JP4901393B2 - Detachment prevention structure for pipe joints - Google Patents

Description

  In the present invention, the insertion tube portion is fitted and connected to the receiving tube portion so that the insertion tube portion can be bent within a certain range, and between the opposed surfaces of the outer peripheral surface of the insertion tube portion and the inner peripheral surface of the reception tube portion. The present invention relates to a structure for preventing detachment of a pipe joint portion provided with a sealing means for sealing the pipe.

  Various structures have been proposed as the sealing means. For example, in the cases shown in Patent Documents 1 and 2, between the opposing surfaces of the outer peripheral surface of the insertion tube portion and the large-diameter inner peripheral surface of the reception tube portion. An annular elastic sealing material is attached to the outer tube, and a push ring provided with a pressing portion capable of compressing the elastic sealing material from the tube axis direction is externally mounted on the insertion tube portion, and an end of the outer peripheral surface of the receiving tube portion. Bolts and nuts that pull and fix the flange part and press ring formed in the pipe part in the direction of the tube axis are provided, and the receiving pipe part and the press ring are moved by the relative proximity movement accompanying the tightening and fixing operation by this bolt and nut. At the same time that the sealing material is compressed into a sealed state, both pipe portions are held out in a connected state by the pressure contact force accompanying compression of the elastic sealing material.

  In addition, even in a state of being fastened and fixed by the pusher wheel, the large-diameter inner peripheral surface of the receiving tube portion is configured to have a tapered surface with a larger diameter toward the back side, so that a bending moment caused by an earthquake, non-uniform subsidence, etc. When an external force such as shearing force is applied, the receiving tube portion and the insertion port are within the range of the gap existing between the opposed surfaces of the large diameter inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. When the pipe portion is bent relatively, the external force can be absorbed and damage at the fragile portion of the piping system can be suppressed.

In the past, the following detachment prevention structure has been proposed as a modification method for improving the detachment prevention function in the detachment prevention structure of the pipe joint portion provided with the above-described sealing means.
(1) In the pipe joint part detachment preventing structure shown in Patent Documents 1 and 2, an annular metal inner joint ring extends between the inner peripheral surface of the insertion pipe part and the small-diameter inner peripheral surface of the receiving pipe part. Mounted on both ends of the inner surface joint ring in the axial direction of the tube axis and at a predetermined interval in the circumferential direction, the inner peripheral surface of the insertion tube portion and the small inner diameter surface of the receiving tube portion By biting or screwing into the screw holes formed in the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the reception tube portion, in the tube axis direction between the reception tube portion and the insertion tube portion A fixing bolt for preventing and fixing the relative movement was attached.

Japanese Utility Model Publication No.59-153785 JP-A-10-122465

  In the conventional structure for preventing the separation of the pipe joint portion, the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion are fixedly connected with bolts via an annular inner joint ring. When a large external force such as a tensile force acts on the pipe joint due to uneven settlement, etc., this external force can be received even at the fixed connection between the pipe and the inner joint ring on the pipe inner surface side. Therefore, it is possible to strongly prevent the both pipe portions from moving apart beyond the connection maintaining range. On the other hand, since the outer peripheral surface of the inner surface joint ring is fixedly connected in close contact with the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the reception tube portion, the reception tube portion and the insertion tube portion As a result, the durability against bending moment, shearing force, etc. due to earthquakes, unsettled settlement, etc. has been reduced.

  The present invention has been made in view of the above-described actual situation, and its main problem is a pipe joint portion capable of improving the separation preventing force while maintaining the durability against bending moment, shearing force, etc. as much as possible. It is in the point of providing a structure for preventing the withdrawal.

According to a first characteristic configuration of the present invention, an insertion tube portion is fitted and connected to a receiving tube portion so that the insertion tube portion can be bent within a certain range, and an outer peripheral surface of the insertion tube portion and an inner periphery of the receiving tube portion. A structure for preventing separation of a pipe joint portion provided with a sealing means for sealing between a surface facing the surface,
By engaging engagement members from the tube radial direction over engagement holes formed at a plurality of circumferential positions of the fitting connection portions of the both tube portions, the receiving tube portion and the insertion tube portion are connected to the tube axis. fixing coupling means fixedly connected while preventing relative movement in the direction provided to the fixed coupling means, provided the flexibility means for allowing the bending of the two pipe portions, the flexible means, the outer periphery of the engaging member And an outer peripheral surface of the engaging member in a state in which it can enter the annular space. An elastic coating layer to be coated is provided, and both pipe portions are configured to be bendable within a range of a space that is revealed by elastic deformation of the elastic coating layer.

  According to the above characteristic configuration, when a large external force such as a tensile force is applied to the pipe joint due to an earthquake or uneven settlement, this external force is used to block the relative movement of both pipes in the tube axis direction. Since it can also be received by the fixed connecting means that is fixedly connected in the state, it is possible to strongly prevent the both pipe portions from moving apart beyond the connection maintaining range.

  In addition, since the fixed connecting means is provided with a means for allowing bending of the two pipe portions, when the external force such as a bending moment or a shearing force due to an earthquake or non-uniform subsidence acts, the means for accommodating. When the receiving tube portion and the insertion tube portion are relatively bent within the interchangeable range, it is possible to absorb the external force and suppress breakage at the fragile portion of the piping system.

  Therefore, it is possible to reliably receive a large external force such as a tensile force due to an earthquake or non-uniform subsidence by the fixed connection means, so that the separation prevention performance of both pipe portions can be greatly improved, and the fixed connection The durability against bending moment, shearing force, etc. can be maintained well by the accommodation means provided in the means.

In addition, as long as the engagement member that engages from the tube diameter direction across the engagement hole formed in the fitting connection portion of both the tube portions is not sheared and destroyed, the fixed connection function between the insertion tube portion and the reception tube portion is provided. Since it can maintain strongly, the separation prevention performance of both pipe parts can be improved with a simple structure. In addition, it is only necessary to form a space allowing the bending of both pipe portions between the outer peripheral surface of the engaging member and the inner peripheral surface of at least one of the engaging holes of both pipe portions. As a result, the relative bending function of both pipe portions can be reliably exhibited while reducing the manufacturing cost.

In addition, it is only necessary to form a space allowing the bending of both pipe portions between the outer peripheral surface of the engaging member and the inner peripheral surface of at least one of the engaging holes of both pipe portions. The relative bending function of both pipe portions can be surely exhibited while promoting the reduction in manufacturing cost.

Furthermore, the elastic coating layer attached to the engaging member enters between the outer peripheral surface of the engaging member and the inner peripheral surface of at least one of the engaging holes of the both pipe portions, so that the tube shafts of both the pipe portions are While suppressing backlash in the core direction, when an external force such as a bending moment or a shearing force due to an earthquake or non-uniform subsidence is applied, it is received within the range of the space manifested by the elastic deformation of the elastic coating layer. When the mouth tube portion and the insertion tube portion are bent relatively, it is possible to absorb the external force and suppress breakage at the fragile portion of the piping system.

A second characteristic configuration according to the present invention is that the elastic coating layer is composed of a corrosion-resistant rubber layer coated on at least a portion of the engagement member that comes into contact with the fluid.

  According to the above-described characteristic configuration, while forming the flexibility allowing the bending of both pipe portions between the outer peripheral surface of the engagement member and the inner peripheral surface of at least one of the engagement holes of the both pipe portions, Not only can the backlash of both pipe portions in the direction of the tube axis be suppressed, but also the corrosion of at least the portion of the engaging member that comes into contact with the fluid can be suppressed by configuring the elastic covering layer from a corrosion-resistant rubber layer. be able to.

According to a third characteristic configuration of the present invention, the engaging member is engaged from an outer side in the radial direction of the pipe with respect to an engaging hole formed in a fitting connection portion of both pipe parts. The outer peripheral surface of the tube part is provided with an outer tube sealing means for covering the engagement member in a sealed state with respect to the outside.

  According to the above characteristic configuration, the insertion tube portion and the receiving port are provided as long as the engagement member engaged from the outside in the tube radial direction across the engagement hole formed in the fitting connection portion of the both tube portions is not sheared and destroyed. Not only can the fixed connection function with the pipe part be maintained strongly, but also the fixed connection work of both pipe parts by the engagement member can be performed efficiently and easily from the outside of the pipe, and the outside seal is provided. By means, it is possible to prevent fluid from leaking from the engagement holes of both pipe portions.

According to a fourth characteristic configuration of the present invention, the engagement member is engaged from the inside in the radial direction of the tube with respect to an engagement hole formed in a fitting connection portion of both tube portions. An in-tube sealing means for covering the member in a sealed state with respect to the inside of the tube is provided.
According to the above characteristic configuration, the insertion tube portion and the receiving port are provided as long as the engagement member that engages from the inside in the tube radial direction across the engagement hole formed in the fitting connection portion of the both tube portions is not sheared and destroyed. Not only can the fixed connection function with the pipe portion be maintained strongly, but also fluid can be prevented from leaking to the outside through the engagement holes of both pipe portions, and the engagement by the in-pipe sealing means is possible. Corrosion of the member can be suppressed.

According to a fifth feature of the present invention, there is provided a seal cap in which the tube sealing means is screwed into a male thread portion of an engaging member protruding from a mounting seat surface formed on an outer peripheral surface of the receiving tube portion. And a sealing material for sealing between the mounting seat surface and the end surface of the seal cap opposite to the mounting seat surface.

  According to the above characteristic configuration, the mounting seat surface and the end surface of the sealing cap are screwed into the male thread portion of the engaging member protruding from the mounting seat surface formed on the outer peripheral surface of the receiving pipe portion. It is possible to seal with a sealing material, so there is no need for a special structure for attaching the seal cap, and only the male screw part is formed using the protrusion of the engaging member protruding from the mounting seat surface. Can be implemented with simple and economical modifications.

According to a sixth characteristic configuration of the present invention, the in- pipe sealing means is an elastic sealing layer for sealing at least on the outer peripheral surface side that is mounted across the inner peripheral surface of the insertion tube portion and the inner peripheral surface of the receiving tube portion. It is the point comprised from the annular | circular shaped or substantially annular | circular shaped inner surface band provided with this, and the crimping | compression-bonding means which presses and fixes this inner surface band to the internal peripheral surface of both pipe parts.

  According to the above characteristic configuration, the elastic band sealing layer provided with the inner surface band on at least the outer peripheral surface thereof is applied across the inner peripheral surface of the insertion tube portion and the small inner peripheral surface of the receiving tube portion. By mounting the inner band in this state and pressing and fixing the inner surface band to the inner peripheral surface of the tube by the crimping means, the annular gap between the fitting connection surfaces of both the tube portions can be reliably sealed also from the inner side of the tube.

  In addition, when a large external force such as a tensile force is applied to the pipe joint due to an earthquake or non-uniform settlement, the external force is directly relative to the pipe core in the direction of the pipe axis at the site sealed by the inner band. Since it can also be received by a fixed coupling means that is fixedly coupled in a state in which the movement is prevented, it is possible to strongly prevent the both pipe portions from moving apart beyond the connection maintaining range.

  Therefore, the sealing performance between the fitting connection surfaces of both pipe parts can be reinforced from the inside of the pipe, and a large external force such as a tensile force caused by an earthquake or non-uniform subsidence can be reliably received by the fixed connecting means. Therefore, the separation prevention performance of both pipe parts can be greatly improved. In addition, since the space between the opposing surfaces of the inner peripheral surface of the two pipe portions and the outer peripheral surface of the inner surface band is used, a fixed connection means for fixing and connecting the two pipe portions in a state of preventing relative movement is provided. The means does not overhang on the flow path side, the increase in flow resistance can be suppressed, and the rust prevention treatment of the fixed connection means can be easily performed.

[First Embodiment]
1 to 8 show a structure for preventing detachment of a pipe joint portion used in a piping system for fluid pipes such as water pipes and gas pipes, and a method for strengthening detachment prevention. Synthetic rubber that can seal between the large-diameter inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 is connected to the insertion tube portion 2 of the other connected fluid pipe P ( For example, a sealing material 3 of styrene butadiene rubber) and an example of an annular member fixedly connected to the end of the receiving tube 1 in a state of being fitted around the insertion tube 2, the sealing material 3 is connected to the tube axis X A cast iron push ring 4 that is pressed from the direction and can be compressed to a sealed state (water tight state) is externally provided, and the connection flange portion 4A of the push ring 4 and the connection flange portion 1A of the receiving pipe portion 1 A fastener 5 is provided between the pusher wheel 4 and the receiving tube portion 1 so as to be fastened while being relatively pulled from the tube axis X direction. A sealing means A that seals between the opposing surfaces of the outer peripheral surface 2 a of the insertion tube portion 2 and the large-diameter inner peripheral surface 1 a of the receiving tube portion 1 is configured by the sealing material 3, the push ring 4, and the fastener 5. Yes.

  As shown in FIGS. 1 and 3, the fastener 5 of the sealing means A is connected to bolt insertion holes 5 a formed at a plurality of locations in the circumferential direction of the connecting flange portion 1 A of the receiving pipe portion 1 and the press ring 4. Of the bolt insertion holes 5b formed in a plurality of locations in the circumferential direction of the flange portion 4A, T-shaped bolts 5c inserted across the bolt insertion holes 5a and 5b facing each other in the tube axis X direction, and the bolts 5c The nut 5d is screwed into the projecting screw portion, and the pusher wheel is moved by the relative proximity movement in the tube axis X direction between the pusher wheel 4 and the receiving tube portion 1 in accordance with the tightening operation of the bolt 5c and nut 5d. The seal member 3 is compressed and deformed by a seal pressing portion 4a formed at one end in the tube axis X direction of the tube 4, and the outer peripheral surface 2a of the insertion tube portion 2 and the large-diameter inner peripheral surface 1a of the receiving tube portion 1 At the same time as sealing between the opposite surfaces, the pressure contact force accompanying the compression of the sealing material 3 Thus it retains retaining a receiver pipe portion 1 and the inserted pipe section 2 in the connected state.

  Further, the large-diameter inner peripheral surface 1a of the receiving pipe portion 1 is formed into a tapered surface having a larger diameter toward the smaller-diameter inner peripheral surface 1b side, and the receiving port is received by a pressure contact force accompanying compression of the sealing material 3. Even in a state where the tube portion 1 and the insertion tube portion 2 are held in a connected state, the tapered large-diameter inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 The receiving tube portion 1 and the insertion tube portion 2 are configured to be capable of bending and swinging within a range of an annular space 7 formed between the opposed surfaces.

  An annular inner band 6 that is entirely configured as an elastic sealing layer for sealing is attached across the inner peripheral surface 2b of the insertion tube portion 2 and the small-diameter inner peripheral surface 1b of the receiving tube portion 1. The first crimping tool B1 that presses and fixes one end side of the inner surface band 6 in the tube axis X direction to the inner peripheral surface 2b of the insertion tube portion 2 and the other end side of the inner surface band 6 in the tube axis X direction are the receiving ports. A crimping means B including a second crimping tool B2 that is pressed against and fixed to the small-diameter inner peripheral surface 1b of the tube portion 1 is provided, and both the tube portions 1 and 2 are piped at a portion sealed by the inner surface band 6. Fixed connection means C is provided for fixed connection in a state of preventing relative movement in the axis X direction, and the fixed connection means C prevents relative movement in the axis X direction of both pipe portions 1 and 2. In this state, there is provided interchangeable means S that allows bending and swinging of both pipe portions 1 and 2, and 6 and the first crimping tool B1 and the second crimping tool B2 of the crimping means B in the tube covering the engagement pin 21 as an example of the engagement member constituting the fixed connection means C in a sealed state with respect to the inside of the tube. A sealing means D is configured.

  The accommodation means S sets a relative bending swing between the receiving tube portion 1 and the insertion tube portion 2 when an external force such as a bending moment or a shearing force due to an earthquake or uneven settlement is applied. By allowing the external force to be absorbed, the external force is absorbed to prevent breakage at the fragile portion of the piping system. It may be set to be equal to or smaller than the bending and swinging allowance of both pipe portions 1 and 2.

  As shown in FIGS. 1 to 3, the inner surface band 6 has an outer diameter that is the same or substantially the same as each inner diameter of the inner peripheral surface 2 b of the insertion tube portion 2 and the small inner peripheral surface 1 b of the receiving tube portion 1. The inner peripheral surface 2b of the insertion tube portion 2 from which the mortar lining layer 8 has been peeled and the receiving pipe portion from which the mortar lining layer 8 has been peeled out of the outer peripheral surface of the inner surface band 6. A plurality of semicircular annular ridges 6a protruding outward in the radial direction are integrally formed at a predetermined pitch in the tube axis X direction at each of the portions that are in contact with one small-diameter inner peripheral surface 1b. In addition, annular recesses 6b for mounting the first crimping tool B1 and the second crimping tool B2 are provided on both sides of the inner circumferential surface of the inner surface band 6 corresponding to the annular protrusion 6a in the tube axis direction. Is formed.

  Examples of the viscoelastic polymer material constituting the inner surface band 6 include natural rubber, isopropylene rubber, butadiene rubber, butyl rubber, chloroprene rubber, and nitrile rubber.

  Each of the first crimping tool B1 and the second crimping tool B2 is formed in an annular shape with an outer diameter that is the same as or substantially the same as the inner diameter of the annular recess 6b of the inner surface band 6, as shown in FIGS. In addition, at the both ends of a pair of metal crimping strips 10 that can be elastically deformed in the radial direction (expanded side and reduced diameter side) divided into semicircular shapes in the circumferential direction, A base member 11 having a mounting seat 11a in a direction orthogonal to or substantially orthogonal to a line segment connecting both ends of 10 is fixed, and the mounting seat 11a of each base member 11 is connected to the base member 11 in the direction of the line segment. A mounting plate portion 12B of the connecting member 12 provided with a connecting portion 12A bent in a letter shape is fastened and fixed by a plurality of screws 13.

  A screw hole 14a is formed at the center position in the axial direction and relatively rotatable around the axis parallel to the tube axis X direction across both side plate portions 12a of the connecting portion 12A of each connecting member 12. The support shaft 14 is constructed in a state where the screw directions of the screw holes 14a are set oppositely on both ends of the pressure-bonding band 10, that is, in a state where the screw holes 14a on both ends are set to a right screw and a left screw. Among them, the right screw portion 15a of the connecting bolt 15 that can be expanded to the set maximum diameter expansion range of the both crimped belt-like bodies 10 over the screw holes 14a of the support shafts 14 of both the connecting members 12 adjacent in the circumferential direction and the left A screw portion 15b is screwed together, and a first operation nut 16 and a second operation nut 17 are screwed into each of the right screw portion 15a and the left screw portion 15b of the connecting bolt 15.

  When the connection bolt 15 is rotated, as shown in FIG. 6, the first operation nut 16 and the second operation nut 17 are tightened so as to come into contact with each other from the bolt axis direction and integrated with the connection bolt 15. When the both nuts 16 and 17 are configured as an operation nut for diameter expansion, and when both the crimping strips 10 are expanded to a set diameter expansion value, the first operation nut 16 is supported by the support shaft 14. Then, the second operation nut 17 is tightened and fixed in a state in which the second operation nut 17 is in contact with the first operation nut 16, and the second operation nut 17 is configured as a lock nut.

  As shown in FIG. 7, a through-hole 12c through which the connecting bolt 15 passes is formed in the front plate portion 12b of each connecting portion 12A. The through-hole 12c has the first operating nut 16 and the second operating nut 12c. Even if the relative posture of the connecting bolt 15 changes as the connecting members 12 move away due to the diameter expansion operation of the nut 17, they do not interfere with the connecting bolt 15, in other words, with the moving away of the connecting members 12. 2 and FIG. 5, which is configured as a long hole that allows a change in the relative posture of the connecting bolt 15, and between the adjacent end portions of both the crimped strips 10 and the inner peripheral surface of the inner surface band 6. As described above, as the both connecting members 12 are moved away from each other by the diameter expansion operation of the first operation nut 16 and the second operation nut 17, the inner band 6 corresponds to between the adjacent end portions of the two crimped strips 10. The inner circumference of the intubation tube part 2 Is wear plate 18 made of metal for enhancing the sealing function is provided in pressure contact with the small-diameter inner peripheral surface 1b and 2b or receiver pipe section 1.

  As shown in FIGS. 3 to 5, the fixed connecting means C includes a plurality of circumferential positions in the vicinity of the end of the region where the mortar lining layer 8 is peeled, of the inner peripheral surface 2 b of the insertion tube portion 2. In addition, engagement holes 19 and 20 that communicate with each other in the radial direction are formed at a plurality of locations in the circumferential direction of the large-diameter inner peripheral surface 1a of the receiving pipe portion 1 that are opposed to each other in the radial direction by a drilling device that is carried into the tube. Then, a tapered engagement pin 21, which is an example of an engagement member, is inserted along the tube radial direction from the inside of the tube and held at a predetermined engagement position over the engagement holes 19 and 20 communicating in each radial direction. By doing so, at the site sealed by the inner surface band 6, both the tube portions 1 and 2 are configured to be fixedly connected in a state in which relative movement in the tube axis X direction is prevented.

  When a tensile force acts on the pipe joint due to an earthquake or uneven settlement, the tensile force is applied to the pipe parts 1 and 2 in the direction of the pipe axis X in the portion sealed by the inner surface band 6. Can be received by a plurality of engagement pins 21 of the fixed connection means C that is fixedly connected in a state in which the relative movement of the pipes 1 and 2 is prevented. It is possible to strongly deter the movement to move beyond.

  As shown in FIGS. 3 to 5, the accommodation means S is formed between the outer peripheral surface of each engagement pin 21 and the inner peripheral surfaces of the engagement holes 19 and 20 of both the pipe portions 1 and 2. Furthermore, it is formed between the outer peripheral surface of each engagement pin 21 and the inner peripheral surfaces of the engagement holes 19 and 20 of both the pipe portions 1 and 2, which allows the bending and swinging of both the tube portions 1 and 2. The engagement holes 19 of the two pipe portions 1 and 2 are formed on the outer peripheral surface of each engagement pin 21 except for the inner end surface in the radial direction facing the tube. , 20 and the inner circumferential surface of the engagement pin 21 in a state where it can enter the annular space S formed between the inner circumferential surface and a bottomed portion constituting an anticorrosion rubber layer that is an example of an elastic coating layer that coats the outer circumferential surface of the engagement pin 21 A cylindrical corrosion-resistant rubber cylinder 22 is provided.

  In inserting and holding the engagement pin 21 in the engagement holes 19 and 20, the frictional force between the outer peripheral surface of the engagement pin 21 and the inner peripheral surface of the corrosion-resistant rubber cylinder 22, and the corrosion-resistant rubber cylinder 22. It may be inserted and held by the frictional force between the outer peripheral surface of the inner surface and the inner peripheral surfaces of the engagement holes 19 and 20, but the anticorrosion rubber cylinder 22 is inserted and held by using an elastic holding force by slightly compressing it. Also good.

  A corrosion-resistant rubber cylinder 22, which is an elastic coating layer attached to the engagement pin 21, is between the outer peripheral surface of the engagement pin 21 and the inner peripheral surfaces of the engagement holes 19 and 20 of both the pipe portions 1 and 2. When the external force such as a bending moment or a shearing force due to an earthquake or a non-uniform subsidence is applied while suppressing backlash in the tube axis X direction of both pipe portions 1 and 2 by entering, the engagement pin In the range of the space S which appears when the anticorrosion rubber cylinder 22 is elastically deformed between the outer peripheral surface of 21 and the inner peripheral surfaces of the engagement holes 19 and 20 of both tube portions 1 and 2, the receiving tube When the portion 1 and the insertion tube portion 2 are relatively bent and oscillated, the external force can be absorbed and damage at the fragile portion of the piping system can be suppressed.

Next, a method for enhancing the prevention of detachment of the pipe joint portion configured as described above will be briefly described.
(1) The insertion tube portion 2 of the other fluid tube P is inserted and connected to the reception tube portion 1 of the one fluid tube P having a diameter that allows a person to enter and work, and the outer peripheral surface 2a of the insertion tube portion 2 In the pipe joint portion in which the space between the facing surface of the receiving pipe portion 1 and the large-diameter inner peripheral surface 1a is sealed by the sealing means A, an operator enters the water-cut pipe, Of the mortar lining layer 8 formed on the peripheral surface 2b and the small-diameter inner peripheral surface 1b of the receiving pipe portion 1, a predetermined region in contact with the inner surface band 6 is peeled over the entire periphery.
(2) Among the inner peripheral surface 2b of the insertion tube portion 2, a plurality of circumferential locations in the vicinity of the end of the lining layer peeling region, and a large-diameter inside of the receiving tube portion 1 opposed to each other in the radial direction Engagement holes 19 and 20 communicating in the radial direction are formed at a plurality of locations in the circumferential direction of the peripheral surface 1a by the punching device carried into the pipe, and the corrosion-resistant rubber is formed over the engagement holes 19 and 20 communicating in the respective radial directions. The engaging pin 21 to which the bottomed cylindrical corrosion-resistant rubber cylinder 22 constituting the layer is attached is inserted and held, and fixed coupling means C constituted by the engaging holes 19, 20 and the engaging pin 21. The two pipe parts 1 and 2 are fixedly connected in a state in which relative movement in the direction of the pipe axis X is prevented at the portion sealed by the inner surface band 6.
(3) The whole is configured as an elastic sealing layer for sealing over the inner peripheral surface 2b of the insertion tube portion 2 from which the mortar lining layer 8 is peeled off and the small-diameter inner peripheral surface 1b of the receiving tube portion 1. The annular inner band 6 is mounted in a sealed state with a plurality of annular ridges 6a formed integrally protruding at a predetermined pitch on both sides of the outer peripheral surface in the tube axis X direction.
(4) Components of the first crimping tool B1 and the second crimping tool B2 that can be individually expanded in diameter in the annular recesses 6b formed on both sides of the inner circumferential surface of the inner surface band 6 in the tube axis X direction. Thus, a pair of metal pressure-bonding strips 10 that are elastically deformable in the radial direction (expanded side and reduced diameter side) divided into two in the circumferential direction, the adjacent end portions of both the pressure-bonded band-shaped members 10 and the inner surface band 6 are used. The connecting member 12 is mounted in a state where a metal backing plate 18 is interposed between the inner peripheral surface of each of the crimping belts 10 and fixed in a state of projecting outward in the radial direction near both ends of each crimped strip 10. The right screw portion 15a and the left screw portion 15b of the connection bolt 15 that can be expanded to the set maximum diameter expansion range of the pressure-bonding band 10 over the shaft 14 are screwed together, and the right screw portion 15a of the connection bolt 15 and A first operation nut 16 and a second nut 17 screwed into the left screw portion 15b By rotating to the enlarged diameter side, one end side of the inner surface band 6 in the tube axis X direction is connected to the inner circumference of the insertion tube portion 2 by the both crimped strips 10 and the contact plate 18 of the first crimping tool B1 whose diameter is expanded. The other end side in the tube axis X direction of the inner surface band 6 of the inner surface band 6 is fixed to the surface 2b of the inner surface band 6 by both the pressure-bonding band-like body 10 and the contact plate 18 of the second pressure-bonding tool B2 having a diameter increased. A small diameter inner peripheral surface 1b is pressed and fixed in a sealed state.

  In the first embodiment, the inner peripheral surfaces of the engagement holes 19 and 20 of the pipe portions 1 and 2 are disposed on the outer peripheral surface of the engagement pin 21 except for the inner end surface in the tube radial direction facing the tube. In the state where it can enter the annular space S formed between the surface and the surface, it is covered with the corrosion-resistant rubber cylinder 22 constituting the corrosion-resistant rubber layer which is an example of the elastic coating layer. The circumference may be covered with a corrosion-resistant rubber layer 22 constituting a corrosion-resistant rubber layer which is an example of an elastic coating layer.

  In the first embodiment described above, the anticorrosion rubber layer 22 may be fixed to the outer peripheral surface of the engagement pin 21 with an adhesive or the like. You may fix to the inner peripheral surface of the joint holes 19 and 20 with an adhesive agent.

[Second Embodiment]
FIG. 9 shows a modified example of the first embodiment, in which the accommodation means S that allows bending and swinging of both the tube portions 1 and 2 is connected to the outer peripheral surface of the engagement pin 21 and the both tube portions 1 and 2. Accommodating the bending and swinging of both tube portions 1 and 2 formed between the inner peripheral surfaces of the joint holes 19 and 20, that is, engaging the outer peripheral surface of the engagement pin 21 and both tube portions 1 and 2. A portion of the outer peripheral surface of the engagement pin 21 that enters into the engagement hole 20 of the insertion tube portion 2 while being formed of an annular space formed between the inner peripheral surfaces of the joint holes 19 and 20. In this case, the outer peripheral surface of the engagement pin 21 is covered with the elastic surface so as to be able to enter the annular space S formed between the inner peripheral surface of the engagement hole 20 and the outer peripheral surface of the engagement pin 21. A corrosion-resistant rubber cylinder 25 constituting a corrosion-resistant rubber layer that is an example of the coating layer is provided.

In the second embodiment, when an external force such as a bending moment or a shearing force due to an earthquake or non-uniform subsidence is applied, the inner peripheral surface of the engagement hole 19 and the outer periphery of the engagement pin 21 are received. The corrosion-resistant rubber cylinder 25 is elastically deformed between the space S formed between the surface and the inner peripheral surface of the engagement hole 20 of the insertion tube portion 2 and the outer peripheral surface of the engagement pin 21. The receiving pipe portion 1 and the insertion pipe portion 2 are relatively bent and oscillated within the range of the space S that is exposed by the above, so that the external force is absorbed and damage at the fragile portion of the piping system is suppressed. can do.
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]
FIG. 10 shows a modified example of the first embodiment, in which the accommodation means S that allows bending and swinging of both the tube portions 1 and 2 is connected to the outer peripheral surface of the engagement pin 21 and the both tube portions 1 and 2. Accommodating the bending and swinging of both tube portions 1 and 2 formed between the inner peripheral surfaces of the joint holes 19 and 20, that is, engaging the outer peripheral surface of the engagement pin 21 and both tube portions 1 and 2. A portion of the outer peripheral surface of the engagement pin 21 that enters into the engagement hole 19 of the receiving pipe portion 1 while being formed of an annular space formed between the inner peripheral surfaces of the joint holes 19 and 20. In this case, the outer peripheral surface of the engagement pin 21 is covered with the elastic material so as to be able to enter the annular space S formed between the inner peripheral surface of the engagement hole 19 and the outer peripheral surface of the engagement pin 21. A bottomed cylindrical corrosion-resistant rubber cylinder 26 constituting a corrosion-resistant rubber layer which is an example of the coating layer is provided.

In the third embodiment, when an external force such as a bending moment or a shearing force due to an earthquake or non-uniform settlement acts, the inner peripheral surface of the engagement hole 20 of the insertion tube portion 2 and the outer periphery of the engagement pin 21 are applied. The corrosion-resistant rubber cylinder 26 is elastically deformed between the space S formed between the inner surface and the inner peripheral surface of the engaging hole 19 of the receiving pipe portion 1 and the outer peripheral surface of the engaging pin 21. The receiving pipe portion 1 and the insertion pipe portion 2 are relatively bent and oscillated within the range of the space S that is exposed by the above, so that the external force is absorbed and damage at the fragile portion of the piping system is suppressed. can do.
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.

[Fourth Embodiment]
In the first embodiment described above, an example of an engagement member is provided over the engagement holes 19 and 20 formed in the inner peripheral surface 2b of the insertion tube portion 2 and the large-diameter inner peripheral surface 1a of the reception tube portion 1. Although a certain taper-shaped engagement pin 21 is configured to be inserted and held along the tube radial direction from the inside of the tube so that both the tube portions 1 and 2 are fixedly connected to each other at the site sealed by the inner surface band 6, As shown in FIG. 11, an engagement hole 19 on the side of the insertion tube portion 2 is formed in a screw hole 28, and a rotation operation portion 29 a such as a hexagonal hole which is an example of an engagement member is formed in the screw hole 28. By screwing the fixing screw 29 provided, the pipe parts 1 and 2 are configured to be fixedly connected in a state where relative movement in the pipe axis X direction is restricted at a portion sealed by the inner surface band 6. Also good.

In the fourth embodiment, the engagement hole 19 on the receiving tube portion 1 side is configured to have a larger diameter than the screw hole 28 on the insertion tube portion 2 side, and the outer peripheral surface of the fixing screw 29 is formed. And an inner circumferential surface of the fixing screw 25 and an inner circumferential surface of the large-diameter engaging hole 19 with an annular space S formed between the inner circumferential surface of the large-diameter engaging hole 19 on the receiving tube portion 1 side. The accommodation means S is configured to allow bending and swinging of the tube portions 1 and 2 formed between the two.
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.

[Fifth Embodiment]
FIGS. 12 and 13 show a modification of the first embodiment, which constitutes a fixed connecting means C for fixing and connecting the pipe parts 1 and 2 in a state of preventing relative movement in the tube axis X direction. Further, at a plurality of locations in the circumferential direction near the end of the outer peripheral surface 2a of the insertion tube portion 2 and at a plurality of locations in the circumferential direction of the large-diameter inner peripheral surface 1a of the receiving tube portion 1 that are opposed to each other in the radial direction. The engagement holes 31 and 32 communicating from the radially outer side are formed by a punching device installed outside the pipe, and the engagement hole 32 on the receiving pipe part 1 side is formed in the screw hole by screw machining. In addition, the engagement portion 33 </ b> A that engages with the engagement hole 31 of the insertion tube portion 2, which is an example of an engagement member, extends between the screw hole 32 and the engagement hole 31 that communicate with each other in the radial direction. A threaded male member 33B and a threaded member 33 that is threaded from the outside of the tube along the tube radial direction. By holding the tube in place, both the tube portions 1 and 2 are configured to be fixedly connected in a state in which relative movement in the tube axis X direction is restricted, and further to the outer peripheral surface 1c of the receiving tube portion 1 Is provided with a tube sealing means E that covers the screw member 33 in a sealed state with respect to the outside.
The outer sealing means E includes a seal cap 34 screwed into a male thread portion 33B of a screw member 33 protruding from a mounting seat surface 1d formed on the outer peripheral surface 1c of the receiving tube portion 1, and the mounting A seal material 35 is provided for sealing between the seat surface 1d and the end surface of the seal cap 34 opposite to the seat surface 1d.

  Of the screw member 33, the engaging portion 33 </ b> A that enters the engaging hole 31 of the insertion tube portion 2 includes an inner peripheral surface of the engaging hole 31 and an outer peripheral surface of the engaging portion 33 </ b> A of the screw member 33. A corrosion-resistant rubber cylinder 36 that constitutes a corrosion-resistant rubber layer that is an example of an elastic coating layer that coats the outer peripheral surface of the locking portion 33A of the screw member 33 in a state where it can enter the annular space S formed therebetween. Is provided.

  In the fifth embodiment, when an external force such as a bending moment or a shearing force due to an earthquake or non-uniform settlement acts, the engagement between the inner peripheral surface of the engagement hole 31 of the insertion tube portion 2 and the screw member 33 is performed. Between the outer peripheral surface of the portion 33A, the receiving tube portion 1 and the insertion tube portion 2 are relatively bent and oscillated within the space S that appears when the corrosion-resistant rubber cylinder 36 is elastically deformed. Thereby, the said external force can be absorbed and the damage in the weak part of a piping system can be suppressed.

  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.

[Sixth Embodiment]
FIG. 14 and FIG. 15 show another embodiment of the structure for preventing the separation of the pipe joint portion, which is arranged at a plurality of locations at predetermined intervals in the circumferential direction of the inner peripheral surface 2b of the insertion tube portion 2 on the inner side of the tube. Are formed in a plurality of locations at predetermined intervals in the circumferential direction of the small-diameter inner peripheral surface 1b of the receiving tube portion 1, and screw holes 41 extending in the radial direction from the tube inner side are formed. Each of the both ends of the metal joint plate 42 in the tube axis X direction that can be disposed over the inner peripheral surface 2b of the insertion tube portion 2 and the small-diameter inner peripheral surface 1b of the receiving tube portion 1 is formed. A screw hole 42a into which a bolt 43, which is an example of an engaging member, can be screwed is formed, and the screw hole 41 of the receiving tube portion 1 is screwed into one screw hole 42a of the joining plate 42. In the state where the relative movement in the tube axis X direction is restricted by screwing and fixing 43 to the receiving tube portion 1 and the insertion tube portion 2. Have configured fixed coupling means C for constant connection.

A front end portion of a bolt 43 screwed into the other screw hole 42 a of the joining plate 42 is engaged in the engagement hole 40 of the insertion tube portion 2, and the inner diameter of the engagement hole 40 is set to the bolt 43. The bolt 43 has an annular space S formed between the outer peripheral surface of the bolt 43 and the inner peripheral surface of the engagement hole 40 on the receiving pipe portion 1 side. Between the outer peripheral surface of the engagement hole 40 and the inner peripheral surface of the engagement hole 40, the accommodation means S that allows bending and swinging of the pipe portions 1 and 2 is configured.
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 inner surface band 6 that is entirely configured as an elastic sealing layer for sealing is used. However, for the sealing on the outer peripheral surface of a metal annular mounting base material. What formed the elastic sealing layer of may be used.
The inner surface band 6 may be an annular one having an elastic sealing layer for sealing at least on the outer peripheral surface side.
(2) As said sealing means A, it is between the opposing surfaces of the large-diameter inner peripheral surface 1a of the receiving tube part 1 and the outer peripheral surface 2a of the insertion tube part 2 inserted and connected to this from the tube axis X direction. Any sealing structure may be adopted as long as it can be sealed.
(3) In the above-described embodiment, the crimping means B that presses and fixes the inner surface band 6 against the inner peripheral surfaces 1b and 2b of the pipe portions 1 and 2 is inserted into one end side of the inner surface band 6 in the tube axis X direction. A first pressure-bonding tool B1 that is pressed and fixed to the inner peripheral surface 2b of the pipe part 2, and a second pressure-bonding that presses and fixes the other end side of the inner surface band 6 in the tube axis X direction to the small-diameter inner peripheral surface 1b of the receiving pipe part 1. Although it is configured from the tool B2, it may be configured to simultaneously press and fix the both sides of the inner band 6 in the tube axis X direction to the inner peripheral surfaces 1b and 2b of both the tube parts 1 and 2 with one crimping tool. .
(4) The fixed connecting means C is not particularly limited as long as both pipe portions 1 and 2 can be fixedly connected from the tube inner side or the tube outer side while preventing relative movement in the tube axis X direction. It may be configured in a structure.
(5) Any structure may be used as the accommodation means S as long as the accommodation means S is provided with the accommodation that allows the bending of the pipe portions 1 and 2 in a state where the fixed connection means C is fixedly connected. You may comprise.

1 is a cross-sectional side view of an entire embodiment showing a first embodiment of a structure for preventing detachment of a pipe joint portion and a method for strengthening detachment prevention according to the present invention. Overall cross-sectional front view Enlarged cross-sectional side view of the main part Enlarged cross-sectional side view of the main part when bent within the range of accommodation Enlarged sectional front view of crimping means Enlarged plan view of crimping means VII-VII line sectional view in FIG. VIII-VIII line sectional view in FIG. The expanded sectional side view of the principal part which shows 2nd Embodiment of this invention The expanded sectional side view of the principal part which shows 3rd Embodiment of this invention The expanded sectional side view of the principal part which shows 4th Embodiment of this invention The expanded sectional side view of the principal part which shows 5th Embodiment of this invention Exploded side view of main parts The expanded sectional side view of the principal part which shows 6th Embodiment of this invention Enlarged view of the joining plate

Explanation of symbols

A Sealing means B Crimping means C Fixed connecting means D In-pipe sealing means E Out-pipe sealing means S Flexible means (flexibility, space)
X tube shaft core 1 receiving tube portion 1a large diameter inner peripheral surface 1b small diameter inner peripheral surface 1c outer peripheral surface 1d mounting seat surface 2 insertion tube portion 2a outer peripheral surface 2b inner peripheral surface 3 sealing material 6 inner surface band 19 engagement hole 20 Engagement hole 21 Engagement pin (engagement member)
22 Corrosion-resistant rubber cylinder (elastic coating layer, corrosion-resistant rubber layer)
25 Corrosion-resistant rubber cylinder (elastic coating layer, corrosion-resistant rubber layer)
26 Corrosion-resistant rubber cylinder (elastic coating layer, corrosion-resistant rubber layer)
33 Screw member (engagement member)
33A Locking part 33B Male thread part 34 Seal cap 35 Sealing material 36 Corrosion resistant rubber cylinder (elastic coating layer, corrosion resistant rubber layer)
40 engaging hole 41 screw hole 42 joining plate 43 bolt (engaging member)

Claims (6)

Sealing that fits and connects the insertion tube portion to the receiving tube portion so that the insertion tube portion can be bent within a certain range, and seals the space between the outer peripheral surface of the insertion tube portion and the inner peripheral surface of the reception tube portion. A structure for preventing detachment of a pipe joint portion provided with means,
By engaging engagement members from the tube radial direction over engagement holes formed at a plurality of circumferential positions of the fitting connection portions of the both tube portions, the receiving tube portion and the insertion tube portion are connected to the tube axis. fixing coupling means fixedly connected while preventing relative movement in the direction provided to the fixed coupling means, provided the flexibility means for allowing the bending of the two pipe portions, the flexible means, the outer periphery of the engaging member together constitute an annular space formed between at least one of the inner peripheral surface of the engaging hole on the surface and Ryokan portion, the outer peripheral surface of the engaging member in a state capable enter the said annular space An anti-detachment structure for a pipe joint portion provided with an elastic covering layer to be covered and configured so that both pipe portions can be bent within a space defined by elastic deformation of the elastic covering layer. The pipe joint portion detachment preventing structure according to claim 1 , wherein the elastic coating layer is a corrosion-resistant rubber layer coated on at least a portion of the engagement member that comes into contact with the fluid. The engaging member is engaged from the outside in the pipe radial direction with respect to an engaging hole formed in a fitting connection portion of both pipe parts, and the engagement pipe is provided on the outer peripheral surface of the receiving pipe part. 3. The pipe joint portion detachment preventing structure according to claim 1 or 2, further comprising an outer tube sealing means for covering the joint member in a sealed state with respect to the outside. The engaging member is engaged from the inside in the radial direction of the pipe with respect to the engaging hole formed in the fitting connection portion of both pipe parts, and the engaging member is sealed with respect to the inside of the pipe. 3. A structure for preventing the separation of a pipe joint portion according to claim 1 or 2, further comprising an in-tube sealing means for covering. A seal cap screwed into a male thread portion of an engaging member projecting from a mounting seat surface formed on an outer peripheral surface of the receiving tube portion; The pipe joint part detachment preventing structure according to claim 3, further comprising a sealing material for sealing between the end face of the sealing cap. The in-tube sealing means has an annular or substantially annular shape provided with an elastic sealing layer for sealing at least on the outer peripheral surface side mounted across the inner peripheral surface of the insertion tube portion and the inner peripheral surface of the receiving tube portion. The structure for preventing separation of a pipe joint portion according to claim 4, comprising an inner surface band and a crimping means for pressing and fixing the inner surface band to the inner peripheral surfaces of both pipe portions.

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