction with a fourth fastener 92 such as a bolt 93 and a nut 94. It is formed in an annular shape along the outer peripheral surface 1a of 1A.

As shown in FIGS. 2 and 6, the connecting flange portions 90c of the split tilt regulating members 90A and 90B are on one end side of the joint ring 30 in a detached state in which the insertion port 1A and the receiving port 2A are disconnected. A tilt regulating protrusion 95 is provided to regulate further tilting of the insertion port 1A by abutting on the inner surface of the joint ring 30 as the insertion port 1A tilts with respect to the pipe support portion 30d. The tilt restricting protrusion 95 is provided at one or a plurality of connecting flange portions 90c. In the present embodiment, the tilt regulating protrusion 95 is formed so as to protrude outward in the pipe radial direction from two locations in the circumferential direction of each connecting flange portion 90c.

As shown in FIG. 2, the tilt regulating tube 90b of the split tilt regulating members 90A and 90B has a taper formed between the tapered inner peripheral surface 22c of the push ring 22 and the outer peripheral surface 1a of the insertion port 1A. An engaging protrusion 90e that engages with the shape gap from the direction of the tube axis is projected. As shown in FIG. 3, the engaging protrusions 90e of the two split tilt regulating members 90A and 90B have a tapered inner peripheral surface 22c of the push ring 22 even when the insertion port 1A and the receiving port 2A are disconnected from each other. Engagement with is maintained. By engaging the engaging protrusions 90e of the two split tilt regulating members 90A and 90B in this detached state with the tapered inner peripheral surface 22c of the push ring 22, the insertion port 1A with respect to the pipe support portion 30d on one end side of the joint ring 30. Tilt is regulated.

As shown in FIGS. 2 and 6, the fixed connecting portion 91 of the tilt regulating portion 9 is composed of the first fastener 25 of the fitting connecting portion 20. Specifically, a bolt insertion hole through which the tip of the T-head bolt 23 can be inserted into a portion of the connecting flange portion 90c of the two split tilt regulating members 90A and 90B corresponding to each T-head bolt 23 of the first fastener 25. Form 91a. A fixed connecting nut 91b is screwed into the tip of the T-head bolt 23 into which the bolt insertion holes 91a of the split tilt regulating members 90A and 90B are inserted. By tightening the fixed connecting nut 91b, the tilt restricting body 90 is fixedly connected to the receiving port 2A.

Then, as shown in FIG. 3, in the detached state in which the insertion port 1A and the receiving port 2A are disconnected, a bending force due to an earthquake, an averaging force due to fluid pressure, or the like acts, and as shown in FIG. In addition, the insertion port 1A may tilt with respect to the pipe support portion 30d on one end side of the joint ring 30. At this time, the outer surface of the end portion of the insertion port 1A abuts on the tilt control surface 90a of the tilt control body 90, and a part of the tilt control protrusion 95 of the tilt control body 90 abuts on the inner surface of the joint ring 30. As a result, the bent state of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30 in the detached state is maintained within an appropriate range, and the sealing performance of the sealing portion 35 in the circumferential direction is reduced. The resulting fluid leakage can be suppressed.

In the first detachment prevention portion 4 of the first embodiment described above, the contact surface 41a of the detachment prevention wall portion 41 provided in the joint ring 30 and each T-head bolt 23 fixed to the receiving port 2A side. It is configured to prevent the socket 2A and the joint ring 30 from moving apart by contacting with the head 23A. However, the configuration is not limited to this. For example, in the case of the joint ring 30 in which the detachment prevention wall portion 41 is not provided, the first detachment prevention portion 4 will be described with reference to FIGS. 2 and 3, both pipe support portions 30d and 30e of the joint ring 30. On the other end side of the inner surface between the pipe shafts in the direction of the pipe shaft core, in other words, on the side wall portion 30c on the other end side of the joint ring 30, from the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A and the pipe shaft core direction. A thick-walled detachment prevention portion 42 that can be contacted is formed. The contact surface 42a of the detachment prevention portion 42 is formed in a tapered shape having the same slope as the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A.

In the first detachment prevention portion 4 described above, when a detachment 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, the side wall on the other end side of the joint ring 30. The contact surface 42a of the detachment blocking portion 42 formed in the portion 30c and the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A can come into contact with each other to prevent further detachment movement of both. At this time, since the contact surface 42a of the detachment prevention portion 42 is formed in a tapered shape having the same slope as the tapered outer peripheral surface portion 2e on the outer peripheral surface 2c of the receiving port 2A, the contact surface 42a of the detachment prevention portion 42a. And the tapered outer peripheral surface portion 2e of the receiving port 2A come into contact with each other in a surface contact state, and the detachment movement of the receiving port 2A and the joint ring 30 can be strongly prevented.
Moreover, when the contact surface 42a of the detachment blocking portion 42 abuts on the tapered outer peripheral surface portion 2e of the receiving port 2A, a force is generated to push open the divided surface of the joint ring 30 of the divided structure. However, in the present invention, the contact surface 42a of the detachment preventing portion 42 is formed on the other end side of the joint ring 30 between the two pipe support portions 30d and 30e in the pipe axis direction, so that both pipe support portions 30d. , The push-opening force becomes smaller by the deviation allowance at which the contact surface 42a of the detachment blocking portion 42 deviates from 30e, and fluid leakage occurs due to a decrease in the sealing property of the seal portion 35 due to the push-opening of the split surface of the joint ring 30. Can be suppressed.

[Another connection structure of the tilt control body 90 of the first embodiment]
In the above-described first embodiment, as shown in FIG. 6, as a first embodiment of the tilt regulating body 90, the connecting pieces 90d provided at both ends of the split tilt regulating members 90A and 90B in the circumferential direction are bolted to each other. It was connected by a fourth fastener 92 such as 93 and a nut 94. Instead of the connection structure of the tilt restrictor 90, another connection structure shown in FIG. 7 may be adopted. In this other connection structure, a second connecting piece 90f that can be polymerized and arranged from the pipe radial direction is integrally formed at each of both ends of the split tilt regulating members 90A and 90B in the pipe circumferential direction. A second bolt insertion hole 91c through which the tip of the T-head bolt 23 can be inserted is formed in the second connecting piece 90f of each set to be polymerized. As a result, the two split tilt regulating members 90A and 90B can be connected in an annular shape by using the T-head bolt 23 and the fixed connecting nut 91b constituting the fixed connecting portion 91 of the tilt regulating portion 9.

[Second Example of Tilt Regulator 90]
In the second embodiment of the tilt regulating body 90 shown in FIG. 8, the tilt regulating protrusion 95 is configured so that the contact position with respect to the inner surface of the joint ring 30 can be changed in the pipe radial direction. Specifically, the tilt regulating protrusion 95 is screwed into the female screw portion 95A formed at two locations in the circumferential direction of each of the split tilt regulating members 90A and 90B, and the female screw portion 95A from the pipe radial direction. It includes a tilt control bolt 95B and a lock nut 95C for fixing the tilt control bolt 95B whose contact position in the pipe radial direction is adjusted. By screwing the tilt control bolt 95B, the contact position of the joint ring 30 with respect to the inner surface is changed in the pipe radial direction.

Then, when the tilt restricting body 90 having the split structure of the tilt regulating portion 9 is exteriorized to the insertion port 1A, there is a site where the receiving port 2A and the insertion port 1A are bent at the fitting connection portion 20. Even in this case, the contact position of the tilt control bolt 95B is set to the pipe diameter according to the measured distance between the tip of the tilt control bolt 95B of the tilt control body 90 and the protrusion contact portion on the inner peripheral surface 30f of the joint ring 30. Can be changed in direction. As a result, even in the field where the receiving port 2A and the insertion port 1A are bent at the fitting connection portion 20, the exterior assembly work of the tilt regulating unit 9 with respect to the insertion port 1A can be efficiently and reliably performed. .. Moreover, when a bending force due to an earthquake, an unequal force due to fluid pressure, or the like acts in the detached state, the tilt regulating bolt 95B of the tilt regulating body 90 can be accurately brought into contact with the inner surface of the joint ring 30. ..

[Second Embodiment]
In the second embodiment of the disconnection prevention structure of the pipe connecting portion shown in FIGS. 9 and 10, the tilt regulating protrusion 95 of the tilt regulating body 90 described in the first embodiment described above is omitted. Therefore, as shown in FIG. 10, in the disconnected state in which the insertion port 1A and the receiving port 2A are disconnected, a bending force due to an earthquake, an averaging force due to fluid pressure, or the like acts, and one end of the joint ring 30 is formed. The insertion port 1A tilts with respect to the pipe support portion 30d on the side. At this time, the outer surface of the end portion of the insertion port 1A comes into contact with the tilt regulating surface 90a of the tilt regulating body 90. As a result, the bent state of the insertion port 1A and the pipe support portion 30d on one end side of the joint ring 30 in the detached state is maintained within an appropriate range, which is caused by the local deterioration of the sealing performance of the sealing portion 35 in the circumferential direction. Leakage of fluid can be suppressed.
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 third embodiment of the disconnection prevention structure of the pipe connecting portion shown in FIGS. 11 to 13, 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 T-shaped. It is composed of mechanical joints of. In this T-shaped mechanical joint, the outer peripheral surface 1a of the insertion port 1A is fitted and connected to the receiving port 2A in the annular seal holding groove 60 formed on the inner peripheral surface of the receiving port 2A and opening inward in the radial direction. A third seal member 61 such as a rubber ring that is compressed into a sealed state (watertight state) is attached to the surface.

In the joint ring 30 having a split structure that surrounds the fitting connection portion 20 in a sealed state, the connection with the receiving port 2A and the insertion port 1A is disconnected from the pipe support portion 30d on one end side of the joint ring 30. A tilt regulating unit 9 for regulating the tilt of the insertion port 1A is provided.
As shown in FIGS. 11 and 12, the tilt regulating unit 9 is inserted in a state in which the insertion port 1A of one fluid tube 1 and the receiving port 2A of the other fluid tube 2 are fitted and connected and in a detached state. A tilt restricting body 90 externally attached to 1A and a fixed connecting portion 91 for fixing and connecting the tilt regulating body 90 to the receiving port 2A are provided. The tilt control body 90 has a tilt control surface 90a having an inner diameter slightly larger than the outer diameter of the insertion port 1A. As shown in FIG. 12, the tilt regulating surface 90a is in a detached state in which the insertion port 1A and the receiving port 2A are disconnected, and when the insertion port 1A is tilted with respect to the pipe support portion 30d on one end side of the joint ring 30. It abuts on the outer surface of the end of the insertion slot 1A to regulate further tilting.

As shown in FIG. 13, the tilt restrictor 90 is divided into two in the circumferential direction of the pipe, and is detachably attached to the insertion port 1A from the radial direction of the pipe. The split tilt regulating members 90C and 90D are provided. The pair of second split tilt regulating members 90C and 90D are connected by tightening 90 g of the third connecting pieces provided at both ends in the pipe circumferential direction with a fourth fastener 92 such as a T-head bolt 93A and a nut 94. By doing so, it is formed in an annular shape along the outer peripheral surface 1a of the insertion port 1A.

As shown in FIGS. 11 and 13, both the second split tilt regulating members 90C and 90D have a pipe support portion on one end side of the joint ring 30 in a detached state in which the insertion port 1A and the receiving port 2A are disconnected. A tilt regulating protrusion 95 is provided to regulate the further tilt of the insertion port 1A by abutting against the inner surface of the joint ring 30 as the insertion port 1A tilts with respect to 30d. The tilt regulating protrusions 95 are provided at one or more locations of the divided tilt regulating members 90A and 90B. In the present embodiment, the tilt regulating protrusion 95 is formed so as to protrude outward from two locations in the circumferential direction of the divided tilt regulating members 90A and 90B along the pipe radial direction.

The tilt control protrusion 95 is configured so that the contact position of the joint ring 30 with respect to the inner surface can be changed in the pipe radial direction. Specifically, the tilt regulating protrusion 95 is screwed into the female screw portion 95A formed at two locations in the circumferential direction of each of the split tilt regulating members 90A and 90B, and the female screw portion 95A from the pipe radial direction. It includes a tilt control bolt 95B and a lock nut 95C for fixing the tilt control bolt 95B whose contact position in the pipe radial direction is adjusted. By screwing the tilt control bolt 95B, the contact position of the joint ring 30 with respect to the inner surface is changed in the pipe radial direction.

The fixed connecting portion 91 is provided on the tilt restricting body 90 in a state where it can be engaged and disengaged from the outside in the pipe radial direction with respect to the annular protrusion 2g formed at the end of the outer peripheral surface 2c of the receiving port 2A. With the 91d and the second engaging projection 91d of the tilt regulating body 90 engaged with the annular projection 2g of the receiving port 2A, the third connecting pieces 90g of the second split tilt regulating members 90C and 90D are inserted into the insertion port 1A. It is composed of a fourth fastener 92 that is tightened and fixed in a holding state.

As shown in FIGS. 11 and 12, the socket 2A and the insertion port 1A are disconnected from each other at the portions of the joint ring 30 and the other fluid pipe 2 on the receiving port 2A side facing each other in the pipe axis direction. A first detachment blocking unit 4 is provided, which allows the relative detachment movement to the detached state and prevents the relative detachment movement of the receiving port 2A and the joint ring 30 in the detached state from contacting with each other.
As shown in FIGS. 11 and 12, the first detachment prevention portion 4 is the inner peripheral surface 30f between the pipe support portions 30d and 30e of the two split joint ring cases 30A and 30B, and is in the direction other than the pipe axis direction. Inwardly in the pipe radial direction from the pipe axis direction to a position where contact is possible with the contact portion 90h formed on the other end side of both second split tilt regulating members 90C and 90D at the portion displaced toward the end side. A protruding semicircular ring-shaped detachment prevention wall portion 41 is integrally formed. In the present embodiment, the detachment prevention wall portion 41 is formed at the boundary portion between the peripheral wall portion 30a and the tapered side wall portion 30c on the inner peripheral surfaces 30f of the two split joint ring cases 30A and 30B.
Of the side surfaces of the detachment prevention wall portion 41, the side surfaces facing the contact portions 90h of the two second division tilt regulating members 90C and 90D in the direction of the pipe axis are the hit surfaces of the two second division tilt regulating members 90C and 90D. The contact surface 41a is configured to prevent the relative detachment movement of the receiving port 2A and the joint ring 30 in the detached state by abutting with the contact portion 90h.
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-described first embodiment, the tilt restrictor 90 is tilted by abutting the outer surface of the insertion port 1A that tilts with respect to the pipe support portion 30d on one end side of the joint ring 30. The tilt regulation surface 90a and the inner surface of the joint ring 30 are abutted with the inclination of the insertion port 1A with respect to the pipe support portion 30d on one end side of the joint ring 30, thereby restricting further inclination of the insertion port 1A. A tilt-regulating protrusion 95 and a tilt-regulating protrusion 95 are provided. However, the present invention is not limited to this configuration, and for example, it may be carried out only on one of the tilt regulating surfaces 90a or the tilt regulating protrusion 95.

(2) In the second embodiment of the tilt regulating body 90 described above, the contact position of the joint ring 30 with respect to the inner surface is changed in the pipe radial direction by the screwing operation of the tilt regulating bolt 95B. However, the present invention is not limited to this configuration, and for example, a plurality of tilt regulating protrusions 95 having different lengths in the pipe radial direction may be selectively replaced with respect to the tilt regulating body 90 to tilt. By replacing the regulating protrusion 95, the contact position of the joint ring 30 with respect to the inner surface may be changed in the pipe radial direction.

(3) In the above-described first embodiment, the second detachment prevention portion 5 is composed of the seismic retrofitting metal fitting 50 having a split structure separate from the joint ring 30, but the second detachment prevention portion 5 is formed by the joint ring. It may be assembled to 30 and configured. In this case, the outer peripheral surface of the insertion port 1A is moved to the pipe support portion 30d on the one end side in the pipe axis direction of the joint ring 30 with respect to the pipe support portion 30d on the one end side of the joint ring 30. A retaining portion 55 is provided to increase the retaining resistance between the two.

1 Pipe (fluid pipe)
1A Insertion 1a Outer peripheral surface 2 Second detachment prevention part 2A Receptacle 2a Inner peripheral surface 2c Outer peripheral surface 2e Tapered outer peripheral surface part 2g Circular protrusion 4 First detachment prevention part 5 Second detachment prevention part 9 Tilt restriction part 20 Connection part 21 Seal member (1st seal part)
22 Push ring 22a Pressing part 25 Fastener (first fastener)
30 Joint ring 30d Pipe support 60 Seal holding groove 61 Seal member (third seal member)
90 Tilt control member 90A Split tilt control member 90B Split tilt control member 90C Second split tilt control member 90D Second split tilt control member 90a Tilt control surface 91 Fixed connecting part 91d Engagement protrusion (second engagement protrusion)
92 Fastener (4th fastener)
95 Tilt control protrusion

Claims (6)

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, and the joint ring and the other said. A portion facing the receiving side of the pipe portion in the direction of the tube axis is allowed to move relative to the detached state until the receiving port and the insertion port are disconnected, and in the detached state. A first detachment blocking portion is provided to prevent the relative detachment movement of the joint ring from the receiving port and the joint ring by a certain amount or more, and the pipe support portion side on one end side in the pipe axis direction of the joint ring is the said. A second detachment blocking portion is provided with a retaining portion that increases the retaining resistance with the outer peripheral surface of the insertion opening as the insertion opening moves away, and the joint ring is provided with a retaining portion in the detached state. , A disconnection prevention structure for a pipe connection portion provided with a tilt restricting portion for regulating the tilt of the insertion port with respect to the pipe support portion on one end side of the joint ring. The tilt restricting portion is externally attached to the insertion port in a state in which the receiving port and the insertion port are fitted and connected and in a detached state, and abuts on the outer surface of the insertion opening that tilts in the detached state. The disconnection prevention structure for a pipe connecting portion according to claim 1, wherein a tilting restricting body having a split structure having a possible tilting regulating surface and a fixed connecting portion for fixing and connecting the tilting restricting body to the receiving port are provided. .. The detachment prevention structure for a pipe connection portion according to claim 2, wherein the tilt restricting body is provided with a tilt regulating protrusion that abuts on the inner surface of the joint ring as the insertion port tilts in the detached state. The detachment prevention structure for a pipe connecting portion according to claim 3, wherein the tilting regulating protrusion is configured so that the contact position of the joint ring with respect to the inner surface can be changed in the pipe radial direction. The fitting connection portion includes a sealing material mounted between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the receiving port, and the sealing member that is movably exteriorized by the insertion port. A push ring provided with a pressing portion capable of pressing from the pipe axis direction, and a fastener for tightening and fixing the socket and the push ring from the tube axis direction, and the fixed connecting portion of the tilt regulating portion The structure for preventing disconnection of the pipe connection portion according to any one of claims 2 to 4, which is composed of the fastener of the fitting connection portion. The fitting connection portion is in a watertight state between the seal holding groove formed on the inner peripheral surface of the receiving port and opening inward in the radial direction and the outer peripheral surface of the insertion port fitted and connected to the receiving port. The fixed connecting portion of the tilt restricting portion is configured by mounting a seal member that is compressed into the above, and engages with the annular protrusion formed at the end of the outer peripheral surface of the receiving port from the outside in the pipe radial direction. In a state where the engaging projection provided on the tilt regulating body and the engaging projection of the tilt regulating body are engaged with the annular projection of the receiving port in a possible state, the split tilt regulating members of the tilt regulating body are engaged with each other. The detachment prevention structure for a pipe connecting portion according to any one of claims 2 to 4, which is composed of a fastener for tightening and fixing the pipe to the insertion slot in a holding state.

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