JP2007113644A - Disengagement prevention structure of pipe joint and disengagement prevention enhancement method of pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve sealing performance and disengagement prevention force by using the inner peripheral surface side of a pipe. <P>SOLUTION: In the disengagement prevention structure, a seal member 11 is attached to a space between confronting surfaces of an inner peripheral surface 2b of an insertion pipe part 2 and a small diameter inner peripheral surface 1b of a receiving pipe part 1 and both ends of an outer peripheral surface 10a of an inner surface connecting ring 10 attached to them. A compression operation means B is provided for compressing the respective seal members 11 in a sealed state from a pipe axis direction, and a first lock member 12 and a second lock member 13 are fixed on the inner peripheral surface 2b of the insertion pipe part 2 and the small diameter inner peripheral surface 1b of the receiving pipe part 1. A first disengagement restricting part 14 for preventing disengagement of the both pipe parts 1 and 2 by being abutted to the first lock member 12 from one side of the pipe axis direction and a second disengagement restricting part 15 for preventing disengagement of the both pipe parts 1 and 2 by being abutted to the second lock member 13 from the other side of the pipe axis direction are formed on the outer peripheral surface 10a of the inner surface connecting ring 10 in the state that a movable space S for allowing relative movement of the both pipe parts 1 and 2 along the pipe axis direction in the connection maintenance range is provided. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe joint part detachment preventing structure and a pipe provided with a sealing means for sealing a space between an outer peripheral surface of an insertion tube portion and a large-diameter inner peripheral surface of a receiving tube portion to which the insertion tube portion is inserted and connected. The present invention relates to a method for enhancing the prevention of detachment of joint parts.

  Various structures have been proposed as the sealing means. For example, in the case shown in Patent Document 2, a circle is provided 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, and a push ring provided with a pressing portion capable of compressing the elastic sealing material from the tube axis direction is externally attached to the insertion tube portion, and at the end of the outer peripheral surface of the receiving tube portion. Bolts and nuts that pull and fix the formed flange part and press ring in the direction of the pipe axis are provided, and an elastic seal material is provided by the relative proximity movement between the receiving pipe part and the press ring in accordance with the tightening and fixing operation by the bolt and nut. Are compressed in a sealed state, and at the same time, both pipe portions are held in a connected state.

  Moreover, in the case of the sealing means shown in Patent Document 1, a yarn for leakage prevention is wound around the distal end side of the outer peripheral surface of the insertion tube portion, and the radially outer side of the large-diameter inner peripheral surface of the reception tube portion is provided. An annular groove is formed that is recessed in the direction of the pipe, and lead is connected between the opposing surfaces of the outer peripheral surface of the insertion tube portion and the large-diameter inner peripheral surface of the receiving tube portion, thereby connecting both tube portions. Holds in place.

In the past, the following two detachment prevention structures have been proposed as a modification method for improving the sealing performance and the detachment prevention function in the detachment prevention structure for a pipe joint provided with the above-described sealing means.
(1) In the pipe joint part detachment preventing structure shown in Patent Document 1, an annular metal inner joint ring is mounted over the inner peripheral surface of the insertion pipe part and the small-diameter inner peripheral surface of the receiving pipe part. , Between the opposing surface of the outer peripheral surface of the inner surface joint ring in the tube axis direction and the inner peripheral surface of the insertion tube portion, and the other end portion in the tube axis direction of the outer surface of the inner surface joint ring and the receiving tube portion A sealing material is attached to each of the opposed surfaces of the inner diameter surface of the inner diameter of the inner diameter joint, and a pressing portion capable of compressing the elastic sealing material from the tube axis direction is provided at both ends in the tube axis direction of the inner joint ring. The elastic seal material is compressed into a sealed state by the relative proximity movement of the inner joint ring and the press ring in accordance with the tightening and fixing operation with the bolt and nut, and at the same time, the inside of the inlet tube portion The inner surface joint ring is held at a predetermined position extending between the peripheral surface and the small-diameter inner peripheral surface of the receiving pipe portion.
In addition, a plurality of bolts that can be swallowed from the radially inner side are screwed onto the inner peripheral surface of the insertion tube portion at a plurality of locations in the circumferential direction of the push ring on the insertion tube portion side, and the reception tube Bolts that can be swallowed from the radially inner side are screwed onto the small-diameter inner peripheral surface of the receiving tube portion at a plurality of locations in the circumferential direction of the push ring on the portion side.

(2) In the structure for preventing the disconnection of the pipe joint portion shown in Patent Document 2, the annular connection between the fitting connection surfaces of both pipe portions extends over the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion. A crimping operation as a first crimping means capable of expanding the diameter by attaching a rubber inner band capable of sealing the gap and pressing and fixing one end of the inner band in the tube axis direction against the inner peripheral surface of the insertion tube portion. A fitting and a crimping operation fitting as a second crimping means capable of expanding the diameter by pressing and fixing the other end side in the tube axis direction of the inner surface band to the small-diameter inner peripheral surface of the receiving tube portion are provided.

Japanese Utility Model Publication No.59-153793 Japanese Utility Model Publication No. 60-65497

  In the former (1) structure for preventing the separation of the pipe joint part, between the opposing surfaces of the pipe joint in the axial direction of the inner joint and the inner peripheral surface of the insertion pipe part and the small-diameter inner peripheral surface of the receiving pipe part. Since the installed sealing material can seal the annular gap between the fitting connection surfaces of both pipe portions from the inside of the pipe, the sealing performance can be improved. In addition, the position holding force by compressing the sealing material with a push ring and the position holding force by the biting action of the bolt on the push ring side with respect to the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the receiving tube portion. The effect of preventing separation can be enhanced.

  However, when a tensile force acts on the pipe joint due to an earthquake or uneven settlement, etc., there is no function to absorb this tensile force, so the effect of suppressing breakage in the fragile part of the piping system cannot be expected, Moreover, it was not possible to obtain a detachment preventing force sufficient to counter a large tensile force acting due to an earthquake or the like only by the position holding force due to the compression action of the sealing material and the bolt biting action.

With the latter (2) structure for preventing the detachment of the pipe joint part, crimping operation is performed on both sides of the inner side band of the inner band attached over the inner peripheral surface of the insertion tube part and the small diameter inner peripheral surface of the receiving pipe part. By pressing and fixing to the inner peripheral surface of the pipe with the metal fitting, the annular gap between the fitting connection surfaces of both pipe portions can be sealed from the inner side of the pipe, so that the sealing performance can be improved.
However, by simply pressing and fixing each of the inner side bands of the inner band to the inner peripheral surface of the tube with a crimping operation fitting, it is possible to obtain a separation prevention force that can resist the large tensile force that acts due to earthquakes, etc. I couldn't.

  The present invention has been made in view of the above-described actual situation, and its main problem is a pipe joint portion that can improve the sealing performance and the separation prevention force by utilizing the pipe inner peripheral surface side. It is in the point which provides the removal prevention reinforcement | strengthening structure of this, and the prevention prevention reinforcement | strengthening method of a pipe joint part.

According to a first characteristic configuration of the present invention, there is provided sealing means for sealing a space between the outer peripheral surface of the insertion tube portion and a large-diameter inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected, and the insertion port A ring-shaped inner surface joint ring is mounted over the inner peripheral surface of the pipe portion and the small-diameter inner peripheral surface of the receiving tube portion, and one end portion in the tube axis direction of the outer peripheral surface of the inner surface joint ring and the inner periphery of the insertion tube portion A pipe joint portion in which a sealing material is mounted between the opposite surfaces of the inner surface and between the opposite surfaces of the outer peripheral surface of the inner surface joint ring in the tube axis direction and the small-diameter inner peripheral surface of the receiving pipe portion. Is a structure for preventing the withdrawal of
Compression operation means is provided to hold the inner joint ring in a predetermined position across the inner peripheral surfaces of both pipe portions by compressing each of the sealing materials in a sealed state from the tube axis direction, and located between the two sealing materials. A first lock member and a second lock member projecting radially inward are fixed to the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion, and the outer peripheral surface of the inner joint ring A first detachment restricting portion that prevents the detachment of both tube portions by contacting the first lock member from one side in the tube axis direction, and a tube axis with respect to the second lock member. A movable space that allows relative movement in the tube axis direction of both pipe portions within the connection maintaining range is provided with a second detachment restricting portion that prevents the detachment of both pipe portions by contacting from the other side of the direction. It is in the point formed in the state.

According to the above-described characteristic configuration, the seal material mounted between the opposing surfaces of both the end portions in the tube axis direction of the inner surface joint ring and the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion is compressed. By compressing in the sealed state from the tube axis direction by the operating means, the annular gap between the fitting connection surfaces of both pipe portions can be sealed from the inside of the pipe, and the pressure contact force accompanying the compression of the both seal materials Thus, the inner joint ring can be held at a predetermined position over the inner peripheral surfaces of both pipe portions.
Moreover, both locking members formed on both sides of the outer peripheral surface of the inner surface joint ring in the tube axis direction, both locking members fixed to the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the receiving tube portion; Since a movable space is provided between the pipes, when a tensile force is applied to the pipe joint due to an earthquake, non-uniform subsidence, etc., the tensile force is absorbed by the relative separation movement of both pipes in the movable space. If the relative separation movement cannot be absorbed, the first locking member fixed to the inner peripheral surface of the insertion tube portion and the first separation restricting portion of the inner joint ring from the tube axis direction can be applied. Or the contact between the second locking member fixed to the small-diameter inner peripheral surface of the receiving pipe part and the second separation regulating part of the inner surface joint ring from the tube axis direction, or the contact of both of them, It is possible to strongly prevent 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 is absorbed as much as possible. If the breakage at the fragile portion can be suppressed and the external force cannot be absorbed by the relative separation movement of the two pipe portions, the first and second lock members on the both pipe portions side and the first on the inner joint ring side -By contact | abutting with a 2nd detachment | leave control part, detachment | leave of both pipe parts can be blocked | prevented strongly.
Furthermore, since the first and second lock members are fixed to the inner peripheral surface side of both pipe portions by utilizing the space between the opposing surfaces of the inner peripheral surfaces of the pipe portions and the outer peripheral surface of the inner surface joint ring, The first and second lock members do not protrude to the flow path side, an increase in flow resistance can be suppressed, and the first and second lock members can be easily rust-proofed.

  According to a second characteristic configuration of the present invention, the first lock member and the second lock member peel off the lining layer formed on the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion. It is in the point fixed to the part.

  According to the above characteristic configuration, rattling is unlikely to occur in the fixing portion between the inner peripheral surface of the insertion tube portion and the first locking member and the fixing portion between the small-diameter inner peripheral surface of the receiving tube portion and the second locking member. It is possible to strongly prevent the detachment of both pipe parts.

  According to a third characteristic configuration of the present invention, the first lock member and the second lock member are screwed into screw holes formed in the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the receiving tube portion. And the outer peripheral surface of the inner surface joint ring is formed as a loosening prevention regulating surface positioned in the vicinity of the head of the screw member fixed by screwing.

According to the above characteristic configuration, the screw member shears the fixing function between the inner peripheral surface of the insertion tube portion and the first lock member and the fixing function between the small-diameter inner peripheral surface of the receiving tube portion and the second lock member. Since it can be kept strong as long as it is not destroyed, it is possible to strongly prevent separation of both pipe parts.
In addition, the screw member that is screwed and fixed using the outer peripheral surface of the inner joint ring can be prevented from loosening, so that a strong detachment prevention function for both pipe parts can be ensured over a long period of time while simplifying the structure. Can be demonstrated.

  According to a fourth characteristic configuration of the present invention, the screw hole on the insertion tube portion side is formed in a penetrating state from the radially inner side, and the screw hole on the receiving tube portion side has a large diameter inside. A thick bent pipe portion from the peripheral surface to the small-diameter inner peripheral surface is formed in a non-penetrating state from the inside in the radial direction.

  According to the above characteristic configuration, on the insertion tube portion side, the screw hole is formed in a portion sealed with respect to the outside, so that the fluid does not leak to the outside even if the screw hole penetrates. For this reason, the insertion tube portion side actively forms a screw hole to ensure a sufficient screwing allowance of the screw member, but the receiving tube portion extends from the large diameter inner peripheral surface to the small diameter inner peripheral surface. By forming the screw hole in the non-through state in the thick-walled bent pipe portion, it is possible to sufficiently secure the screwing allowance of the screw member while avoiding fluid leakage.

According to a fifth characteristic configuration of the present invention, there is provided a pipe joint portion in which a space between the outer peripheral surface of the insertion tube portion and the large-diameter inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected is sealed by a sealing means. A method for enhancing prevention of separation, characterized in that it comprises the following steps 1) and 2).
1) A state in which the first lock member and the second lock member projecting inward in the radial direction are fixed to the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion, and then covered. Then, the portions extending between the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion are brought into contact with the first lock member from one side in the tube axis direction so that both tube portions are A first disengagement restricting portion for preventing disengagement, a second disengagement restricting portion for preventing disengagement of both pipe portions by contacting the second lock member from the other side in the tube axis direction, and both disengagement restriction An annular inner joint ring having a movable space that allows relative movement in the tube axis direction of both pipe portions within the connection maintaining range between the portions is mounted.
2) Between the opposite surface of the outer peripheral surface of the inner surface joint ring in the tube axis direction and the inner peripheral surface of the insertion tube portion, and the other end portion of the outer surface of the inner surface joint ring in the tube axis direction and the receiving tube. A sealing material is attached to each of the opposing surfaces of the portion facing the small-diameter inner peripheral surface, and the respective sealing materials are compressed from the tube axis direction into a sealed state by compression operation means provided at both ends of the inner surface joint ring. The inner joint ring is held at a predetermined position over the inner peripheral surfaces of both pipe portions.

According to the above-described characteristic configuration, the seal material mounted between the opposing surfaces of both the end portions in the tube axis direction of the inner surface joint ring and the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion is compressed. By compressing in the sealed state from the tube axis direction by the operating means, the annular gap between the fitting connection surfaces of both pipe portions can be sealed from the inside of the pipe, and the pressure contact force accompanying the compression of the both seal materials Thus, the inner joint ring can be held at a predetermined position over the inner peripheral surfaces of both pipe portions.
Moreover, both locking members formed on both sides of the outer peripheral surface of the inner surface joint ring in the tube axis direction, both locking members fixed to the inner peripheral surface of the insertion tube portion and the small diameter inner peripheral surface of the receiving tube portion; Since a movable space is provided between the pipes, when a tensile force is applied to the pipe joint due to an earthquake, non-uniform subsidence, etc., the tensile force is absorbed by the relative separation movement of both pipes in the movable space. If the relative separation movement cannot be absorbed, the first locking member fixed to the inner peripheral surface of the insertion tube portion and the first separation restricting portion of the inner joint ring from the tube axis direction can be applied. Or the contact between the second locking member fixed to the small-diameter inner peripheral surface of the receiving pipe part and the second separation regulating part of the inner surface joint ring from the tube axis direction, or the contact of both of them, It is possible to strongly prevent both pipe portions from moving apart beyond the connection maintaining range.

Accordingly, the sealing performance between the fitting connection surfaces of both pipe portions can be improved from the inside of the pipe, and a large external force such as a tensile force caused by an earthquake or non-uniform subsidence is absorbed as much as possible. If the external force cannot be absorbed by the relative separation of the two pipe parts, the first and second lock members on the two pipe parts side and the first on the inner joint ring side can be prevented. By the contact with the first and second detachment restricting portions, the detachment of both pipe portions can be strongly prevented.
Furthermore, since the first and second lock members are fixed to the inner peripheral surface side of both pipe portions by utilizing the space between the opposing surfaces of the inner peripheral surfaces of the pipe portions and the outer peripheral surface of the inner surface joint ring, The first and second lock members do not protrude to the flow path side, an increase in flow resistance can be suppressed, and the first and second lock members can be easily rust-proofed.

[First Embodiment]
1 to 4 show a structure for preventing separation of a pipe joint used in a piping system for fluid pipes such as water pipes and gas pipes and a method for strengthening prevention of separation, and is inserted into the receiving pipe part 1 of one fluid pipe P. 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.

  Fasteners 5 of the sealing means A are formed at bolt insertion holes 5a formed at a plurality of locations in the circumferential direction of the connection flange portion 1A of the receiving pipe portion 1 and at a plurality of locations in the circumferential direction of the connection flange portion 4A of the press ring 4. Of the bolt insertion holes 5b, a T-shaped bolt 5c inserted over the bolt insertion holes 5a and 5b facing each other in the tube axis X direction, and a nut 5d screwed into the protruding screw portion of the bolt 5c One end portion of the pusher wheel 4 in the tube axis X direction by the relative proximity movement of the pusher wheel 4 and the receiving pipe part 1 in the tube axis X direction accompanying the tightening operation of the bolt 5c and nut 5d. By simultaneously compressing and deforming the sealing material 3 with the seal pressing portion 4a formed on the inner surface, the space between 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 is sealed simultaneously. The pressure contact force accompanying the compression of the sealing material 3 Is constructed the pipe portion 1 and the two pipe sections 1 and 2 which is fitted and connected in a state that allows the bending of within a certain angular range of the inserted pipe section 2 so as to hold the retainer.

  A metal annular inner joint ring 10 is mounted 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, and the outer peripheral surface 10a of the inner joint ring 10 is mounted. Between the one end of the tube axis X direction and the inner peripheral surface 2 b of the insertion tube portion 2, and the other end portion of the outer peripheral surface 10 a of the inner joint ring 10 in the tube axis X direction and the receiving tube portion 2. Sealing materials 11 are mounted between the opposing surfaces of the small-diameter inner peripheral surface 2b, and the inner joint rings 10 are both compressed by compressing each sealing material 11 in a sealed state from the tube axis X direction. A compression operation means B is provided for holding the pipe portions 1 and 2 at predetermined positions over the inner peripheral surfaces 1b and 2b.

  Further, 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 located between the both seal members 11 are made of a metal first projecting radially inward. The lock member 12 and the second lock member 13 are fixed, and both pipes are brought into contact with the outer peripheral surface 10a of the inner surface joint ring 10 from one side of the tube axis X direction with respect to the first lock member 12. Both pipe parts by abutting from the other side in the tube axis X direction with respect to the second lock member 13 and the first detachment restricting surface 14 that is a first detachment restricting part that prevents the detachment of the parts 1 and 2. The second detachment restricting surface 15, which is a second detachment restricting portion that prevents detachment of 1, 2, keeps the relative movement in the tube axis X direction of both tube portions 1, 2 between the opposing surfaces within the connection maintaining range. It is formed in a state in which a movable space S allowed is provided.

  Further, the large-diameter inner peripheral surface 1a of the receiving tube portion 1 is formed in a tapered surface having a larger diameter toward the lower side of the insertion tube portion 2 in the insertion connection direction, in other words, the larger-diameter inner peripheral surface 1a side. The receiving tube portion 1 is fitted and connected between the tapered large-diameter inner peripheral surface 1a and the outer peripheral surface 2a of the insertion tube portion 2 within the gradient angle range of the tapered large-diameter inner peripheral surface 1a. A movable space S <b> 1 that allows bending of the insertion tube portion 2 is formed.

  Therefore, when a tensile force and a bending force are applied to the pipe joint portion due to an earthquake or uneven settlement, the tensile force and the bending force are moved relative to each other between the pipe portions 1 and 2 in the movable space S and the The first lock member fixed to the inner peripheral surface of the insertion tube portion can be absorbed by the bending of both the tube portions 1 and 2 in the movable space S1 and cannot be absorbed by the relative separation and bending. Abutment of the inner joint ring with the first separation restricting portion from the tube axis direction, or a second lock member fixed to the inner peripheral surface of the small diameter of the receiving pipe portion and a second separation restricting portion of the inner joint ring; By the abutment from the tube axis direction, or the abutment of both, it is possible to strongly prevent the both pipe portions from moving apart beyond the connection maintaining range.

  On both sides of the outer peripheral surface 10a of the inner surface joint ring 10 in the tube axis direction, a tapered surface 10c having a smaller diameter toward the outer side in contact with the O ring 11A and the rubber ring 11B which are constituent members of the seal material 11, and the O An annular restricting projection 10d that abuts the ring 11A from the axis X direction of the tube is formed, and the surface facing the tapered surface 10c and 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 An annular seal is mounted between the facing surfaces of the mortar lining layer 8 and the tapered surface 10c formed on 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. A space is formed, and annular connecting flange portions 10e protruding inward in the radial direction are integrally formed at both ends of the inner peripheral surface 10b of the inner surface joint ring 10 in the tube axis direction.

  The inner joint ring 10 is composed of semicircular arc-shaped split inner face joint bodies 10A and 10B that are divided into two in the circumferential direction, and the inner peripheral face 10b of both split inner face joint bodies 10A and 10B. A connecting piece 10f that protrudes radially inward is fixed to both ends in the circumferential direction and both sides in the tube axis X direction, and is connected through both connecting pieces 10f that face each other in the circumferential direction. The bolt 17 is pressed against the outer surface side of both the connecting pieces 10f to join and fix the adjacent end faces of the split inner face joints 10A and 10B in a sealed state with a sheet packing or the like, A lock nut 19 that presses the inner surface side of the piece 10f is screwed.

  The compression operating means B includes a cast iron push ring 21 that can compress the rubber ring 11B of the seal material 11 from the direction of the tube axis X to a sealed state (watertight state), and a connecting flange portion 21a of the push ring 21. And a connecting flange portion 10e of the inner face joint ring 10 is provided with a fastener 22 that fastens and fixes the push ring 21 and the inner face joint ring 10 while relatively pulling them from the tube axis X direction.

  The presser wheel 21 of the compression operation means B is composed of semicircular arc-shaped split pusher bodies 21A and 21B divided into two in the circumferential direction, and both end portions in the circumferential direction of the inner peripheral surfaces of both split pusher bodies 21A and 21B. The connecting pieces 21b projecting radially inward are fixed, and the connecting pieces 21b facing each other in the circumferential direction are fixedly connected by bolts 23 and nuts 24, respectively.

  The fasteners 22 of the compression operation means B are formed at bolt insertion holes 22a formed at a plurality of locations in the circumferential direction of the connection flange portion 10e of the inner surface joint ring 10 and at a plurality of locations in the circumferential direction of the connection flange portion 21a of the press ring 21. Among the bolt insertion holes 22b formed, a T-shaped bolt 22c inserted over the bolt insertion holes 22a and 22b facing each other in the tube axis X direction, and a nut 22d screwed into the protruding screw portion of the bolt 22c It is composed of

  The tube shaft core of the pusher wheel 21 is moved by the relative proximity movement in the tube axis X direction between the connecting flange portion 21a of the presser wheel 21 and the connecting flange portion 10e of the inner surface joint ring 10 in accordance with the tightening operation of the bolt 22c and nut 22d. The rubber ring 11B of the sealing material 11 is compressed and deformed by the seal pressing portion 21c formed at one end portion in the X direction, and formed on 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. If the mortar lining layer 8 and the outer peripheral surface 10a of the inner surface joint ring 10 are opposed to each other or the mounting region of the inner surface joint ring 10 and the press ring 21 in the mortar lining layer 8 is peeled off, the inner surface joint While sealing the space between the outer peripheral surface 10a of the ring 10 and 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 rubber ring 11B of the sealing material 11 is compressed. Accompanying pressure Therefore, the inner joint 10 is fixedly held at a predetermined position with respect to the inner peripheral surface 2b of the insertion tube portion 2 and the small-diameter inner peripheral surface 1b of the reception tube portion 1, and the reception tube portion 1 and the insertion tube portion 2 are fixed. Are held in a connected state.

  The first lock member 12 is composed of a pair of first divided lock bodies 12A and 12B formed in a semicircular arc shape with an outer diameter that is the same as the inner diameter of the inner peripheral surface 2b of the insertion tube portion 2. The first split lock bodies 12A and 12B are formed with first mounting holes 26 communicating in the radial direction with first screw holes 25 formed at a plurality of locations in the circumferential direction of the inner peripheral surface 2b of the insertion tube portion 2. And the first lock member 12 by a screw member 27 which is an example of a fixing member screwed and fixed to the first screw hole 25 on the inner peripheral surface 2b side of the insertion tube portion 2 through the first attachment holes 26. Is fixed to the inner peripheral surface 2 b of the intubation tube portion 2.

  The second lock member 13 is composed of a pair of second split lock bodies 13A and 13B formed in a semicircular arc shape with the same outer diameter as the inner diameter of the small-diameter inner peripheral surface 1b of the receiving pipe portion 1. Both the second divided lock bodies 13A and 13B are formed with second mounting holes 29 communicating in the radial direction with second screw holes 28 formed at a plurality of locations in the circumferential direction of the small-diameter inner peripheral surface 1b of the receiving pipe portion 1. And a screw member 30 which is an example of a fixing member screwed and fixed to the second screw hole 28 on the side of the small-diameter inner peripheral surface 1b of the receiving pipe portion 1 through the second mounting holes 29. A lock member 13 is fixed to the small-diameter inner peripheral surface 1 b of the receiving pipe portion 1.

  Rotation operation portions 27b and 30b such as hexagonal holes are formed in the head portions 27a and 30a of the screw members 27 and 30, and the first mounting hole 26 and the second lock member of the first lock member 12 are formed. The thirteen second mounting holes 29 are configured so that the heads 27a, 30a of the screw members 27, 30 can enter into a state where they are flush with the inner peripheral surfaces of the lock members 12, 13.

  In addition, the first screw hole 25 on the insertion tube portion 2 side is formed in a penetrating state from the radially inner side, and the second screw hole 28 on the receiving tube portion 1 side has a large diameter inside. A thick bent tube portion extending from the circumferential surface 1a to the small-diameter inner circumferential surface 1b is formed in a non-penetrating state from the radially inner side.

  An annular groove 10g into which both lock members 12, 13 can enter is formed on the outer peripheral surface 10a of the inner joint ring 10, and both screw members in which the outer peripheral surface portion located in the annular groove 10g is screwed and fixed. The annular wall surfaces that are formed on the loosening prevention regulating surface 16 located close to the heads 27 and 30 and that face each other in the tube axis X direction of the annular groove 10g are the first separation regulating surface 14 and The second separation regulating surface 15 is configured.

  The movable space S includes an interval between the first separation restriction surface 14 and the first lock member 12 in the tube axis X direction, and a tube axis between the second separation restriction surface 15 and the second lock member 13. The opposing intervals in the X direction are configured to be smaller than the length from the distal end of the insertion tube portion 2 to the distal end of the sealing material 3.

Next, a method for enhancing the prevention of detachment of the pipe joint portion configured as described above will be 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, the first and second lock members 12 and 13 made of metal projecting radially inward. The predetermined area including the mounting location is peeled over the entire circumference.
(2) Of the lining layer peeling region of the inner peripheral surface 2b of the insertion tube portion 2 and the lining layer peeling region of the small-diameter inner peripheral surface 1b of the receiving tube portion 1, the first lock member 12 and the second lock member 13 A first screw hole 25 extending in the radial direction from the inside of the tube by a punching device and a screw forming device carried into the tube at portions corresponding to the first mounting hole 26 and the second mounting hole 29 formed at a plurality of locations in the circumferential direction. And the 2nd screw hole 28 is formed.
The first lock member 12 is screwed and fixed to the first screw hole 25 on the inner peripheral surface 2b side of the insertion tube portion 2 through the first attachment holes 26, and the first lock member 12 is connected to the inner periphery of the insertion tube portion 2. The second lock member 13 is fixed by the screw member 30 fixed to the surface 2b and screwed and fixed to the second screw hole 28 on the small-diameter inner peripheral surface 1b side of the receiving pipe portion 1 through the second mounting holes 29. It fixes to the small diameter inner peripheral surface 1b of the receiving pipe part 1. FIG.

  (3) The mortar lining layer 8 covering the inner peripheral surface 2b of the insertion tube portion 2 and the mortar lining layer 8 covering the small-diameter inner peripheral surface of the receiving tube portion 1 were divided into two in the circumferential direction. A metal inner surface joint ring 10 composed of semicircular arc-shaped divided inner surface joint bodies 10A and 10B is housed, and tapered surfaces 10c formed on both sides of the outer peripheral surface 10a of the inner surface joint ring 10 in the tube axis direction are inserted. An O-ring 11A and a rubber ring which are constituent members of the sealing material 11 are formed in an annular seal mounting space formed between the facing surfaces of the mouth tube portion 2 side and the receiving tube portion 1 side facing the mortar lining layer 8. Wear 11B.

  (4) Next, the mortar lining layer 8 on the inlet tube portion 2 side and the mortar lining layer 8 on the inlet tube portion 1 side were divided into two parts in the circumferential direction facing the both ends of the inner joint ring 10. A push ring 21 made up of semicircular arc shaped push ring bodies 21A, 21B is housed, and bolt insertion holes 22b formed at a plurality of locations in the circumferential direction of the coupling flange portion 21a of the push ring 21 and the coupling flange portion 10e of the inner joint ring 10 are provided. Among the bolt insertion holes 22a formed at a plurality of locations in the circumferential direction, the T-shaped bolts 22c of the fasteners 22 are inserted through the bolt insertion holes 22a and 22b facing each other in the tube axis X direction, and the protruding screws of the bolts 22c The nut 22d of the fastener 22 screwed to the portion is tightened.

  As the bolt 22c and nut 22d are tightened, the connecting flange portion 21a of the press ring 21 and the connecting flange portion 10e of the inner face joint ring 10 move relatively close to each other in the tube axis X direction. The rubber ring 11B of the sealing material 21 is compressed and deformed by the seal pressing part 21c formed at one end of the mortar lining layer 8 on the insertion tube part 2 side and the receiving pipe part 1 side and the outer peripheral surface of the inner joint ring 10 10a is sealed against 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 by the pressure contact force associated with the compression of the rubber ring 11B of the sealing material 11. The inner joint ring 10 is fixed and held at a predetermined position, and the receiving pipe portion 1 and the insertion pipe portion 2 are held out in a connected state.

  (5) An annular groove 10g into which both lock members 12 and 13 can enter is formed on the outer peripheral surface 10a of the inner face joint ring 10, and the annular grooves 10g are opposed to each other in the tube axis X direction. A first detachment restricting surface 14 that prevents the detachment of both pipe portions 1 and 2 by the wall surface coming into contact with the first lock member 12 from one side in the tube axis X direction, and the second lock member 13. The second detachment restricting surface 15 is configured to prevent the detachment of both the pipe portions 1 and 2 by abutting from the other side of the tube axis X with respect to the first detachment restricting surface 14 and the first detachment restricting surface 14. Between the opposing surfaces of the lock member 12 and between the opposing surfaces of the second detachment restricting surface 15 and the second lock member 13, the relative movement in the tube axis X direction of both pipe portions 1 and 2 is within the connection maintaining range. A movable space S that is allowed by the above is formed.

  Therefore, when a tensile force acts on the pipe joint portion due to an earthquake, uneven settlement, etc., this tensile force can be absorbed by the relative separation movement of both pipe portions 1 and 2 in the movable space S, and If absorption is not possible due to this relative separation movement, the first lock member 12 fixed to the inner peripheral surface 2b of the insertion tube portion 2 and the first separation regulating surface 14 of the inner surface joint ring 10 from the tube axis X direction. Contact, contact between the second lock member 13 fixed to the small-diameter inner peripheral surface 1b of the receiving pipe portion 1 and the second separation regulating surface 15 of the inner surface joint ring 10 from the tube axis X direction, or Due to the abutment of both, it is possible to strongly prevent the pipe portions 1 and 2 from detaching beyond the connection maintaining range.

  Furthermore, the inner peripheral surface of both the pipe parts 1 and 2 is utilized using the sealed space between the opposing surfaces of the inner peripheral surfaces 1b and 2b of the both pipe parts 1 and 2 and the outer peripheral surface 10a of the inner joint ring 10. Since the first and second lock members 12 and 13 are fixed to the 1b and 2b sides, the first and second lock members 12 and 13 do not protrude to the flow path side, and an increase in flow resistance can be suppressed. In addition, the first and second lock members 12 and 13 can be easily rust-proofed.

[Second Embodiment]
In the first embodiment described above, the first lock member 12 and the second lock member 13 are connected to 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 by screw members 27 and 30. As shown in FIG. 5, the first lock member 12 and the second lock member 13 are welded to the inner peripheral surface 2 b of the insertion tube portion 2 and the small-diameter inner peripheral surface 1 b of the receiving tube portion 1. It may be fixed to.
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) 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.

  (2) As the compression operation means B, by compressing each sealing material 11 in a sealed state from the direction of the tube axis X, the inner surface joint ring 10 is brought into a predetermined position over the inner peripheral surfaces of both pipe portions 1 and 2. Any compression operation structure may be adopted as long as it can be held.

  (3) The first detachment restricting portion 14 can prevent the detachment of both the tube portions 1 and 2 by contacting the first lock member 12 from one side in the tube axis direction. The second detachment restricting portion 15 may also prevent the detachment of both the tube portions 1 and 2 by contacting the second lock member 13 from the other side in the tube axis direction. If it is.

(4) In each of the above-described embodiments, radially inward of the mortar lining layer 8 formed on 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 predetermined region including the mounting portions of the first lock member 12 and the second lock member 13 made of metal protruding toward the outer periphery is peeled over the entire circumference, but the mounting region of the inner surface joint ring 10 and the press ring 21 in the mortar lining layer 8 or Even if the above region is peeled off, the gap between the outer peripheral surface 10a of the inner joint ring 10, 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 directly sealed. Good.

(5) In each of the above-described embodiments, the inner surface joint ring 20 is divided into two parts in the circumferential direction.

The disassembled perspective view of the principal part which shows 1st Embodiment of the detachment prevention structure of a pipe joint part by this invention, and the detachment prevention reinforcement | strengthening method Cross-sectional side view with the cross-sectional position changed between the upper half and lower half when construction is completed III-III sectional view of FIG. Enlarged cross-sectional side view of the main part The expanded sectional side view of the principal part which shows 2nd Embodiment of the detachment prevention structure of the pipe joint part by this invention, and the detachment prevention reinforcement | strengthening method

Explanation of symbols

A Sealing means B Compression operating means 1 Receiving tube portion 1a Large diameter inner peripheral surface 1b Small diameter inner peripheral surface 2 Insertion tube portion 2a Outer peripheral surface 2b Inner peripheral surface 8 Lining layer (mortar lining layer)
DESCRIPTION OF SYMBOLS 10 Inner surface joint ring 11 Sealing material 12 1st lock member 13 2nd lock member 14 1st removal control part (1st removal control surface)
15 Second withdrawal regulating section (second withdrawal regulating surface)
16 Locking restricting surface 25 Screw hole (first screw hole)
27 Screw member 27a Head 28 Screw hole (second screw hole)
30 Screw member 30a Head

Claims (5)

A sealing means for sealing a space between the outer peripheral surface of the insertion tube portion and a large-diameter inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and connected is provided, and the inner peripheral surface of the insertion tube portion and the receiving tube An annular inner ring is attached to the inner peripheral surface of the small-diameter portion, and the inner surface joint is formed between the opposing surface of the outer peripheral surface of the inner surface ring in the axial direction of the tube axis and the inner peripheral surface of the insertion tube portion. A pipe joint portion detachment prevention structure in which a seal material is mounted between each of the opposing surfaces of the other end portion in the tube axis direction of the outer peripheral surface of the ring and the small-diameter inner peripheral surface of the receiving pipe portion,
Compression operation means is provided to hold the inner joint ring in a predetermined position across the inner peripheral surfaces of both pipe portions by compressing each of the sealing materials in a sealed state from the tube axis direction, and located between the two sealing materials. A first lock member and a second lock member projecting radially inward are fixed to the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion, and the outer peripheral surface of the inner joint ring A first detachment restricting portion that prevents the detachment of both tube portions by contacting the first lock member from one side in the tube axis direction, and a tube axis with respect to the second lock member. A movable space that allows relative movement in the tube axis direction of both pipe portions within the connection maintaining range is provided with a second detachment restricting portion that prevents the detachment of both pipe portions by contacting from the other side of the direction. Detachment prevention structure for pipe joints formed in a bent state.   The said 1st lock member and the 2nd lock member are being fixed to the site | part which peeled the lining layer formed in the internal peripheral surface of an insertion tube part, and the small diameter internal peripheral surface of a receiving pipe part. Structure to prevent detachment of pipe joints.   The first lock member and the second lock member are fixed by screw members that are screwed into screw holes formed in the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion, The pipe joint portion separation preventing structure according to claim 1 or 2, wherein an outer peripheral surface of the inner surface joint ring is configured as a loosening prevention regulating surface positioned in the vicinity of a head of a screw member fixed by screwing.   The screw hole on the insertion tube portion side is formed in a penetrating state from the radially inner side, and the screw hole on the receiving tube portion side has a thickness from the large diameter inner peripheral surface to the small diameter inner peripheral surface. 4. The structure for preventing the separation of a pipe joint part according to claim 3, wherein the structure is formed in the meat bending pipe part in a non-penetrating state from the inside in the radial direction. A method for strengthening the prevention of detachment of a pipe joint portion in which a space between the outer peripheral surface of the insertion tube portion and a large-diameter inner peripheral surface of the receiving tube portion to which the insertion tube portion is inserted and sealed is sealed with a sealing means. It is characterized by comprising the steps 1) and 2).
1) A state in which the first lock member and the second lock member projecting inward in the radial direction are fixed to the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion, and then covered. Then, the portions extending between the inner peripheral surface of the insertion tube portion and the small-diameter inner peripheral surface of the receiving tube portion are brought into contact with the first lock member from one side in the tube axis direction so that both tube portions are A first disengagement restricting portion for preventing disengagement, a second disengagement restricting portion for preventing disengagement of both pipe portions by contacting the second lock member from the other side in the tube axis direction, and both disengagement restriction An annular inner joint ring having a movable space that allows relative movement in the tube axis direction of both pipe portions within the connection maintaining range between the portions is mounted.
2) Between the opposite surface of the outer peripheral surface of the inner surface joint ring in the tube axis direction and the inner peripheral surface of the insertion tube portion, and the other end portion of the outer surface of the inner surface joint ring in the tube axis direction and the receiving tube. A sealing material is attached to each of the opposing surfaces of the portion facing the small-diameter inner peripheral surface, and the respective sealing materials are compressed from the tube axis direction into a sealed state by compression operation means provided at both ends of the inner surface joint ring. The inner joint ring is held at a predetermined position over the inner peripheral surfaces of both pipe portions.

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