JP7384579B2 - Structure to prevent separation of pipe connections - Google Patents

Description

The present invention provides a pipe in which a joint ring having a split structure that hermetically surrounds a fitting connection between an insertion port of one pipe part and a socket of the other pipe part is sheathed over both said pipe parts. This invention relates to a structure for preventing detachment of a connection part.

As a structure for preventing separation of the above-mentioned pipe connection part, there is a pipe mounting structure shown in Patent Document 1. In this tube mounting structure, the fitting connection portion between the insertion port of one tube portion and the socket of the other tube portion is constituted by a K-shaped mechanical joint. In this mechanical joint, a sealing material such as a rubber ring is installed between the outer peripheral surface of the socket and the tapered inner peripheral surface of the socket. The flange portion of the push ring, which has a pressing portion capable of pressing the sealing material from the direction of the tube axis, and the flange portion of the socket are connected by tightening bolts and nuts. By this tightening connection, the sealing material is compressed into a watertight state by the pressing part of the press ring which is drawn and fixed to the flange part of the socket, and the watertight state is maintained.

In addition, the split ring that seals around the mechanical joint, which is the fitting connection part, has a cylindrical peripheral wall part with a larger diameter than the socket, and a radially inward part from both ends of the peripheral wall part in the tube axis direction. The main components include an annular side wall portion integrally extending from the inside diameter side end portion of each side wall portion and a tube support portion integrally extending outward along the tube axis direction. We are prepared.
A sealing portion is provided on the inner circumferential surface of both tube supporting portions of the joint ring, and a sealing member is installed to seal between the outer circumferential surfaces of both tube portions.

Further, at a portion where the joint ring and the socket side of the other pipe portion face each other in the tube axis direction, there is provided a detachment movement prevention means for abutting and preventing relative disengagement movement of the socket and the joint ring beyond a certain level. It is provided. In the detachment movement prevention means, the inner diameter of the tube support portion on the other end side of the joint ring, which is the socket side, is formed to be smaller than the maximum outer diameter of the tapered portion of the socket. When the insertion port and socket are separated, the tube support portion on the other end side of the joint ring contacts the tapered portion of the socket from the tube axis direction, and is configured to prevent further separation movement. .

In addition, on the outer circumferential surface of the socket located in the joint ring, a detachment restriction part of a split structure equipped with a locking member that bites into the outer circumferential surface is clamped and fixed, and the outer diameter of this withdrawal restriction part is set to the side of the socket. It is formed to have a larger inner diameter than the inner diameter of the pipe support part on one end of the coupling ring, and when the insertion port and the socket are separated, the detachment regulating part that is clamped and fixed to the socket will prevent the pipe on the one end side of the coupling ring. It is configured to abut against the support part from the tube axis direction and prevent further detachment movement.

Japanese Patent Application Publication No. 2016-138637

In the tube mounting structure shown in Patent Document 1, when the insertion port and the socket are separated from each other, the removal regulating portion that is clamped and fixed to the insertion port simply contacts the tube support portion on one end side of the joint ring from the direction of the tube axis. , and does not have the function of restricting bending between the insertion port and the tube support portion on one end side of the joint ring. Therefore, when the socket and socket are separated, the socket and the pipe support on one end of the joint ring are bent significantly, and the seal provided on the inner circumferential surface of the pipe support on one end of the joint ring is bent. There is an inconvenience that the sealing performance in the circumferential direction of the part is locally reduced, and fluid leaks from the region where the sealing property is reduced.

In view of this situation, the main object of the present invention is to reliably prevent the detachment movement of the insertion port and socket from the connecting ring while improving the ability to absorb detachment forces, and to Provided is a separation prevention structure for a pipe connection part that can suppress fluid leakage caused by localized deterioration of sealing in the circumferential direction of the seal part by maintaining the bending state with the pipe support part in an appropriate range. It is in the point of doing.

A first characteristic configuration of the present invention is that a joint ring having a split structure that sealingly surrounds a fitting connection portion between an insertion port of one tube portion and a socket of the other tube portion extends over both the tube portions. The connecting ring and the socket side of the other pipe section are provided with a relative disengagement movement to a disengaged state in which the socket and the insertion port are disconnected from each other in a portion facing each other in the tube axis direction. A first detachment prevention portion is provided that allows and prevents relative detachment movement of the socket and the coupling ring by a certain amount or more in the disengaged state, and is provided on one end side of the coupling ring in the tube axis direction. A second detachment preventing portion is provided on the pipe support portion side of the joint, and includes a retaining portion that increases resistance against detachment from the outer circumferential surface of the insertion port as the insertion port moves away from the joint. The ring is provided with a tilting restriction portion that restricts the tilting movement of the insertion port relative to the tube support portion at one end of the joint ring in the disengaged state.

According to the above configuration, the first detachment prevention portion provided at the portion facing each other in the tube axis direction between the connecting ring and the socket side of the other pipe portion prevents the fitting connection between the socket and the socket. When a detachment force due to an earthquake or uneven settlement is applied, relative detachment movement is allowed until the socket and the socket are disconnected from each other to a detached state. This makes it possible to absorb a large detachment force that acts on the fitting connection between the insertion port and the socket. Even so, it is possible to reliably prevent the socket from coming into contact with the relative separation movement of the joint ring beyond a certain level in the detached state, so that the socket can be prevented from coming into contact with the pipe support at the other end of the joint ring. There's no getting out of it.

Further, the second detachment preventing portion provided on the tube support portion side at one end in the tube axis direction of the coupling ring is adapted to prevent the second detachment prevention portion from moving as the fitting moves away from the tube support portion at the one end side of the coupling ring. Since the resistance to prevent the removal of the fitting from the outer circumferential surface of the fitting increases, the fitting of one tube part and the tube support part on one end side of the fitting ring are integrated as a whole through the second detachment prevention part. It is firmly fixedly connected to the
As a result, even if the insertion port and the socket are separated, the socket can not be removed from the pipe support part on the other end of the joint ring, and the socket can not be removed from the pipe support part on the one end side of the joint ring. Each can be strongly prevented.

Furthermore, when the insertion port and socket are separated, even if bending force due to an earthquake or uneven force due to fluid pressure acts, the tilting restriction part provided in the joint ring will prevent the joint ring from moving. It is possible to restrict tilting of the insertion port with respect to the tube support portion on the one end side. As a result, the bending state between the insertion port and the tube support part on one end of the joint ring in the detached state is maintained within an appropriate range, and fluid leakage due to localized sealing deterioration in the circumferential direction of the seal part can be prevented. can be suppressed.

Therefore, the ability to absorb the detachment force acting on the fitting connection portion is improved by the relative detachment movement to the disengagement state where the socket and the insertion port are disconnected. However, when the insertion port and the receptacle move to the detached state, further detachment movement is reliably blocked by the cooperation of the first detachment prevention section and the second detachment prevention section, thereby preventing fluid leakage. can do. In addition, the bending state between the insertion port and the tube support part on one end of the joint ring in the detached state is maintained within an appropriate range to prevent fluid leakage caused by local deterioration of sealing in the circumferential direction of the seal part. Can be suppressed.

A second characteristic configuration of the present invention is that the tilting restriction portion is provided with an exterior of the socket in a state in which the receptacle and the insertion port are fitted and connected and in a detached state, and the tilting restriction portion is configured to tilt in the detached state. and a fixed connecting portion that fixedly connects the tilting regulating body to the socket. .

According to the above configuration, in a state where the receptacle and the receptacle are fitted and connected, the tilt restricting body of the split structure of the tilt restricting part is externally attached to the receptacle, and the tilt restricting body is attached to the receptacle with the fixed connection part. Fixed connection. Even when the receptacle and the receptacle move relative to each other to the point where they are separated due to an earthquake, uneven settlement, etc., the tilting regulating body is maintained in a state where the receptacle is covered with the receptacle. Therefore, in the detached state, when bending force due to an earthquake or uneven force due to fluid pressure is applied, the tilt regulating surface of the tilt regulating body fixedly connected to the socket will come into contact with the outer surface of the socket. . As a result, the bending state between the insertion port and the tube support portion on one end of the joint ring in the detached state is reliably maintained within an appropriate range, and fluid leakage caused by localized deterioration of sealing in the circumferential direction of the seal portion is maintained. Leakage can be suppressed.

A third feature of the present invention is that the tilt regulating body is provided with a tilt regulating protrusion that comes into contact with the inner surface of the joint ring as the socket is tilted in the disengaged state.

According to the above configuration, in the detached state, when a bending force due to an earthquake or an unbalanced force due to fluid pressure acts, the tilting regulating surface of the tilting regulating body fixedly connected to the socket and the outer surface of the socket are in contact with each other, and the tilting restriction protrusion of the tilting restriction body is in contact with the inner surface of the joint ring. Due to this contact on the inner and outer sides in the pipe radial direction, the bending state between the insertion port and the pipe support portion on one end side of the coupling ring in the detached state can be reliably maintained within an appropriate range. Fluid leakage caused by local deterioration of sealing in the circumferential direction of the seal portion can be suppressed.

A fourth feature of the present invention is that the tilting restriction protrusion is configured to be able to change the contact position with respect to the inner surface of the joint ring in the pipe diameter direction.

According to the above configuration, when the tilting restricting body of the split structure of the tilting restricting portion is mounted on the receptacle, there are cases where the receptacle and the receptacle are bent at the fitting connection portion. Even in this case, it is possible to change the contact position of the tilt regulating protrusion in the pipe radial direction depending on the actual measured distance between the protrusion forming part of the tilt regulating body and the protrusion abutting part on the inner peripheral surface of the joint ring. can. As a result, even in a field where the receptacle and the receptacle are bent at the fitting connection part, the exterior assembly work of the tilting restriction part to the receptacle can be performed efficiently and reliably. Moreover, when a bending force due to an earthquake or an uneven force due to fluid pressure is applied in the disengaged state, the tilt regulating protrusion of the tilt regulating body can be accurately brought into contact with the inner surface of the joint ring.

A fifth characteristic configuration of the present invention is that the fitting connection portion includes a sealing material installed between an outer peripheral surface of the insertion port and a tapered inner peripheral surface of the socket, and a sealing member that is movable to the insertion port. a press ring which is externally mounted on the housing and is equipped with a pressing part capable of pressing the sealing member from the tube axis direction; and a fastener which tightens and fixes the socket and the press ring from the tube axis direction; The fixed connection portion of the tilting restriction portion is configured with the fastener of the fitting connection portion.

According to the above configuration, when the socket and the press ring are tightened and fixed from the tube axis direction with the fastener, the sealing material installed between the outer circumferential surface of the socket and the tapered inner circumferential surface of the socket is removed. , compressed into a sealed state by the pressing part of the press ring. By using a push ring fastener for sealing this fitting connection part, the fixed connection part of the tilting restriction part can be reliably and firmly fixedly connected to the socket.

A sixth characteristic configuration of the present invention is that the fitting connection portion is formed in a seal retaining groove that opens radially inward and is formed on an inner circumferential surface of the socket, and the socket that is fitted and connected to the socket. The fixed connecting portion of the tilting regulating portion is configured to be attached with a sealing member that is compressed in a watertight state between the outer circumferential surface of the socket and the annular protrusion formed at the end of the outer circumferential surface of the socket. an engaging protrusion provided on the tilting regulating body in a state that allows engagement from the outside in the radial direction of the pipe, and an engaging protrusion of the tilting regulating body that is engaged with the annular protrusion of the socket; The present invention is comprised of a fastener that clamps and fixes the divided tilting regulating members of the tilting regulating body to the receptacle in a sandwiched state.

According to the above configuration, when the socket and the socket are fitted and connected, the seal member installed in 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 protrusion formed at the end of the outer peripheral surface of the socket that constitutes this fitting connection part, the engagement protrusion provided on the tilting regulating body is moved outward in the pipe radial direction relative to the annular protrusion of the socket. engage from both sides. In this engaged state, by tightening and fixing the divided tilting regulating members of the tilting regulating body to each other with a fastener, the fixed connecting portion of the tilting regulating portion can be reliably and firmly fixedly coupled to the socket.

A perspective view showing a first embodiment of a structure for preventing separation of a pipe connection part Overall sectional view when assembled Overall sectional view when detached Overall sectional view showing bending regulation operation in detached state Internal view of split ring case Front view of the tilting restriction section of the first embodiment A front view of the main parts showing another connection structure of the tilt regulating part of the first embodiment Front view of the tilting restriction section of the second embodiment Overall cross-sectional view when assembled showing a second embodiment of the separation prevention structure of the pipe connection part Overall vertical cross-sectional view when detached Overall sectional view when assembled, showing the third embodiment of the separation prevention structure of the pipe connection part Overall sectional view when detached Front view of the tilting restriction section of the third embodiment

Embodiments of the present invention will be described based on the drawings.
[First embodiment]
1 to 4 show a separation prevention structure for a pipe connection used in a fluid transportation piping system. In this pipe connection part separation prevention structure, the insertion port 1A of the fluid pipe 1, which is an example of one pipe part, and the socket 2A of the fluid pipe 2, which is an example of the other pipe part, are connected at the fitting connection part 20. has been done. A joint ring 30 having a split structure and sealingly surrounding the fitting connection portion 20 is externally wrapped over both fluid pipes 1 and 2.
As shown in FIGS. 2 and 3, the socket 2A and the socket 1A are disconnected from each other at a portion where the joint ring 30 and the socket 2A side of the other fluid pipe 2 face each other in the tube axis direction. A first detachment prevention portion 4 is provided that allows relative detachment movement up to the detachment state and prevents the socket 2A and the joint ring 30 from coming into contact with each other more than a certain amount of relative detachment movement in the detachment state.
As shown in FIGS. 2 and 3, the insertion port 1A of one of the fluid pipes 1 is provided with a second detachment preventing portion 5 having a split structure. The second detachment prevention part 5 includes a connecting part 52 fixedly connected to the tube support part 30d on one end side of the joint ring 30 in the tube axis direction, and an insertion port 1A for the pipe support part 30d on the one end side of the joint ring 30. A retaining portion 55 is provided, which increases the retaining resistance between the insertion port 1A and the outer circumferential surface 1a of the insertion port 1A as the retaining member 55 moves away from the socket.
A tilting restriction portion 9 is provided in the joint ring 30 to restrict the tilting of the socket 1A with respect to the tube support portion 30d at one end of the joint ring 30 when the socket 2A and the socket 1A are disconnected from each other. It is being

In the above-described separation prevention structure for a pipe connection part, the fluid pipes 1 and 2 are taken as an example of the pipe part, but there have been various types of pipe parts. For example, although not shown, a branch pipe part of a split T-shaped pipe with a split structure that is externally fixed to a fluid pipe in a sealed state, a branch pipe part formed integrally with the fluid pipe to protrude, and a part of fluid equipment. For example, a tube part etc.
Furthermore, although the fluid pipes 1 and 2 of this embodiment are ductile cast iron pipes that constitute water pipes for transporting water, which is an example of a fluid, other cast iron pipes, steel pipes, etc. can be used. In addition to tap water, examples of the fluid include industrial water and gas.

The fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the socket 2A of the other fluid pipe 2 is constituted by a K-shaped mechanical joint, as shown in FIGS. 1 to 3. In this K-shaped mechanical joint, a first sealing member 21 such as a rubber ring is installed between the outer circumferential surface 1a of the socket 1A and the tapered inner circumferential surface 2a of the socket 2A. A press ring 22 equipped with a pressing portion 22a capable of pressing the first seal member 21 from the tube axis direction is mounted on the insertion opening 1A. The flange portion 22b of the push ring 22 and the flange portion 2b of the socket 2A are connected to the pipe by first fasteners 25 such as a plurality of metal T-head bolts 23 and nuts 24 arranged at predetermined intervals in the pipe circumferential direction. They are tightened and connected from the axial direction. Due to this tightening connection by the first fastener 25, the first seal member 21 is compressed into a sealed state (watertight state) by the pressing part 22a of the press ring 22 which is drawn and fixed to the flange part 2b of the socket 2A, and the sealed state is maintained. maintained.

As shown in FIGS. 1 to 5, the joint ring 30 is made of cast iron and has a two-part structure that can be freely covered over both the fluid pipes 1 and 2 while surrounding the fitting connection part 20 of both the fluid pipes 1 and 2. It is composed of two split joint ring cases 30A and 30B. Both split joint ring cases 30A and 30B are configured to have the same shape, as shown in FIGS. 2 and 5.
The joint ring 30 includes a cylindrical peripheral wall portion 30a having a larger diameter than the socket 2A, and an annular side wall portion integrally extending radially inward from both ends of the peripheral wall portion 30a in the tube axis direction. 30b, 30c, and cylindrical tube supports 30d, 30e integrally extending outward along the tube axis direction from the inner diameter end of each side wall 30b, 30c. It is being The side wall portion 30b on the one end side that is on the side of the insertion port 1A is configured as a vertical side wall portion that is perpendicular or substantially perpendicular to the tube axis. The side wall portion 30c on the other end side, which is the side of the socket 2A, is formed into a tapered side wall portion that becomes smaller in diameter toward the tube support portion 30e that is continuous thereto.

As shown in FIGS. 1 and 5, connecting flange portions 30C that protrude outward in the horizontal direction are integrally formed at both end portions in the circumferential direction of both split joint ring cases 30A and 30B of the joint ring 30. ing. The connecting flange portions 30C of both split joint ring cases 30A and 30B are fixedly connected in a sealed state (watertight state) by tightening a second fastener 34 such as a bolt 31 and a nut 32. As shown in FIG. 2, the split joint ring cases 30A and 30B include an inner peripheral surface 30f of the joint ring 30 (see FIG. 2), an outer peripheral surface 1a of both fluid pipes 1 and 2 including the fitting connection part 20, A sealing portion 35 (see FIG. 2) is provided to seal the surrounding space 33 formed between the cylindrical portion 2c and the cylindrical portion 2c from the outside.

As shown in FIGS. 2 and 3, the seal portion 35 includes a second seal member 37 such as an annular gasket attached to an annular seal holding groove 36 formed in each of the 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 along the tube circumferential direction formed on the inner surface of the tube support portion 30d facing the semi-outer circumferential surface of the socket 1A, and a first circumferential groove 36a of the socket 2A. Two second circumferential grooves 36b along the tube circumferential direction formed at intervals in the tube axis direction on the inner surface of the tube support part 30e facing the semi-outer circumferential surface, first and second circumferential grooves 36a, A tube axial groove portion 36c is formed along the dividing surface of both connecting flange portions 30C so as to communicate with the circumferential end portion of the tube 36b.
As shown in FIGS. 2 and 3, the second seal member 37 includes a first circumferential seal portion 37a that is attached to the first circumferential groove portion 36a, and a second circumferential seal portion 37a that is attached to the two-striped second circumferential groove portion 36b. The circumferential seal portion 37b and a tube axial seal portion (not shown) installed in the tube axial groove portion 36c are integrally formed.
The tube axial direction seal portions of both second seal members 37 contact each other in a sealed state (watertight state) from the pipe radial direction between the dividing surfaces of both connecting flange portions 30C. The first circumferential seal portion 37a and the second circumferential seal portion 37b of both the second seal members 37 are attached to the outer circumferential surfaces 1a, 2c of both fluid pipes 1, 2 at both pipe support portions 30d, 30e of the joint ring 30. Contact is made in a sealed manner along the circumferential direction of the tube.

As shown in FIGS. 2 and 5, the first detachment prevention portion 4 is located on the inner circumferential surface 30f between the tube support portions 30d and 30e of the two split joint ring cases 30A and 30B, and in the direction other than the tube axis direction. A semi-circular annular shape protrudes inward in the pipe radial direction to a position where it can come into contact with the heads 23A of the plurality of T-head bolts 23 of the first fastener 25 from the pipe axis direction, at the portion deviated to the end side. A detachment prevention wall portion 41 is integrally formed. In this embodiment, the detachment prevention wall 41 is formed at the boundary between the peripheral wall 30a and the tapered side wall 30c on the inner peripheral surfaces 30f of the split joint ring cases 30A, 30B.
Of both side surfaces of the detachment prevention wall portion 41, the side surface that faces the heads 23A of the plurality of T-head bolts 23 in the tube axis direction is in a detached state due to contact with the heads 23A of the T-head bolts 23. The abutting surface 41a prevents the socket 2A and the joint ring 30 from coming into contact with each other and preventing relative separation movement beyond a certain level.
A plurality of metal T-head bolts 23 arranged at predetermined intervals in the pipe circumferential direction are configured to double as an abutment member 45 fixed to the socket 2A side, and the head 23A of each T-head bolt 23 is The abutment surface 23a, which is a flat top surface, is formed on the abutment surface 45a of the abutment member 45.
Each of the contact surfaces 45a of the contact member 45 constituted by the contact surface 41a of the detachment prevention wall portion 41 and the contact surface 23a of the head 23A of each T-head bolt 23 is perpendicular to the tube axis. It is formed on orthogonal planes.

When a detachment force due to an earthquake or immovable settlement is applied to the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the socket 2A of the other fluid pipe 2, as shown in FIG. , the abutting member 45 is constituted by the abutting surface 41a of the detachment prevention wall 41 in the joint ring 30 and the abutting surface 23a of the head 23A of each T-head bolt 23 fixed to the socket 2A side. The contact surface 45a makes surface contact from the tube axis direction, and further separation movement of the socket 2A of the fluid tube 2 and the coupling ring 30 is prevented. At this time, since the abutment surface 41a of the detachment prevention wall portion 41 in the joint ring 30 and the abutment surface 45a of the abutment member 45 are formed in orthogonal surfaces perpendicular to the tube axis, the detachment prevention wall The abutting surface 41a of the portion 41 and the abutting surface 45a of the abutting member 45 come into contact with each other along the orthogonal direction. Thereby, it is possible to reliably absorb the detachment force and improve the detachment prevention effect. Furthermore, since no push-opening force is generated at the split joints that acts on both split joint cases 30A and 30B of the joint ring 30 when they come into contact, the sealing performance at the split joints of both split joint cases 30A and 30B is reduced. Can be suppressed.

In this embodiment, as shown in FIG. 2, the state in which the tip of the T-head bolt 23 of the fitting connection part 20 is in contact with the inner surface of the side wall part 30b on one end side of the joint ring 30 is the initial assembled state. Become. Further, as shown in FIG. 3, the state in which the abutment surface 23a of the head 23A of the T-head bolt 23 abuts the abutment surface 41a of the detachment prevention wall 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 abutment surface 23a of the head 23A of the T-head bolt 23 to the abutment surface 41a of the detachment prevention wall 41 in the initial assembled state becomes the maximum detachment movement distance L. In the maximum separation movement state, as shown in FIG. 3, the connection between the insertion port 1A of one fluid pipe 1 and the socket 2A of the other fluid pipe 2 is released.

As shown in FIGS. 1 and 2, the second detachment prevention part 5 is composed of an earthquake-resistant reinforcing metal fitting 50 having a split structure. This seismic reinforcing fitting 50 includes a pair of metal divided clamping members 51 which are divided into two in the pipe circumferential direction and are clamped and fixed to the insertion port 1A of one fluid pipe 1 in a manner that allows the pipe to be detached from the pipe diameter direction. is provided. The pair of split holding members 51 can be inserted into the fluid pipe 1 by tightening and connecting the flange parts 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 clamped and fixed to the mouth 1A.

The connecting portion 52 of the seismic reinforcing metal fitting 50 has an annular engagement protrusion 53 formed protrudingly formed on the outer circumferential surface of the tube support portion 30d on one end side of the joint ring 30, and an annular engagement protrusion 53 extending outward in the pipe radial direction with respect to the engagement protrusion 53. The engagement recess 54 is removably engaged from one side. The engagement recess 54 is formed to open inward in the radial direction at a portion of each divided holding member 51 that integrally projects from the intermediate portion in the circumferential direction along the tube axis direction.
When attaching the seismic reinforcing metal fitting 50 to the insertion port 1A of the fluid pipe 1, as shown in FIGS. It engages with the engagement protrusion 53 of the side tube support portion 30d from the outside in the tube radial direction, and in this state, the flange portions 51A of both split holding members 51 are connected to each other by the bolts 48 and nuts 49 of the third fastener 47. Tighten and connect.

As shown in FIG. 1, gap regulating bolts 58 that come into contact with the outer circumferential surface 1a of the insertion port 1A from the pipe radial direction are screwed into multiple locations in the pipe circumferential direction of the pipe support portion 30d on one end side of the joint ring 30. There is. By screwing together the plurality of gap regulating bolts 58, the annular gap between the inner circumferential surface of the tube support portion 30d on the one end side and the outer circumferential surface 1a of the insertion port 1A is regulated to a constant value.
When a strong disengagement force due to an earthquake or uneven settlement is applied, the engagement recess 54 of the seismic reinforcing fitting 50 and the engagement protrusion 53 of the tube support section 30d at one end of the joint ring 30 move in the direction of the tube axis. engage from. When a stronger force is applied in the disengagement direction in this engaged state, the tube support portion 30d at one end of the joint ring 30 deforms toward the tube axis, and the engagement recess 54 of the seismic reinforcement fitting 50 and the joint ring 30 There is a possibility that the engagement with the engagement protrusion 53 may be disengaged. However, in the present embodiment, the plurality of gap regulating bolts 58 can prevent the tube support portion 30d at one end of the joint ring 30 from deforming toward the tube axis, and the engagement recess of the seismic reinforcing fitting 50 can be prevented from deforming toward the tube axis. 54 and the engagement protrusion 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 accommodating portion 56 that opens radially inward and is formed on the inner peripheral surface of the split holding member 51. A claw member 57 is provided in the storage portion 56 so as to be movable inward in the radial direction of the tube. On the inner surface of the claw member 57, a plurality of rows of sharp tapered blade portions are formed along the tube circumferential direction and can bite into the outer circumferential surface 1a of the insertion port 1A.
The outer surface of the claw member 57 and the ceiling surface of the claw storage portion 56 are inserted into the claw storage portion 56 of the two-split holding member 51 and the outer circumferential surface 1a of the socket 1A, so that the claw member 57 is stored in the claw storage portion 56. The claw member 57 is formed into an inclined surface that bites inward in the radial direction and moves as the claw member 57 moves relative to the pipe axis in the direction of the tube axis.

When a detachment force due to an earthquake, uneven settlement, etc. acts on the fitting connection portion 20 between the insertion port 1A of one fluid pipe 1 and the socket 2A of the other fluid pipe 2, one fluid pipe 1 Between the socket 1A and the connecting ring 30, the connection part 52 of the seismic reinforcing metal fitting 50 with a split structure provided in the socket 1A is fixedly connected to the tube support part 30d at one end of the connecting ring 30. The connection between the joint ring 30 and the seismic reinforcing metal fitting 50 is maintained firmly. Further, the claw member 57 of the retaining portion 55 of the seismic reinforcement fitting 50 is pulled out by biting into the outer peripheral surface 1a of the insertion hole 1A as the insertion hole 1A moves away from the tube support portion 30d on the one end side of the joint ring 30. Stopping resistance increases. Therefore, as a whole, the insertion port 1A of one fluid pipe 1 and the pipe support portion 30d at one end of the joint ring 30 are integrally and firmly fixedly connected via the seismic reinforcing metal fitting 50.
As a result, as shown in FIG. 3, even if the insertion port 1A and the socket 2A are separated, the socket 2A can be removed from the tube support portion 30e on the other end side of the joint ring 30, and the joint ring 30 can be removed. It is possible to firmly prevent the insertion port 1A from slipping out and moving with respect to the tube support portion 30d on the one end side.
Furthermore, the tube support portion 30d at one end of the joint ring 30 and the retaining portion 55 of the seismic reinforcing metal fitting 50 support two locations spaced apart in the tube axis direction at the insertion port 1A of the fluid tube 1. As shown in FIG. 3, in the disconnected state where the socket 1A and the socket 2A are disconnected, bending between the socket 1A and the tube support portion 30d at one end of the connecting ring 30 can be suppressed.

As shown in FIGS. 2 and 3, the tilting regulating portion 9 is configured to close the insertion port in a state where the insertion port 1A of one fluid pipe 1 and a socket 2A of the other fluid pipe 2 are fitted and connected, and in a separated state. It includes a tilting regulating body 90 that is externally mounted on the housing 1A, and a fixed connecting portion 91 that fixedly connects this tilting regulating body 90 to the socket 2A. The tilt regulating body 90 is integrated with a tilt regulating cylindrical portion 90b forming a tilt regulating surface 90a having an inner diameter slightly larger than the outer diameter of the insertion port 1A, and radially outward from the outer peripheral surface of the tilt regulating cylindrical portion 90b. It has a connecting flange portion 90c that protrudes from the outside.
As shown in FIG. 3, the tilting regulating surface 90a of the tilting regulating body 90 is in a detached state in which the socket 1A and the socket 2A are disconnected from each other, and the tilting regulating surface 90a of the tilting regulating body 90 is connected to the socket 1A with respect to the tube support portion 30d on one end side of the joint ring 30. When tilting, it comes into contact with the outer surface of the end of the socket 1A to restrict further tilting.

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

As shown in FIGS. 2 and 6, the connecting flange portion 90c of the two divided tilting restriction members 90A and 90B has a one end side of the joint ring 30 when the socket 1A and the socket 2A are disconnected from each other. A tilting restriction protrusion 95 is provided which restricts further tilting of the socket 1A by coming into contact with the inner surface of the joint ring 30 as the socket 1A tilts relative to the tube support portion 30d. This tilting restriction protrusion 95 is provided at one or more locations of each connecting flange portion 90c. In this embodiment, the tilting restriction protrusions 95 are formed to protrude outward in the pipe radial direction from two locations in the circumferential direction of each connection flange portion 90c.

As shown in FIG. 2, the tilting regulating cylinder portions 90b of the two divided tilting regulating members 90A and 90B have a taper formed between the tapered inner circumferential surface 22c of the press ring 22 and the outer circumferential surface 1a of the insertion port 1A. An engaging protrusion 90e is formed to protrude into the shaped gap from the direction of the tube axis. As shown in FIG. 3, the engaging protrusions 90e of the two divided tilting restriction members 90A and 90B engage the tapered inner circumferential surface 22c of the press ring 22 even in the detached state where the socket 1A and the socket 2A are disconnected. The engagement is maintained. In this detached state, the engagement protrusions 90e of both divided tilting restriction members 90A, 90B and the tapered inner circumferential surface 22c of the press ring 22 engage with each other, thereby causing the insertion opening 1A for the tube support portion 30d on the one end side of the joint ring 30. tilting is regulated.

As shown in FIGS. 2 and 6, the fixed connection portion 91 of the tilting restriction portion 9 is constituted by the first fastener 25 of the fitting connection portion 20. Specifically, a bolt insertion hole through which the tip of the T-head bolt 23 can be inserted is provided in a portion corresponding to each T-head bolt 23 of the first fastener 25 in the connecting flange portion 90c of the two divided tilting restriction members 90A, 90B. 91a is formed. A fixed connection nut 91b is screwed onto the tip of the T-head bolt 23 inserted through each bolt insertion hole 91a of both divided tilting restriction members 90A and 90B. By tightening this fixed connection nut 91b, the tilting regulating body 90 is fixedly connected to the socket 2A.

As shown in FIG. 3, in the detached state where the socket 1A and the socket 2A are disconnected, bending force due to earthquakes, uneven force due to fluid pressure, etc. acts, and as shown in FIG. In addition, the socket 1A may tilt relative to the tube support portion 30d at one end of the joint ring 30. At this time, the outer surface of the end of the socket 1A comes into contact with the tilting regulating surface 90a of the tilting regulating body 90, and a part of the tilting regulating protrusion 95 of the tilting regulating body 90 comes into contact with the inner surface of the joint ring 30. This maintains the bending state between the insertion port 1A and the tube support portion 30d at one end of the joint ring 30 within an appropriate range in the detached state, and prevents local deterioration of sealing performance in the circumferential direction of the seal portion 35. The resulting fluid leakage can be suppressed.

In addition, in the first detachment prevention part 4 of the above-mentioned first embodiment, the contact surface 41a of the detachment prevention wall part 41 provided in the joint ring 30 and each T-head bolt 23 fixed to the socket 2A side. The structure is such that the contact with the head 23A prevents the socket 2A from moving away from the joint ring 30. However, the configuration is not limited to this. For example, in the case of the collar 30 in which the detachment prevention wall portion 41 is not provided, the first detachment prevention portion 4 is, as explained with reference to FIGS. On the other end side in the tube axis direction on the inner surface between, in other words, on the side wall portion 30c on the other end side of the joint ring 30, from the tapered outer circumferential surface portion 2e on the outer circumferential surface 2c of the socket 2A and from the tube axis direction. A thick detachment prevention part 42 that can be contacted is formed. The abutment surface 42a of the detachment prevention portion 42 is formed into a tapered shape having the same slope as the tapered outer circumferential surface portion 2e of the outer circumferential surface 2c of the socket 2A.

In the above-mentioned first detachment prevention part 4, when a detachment force due to an earthquake, uneven settlement, etc. acts on the fitting connection part 20 between the socket 1A and the socket 2A, the side wall on the other end side of the joint ring 30 The abutting surface 42a of the detachment preventing portion 42 formed on the portion 30c comes into contact with the tapered outer circumferential surface portion 2e of the outer circumferential surface 2c of the socket 2A, thereby preventing further detachment movement of both. At this time, since the contact surface 42a of the detachment prevention part 42 is formed in a tapered shape with the same slope as the tapered outer peripheral surface portion 2e of the outer peripheral surface 2c of the socket 2A, the contact surface 42a of the withdrawal prevention part 42 and the tapered outer circumferential surface portion 2e of the socket 2A come into contact with each other in a face-to-face state, thereby strongly preventing the socket 2A and the connecting ring 30 from moving apart.
Moreover, when the abutment surface 42a of the detachment prevention part 42 abuts against the tapered outer circumferential surface portion 2e of the socket 2A, a force is generated that pushes open the divided surface of the split ring 30. However, in the present invention, the abutment surface 42a of the detachment prevention part 42 is formed on the other end side in the tube axis direction between the two tube supports 30d and 30e of the joint ring 30, so the two tube supports 30d , 30e, the push-opening force becomes smaller by the amount of deviation of the abutment surface 42a of the detachment prevention part 42, and fluid leakage occurs due to a decrease in the sealing performance of the seal part 35 due to the push-opening of the dividing surface of the joint ring 30. can be suppressed.

[Another connection structure of the tilting regulating body 90 of the first embodiment]
In the first embodiment described above, as shown in FIG. 6, as a first example of the tilting regulating body 90, the connecting pieces 90d provided at both end portions of the divided tilting regulating members 90A and 90B in the circumferential direction are connected to each other by bolts. They were connected using a fourth fastener 92 such as 93 and nut 94. Instead of this connection structure of the tilting regulating body 90, another connection structure shown in FIG. 7 may be adopted. In this other connection structure, second connection pieces 90f that can be arranged overlapping each other from the radial direction are integrally formed at both end portions in the circumferential direction of both divided tilting restriction members 90A and 90B. A second bolt insertion hole 91c into which the tip of the T-head bolt 23 can be inserted is formed in each set of second connecting pieces 90f arranged in an overlapping manner. Thereby, by using the T-head bolt 23 and the fixed connection nut 91b that constitute the fixed connection part 91 of the tilt control part 9, the two divided tilt control members 90A and 90B can be connected in an annular shape.

[Second embodiment of tilting regulating body 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 position of contact with the inner surface of the joint ring 30 can be changed in the pipe diameter direction. Specifically, the tilting restriction protrusion 95 is screwed into female threaded portions 95A formed at two locations in the circumferential direction of each divided tilting restriction member 90A, 90B from the pipe radial direction. It includes a tilting regulating bolt 95B and a lock nut 95C that fixes the tilting regulating bolt 95B whose contact position in the tube diameter direction is adjusted. By this screwing operation of the tilting regulating bolt 95B, the contact position with respect to the inner surface of the joint ring 30 is changed in the pipe diameter direction.

When the tilting regulating body 90 of the split structure of the tilting regulating part 9 is mounted on the socket 1A, there are places where the socket 2A and the socket 1A are bent at the fitting connection part 20. Even in this case, the abutting position of the tilt regulating bolt 95B is determined based on the measured distance between the tip of the tilt regulating bolt 95B of the tilt regulating body 90 and the protrusion abutting part on the inner peripheral surface 30f of the joint ring 30. The direction can be changed. As a result, even in a field where the socket 2A and the socket 1A are bent at the fitting connection part 20, the exterior assembly work of the tilting restriction part 9 to the socket 1A can be performed efficiently and reliably. . Moreover, when a bending force due to an earthquake or an uneven force due to fluid pressure is applied in the disengaged 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 separation prevention structure of the pipe connection portion shown in FIGS. 9 and 10, the tilting restriction protrusion 95 of the tilting restriction body 90 described in the above-mentioned first embodiment is omitted. Therefore, as shown in FIG. 10, in the detached state where the socket 1A and the socket 2A are disconnected, bending force due to earthquakes, uneven force due to fluid pressure, etc. acts, and one end of the joint ring 30 is The insertion port 1A tilts with respect to the side tube support portion 30d. At this time, the outer surface of the end of the socket 1A comes into contact with the tilting regulating surface 90a of the tilting regulating body 90. As a result, the bending state between the insertion port 1A and the tube support portion 30d on one end side of the joint ring 30 in the detached state is maintained within an appropriate range, and it is possible to maintain the bending state between the insertion port 1A and the tube support portion 30d on the one end side of the joint ring 30 within an appropriate range. leakage of fluid can be suppressed.
Note that the other configurations are the same as those described in the first embodiment, so the same components are given the same numbers as in the first embodiment, and the explanation thereof will be omitted.

[Third embodiment]
In the third embodiment of the separation prevention structure of the pipe connection part shown in FIGS. 11 to 13, the fitting connection part 20 between the insertion port 1A of one fluid pipe 1 and the socket 2A of the other fluid pipe 2 is T-shaped. It consists of mechanical joints. This T-shaped mechanical joint has an annular seal holding groove 60 formed on the inner peripheral surface of the socket 2A that opens radially inward, and an outer peripheral surface 1a of the socket 1A that is fitted and connected to the socket 2A. A third sealing member 61, such as a rubber ring, which is compressed in a sealed state (watertight state) between the two parts is attached.

In the split ring 30 that seals around the fitting connection part 20, when the socket 2A and the insertion port 1A are disconnected from each other, there is a gap between the fitting ring 30 and the tube support part 30d on one end side. A tilting regulating portion 9 is provided to regulate the tilting of the insertion port 1A.
As shown in FIGS. 11 and 12, the tilting regulating portion 9 is configured to close the insertion port in a state where the insertion port 1A of one fluid pipe 1 and a socket 2A of the other fluid pipe 2 are fitted and connected and in a separated state. It includes a tilting regulating body 90 that is externally mounted on the housing 1A, and a fixed connecting portion 91 that fixedly connects this tilting regulating body 90 to the socket 2A. The tilting regulating body 90 has a tilting regulating surface 90a having an inner diameter slightly larger than the outer diameter of the insertion port 1A. As shown in FIG. 12, this tilting regulating surface 90a is configured such that when the socket 1A is tilted relative to the tube support portion 30d at one end of the joint ring 30 in a detached state in which the socket 1A and the socket 2A are disconnected, It comes into contact with the outer surface of the end of the socket 1A to restrict further tilting.

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

As shown in FIGS. 11 and 13, both second divided tilting restriction members 90C and 90D have a tube support portion on one end side of the joint ring 30 when the socket 1A and the socket 2A are disconnected from each other. A tilting restriction protrusion 95 is provided which restricts further tilting of the socket 1A by coming into contact with the inner surface of the joint ring 30 as the socket 1A tilts relative to the socket 30d. The tilting restriction protrusion 95 is provided at one or more locations in each of the divided tilting restriction members 90A and 90B. In this embodiment, the tilting restriction protrusions 95 are formed to protrude outward along the tube diameter direction from two locations in the circumferential direction of each divided tilting restriction member 90A, 90B.

The tilting restriction protrusion 95 is configured to be able to change the position of contact with the inner surface of the joint ring 30 in the pipe diameter direction. Specifically, the tilting restriction protrusion 95 is screwed into female threaded portions 95A formed at two locations in the circumferential direction of each divided tilting restriction member 90A, 90B from the pipe radial direction. It includes a tilting regulating bolt 95B and a lock nut 95C that fixes the tilting regulating bolt 95B whose contact position in the tube diameter direction is adjusted. By this screwing operation of the tilting regulating bolt 95B, the contact position with respect to the inner surface of the joint ring 30 is changed in the pipe diameter direction.

The fixed connection part 91 is a second engagement protrusion provided on the tilting regulating body 90 in a state that it can be engaged and detached from the outside in the pipe diameter direction with respect to the annular protrusion 2g formed at the end of the outer circumferential surface 2c of the socket 2A. 91d and the second engaging protrusion 91d of the tilt regulating body 90 are engaged with the annular protrusion 2g of the socket 2A, and the third connecting pieces 90g of the second divided tilt regulating members 90C and 90D are connected to the socket 1A. and a fourth fastener 92 that is tightened and fixed in a sandwiched state.

As shown in FIGS. 11 and 12, the socket 2A and the socket 1A are disconnected from each other at a portion where the joint ring 30 and the socket 2A side of the other fluid pipe 2 face each other in the tube axis direction. A first detachment prevention portion 4 is provided that allows relative detachment movement up to the detachment state and prevents the socket 2A and the joint ring 30 from coming into contact with each other more than a certain amount of relative detachment movement in the detachment state.
As shown in FIGS. 11 and 12, the first detachment prevention portion 4 is located on the inner circumferential surface 30f between the tube support portions 30d and 30e of the two split joint ring cases 30A and 30B, and in the other direction in the tube axis direction. In the part deviated to the end side, the contact portion 90h formed on the other end side of both the second divided tilting restriction members 90C and 90D is moved inward in the pipe radial direction to a position where it can come into contact from the pipe axis direction. A protruding semi-circular detachment prevention wall portion 41 is integrally formed. In this embodiment, the detachment prevention wall 41 is formed at the boundary between the peripheral wall 30a and the tapered side wall 30c on the inner peripheral surfaces 30f of the split joint ring cases 30A, 30B.
Of both side surfaces of the detachment prevention wall portion 41, the side surface that faces the abutting portion 90h of the second divided tilting regulating members 90C, 90D in the tube axis direction is the one facing the abutting portion 90h of the second divided tilting regulating members 90C, 90D. The abutment surface 41a is configured to abut against and prevent relative detachment movement of the socket 2A and the joint ring 30 beyond a certain level in the disengaged state by abutting the contact portion 90h.
Note that the other configurations are the same as those described in the first embodiment, so the same components are given the same numbers as in the first embodiment, and the explanation thereof will be omitted.

[Other embodiments]
(1) In the above-described first embodiment, the tilting regulating body 90 is brought into contact with the outer surface of the socket 1A that tilts with respect to the tube support portion 30d on the one end side of the joint ring 30, thereby causing the tilting of the socket 1A. Further tilting of the socket 1A is restricted by contacting the inner surface of the joint ring 30 as the socket 1A tilts with respect to the tube support portion 30d on the one end side of the joint ring 30. A tilting restriction protrusion 95 is provided. However, the configuration is not limited to this, and, for example, it may be implemented using only one tilting regulating surface 90a or the tilting regulating protrusion 95.

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

(3) In the first embodiment described above, the second detachment prevention part 5 was constructed from the seismic reinforcing metal fitting 50 with a split structure separate from the joint ring 30. 30 may be assembled. In this case, as the fitting 1A moves away from the tube support 30d on the one end side of the fitting ring 30 in the tube axis direction, the outer circumferential surface of the fitting 1A is A retaining portion 55 is provided to increase the retaining resistance between the retainer and the retainer.

1 Pipe section (fluid pipe)
1A Socket 1a Outer circumferential surface 2 Second detachment prevention part 2A Socket 2a Inner circumference 2c Outer circumference 2e Tapered outer circumference 2g Annular protrusion 4 First detachment prevention part 5 Second detachment prevention part 9 Tilt regulating part 20 Fitting Connection part 21 Seal member (first seal part)
22 Push ring 22a Pressing part 25 Fastener (first fastener)
30 Joint ring 30d Pipe support part 60 Seal holding groove 61 Seal member (third seal member)
90 Tilt regulation body 90A Divided tilt regulation member 90B Divided tilt regulation member 90C Second divided tilt regulation member 90D Second divided tilt regulation member 90a Tilt regulation surface 91 Fixed connection part 91d Engagement protrusion (second engagement protrusion)
92 Fasteners (4th fasteners)
95 Tilt control protrusion

Claims (5)

A split-structure joint ring that sealingly surrounds the fitting connection between the insertion port of one pipe part and the socket of the other pipe part is provided over both pipe parts, and the joint ring and the other pipe part are connected to each other. A portion of the pipe portion that faces the socket side in the tube axis direction is configured to allow relative withdrawal movement up to a detached state in which the socket and the insertion port are disconnected, and in the detached state. A first disengagement prevention portion is provided for preventing relative disengagement movement of the socket and the coupling ring by a certain amount or more; A second detachment preventing portion is provided in the connecting ring, and includes a detachment preventing portion that increases resistance against detachment from the outer circumferential surface of the insert as the insert moves to detach. , a tilting regulating part is provided for regulating tilting of the socket with respect to a tube support part on one end side of the joint ring, and the socket and the socket are fitted and connected to the tilting regulating part. and a tilting restriction body having a split structure and having a tilting regulating surface that is externally attached to the socket in the detached state and that can come into contact with an outer surface of the socket that tilts in the detached state, and the tilting regulating body is connected to the receiving socket. a fixed connection part that is fixedly connected to the opening, and the tilt restriction body is provided with a tilt restriction protrusion that comes into contact with the inner surface of the joint ring as the socket is tilted in the disengaged state. Structure to prevent separation of pipe connections. 2. The separation prevention structure for a pipe connection part according to claim 1, wherein the tilting restriction protrusion is configured to be able to change a contact position with respect to the inner surface of the joint ring in a pipe radial direction. The fitting connection portion includes a sealing member installed between an outer circumferential surface of the socket and a tapered inner circumferential surface of the socket, and a sealing member movably mounted on the socket; a press ring having a pressing part capable of pressing the socket from the tube axis direction, and a fastener that tightens and fixes the socket and the press ring from the tube axis direction, the fixed connecting part of the tilting regulating part being The separation prevention structure for a pipe connection portion according to claim 1 or 2, wherein the structure comprises the fastener of the fitting connection portion. The fitting connection portion is configured to maintain a watertight state between a seal retaining groove that opens radially inward and formed on an inner circumferential surface of the socket and an outer circumferential surface of the socket that is fitted and connected to the socket. The fixed connecting portion of the tilting restriction portion engages with an annular projection formed at an end of the outer circumferential surface of the socket from the outside in the radial direction of the pipe. The divided tilting regulating members of the tilting regulating body are engaged with each other in a state where the engaging protrusion provided on the tilting regulating body and the engaging protrusion of the tilting regulating body are engaged with the annular protrusion of the socket in a possible state. 3. The separation prevention structure for a pipe connection part according to claim 1, further comprising a fastener that clamps and fixes the pipe connection part to the insertion port in a clamped state. A split-structure fitting ring that sealingly surrounds the fitting connection between the insertion port of one pipe part and the socket of the other pipe part is provided over both pipe parts, and the pipe axis of the fitting ring is between the inner circumferential surface of the tube support section on one end side in the direction and the outer circumferential surface of one of the tube sections, and between the inner circumferential surface of the tube support section on the other end side in the tube axis direction of the joint ring and the other side. A seal portion is provided to seal between the outer circumferential surface of the pipe portion, and a seal portion is provided at a portion where the joint ring and the socket side of the other pipe portion face each other in the tube axis direction. a first detachment that allows relative detachment movement up to a detachment state in which the connection with the socket is disconnected, and that prevents relative detachment movement of the socket and the connecting ring by a certain amount or more in the detachment state; A blocking portion is provided on the tube support portion side at one end in the tube axial direction of the joint ring, and as the insertion port moves away, resistance to prevent it from coming off increases between the fitting ring and the outer circumferential surface of the insertion port. A second detachment preventing portion is provided in the coupling ring, and a tilting regulating portion is provided in the coupling ring for regulating tilting of the insertion port with respect to a tube support portion on one end side of the coupling ring in the disengaged state. and the seal portion is configured by attaching a second seal member to an annular seal holding groove formed in each of the split fitting ring cases of the fitting ring, and the seal holding groove is attached to a pipe support on one end side. a first circumferential groove formed on the inner circumferential surface of the tube support section; and two second circumferential grooves formed at intervals in the tube axis direction on the inner circumferential surface of the tube support section on the other end side; a tube axial groove that communicates a circumferential end of the first circumferential groove with two circumferential ends of the second circumferential groove; A first circumferential seal portion installed in the direction groove, a second circumferential seal portion installed in each of the two second circumferential grooves, and a tube axial seal installed in the tube axial groove. Separation prevention structure for pipe connection parts, which is constructed by integrally forming parts and .

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