JP2019157890A - Withdrawal prevention structure of pipe connection part - Google Patents

Abstract

To provide a withdrawal prevention structure of a pipe connection part in which a leakage of fluid caused by reduced seal at a seal part as both pipes are relatively withdrawn and moved can be restricted by a rational improvement of a thimble and the withdrawal and moved state of pipe joint parts of both pipes can be easily estimated from outside.SOLUTION: This invention relates to a withdrawal prevention structure of a pipe connection part in which a thimble 3 having a block construction enclosing a pipe connection part 4 for both pipe parts 1, 2 under a hermetic seal state is installed outward over both pipe parts 1, 2 and there is provided separation movement prevention means 9 abutted and prevented a relative withdrawal of both pipe parts 1, 2 more than a specified relative separation movement. The thimble 3 comprises a first thimble 30 outwardly installed and fixed to one pipe part 1 and a second thimble 50 outwardly installed and fixed to the other pipe part 2. The first thimble 30 and the second thimble 50 are slidably fitted and connected to each other in a pipe axial core part and there is provided a seal part 62 for slidably close sealing the fitted and connected part between the first thimble 30 and the second thimble 50.SELECTED DRAWING: Figure 3

Description

  According to the present invention, a split ring that surrounds the pipe connection portions of both the pipe portions in a sealed state is sheathed over the two pipe portions, and the detachment prevents the relative separation movement of both the pipe portions from exceeding a certain level. The present invention relates to a structure for preventing separation of a pipe connecting portion provided with a movement preventing means.

  For example, there is a pipe mounting structure shown in Patent Literature 1 as the above-described structure for preventing the connection of the pipe connecting portion from being detached. This pipe mounting structure is an example of the pipe connection part of both pipe parts, and the pipe connection part of the insertion port of one pipe part and the receiving port of the other pipe part is comprised from the K-shaped mechanical coupling. This mechanical joint is equipped with a sealing material such as a rubber ring between the outer peripheral surface of the insertion port and the tapered inner peripheral surface of the receiving port, and includes a pressing portion that can press the sealing material from the tube axis direction. The flange part of the press ring and the flange part 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 at the pressing portion of the press ring that is attracted and fixed to the flange portion of the receiving port, and the watertight state is maintained.

In addition, the joint ring of the split structure that surrounds the mechanical joint that is the pipe connection portion in a sealed state is a cylindrical peripheral wall portion having a diameter larger than the receiving port, and radially inward from both ends of the peripheral wall portion in the tube axis direction. The main components are an annular side wall portion that is integrally extended, and a tube holding portion that is integrally extended outward from the inner diameter side end portion of each side wall portion along the tube axis direction. I have.
The inner peripheral surface of both pipe holding portions of the joint ring is provided with a seal portion on which a sealing material that seals between the outer peripheral surfaces of both pipe portions is mounted.

  The disengagement movement preventing means is formed so that the inner diameter of the tube holding portion located on the receiving side of the joint ring is smaller than the maximum outer diameter of the tapered portion of the receiving port. The tube holding portion on the receiving end side of the ring is configured to abut against the tapered portion of the receiving end from the tube axis direction to prevent further separation movement.

  In addition, a separation restricting portion having a split structure having 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. The detachment restricting portion that is formed larger than the inner diameter of the tube holding portion on the insertion side and is clamped and fixed to the insertion port at the time of separation between the insertion port and the receiving port holds the tube on the insertion side of the joint ring It is configured to abut against the portion from the tube axis direction and prevent further detachment movement.

Japanese Patent Laid-Open No. 2006-138737

In the pipe mounting structure shown in Patent Document 1, both pipe holding portions of the joint ring are covered over the outer peripheral surface on the insertion side of one pipe portion and the outer peripheral surface on the receiving side of the other pipe portion. The sealing material of the sealing portion provided on the inner surface of the holding portion slidably contacts the outer peripheral surface of the insertion portion of the tube portion and the outer peripheral surface of the reception portion of the tube portion, so that both pipes of the joint ring The space between the inner peripheral surface of the holding portion and the outer peripheral surfaces of both tube portions is sealed.
However, there is a high possibility that the outer peripheral surfaces of both pipe parts, on which the pipe holding parts of the joint ring are exteriorized, are rusted by being buried in the soil or deformed by earth pressure. For this reason, measures are taken to clean the outer peripheral surfaces of both pipe portions and to perform a water pressure test on the seal portion provided on the inner peripheral surface of both pipe holding portions of the joint ring when the joint ring is mounted. However, even if such measures are taken, the sealing position between the sealing material of both pipe holding parts of the joint ring and the outer peripheral surface of both pipe parts is in the direction of the pipe axis along with the relative separation movement of both pipe parts. Therefore, if the outer peripheral surfaces of both pipe parts are deformed at the changed sealing position, the sealing performance in the circumferential direction of the seal part of both pipe holding parts of the joint ring is locally reduced. There is an inconvenience that fluid leakage occurs from a site where the sealing performance is lowered.
Moreover, since the total length of the joint ring in the direction of the pipe axis is set to a length that allows for the maximum amount of movement of both pipe parts, even if the joint ring is inspected after the lapse of a predetermined period after the completion of construction. The state of detachment movement of the pipe joint portions of both pipe portions cannot be estimated.

  In view of this situation, the main problem of the present invention is that by rational modification of the joint ring, it is possible to suppress fluid leakage due to a decrease in the sealing performance of the seal part due to the relative separation movement of both pipe parts, and Further, the present invention is to provide a structure for preventing the connection of the pipe connecting portions from being easily inferred from the outside of the disengagement movement state of the pipe joint portions of both the pipe portions.

In the first characteristic configuration of the present invention, a split ring joint that surrounds the pipe connection portions of both the pipe portions in a sealed state is sheathed over the two pipe portions, and the relative separation movement of both the pipe portions is more than a certain level. A disconnection preventing structure for a pipe connecting portion provided with a disengagement movement preventing means for preventing contact,
The joint ring includes a first joint ring that is externally fixed to one of the pipe parts, and a second joint ring that is externally fixed to the other pipe part, and the first joint ring and the second joint ring. The ring is slidably fitted and connected to the tube axis, and a seal portion is provided for slidably sealing the fitting connection between the first and second joint rings. It is in.

According to the above configuration, one first joint ring constituting the joint ring is externally fixed to one pipe part, and the other second joint ring is externally fixed to the other pipe part. The first joint ring and the second joint ring, which are externally fixed to both pipe portions, are slidably fitted and connected to the pipe axis direction. As a result, when a detachment force due to an earthquake or non-uniform settlement acts on the pipe connection parts of both pipe parts, the first and second joint rings are separated from each other along with the detachment movement of both pipe parts. It smoothly slides at the fitting connection portion with high processing accuracy as compared with the outer peripheral surface. Therefore, the sealing performance in the circumferential direction of the seal portion provided in the fitting connection portion is maintained constant or substantially constant in the entire movement range in the fitting connection portion between the first joint ring and the second joint ring. Can do.
Moreover, when the joint ring is inspected after the lapse of a predetermined period after the completion of the construction, the disengagement movement state of the pipe joint portions of both pipe portions can be easily estimated from the fitting connection state of the first joint ring and the second joint ring. can do.
Therefore, as described above, both pipe parts in which the joint ring is sheathed by a rational modification of the first joint ring 30 and the second joint ring 50 that are slidably fitted and connected as described above. It is possible to avoid the influence of rusting or deformation of the outer peripheral surface of the sealing member, and to suppress the leakage of the fluid due to the local deterioration of the sealing performance in the circumferential direction of the sealing portion. Moreover, since the disengagement movement state of the pipe joint portions of both pipe portions can be easily estimated from the fitting connection state of the first and second joint rings, it is useful information on the pipeline maintenance management. Can be acquired.

  According to a second characteristic configuration of the present invention, the disengagement movement preventing means is provided at a fitting connection portion between the first joint ring and the second joint ring.

  According to the above configuration, the first joint ring externally fixed to the one pipe part and the second joint ring externally fixed to the other pipe part are slidably fitted and connected to the tube axis direction. Therefore, by providing the disengagement movement preventing means at the fitting connection portion, the disengagement movement between the first and second joint rings can be surely prevented at the maximum disengagement position of both pipe portions. Therefore, for example, the contact state with the pipe connection part or the accessory part is improved as in the case of providing a separation movement prevention means between the pipe connection part of both pipe parts or the accessory part attached to the pipe part and the joint ring. Therefore, it is not necessary to take measures to prevent the separation movement preventing means from being simplified.

  According to a third characteristic configuration of the present invention, a tube holding portion that is externally fixed to one of the tube portions is formed at both ends in the tube axis direction of the first joint ring disposed on the inner fitting side. There is in point.

According to the above configuration, the first joint ring disposed on the inner fitting side with respect to the second joint ring is connected to the one pipe via the tube holding portions formed at both ends in the tube axis direction thereof. It is fixed to the exterior with both ends supported. Both ends of the second joint ring arranged on the outer fitting side in the tube axis direction are externally supported in a both-end supported state across the other pipe portion and the first joint ring.
Therefore, compared with the case where the tube holding portion is provided only at one end portion in the tube axis direction of the first joint ring and the other end portion in the tube axis direction of the first joint ring is configured as a free end. Further, it is possible to suppress push-opening at the split joint surface of the first joint ring due to external force, and it is possible to appropriately maintain the sealing performance at the split joint surface of the joint ring.

  According to a fourth characteristic configuration of the present invention, the first joint ring includes a first split joint body that is divided into a plurality of parts in the circumferential direction, and the second joint ring is a second part that is divided into a plurality of parts in the circumferential direction. A split joint body is provided, and the first joint ring arranged on the inner fitting side is slidably guided in the tube axis direction along the fitting side portion of the second joint ring arranged on the outer fitting side. And a fixed connecting portion for fixing and connecting the first divided joint bodies adjacent in the circumferential direction at both outer side portions in the tube axis direction of the sliding guide portion. is there.

  According to the above configuration, the plurality of first divided joints constituting the first joint ring are fixedly connected by the fixed connection portions provided at both outer side portions in the tube axis direction of the sliding guide portion. The pushing-opening at the split joint surface of the first joint ring can be suppressed. Thereby, the fitting side portion of the second joint ring can be smoothly slid and guided in a sealed state along the sliding guide portion of the first joint ring, which has a higher processing accuracy than the outer peripheral surfaces of both pipe portions. it can.

  According to a fifth feature of the present invention, there is provided a first connecting portion fixedly connected to an outer end portion of the first joint ring located on the opposite side to the existence side of the fitting connecting portion, and detachment of the both pipe portions. And a first fixing means having a split structure provided with a first retaining portion that increases a retaining resistance with the outer peripheral surface of one of the tube portions as it moves, and further, the fitting connection portion A second connecting portion fixedly connected to an outer end portion of the second joint ring located on the opposite side of the second joint ring, and an outer peripheral surface of the other pipe portion as the both pipe portions are moved away from each other. The second fixing means is provided with a split structure including a second retaining portion that increases the retaining resistance between them.

  According to the above configuration, the first connecting portion of the first fixing means is fixedly connected to the outer end portion of the first joint ring, and the second connecting portion of the second fixing means is connected to the outer end portion of the second joint ring. The parts are fixedly connected. When the first retaining portion provided in the first fixing means and the second retaining portion provided in the second fixing means cause a detachment force due to an earthquake or non-uniform subsidence to the pipe connecting portions of both pipe portions, The resistance to retaining between the outer peripheral surfaces of both pipe parts increases, and the outer end of the first joint ring is firmly attached to one pipe part, and the outer end part of the second joint ring is firmly attached to the other pipe part. It is held fixed. Therefore, the first joint ring and the second joint ring slide smoothly at the fitting connection part as the both pipe parts move away.

The half sectional side view of the decomposition | disassembly state which shows 1st Embodiment of the detachment | leave prevention structure of a pipe connection part Overall side view during disassembly Cross section of the main part during assembly Cross-sectional view of the main part when detached Sectional drawing of the principal part which shows the modification of 1st Embodiment of the detachment | leave prevention structure of a pipe connection part Sectional drawing of the principal part at the time of the assembly which shows 2nd Embodiment of the separation prevention structure of a pipe connection part Sectional drawing of the principal part at the time of detachment | leave in 2nd Embodiment

Embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
1 to 4 show a structure for preventing separation of a pipe connection portion used in a fluid transportation piping system. In this structure for preventing separation 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 pipe connection portion 20. ing. The split ring 3 that surrounds the pipe connection portion 20 in a sealed state is externally detachably mounted across the fluid pipes 1 and 2.
The joint ring 3 is made of a metal (for example, cast iron) first joint ring 30 that is externally fixed to one fluid pipe 1 from the outside in the pipe diameter direction, and a pipe diameter of the other fluid pipe 2. And a second joint ring 50 made of metal (for example, cast iron) that is externally fixed from the outside in the direction. The first joint ring 30 and the second joint ring 50 are fitted and connected so as to be stretchable in a sliding state along the tube axis direction. The second joint ring 50 is provided with a second seal portion 62 that slidably seals the fitting connection portion 4 between the first joint ring 30 and the second joint ring 50.
Furthermore, in the structure for preventing the disconnection of the pipe connecting portion of the present embodiment, the first fixing means for fixing the one end portion of the first joint ring 30 in the tube axis direction to the insertion port 1A side of one fluid pipe 1 in an integrated state. As a second fixing means for fixing the first seismic reinforcing metal fitting 7 and the one end of the second joint ring 50 in the tube axis direction to the receiving port 2A side of the other fluid pipe 1 in an integrated state. A metal fitting 8 and a detachment movement preventing means 9 for preventing contact between the fluid pipes 1 and 2 and a relative detachment movement of a certain level (a set movable range or more) are provided. The separation movement preventing means 9 is provided in the fitting connection portion 4 between the first joint ring 30 and the second joint ring 50.

In the above-described structure for preventing detachment of the pipe connecting portion, the fluid pipes 1 and 2 are given as examples of the pipe portion, but there are various types of pipe portions. For example, although not shown in the drawings, the split tube portion of the split structure that is hermetically fixed to the fluid tube in a sealed state, the branch tube portion that is integrally formed on the fluid tube, and a part of the fluid equipment And the like.
Furthermore, although the fluid pipes 1 and 2 of this embodiment are ductile cast iron pipes that constitute water pipes for transporting clean water, which is an example of fluid, other cast iron pipes, steel pipes, and the like can be used. As the fluid, industrial water, gas, and the like can be mentioned in addition to clean water.

  As shown in FIGS. 1 to 4, the pipe connection portion 20 between the insertion opening 1 </ b> A of one fluid pipe 1 and the receiving opening 2 </ b> A of the other fluid pipe 2 is configured by 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 having a divided structure including a pressing portion 22a capable of pressing the first seal member 21 from the tube axis direction is externally mounted on the insertion opening 1A. The flange portion 22b of the push ring 22 and the flange portion 2b of the receiving port 2A are tightened and connected from the tube axis direction by a T-head bolt 23 and a nut 24. By this tightening connection, the first seal member 21 is compressed into a watertight state (sealed state) by the pressing portion 22a of the push ring 22 that is attracted and fixed to the flange portion 2b of the receiving port 2A, and the watertight state is maintained.

As shown in FIGS. 1 and 2, the first joint ring 30 of the joint ring 3 is externally attached to the insertion opening 1 </ b> A of the fluid pipe 1 so as to surround a range up to the position corresponding to the root portion of the receiving opening 2 </ b> A of the fluid pipe 2. A first divided joint body 31 having a freely divided structure is provided. Further, each of the first divided joint bodies 31 has a semi-cylindrical first divided peripheral wall portion 32a having a larger diameter than the flange portion 2b of the receiving port 2A, and the first divided peripheral wall portion 32a in the tube axis direction. A semi-circular first divided side wall portion 33a integrally extending radially inward from one end, and integrally formed outward from the inner diameter side end portion of the first divided side wall portion 33a along the tube axis direction. And a semi-cylindrical first divided holding cylinder portion 34a that is extended to the center.
And the cylindrical 1st surrounding wall part 32 in the 1st joining ring 30 is comprised by the 1st division | segmentation surrounding wall part 32a of both the 1st division | segmentation ring bodies 31. As shown in FIG. Further, the annular first side wall portion 33 of the first joint ring 30 is constituted by the first divided side wall portions 33 a of the first divided joint bodies 31. Further, the first joint ring 30 mounted in a state of being held from the radially outer side with respect to the insertion opening 1 </ b> A of the fluid pipe 1 by having both the first divided holding cylinder portions 34 a of the first divided joint body 31. A one-tube holding portion 34 is configured.

  As shown in FIGS. 1 and 2, both ends of the first divided peripheral wall portions 32a of the first divided ring bodies 31 are fixedly connected to each other via fastening means such as bolts 36 and nuts 37. For this purpose, a first connecting flange portion 35 is integrally formed. As shown in FIG. 1, the first divided joint surfaces 38 of the first divided joint bodies 31 are formed on a linear joint end surface 38a on both ends in the circumferential direction of the first divided peripheral wall portion 32a, and on the linear joint end surface 38a. It is comprised from the linear joining end surface 38b of the orthogonal | vertical 1st division | segmentation side wall part 33a, and the semicircular arc-shaped joining surface 38c of the 1st division | segmentation holding cylinder part 34a.

  A region extending over both linear joint end surfaces 38a on the first divided peripheral wall portion 32a side, linear joint end surfaces 38b on the first divided side wall portion 33a side, and semicircular arc shaped joint surface 38c on the first divided holding cylinder portion 34a side A first gasket groove 39 that is open to the first divided joint surface 38 side in a state of being substantially U-shaped when viewed in the joining direction is formed. A first gasket 40 is mounted in the first gasket groove 39 of both the first divided ring bodies 31 to seal the space between the opposed surfaces of the first divided joint surfaces 38 of the first divided ring bodies 31 in a watertight state. Yes. Both fluid pipes 1 including the inner surface of the joint ring 3 including the fitting connection portion 4 and the pipe connection portion 20 having the first gasket groove 39 of both the first divided joint bodies 31 and the first gaskets 40 attached thereto. The first seal portion 41 is configured to seal a part of the surrounding space 42 formed between the outer peripheral surfaces 1a and 2c of the two watertight.

Of the outer peripheral surface of the first split ring body 31 of the first joint ring 30 arranged on the inner fitting side, the region that is the set movable range restricted by the separation movement preventing means 9 is arranged on the outer fitting side. Of the second joint ring 50, a sliding guide portion 44 that slides and guides a fitting and holding portion 55 formed at a fitting side portion to be described later in the tube axis direction.
Further, the fixed connection portion 45 that fixes and connects the first divided joint bodies 31 that are adjacent in the circumferential direction at the outer portion of the sliding guide portion 44 in the tube axis direction is the pipe circumference of the first divided joint bodies 31. It comprises a first connecting flange portion 35 located at both ends in the direction, and fastening means such as a bolt 36 and a nut 37 that fixably connect both the first connecting flange portions 35.

As shown in FIGS. 1 to 4, the second joint ring 50 of the joint ring 3 is externally provided on the receiving port 2 </ b> A side of the fluid pipe 1 so as to surround a range up to the position corresponding to the position of the push ring 22 of the pipe connection portion 20. A second split joint body 51 having a freely split structure is provided. Further, each of the second split ring bodies 51 includes a semi-cylindrical second split peripheral wall part 52a having a larger diameter than the first split peripheral wall part 32a of the first joint ring 30, and a second split peripheral wall part 52a. A semi-annular second divided side wall 53a integrally extending radially inward from one end in the tube axis direction, and an inner diameter side end of the second divided side wall 53a along the tube axis direction. A first half of the first joint ring 30 is provided at the other end in the tube axis direction of the semi-cylindrical second divided holding cylinder portion 54a integrally extending outward and the second divided peripheral wall portion 52a. And a second fitting / carrying tube portion 55a slidably mounted on the peripheral wall portion 32.
The cylindrical second peripheral wall portion 52 of the second joint ring 50 is configured by the second divided peripheral wall portions 52 a of both the second split joint bodies 51. An annular second side wall portion 53 of the second joint ring 5 is configured by the second divided side wall portions 53 a of both the second divided joint bodies 51. In addition, the second split ring 50 attached to the receiving port 2A of the fluid pipe 2 from the outside in the radial direction with the second split holding cylinder portion 54a of both the second split ring bodies 51 is provided. A two-tube holding portion 54 is configured. The fitting ring of the second joint ring 50 slidably fitted to the first peripheral wall part 32 of the first joint ring 30 with the second fitting and holding cylinder part 55a of both the second divided ring bodies 51. A holding portion 55 is configured.

As shown in FIGS. 1 and 2, both ends of the second divided peripheral wall portions 52a of the second divided ring bodies 51 are fixedly connected to each other via fastening means such as bolts 56 and nuts 57. A second connecting flange portion 58 is integrally formed. A fixed connecting portion 64 is configured to fix and connect the second divided joint bodies 51 adjacent to each other in the circumferential direction by using both the second connecting flange portions 58 and fastening means such as bolts 56 and nuts 57.
As shown in FIG. 1, the second split joint surfaces 59 of both the second split ring bodies 51 are connected to the linear joint end surfaces 59a on both ends in the circumferential direction of the second split peripheral wall portion 52a and the linear joint end surfaces 59a. A linear joining end face 59b of the second divided side wall portion 53a orthogonal to each other, a semicircular arc shaped joining surface 59c of the second divided holding cylinder portion 54a, and a semicircular arc shaped joining surface 59d of the second fitting holding cylinder portion 55a It is composed of

Both linear joint end surfaces 59a on the second divided peripheral wall portion 52a side, linear joint end surfaces 59b on the second divided sidewall portion 53a side, semicircular arc shaped joint surfaces 59c on the second divided holding cylinder portion 54a side, A second gasket groove 60 that opens to the second split joint surface 59 side is formed in a region extending in a ring shape when viewed in the joint direction, in a region extending to the semicircular arc joint surface 59d on the side of the two-fitting and holding cylinder portion 55a. ing. A second gasket 61 is mounted in the second gasket groove 60 of both the second split joint bodies 51 to seal the space between the opposing surfaces of the second split joint surfaces 59 of the second split joint bodies 51 in a watertight state. Yes.
The two fluid pipes 1 including the inner surface of the joint ring 3 including the fitting connection portion 4 and the pipe connection portion 20 having the second gasket groove 60 of both the second divided joint bodies 51 and the second gaskets 61 attached thereto. , 2 is formed with a second seal portion 62 that seals the remaining portion of the surrounding space 42 formed between the outer peripheral surfaces 1a and 2c in a watertight manner.

As shown in FIGS. 1 to 4, the first seismic reinforcing metal fitting 7 is divided into two in the pipe circumferential direction, and is fixed to the insertion port 1 </ b> A of one fluid pipe 1 so as to be detachable from the pipe radial direction. A pair of metal split clamping members 70 are provided. As shown in FIGS. 1 and 2, the pair of split clamping members 70 are formed by connecting the flange portions 70 </ b> A provided at both ends in the pipe circumferential direction with bolts 71 and nuts 72, thereby connecting the fluid pipes. It is firmly clamped and fixed to one insertion slot 1A.
The split holding member 70 of the first seismic reinforcement bracket 7 includes a first connecting portion 73 fixedly connected to an extended portion of the first pipe holding portion 34 of the first joint ring 30, and both the fluid pipes 1 and 2. And a first retaining portion 74 that increases the retaining resistance with respect to the outer peripheral surface 1a of the insertion opening 1A of the fluid pipe 1 in accordance with the detachment movement.
The first connecting portion 73 is in the tube radial direction with respect to the annular engaging recess 46 that opens outward in the radial direction and is formed in the extended portion of the first divided holding tube portions 34 a of the first tube holding portion 34. An engagement protrusion 75 is provided that is detachably engaged from the outer side. The engagement protrusions 75 are integrally formed so as to protrude from a plurality of locations in the pipe circumferential direction of the both split clamping members 70 along the tube axis direction.
When the first seismic reinforcement bracket 7 is attached to the insertion opening 1A of the fluid pipe 1, as shown in FIGS. 2 to 4, the engagement protrusions 75 of both split clamping members 70 are connected to the first joint ring 30 side. The joint recess 46 is engaged from the outer side in the pipe radial direction, and in this state, the flange portions 70A of both split clamping members 70 are tightened and connected by bolts 71 and nuts 72.

As shown in FIGS. 3 and 4, the first retaining portion 74 includes a claw storage portion 76 that is formed on the inner peripheral surface of both split clamping members 70 and opens in the radial direction, and the claw storage portion 76. A claw member 77 is housed therein so as to be movable inward in the pipe diameter direction. On the inner surface of the claw member 77, a plurality of sharp tapered blade portions are formed along the tube circumferential direction that can bite into the outer peripheral surface 1a of the insertion slot 1A.
The outer surface of the claw member 77 on the radially outer side of the claw member 77 and the ceiling surface of the claw storage part 76 facing the claw member 77 are in a state of biting into the claw storage part 76 of both split clamping members 70 and the outer peripheral surface 1a of the insertion slot 1A. Along with the relative disengagement movement in the tube axis direction with respect to the claw member 77, the claw member 77 is configured to have an inclined surface that bites and moves inward in the radial direction.

As shown in FIGS. 1 to 4, the second seismic reinforcing metal fitting 8 is divided into two in the pipe circumferential direction, and is detachably fixed to the receiving port 2 </ b> A side of the other fluid pipe 2 from the pipe radial direction. A pair of metal split clamping members 80 are provided. As shown in FIGS. 1 and 2, the pair of split clamping members 80 are formed by connecting the flange portions 80A provided at both ends in the pipe circumferential direction with bolts 81 and nuts 82, thereby connecting the fluid pipes. 2 is firmly clamped and fixed to the receiving port 2A side.
The two split holding members 80 of the second seismic reinforcing metal fitting 8 include a second connecting portion 83 fixedly connected to an extended portion of the second pipe holding portion 54 of the second joint ring 50, and both fluid pipes 1 and 2. And a second retaining portion 84 whose retaining resistance increases with the outer peripheral surface 2c on the receiving port 2A side of the fluid pipe 2 as it moves away.

The second connecting portion 83 of the second seismic reinforcing bracket 8 has the same structure as the first connecting portion 73 of the first seismic reinforcing bracket 7, and the same reference numerals as the first connecting portion 73 are added to the same components. Therefore, the description thereof is omitted.
Moreover, the 2nd securing part 84 of the 2nd seismic reinforcement metal fitting 8 is also the same structure as the 1st securing part 74 of the 1st seismic reinforcement metal fitting 7, and is the same number as the 1st securing part 74 in the same component location. The description is omitted.
Note that the engagement protrusion 75 of the second connecting portion 83 is an annular engagement recess that opens outward in the radial direction and is formed at an extended portion of both the second divided holding cylinder portions 54 a of the second tube holding portion 54. 66 is detachably engaged from the outer side in the tube radial direction.

As shown in FIGS. 1 to 4, the detachment movement preventing means 9 is provided at the tip of the outer peripheral surface of the first divided peripheral wall portion 32 a of both the first divided ring bodies 31. A first detachment prevention portion 90 that protrudes outward in the pipe radial direction toward the inner peripheral surface of the two-part peripheral wall portion 52a is formed. As shown in FIGS. 3 and 4, in the second divided peripheral wall portion 52a of both the second divided ring bodies 51, the first separation preventing portion 90 and the pipe among the partition wall portions that define the second gasket groove 60 are formed. One partition wall portion opposed to each other in the axial direction is configured as the second separation preventing portion 91.
The outer diameter of the first separation preventing portion 90 on the first joint ring 30 side is configured to be larger than the inner diameter of the second separation preventing portion 91 on the second joint ring 50 side, and the first diameter on the first joint ring 30 side. The detachment preventing portion 90 and the second detachment preventing portion 91 on the second joint ring 50 side are configured to be able to contact from the tube axis direction.

When a detachment force due to an earthquake or non-uniform subsidence acts on the pipe connection portion 20 between the insertion opening 1A of one fluid pipe 1 and the receiving opening 2A of the other fluid pipe 2, the first seismic reinforcement metal fitting 7 The first joint ring 30 that is fixed to the first insertion port 1A side is detached and moved integrally with the fluid pipe 1 on the first insertion port 1A side. The second joint ring 50 fixed to the receiving port 2A side of the fluid pipe 2 by the second seismic reinforcing metal fitting 8 moves away from the fluid pipe 2 on the receiving port 2A side integrally. Then, as shown in FIG. 4, when the first joint ring 30 and the second joint ring 50 reach the maximum separation position set by the separation movement preventing means 9, the first separation on the first joint ring 30 side. The blocking portion 90 and the second detachment blocking portion 91 on the second joint ring 50 side are in contact with each other from the tube axis direction, and the fluid pipe 1 on the insertion port 1A side and the fluid pipe 2 on the receiving port 2A side are further separated. Movement is strongly prevented.
In the present embodiment, when the first joint ring 30 and the second joint ring 50 reach the maximum disengagement position, the tip of the insertion port 1A of one fluid pipe 1 slightly slips out from the receiving port 2A of the other fluid pipe 2. Is set to the correct position. Therefore, the fluid leaks from the pipe connecting portions 20 of both fluid pipes 1 and 2, but the leaked fluid only fills the joint ring 3 and does not flow outside.

And when the detachment force resulting from an earthquake, unsettled subsidence, etc. acts on the pipe connection part 20 of both the fluid pipes 1 and 2, the 2nd arrange | positioned on the outer fitting side with the detachment | moving movement of both the fluid pipes 1 and 2. The fitting holding portion 55 at the fitting side portion of the two joint ring 50 is formed on the outer peripheral surface of the first peripheral wall portion 32 of the first joint ring 30 arranged on the inner fitting side, and is a sliding guide with high processing accuracy. Smoothly slides along the portion 44. Thereby, the sealing performance in the circumferential direction of the second seal portion 62 provided in the fitting connection portion 4 is achieved in the entire movement range of the fitting connection portion 4 between the first joint ring 30 and the second joint ring 50. It can be kept constant or substantially constant.
In addition, when the joint ring 3 is inspected after a predetermined period of time has elapsed after the completion of the construction, the fitting connection state between the first joint ring 30 and the second joint ring 50 causes the pipe connection portions 20 of both fluid pipes 1 and 2 to be connected. The separation movement state can be easily estimated.
Therefore, the fluid pipes 1 and 2 on which the joint ring 3 is sheathed by a rational modification such that the joint ring 3 is configured by the first joint ring 30 and the second joint ring 50 that are slidably fitted and connected. It is possible to avoid the influence of rusting or deformation of the outer peripheral surfaces 1a and 2c, and to suppress fluid leakage due to local deterioration in the sealing performance in the circumferential direction of the seal portion. Moreover, since the disengagement movement state of the pipe connecting portions 20 of both fluid pipes 1 and 2 can be easily estimated from the fitting connection state of the first and second joint rings 30 and 50, the pipeline maintenance management It can be obtained as useful information above.

[Second Embodiment]
In the first embodiment described above, the first joint ring 30 disposed on the inner fitting side is externally fixed to the insertion port 1A side of one fluid pipe 1, and the second joint ring 50 disposed on the outer fitting side is disposed on the other side. As shown in FIG. 5, the first joint ring 30 arranged on the inner fitting side is exteriorly fixed to the receiving port 2A side of the other fluid pipe 2, The second joint ring 50 disposed on the outer fitting side may be externally fixed to the insertion port 1A side of one fluid pipe 1.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Third Embodiment]
6 and 7 show a modification of the first joint ring 30 of the first embodiment described above. The first joint ring 30 includes a first split joint body 31 having a two-part structure that can be externally mounted on the insertion opening 1 </ b> A of the fluid pipe 1. Each of the first divided ring bodies 31 is integrally extended radially inward from both ends of the semi-cylindrical first divided peripheral wall portion 32a and the first divided peripheral wall portion 32a in the tube axis direction. Semi-circular first divided side wall 33a, and a semi-cylindrical first divided integrally extending outward from the inner diameter side end of both first divided side wall 33a along the tube axis direction. And a holding cylinder part 34a.
And the cylindrical 1st surrounding wall part 32 in the 1st joining ring 30 is comprised by the 1st division | segmentation surrounding wall part 32a of both the 1st division | segmentation ring bodies 31. As shown in FIG. A pair of annular first side wall portions located on both ends in the tube axis direction of the first joint ring 30 have both first divided side wall portions 33a at both ends in the tube axis direction of the first divided ring bodies 31. 33 is configured. Further, both the first divided holding cylindrical portions 34a at both ends in the tube axis direction of both the first divided ring bodies 31 are radially outward with respect to two locations in the tube axis direction in the insertion port 1A of the fluid pipe 1. A pair of first pipe holding portions 34 that can be packaged in a holding state and are located at both ends of the first joint ring 30 in the axial direction of the pipe are configured.

  A first gasket groove 39 that is annularly continuous when viewed in the joining direction is formed on each of the divided joint surfaces of the first divided joint bodies 31, and the first gasket grooves 39 have both first divided joint bodies. A first gasket 40 that seals between 31 split joint surfaces in a watertight state is mounted. The first gasket groove 39 of both the first split ring bodies 31 and the first gaskets 40 attached thereto are provided between the inner surface of the first joint ring 30 and the outer peripheral surface 1a of the insertion opening 1A of the fluid pipe 1. A first seal portion 41 that seals the formed first surrounding space 43 in a watertight manner is configured.

Of the outer peripheral surface of the first split ring body 31 of the first joint ring 30 arranged on the inner fitting side, the region that is the set movable range restricted by the separation movement preventing means 9 is arranged on the outer fitting side. Of the second joint ring 50, the sliding guide portion 44 that slides and guides the fitting holding portion 55 formed at the fitting side portion in the tube axis direction.
Further, in the outer portion of the sliding guide portion 44 in the tube axis direction, the fixed connection portion 45 that fixes and connects the first divided joint bodies 31 that are adjacent in the circumferential direction is a tube of the first divided joint bodies 31. The first connecting flange portion 35 is located at both ends in the circumferential direction, and fastening means (see FIG. 2) such as a bolt 36 and a nut 37 for fixing and connecting the first connecting flange portions 35.

The outer surface of the first joint ring 30 and the inner surface of the second joint ring 50 have a second gasket groove 60 formed on the split joint surface of both the second split joint bodies 51 and both second gaskets 61 attached thereto. And the 2nd seal part 62 which seals the 2nd surrounding space 47 formed between the outer peripheral surfaces 1a and 2c of both the fluid pipes 1 and 2 including the pipe connection part 20 watertightly is comprised.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.

[Other Embodiments]
(1) In each of the above-described embodiments, the disengagement movement preventing means 9 that prevents the relative disengagement movement of the fluid pipes 1 and 2 from exceeding a certain amount is fitted between the first and second joint rings 30 and 50. Although provided in the connection portion 4, the detachment movement preventing means 9 may be provided between the first joint ring 30 and the pipe connection portion 20 or between the second joint ring 50 and the pipe connection portion 20. .
Further, one of the detachment movement preventing means 9 may be configured as a detachment prevention structure using a bulging portion that protrudes outward in the radial direction at the receiving port 2 </ b> A of the fluid pipe 2.

  (2) In each of the above-described embodiments, when the first joint ring 30 and the second joint ring 50 reach the maximum disengagement position set by the disengagement movement preventing means 9, the inlet 1A of one fluid pipe 1 is inserted. Is set at a position where the distal end of the fluid pipe 2 is slightly removed from the receiving port 2A of the other fluid pipe 2, but the distal end of the insertion opening 1A of one fluid pipe 1 is the other of the maximum separation position set by the separation movement preventing means 9. The fluid pipe 2 may be set at an appropriate position before exiting from the receiving port 2A.

  (3) In the first embodiment described above, the first split joint bodies 31 that are adjacent in the circumferential direction of the first joint ring 30 are connected to the outer end portion that is one end side in the tube axis direction of the sliding guide portion 44. Although the fixed connection part 45 fixedly connected at the position is provided, the first divided joint bodies 31 adjacent to each other in the circumferential direction of the first joint ring 30 are fixedly connected to each other on the tip end side of the first divided peripheral wall part 32a. This may be implemented by adding a fixed connecting portion.

1 Pipe part (fluid pipe)
2 Pipe part (fluid pipe)
3 Joint Ring 4 Fitting Connection 7 First Fixing Means (First Seismic Reinforcement Bracket)
8 Second fixing means (second seismic reinforcement bracket)
9 Separation movement blocking means 20 Pipe connecting part 30 First joint ring 31 First divided joint body 34 Pipe holding part (first pipe holding part)
44 Sliding guide portion 45 Fixed connection portion 50 Second joint ring 51 Second split joint body 62 Seal portion (second seal portion)
64 fixed connecting portion 73 first connecting portion 74 first retaining portion 83 second connecting portion 84 second retaining portion

Claims (5)

Separation structure blocking rings that surround the pipe connection portions of both the pipe portions in a sealed state are covered over the pipe portions, and a detachment movement blocking means for blocking the relative detachment movement of the pipe portions beyond a certain level is provided. It is a structure for preventing the disconnection of the provided pipe connection part,
The joint ring includes a first joint ring that is externally fixed to one of the pipe parts, and a second joint ring that is externally fixed to the other pipe part, and the first joint ring and the second joint ring. The ring is a pipe that is slidably fitted and connected to the tube axis and is provided with a seal portion that slidably seals the fitting connection between the first and second joint rings. Connection prevention structure.   The pipe connection part detachment prevention structure according to claim 1, wherein the detachment movement preventing means is provided at a fitting connection part between the first joint ring and the second joint ring.   The pipe connection according to claim 1 or 2, wherein a pipe holding part that is sheathed on one of the pipe parts is formed at both ends in the pipe axis direction of the first joint ring arranged on the inner fitting side. Departure prevention structure.   The first joint ring includes a first split joint body divided into a plurality in the circumferential direction, the second joint ring includes a second split joint body divided into a plurality in the circumferential direction, and The first joint ring disposed on the inner fitting side includes a sliding guide portion that slides and guides the fitting side portion of the second joint ring disposed on the outer fitting side in the tube axis direction, and the sliding The fixed connection part which fixes and connects the 1st division | segmentation ring bodies adjacent in the circumferential direction in the both outer side parts of the pipe axis direction of a movement guide part is provided in any one of Claims 1-3 provided. Detaching prevention structure for the pipe connection described.   A first connecting portion fixedly connected to an outer end portion of the first joint ring located on a side opposite to a side where the fitting connecting portion is present, and one of the pipe portions as the both pipe portions are moved away from each other. A first retaining portion having a first retaining portion that increases a retaining resistance with respect to the outer peripheral surface of the first and second fixing portions, and further, located on the opposite side to the existence side of the fitting connection portion. The resistance to retaining between the second connecting part fixedly connected to the outer end of the second joint ring and the outer peripheral surface of the other pipe part increases as the both pipe parts move away. The structure for preventing separation of the pipe connecting portion according to any one of claims 1 to 4, wherein a second fixing means having a split structure including a second retaining portion is provided.

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