JP2010096305A - Pipe coupling structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable working to verify the connection of an insertion pipe with a receptacle pipe and to enable inspection to facilitate the connection and furthermore to enable a pipe coupling to perform disassembly work efficiently easily while enhancing the vibrational proof for the external force of tension and compression directions. <P>SOLUTION: A pressing ring 5 which is provided with a press part 9 capable of compressing a sealing material 3 interposed between the tapered inner peripheral surface 1d of the receptacle pipe 1 and outer peripheral surface 2b of the insertion pipe 2 is attached over the insertion pipe 2 capable of being inserted into and connected to the receptacle pipe 1. A tighten means 4 which tighten and fixes the pressing ring 5 and the receptacle pipe 1 is provided and at the same time abutment part 10 which regulates the maximum compression position of the sealing material 3 due to the press part 9 of the pressing ring 5, following the tightening stationary operation of the tighten means 4 and abutting with each other, is formed in the part mutually opposing to the receptacle pipe 1 and the pressing ring 5. In addition, a recessed portion 7 which fits from diametrically outward of the pipe with respect to a projection 6 provided on the outer peripheral surface 2b of the insertion pipe 2 is formed on the interior surface of the pressing ring 5. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a joint structure for connecting fluid pipes such as water pipes and gas pipes or connecting a fluid pipe and a connecting pipe part of a fluid device, and more specifically, an insertion pipe with respect to a receiving pipe part. The present invention relates to a pipe joint structure in which a portion is inserted and connected from the pipe axis direction.

Examples of the pipe joint structure with improved earthquake resistance include the pipe joint structures shown in Patent Documents 1 and 2 below and the pipe joint structure shown in Patent Document 3.
In the former pipe joint structure, the insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction is provided between the tapered inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. An annular push ring provided with a pressing portion capable of compressing the interposed sealing material from the tube axis direction is externally provided, and a fastening means is provided for tightening and fixing the push ring and the receiving pipe portion while relatively pulling them from the tube axis direction. In addition, the push wheel includes an annular ring located on the opposite side of the distal end side of the insertion tube portion, of the annular side surfaces on both sides in the tube axis direction of the annular protrusion integrally formed on the outer peripheral surface of the insertion tube portion. An annular engagement surface that prevents the insertion tube portion from moving away from the receiving tube portion by engaging the side surface from the tube axis direction is formed.

  In the latter pipe joint structure, the insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction is provided between the tapered inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion. An annular push ring capable of compressing the interposed sealing material from the tube axis direction is externally provided, and fastening means for fastening and fixing the push ring and the receiving pipe portion while relatively pulling from the tube axis direction is provided, An annular groove formed on the outer peripheral surface of the insertion tube portion is provided with a substantially C-shaped lock ring that can be elastically deformed on the enlarged diameter side interposed between the push ring and the sealing material. The outer peripheral surface of the lock ring is formed with a tapered surface that can be fitted into the tapered inner peripheral surface of the receiving tube portion from the tube axis direction and has a larger gradient than the tapered inner peripheral surface of the receiving tube portion. .

Japanese Patent Laid-Open No. 54-16718 Japanese Patent Laid-Open No. 2003-14174 Japanese Utility Model Publication No. 58-138887

  In the case of the former pipe joint structure, even if a tensile force due to an earthquake or unequal subsidence acts on the connected receiving pipe section and the insertion pipe section, the receiving pipe section is connected with a fastening means. With the engagement of the annular engagement surface of the press ring fixedly connected to the annular projection of the insertion tube portion, the separation movement of the insertion tube portion with respect to the reception tube portion can be strongly prevented, for example, By engaging the annular projection formed on the outer peripheral surface of the insertion tube portion from the tube axis direction in the annular groove formed on the inner peripheral surface of the reception tube portion, the insertion tube portion of the insertion tube portion is Compared to a pipe joint structure equipped with a lock ring that prevents disengagement movement, after releasing the tightening and fixing by the fastening means, it is only necessary to pull out the insertion tube portion from the receiving tube portion. Therefore, the work of disassembling the pipe joint structure can be performed efficiently and easily.

  However, since the pushing movement of the insertion tube portion with respect to the receiving tube portion is not restricted, when a compressive force due to an earthquake or unequal subsidence acts, the distal end of the insertion tube portion becomes the receiving tube. Colliding with the inner wall of the part, the lining layer coated on the inner peripheral surface of the receiving pipe part may peel off.

  Moreover, when connecting the receiving tube portion and the insertion tube portion, generally, a method of managing with the tightening torque of the bolt constituting the fastening means is adopted, but not managing with the tightening torque The tightening force of bolts depends on the skill level of the operator, leading to a decrease in sealing performance (watertightness performance) due to variations in the surface pressure of the sealing material due to one-side tightening (extremely tightening one) or insufficient tightening. Further, it is extremely difficult for a third party to confirm the insertion connection length, sealing state, and tightening / fixing state of the insertion tube portion with respect to the reception tube portion.

  In the case of the latter pipe joint structure, the taper inner peripheral surface and the outer end surface of the receiving pipe part intersect with the relative proximity movement of the receiving pipe part and the insertion pipe part due to the fastening and fixing operation of the fastening means. The opening edge, which is the location, bites into the taper outer peripheral surface of the lock ring, and the relative movement in the tube axis direction between the receiving tube and the insertion tube is prevented, so that tension caused by earthquakes, uneven settlement, etc. When a force is applied, the detachment movement of the insertion tube portion with respect to the receiving tube portion can be strongly prevented, and when a compressive force is applied, the distal end of the insertion tube portion is connected to the receiving tube. Colliding with the inner wall of the part can be prevented.

  However, with the tightening and fixing operation of the fastening means, the tapered outer peripheral surface of the lock ring having a larger gradient with respect to the opening end edge of the tapered inner peripheral surface of the receiving tube portion bites into a wedge shape, and the insertion tube Because the bending force on the radially inner side acts on the part and the bending force on the radially outer side acts on the receiving pipe part, especially when excessive tightening of the bolt occurs, While stress concentrates in the ring mounting groove, the surface pressure of the sealing material decreases, and there is a problem in that it takes time to remove the lock ring that has been bitten during disassembly.

  The present invention has been made in view of the above-described situation, and its main problem is to ensure and facilitate the connection work between the receiving tube portion and the insertion tube portion, and to facilitate the connection inspection. In addition, the present invention is to provide a pipe joint structure capable of efficiently and easily performing a dismantling operation while enhancing the earthquake resistance performance against external forces in the tension direction and the compression direction.

  According to a first characteristic configuration of the present invention, an insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction includes a tapered inner peripheral surface of the receiving tube portion and an outer peripheral surface of the insertion tube portion. A press ring provided with a pressing portion capable of compressing the sealing material interposed between them from the tube axis direction is externally provided, and fastening means for fastening and fixing the press ring and the receiving pipe portion is provided, and the receiving port A contact portion that restricts the maximum compression position of the sealing material by the pressing portion of the push ring by abutting with each other in accordance with the tightening and fixing operation of the fastening means at a portion where the tube portion and the push wheel face each other in the tube axis direction. In addition, a recess is formed on the inner peripheral surface of the push ring so as to be fitted to the protrusion provided on the outer peripheral surface of the insertion tube portion from the outside in the tube radial direction.

  According to the above characteristic configuration, when connecting the receiving tube portion and the insertion tube portion, the insertion tube portion in which the sealing material is sheathed with respect to the reception tube portion is inserted from the tube axis direction, and the insertion tube When the concave portion formed on the inner peripheral surface of the press ring is fitted from the outer side in the tube radial direction to the protrusion provided on the outer peripheral surface of the portion, and the fastening means is tightened and fixed in this state, the receiving tube portion and The inlet tube part is relatively pulled and moved from the tube axis direction, and the seal material located between the tapered inner peripheral surface of the inlet tube part and the outer peripheral surface of the inlet tube part is compressed from the tube axis direction. Is done.

  Then, the fastening and fixing operation of the fastening means is finished when the contact portion of the push ring and the contact portion of the receiving tube portion come into contact, and in this state, the connection length between the receiving tube portion and the insertion tube portion When the set connection length is reached, the sealing material is compressed into a predetermined sealed state.

  Therefore, it is possible to always compress the sealing material into a predetermined sealed state by the pressing portion of the push ring without adopting the conventional method of managing with the tightening torque of the bolt constituting the fastening means. In addition, even when a third party inspects the connection after the tightening and fixing operation, it is only necessary to confirm the contact state between the contact portion of the press ring and the contact portion of the receiving pipe portion.

  Moreover, in the state where the tightening and fixing operation of the fastening means is completed, the relative movement in the tube axis direction between the receiving tube portion and the insertion tube portion is prevented from being engaged, resulting in an earthquake, uneven settlement, etc. When an external force in the pulling direction is applied, it is possible to strongly prevent the insertion tube portion from moving away from the receiving tube portion, and when an external force in the compression direction is applied, the insertion tube portion Can be strongly prevented from colliding with the inner wall of the receiving tube.

  Therefore, it is possible to ensure and facilitate the connection work between the receiving tube portion and the insertion tube portion and facilitate the connection inspection, and while improving the seismic performance against the external force in the tension direction and the compression direction, Since there is no wedged portion as in the prior art, it is only necessary to release the tightening and fixing by the fastening means and to disengage both pipe portions, and the disassembly work of the pipe joint structure can be performed efficiently and easily.

  According to a second characteristic configuration of the present invention, an insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction includes a tapered inner peripheral surface of the receiving tube portion and an outer peripheral surface of the insertion tube portion. A press ring having a split structure including a pressing portion capable of compressing a sealing material interposed between the press axis direction from the tube axis direction is externally provided, and fastening means for fastening and fixing the press ring and the receiving pipe portion are provided, The maximum compression position of the sealing material by the pressing portion of the press ring is regulated by abutting each other in the tube axial direction of the receiving pipe portion and the press ring in contact with each other as the fastening means is tightened and fixed. A contact portion is formed, and the inner peripheral surface of the plurality of divided pusher wheels constituting the pusher wheel is fitted from the outside in the radial direction to the protrusion formed integrally with the outer peripheral surface of the insertion tube portion. This is in that a concave portion is formed.

  According to the above characteristic configuration, in addition to the operations and effects described in the first characteristic configuration described above, when connecting the receiving tube portion and the insertion tube portion, the push ring is divided from a plurality of divided push ring bodies. In addition, since the protrusion is integrally formed on the outer peripheral surface of the insertion tube portion, it is only necessary to pre-assemble the sealing material with respect to the insertion tube portion, and the number of work steps at the construction site is reduced. Reduction and easy connection work can be achieved.

  According to a third characteristic configuration of the present invention, an insertion tube portion that can be inserted and connected to the receiving tube portion of another fluid tube from the tube axis direction is formed at least at one end portion of the bending fluid tube. A split ring having a pressing structure capable of compressing an annular sealing material interposed between a tapered inner peripheral surface of the receiving tube portion and an outer peripheral surface of the insertion tube portion from the tube axis direction. And a fastening means for fastening and fixing the press ring and the receiving pipe portion are provided, and the fastening means is fastened to a portion of the receiving pipe portion and the press ring facing each other in the tube axis direction. A contact portion that regulates the maximum compression position of the sealing material by the pressing portion of the push ring by abutting with each other with the fixing operation is formed, and further, on the inner peripheral surface of the plurality of divided push ring bodies constituting the push ring, From the outside in the tube radial direction with respect to the protrusion provided on the outer peripheral surface of the insertion tube portion Lies in recess engagement is formed.

  According to the above characteristic configuration, in the pipe joint structure on at least one end side of the bending fluid pipe, the same function / effect as described in the above first characteristic configuration is exhibited. A plurality of divided pushers constituting the pusher wheel at the time of disassembly as long as a space can be secured between the receiving end surface of the pipe receiving pipe part and the bent portion of the bending fluid pipe inserted and connected thereto. Since the body can be taken out radially outward, the bent part of the bending fluid pipe does not become an obstruction to dismantling, and even if it is a bent fluid pipe such as an elbow, the dismantling work is made more efficient and easier. Can be achieved.

  According to a fourth characteristic configuration of the present invention, the pusher wheel is in contact with the tapered inner peripheral surface of the receiving tube part in a state where the contacting part of the receiving tube part and the contacting part of the push wheel are in contact with each other. Or it is in the point which the adjacent taper surface is formed.

  According to the above characteristic configuration, in a state where the contact portion of the press wheel and the contact portion of the receiving tube portion come into contact with the fastening fixing operation of the fastening means, the tapered surface formed on the press wheel has the receiving tube portion. It is possible to correct the connection posture between the receiving tube portion and the insertion tube portion in an in-fitted state with an inner fitting state of the taper inner peripheral surface of the taper, and the external force in the bending direction due to an earthquake, unequal subsidence, etc. When acting, this bending external force can be received even at the contact point between the tapered surface of the push wheel and the tapered inner peripheral surface of the receiving tube portion, so that the earthquake resistance against the bending external force can be improved.

  According to a fifth characteristic configuration of the present invention, when a plurality of divided pusher bodies constituting the pusher ring are mounted on an insertion tube, the recessed part of the divided pusher body communicates with the concave part of another divided pusher wheel in the circumferential direction. It is in a formed point.

  According to the above characteristic configuration, a plurality of divided push wheels may be used in any form in which the protrusion on the outer peripheral surface of the insertion tube portion is annular or substantially annular in the tube circumferential direction or is intermittent in the tube circumferential direction. The body can be easily fitted and mounted.

[First Embodiment]
1 to 6 are arranged on both sides of an orthogonal path location in a fluid piping system constituted by an appropriate combination of fluid pipes P1 and P2 such as water pipes and gas pipes and fluid equipment such as gate valves and air valves. Insertions formed at both ends of a bent fluid pipe (elbow) P2 made of cast iron bent at 90 degrees with respect to the receiving pipe portion 1 formed with an enlarged diameter at one end of the fluid pipe P1 made of cast iron A pipe joint structure in which the pipe part 2 is inserted and connected in a sealed (watertight) state is shown.

The distal end surface 2a of the inlet tube portion 2 is located at a position corresponding to the boundary between the large-diameter inner peripheral surface 1a of the receiving pipe portion 1 of the fluid pipe P1 and the small-diameter inner peripheral surface 1b on the intermediate tube portion side continuous therewith. An annular stepped wall surface 1c that can abut from the tube axis X direction is formed, and a synthetic rubber circle is formed between the large-diameter inner peripheral surface 1a and the outer peripheral surface 2b of the insertion tube portion 2 on the opening side. A tapered inner peripheral surface 1d having a larger diameter toward the opening edge side that exposes the mounting space for mounting the annular seal member (rubber ring) 3 is formed, and the outer diameter of the receiving pipe portion 1 is large. An annular connecting flange portion 1A that protrudes radially outward is integrally formed on the receiving end face side of the surface 1e.

  Fastening means 4 is connected to the connecting flange portion 1A of the receiving tube portion 1 in a state where the outer peripheral surface 2b of the inserting tube portion 2 is inserted and connected to the receiving tube portion 1 with a set connection length. An annular projection 6 projecting radially outward is integrally formed at a portion corresponding to a mounting region of a cast iron push ring 5 that is fastened and fixed via bolts 4A and nuts 4B, which are an example of the above.

  As shown in FIGS. 3 to 6, the pusher wheel 5 is divided into two in a form that can be assembled into a substantially square outline shape when viewed in the tube axis X direction provided with bolt insertion holes 8 at four locations intersecting two diagonal lines. The split pusher body 5A having the same shape is formed on the inner peripheral surface of both split pusher bodies 5A with respect to the annular protrusion 6 formed to protrude from the outer peripheral surface 2b of the insertion tube portion 2. An arcuate recess 7 that can be fitted from the outside in the radial direction of the pipe is formed in a state of communicating with the recess 7 of the adjacent divided pusher body 5A in the circumferential direction.

  The inner peripheral surface of each of the divided pusher bodies 5A includes an arc-shaped inner peripheral surface 5a extending over a range of 180 degrees with the tube axis X as the center of the arc, and an extended inner surface 5b extending linearly along the tangential direction from both ends thereof. The extended inner surface 5b is a load receiving surface for temporarily holding the divided pusher body 5A on the insertion tube part 2 when the divided pusher body 5A is attached to the insertion tube part 2 from the lateral direction. It is configured.

  The connecting portions 5c at both ends in the circumferential direction of each divided pusher body 5A are formed with connecting recesses 5d that are recessed in opposite directions in the tube axis X direction with the groove width center position of the recess 7 as a bottom surface. When the two divided pusher bodies 5A arranged opposite to each other in the posture are joined in a state in which the connecting portions 5c facing each other are overlapped, the front end surface 5e of each connecting portion 5c comes into contact with the step surface 5f of the connecting recess 5d. It is configured.

  Of the portions 5g and 5h located on both sides in the tube axis X direction of the concave portion 7 in each divided pusher body 5A, the outer tube portion 5g on the outer tube portion 1 side having a large thickness is provided on the outer surface of the receiving tube portion. 1 is capable of entering and moving from the opening side of the mounting space S formed between the tapered inner peripheral surface 1d and the outer peripheral surface 2b of the insertion tube portion 2, and is tightened by the bolt 4A and nut 4B of the fastening means 4 A semicircular pressing portion 9 that can compress the sealing material 3 mounted in the mounting space S in a sealed (watertight) state from the direction of the tube axis X in accordance with the fixing operation is integrally formed.

  As shown in FIGS. 1 to 3, the fastening means 4 is tightened with bolts 4 </ b> A and nuts 4 </ b> B at the portions of the receiving pipe portion 1 that are opposite to each other in the tube axis X direction between the connecting flange portion 1 </ b> A and the presser wheel 5. Abutting portions 10 and 11 for restricting the maximum compression position of the sealing material 3 by the pressing portion 9 of the push wheel 5 by being brought into contact with each other in accordance with the fixing operation are formed, and on the outer peripheral surface of the pressing portion 9, A tapered surface 12 that is in contact with or close to the tapered inner peripheral surface 1d of the receiving tube portion 1 in a state where the contacting portion 10 of the receiving tube portion 1 and the contacting portion 11 of the push ring 5 are in contact with each other. It is formed with the same gradient as that of the taper inner peripheral surface 1 d of the receiving tube portion 1.

  In a state in which the contact portion 11 of the pusher wheel 5 and the contact portion 10 of the connecting flange portion 1A of the receiving pipe portion 1 are in contact with the fastening operation by the bolt 4A and the nut 4B of the fastening means 4, the pusher wheel 5 The formed tapered surface 12 is in contact with or close to the tapered inner peripheral surface 1d of the receiving tube portion 1 in an internally fitted state, and the connection posture between the receiving tube portion 1 and the insertion tube portion 2 can be corrected. When an external force in the bending direction due to an earthquake, uneven settlement or the like is applied, the bending external force can be received even at a contact point between the tapered surface 12 of the pusher wheel 5 and the tapered inner peripheral surface 1d of the receiving pipe portion 1. Therefore, the joint portion of the press wheel 5 does not spread due to the bending external force, and the earthquake resistance can be improved.

Next, the connection method in the case of connecting the receiving pipe part 1 of the fluid pipe P1 and the insertion pipe part 2 of the bending fluid pipe P2 will be briefly described.
(1) First, the annular sealing material 3 is externally mounted on the outer peripheral surface 2b of the insertion tube portion 2 in a state in which a mounting region for the presser wheel 5 is secured between the outer circumferential surface 2b and the annular projection 6 formed on the outer circumferential surface 2b. After that, the insertion tube portion 2 is inserted into the receiving tube portion 1 from the tube axis X direction.
In this state, a part of the sealing material 3 enters the mounting space S formed between the tapered inner peripheral surface 1 d of the receiving tube portion 1 and the outer peripheral surface 2 b of the insertion tube portion 2.

(2) At the same time as fitting and mounting the concave portion 7 formed on both split pusher bodies 5A of the press ring 5 to the annular projection 6 of the insertion tube portion 2 from the outside in the pipe radial direction, both split press ring bodies After combining 5A into a substantially square shape, the bolt 4A of the fastening means 4 extends over the bolt insertion hole 8 of the press ring 5 and the bolt insertion hole 13 formed in the connecting flange portion 1A of the receiving pipe portion 1. The nut 4B that is inserted through and screwed to the tip side of the bolt 4A is tightened and fixed.

  Due to the relative proximity movement in the tube axis X direction between the connection flange portion 1A of the receiving tube portion 1 and the presser wheel 5 in accordance with the tightening and fixing operation of the nut 4B, the insertion tube portion 2 with respect to the receiving tube portion 1 is provided. Is inserted and connected, and the sealing member 3 is pushed into the mounting space S between the tapered inner peripheral surface 1d of the receiving tube portion 1 and the outer peripheral surface 2b of the insertion tube portion 2 by the pressing portion 9 of the push ring 5. And compressed.

(3) When the contact portion 10 of the receiving tube portion 1 and the contact portion 11 of the push ring 5 come into contact with the tightening and fixing operation of the nut 4B, in this state, the receiving tube portion 1 and the insertion tube portion 2 And the press member 9 of the pusher wheel 5 are stopped at the maximum compression position of the seal material 3, and the seal material 3 mounted in the mounting space S is set and sealed ( Compressed to a watertight state.

  Further, in a state where the contact portion 10 of the receiving tube portion 1 and the contact portion 11 of the push ring 5 are in contact with each other, the tapered surface 12 formed on the push wheel 5 is formed on the tapered inner peripheral surface 1d of the receiving tube portion 1. Contact or approach in an internally fitted state.

  Therefore, the sealing material 3 is always compressed into a predetermined sealed state by the pressing portion 9 of the pusher wheel 5 without adopting a method of managing the bolts 4A and nuts 4B constituting the fastening means 4 with the tightening torque. The fitting connection length between the receiving tube portion 1 and the insertion tube portion 2 becomes the set fitting connection length, and a third party connects after the fastening and fixing operation of the fastening means 4 Even when the state is inspected, it is only necessary to visually check the contact state between the contact portion 11 of the pusher wheel 5 and the contact portion 10 of the receiving pipe portion 1.

  In addition, when the abutting portion 11 of the press ring 5 and the abutting portion 10 of the receiving tube portion 1 are in contact with each other by the tightening and fixing operation of the fastening means 4 with the bolts 4A and nuts 4B, the receiving tube portion 1 and the receiving tube portion 1 are inserted. Since the relative movement in the tube axis X direction with the mouth tube portion 2 is prevented from being engaged, when an external force in the pulling direction due to an earthquake or unequal subsidence is applied, the tube tube portion 2 is inserted into the mouth tube portion 1. When the external force in the compression direction acts, the distal end surface 2a of the insertion tube portion 2 collides with the stepped wall surface 1c of the reception tube portion 1 when the separation movement of the mouth tube portion 2 can be strongly prevented. It is possible to prevent the lining layer (painting or the like) from peeling off at the water contact portion.

[Second Embodiment]
In the above-described first embodiment, the protrusion 6 into which the concave portion 7 of the pusher wheel 5 can be fitted from the outside in the radial direction of the tube is integrally formed on the outer peripheral surface 2b of the insertion tube portion 2, but as shown in FIG. In addition, a substantially C-shaped lock ring 16 that is elastically deformable on the diameter-enlarged side cut at one circumferential direction is attached to the circumferential groove 15 formed on the outer peripheral surface 2b of the insertion tube portion 2, You may comprise this lock ring 16 in the protrusion 6 in which the recessed part 7 of the push ring 5 can fit from the pipe radial direction outer side.
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]
In the first embodiment described above, the inlet pipe portion 1 of the fluid pipe P1 disposed on both sides of the intersection path location of the fluid piping system, and the inlet pipe portion formed on both ends of the bent fluid pipe (elbow) P2. 2 are connected by the pipe joint structure of the present invention. As shown in FIG. 8, one insertion pipe part 2 of the bending fluid pipe P2 and the receiving pipe part 1 of the one fluid pipe P1 are connected to the present invention. The other insertion tube part 2 of the bending fluid pipe P2 and the receiving pipe part 1 of the other fluid pipe P1 may be connected by another pipe joint structure.

  As shown in FIG. 8, another pipe joint structure used in the third embodiment includes an insertion pipe portion 2 formed on the other end side of the bending fluid pipe P2 and other fluids fitted and connected thereto. When both pipe parts 1 and 2 move relative to and away from the receiving pipe part 1 of the pipe P1 along the pipe axis X direction, they come into contact with each other from the pipe axis X direction and move further away. Detachment prevention means A for blocking, bending prevention means B for maintaining the inlet tube portion 1 of the bent fluid pipe P2 and the inlet tube portion 1 of the fluid pipe P1 in a coaxial core state, and the outer periphery of the inlet tube portion 2 An annular synthetic rubber sealing material 20 capable of sealing between the surface 2b and the inner peripheral surface of the receiving tube portion 1 is provided, and an outer peripheral surface 2b of the insertion tube portion 2, and Protrusions 2 for joining that are in contact with the end face of the receiving tube portion 1 from the tube axis X direction at a plurality of locations (four locations in the present embodiment) that are equally spaced in the circumferential direction. There has been formed.

  The disengagement prevention means A is formed in an annular mounting groove 22 formed on the inner peripheral surface of the receiving pipe portion 1 of the other fluid pipe P1 in a substantially C shape when viewed in the X direction of the pipe axis. A metal lock ring 23 that can be elastically deformed on the expanded diameter side, and an elastic retaining ring 24 that holds the lock ring 23 in a coaxial core state with the receiving pipe portion 1 in a state that allows the expanded diameter deformation thereof. And when both pipe parts 1 and 2 move relative to the tip of the outer peripheral surface 2b of the insertion pipe part 2 of the bending fluid pipe P2 more than a certain amount due to an earthquake or unequal subsidence. An annular retaining protrusion 25 is integrally formed so as to abut against the lock ring 23 from the direction of the tube axis X and prevent further relative disengagement of both the tube portions 1 and 2.

To constitute the bending preventing means B, the outer peripheral surface 2b of the insertion tube portion 2 of the bending fluid pipe P2, and the portion continuing to the bonding protrusion 21 and the circumferential intermediate portion thereof are connected to each other. A protrusion 26 having a protrusion smaller than that of the protrusion 21 is integrally formed, and the receiving tube portion 1 is made of a metal that can be elastically deformed toward the diameter-expanding side that contacts the plurality of protrusions 26 of the insertion tube portion 2. The bending prevention ring 27 and a plurality of set bolts 28 that are deformed by reducing the diameter of the bending prevention ring 27 by pressing a plurality of locations in the circumferential direction inward in the pipe radial direction.
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 the above-described embodiment, the pipe joint structure of the inlet pipe portion 1 of the fluid pipe P1 and the inlet pipe portion 2 of the bent fluid pipe (elbow) P2 arranged at the intersection path location of the fluid piping system. As described above, the technology of the present invention is applied to a pipe joint structure between fluid pipes arranged in a straight pipe path or a pipe joint structure between a fluid pipe and a connecting pipe portion of a fluid device (such as a gate valve or an air valve). May be applied.

  (2) As the fastening means 4, any structure may be used as long as it can be fastened and fixed while pulling the push wheel 5 and the receiving pipe portion 1 in the pipe axis direction.

(3) In the above-described embodiment, the protrusion 6 provided on the outer peripheral surface 2b of the insertion tube portion 2 in a state in which the concave portion 7 of the push ring 5 can be fitted from the outside in the tube diameter direction is formed in an annular shape or a C shape. Although it was configured in a letter shape, the protrusions 6 may be provided intermittently at a plurality of locations in the circumferential direction of the outer peripheral surface 2 b of the insertion tube portion 2.
In this case, you may comprise the structure where the recessed part 7 of the said push ring 5 does not connect in the circumferential direction.

  (4) In the above-described embodiment, the push wheel 5 is divided into two in the circumferential direction. However, the push wheel 5 may be divided into three or more, and the push wheel 5 may be mounted from the distal end side of the insertion tube portion 2. If possible, the push wheel 5 may be integrally formed in an annular shape.

  (5) In the above-described embodiment, the tapered inner peripheral surface 1 d of the receiving tube portion 1 in a state where the contact portion 10 of the receiving tube portion 1 and the contact portion 11 of the push wheel 5 are in contact with the push wheel 5. The taper surface 12 that is in contact with or close to the inner tube is formed, but a linear inner peripheral surface that is continuous with the same diameter is formed on the tapered inner peripheral surface 1d of the receiving pipe portion 1 at the maximum inner diameter portion. In addition, the pusher ring 5 is in contact with the linear inner peripheral surface of the receiving tube part 1 in an internally fitted state in a state where the contact part 10 of the receiving tube part 1 and the contact part 11 of the pusher wheel 5 are in contact with each other. You may implement by forming the adjacent bending control surrounding surface.

The half cross-section side view at the time of joining which shows 1st Embodiment of the pipe joint structure by this invention Cross-sectional side view of essential parts when disassembled Exploded perspective view Exploded front view of press ring Exploded rear view of press ring Sectional view taken along line VI-VI in FIG. The expanded sectional side view of the principal part which shows 2nd Embodiment of the pipe joint structure by this invention Partially cutaway side view during joining showing a third embodiment of the pipe joint structure according to the present invention

Explanation of symbols

P1 Fluid pipe P2 Bending fluid pipe X Pipe axis 1 Receiving pipe part 1d Tapered inner peripheral surface 2 Insertion pipe part 2b Outer peripheral face 3 Sealing material 4 Fastening means 5 Push ring 5A Divided push ring body 6 Protrusion 7 Recess 9 Pressing part 10 Contact part 11 Contact 12 Taper surface

Claims (5)

  A sealing material interposed between the tapered inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion is connected to the insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction. A press ring provided with a pressing portion that can be compressed from the axial direction is provided on the exterior, and fastening means for fastening and fixing the press ring and the receiving pipe portion are provided, and in the pipe axial direction of the receiving pipe portion and the press ring A contact portion that restricts the maximum compression position of the sealing material by the pressing portion of the push ring is formed at the opposing portions by abutting each other with the fastening and fixing operation of the fastening means, and further, the inner periphery of the push ring A pipe joint structure in which a recess is formed on the surface to be fitted from a radially outer side to a protrusion provided on an outer peripheral surface of the insertion tube part.   A sealing material interposed between the tapered inner peripheral surface of the receiving tube portion and the outer peripheral surface of the insertion tube portion is connected to the insertion tube portion that can be inserted and connected to the receiving tube portion from the tube axis direction. A push ring having a split structure having a pressing portion compressible from the axial direction is provided on the exterior, and fastening means for fastening and fixing the push ring and the receiving tube portion is provided, and a tube of the receiving tube portion and the press ring is provided. Abutting portions that restrict the maximum compression position of the sealing material by the pressing portion of the press wheel by contacting each other in accordance with the tightening and fixing operation of the fastening means are formed at the portions facing each other in the axial direction. The pipe joint structure in which the inner peripheral surface of the plurality of divided pusher bodies constituting the inner surface is formed with a recess that fits from the outer side in the pipe radial direction to the protrusion integrally formed on the outer peripheral surface of the insertion tube portion .   At least one end portion of the bending fluid pipe is formed with an insertion tube portion that can be inserted and connected to the receiving tube portion of the other fluid tube from the tube axis direction. The insertion tube portion includes the receiving tube portion. A push ring having a split structure having a pressing portion capable of compressing an annular sealing material interposed between the taper inner peripheral surface and the outer peripheral surface of the insertion tube portion from the tube axis direction is externally provided. Fastening means for fastening and fixing the fastening means is provided, and the parts opposite to each other in the tube axis direction of the receiving pipe part and the press ring are brought into contact with each other as the fastening means is tightened and fixed. A contact portion for restricting the maximum compression position of the sealing material by the pressing portion of the press ring is formed, and further, provided on the outer peripheral surface of the insertion tube portion on the inner peripheral surface of the plurality of divided press ring bodies constituting the press ring A tube in which a recess is formed that fits to the projected protrusion from the outside in the tube radial direction. Hand structure.   The pusher ring is formed with a tapered surface that is in contact with or close to the tapered inner peripheral surface of the receiving tube part in a state where the contact part of the receiving tube part and the contact part of the push wheel are in contact with each other. The pipe joint structure according to any one of claims 1 to 3.   5. When the plurality of divided pusher bodies constituting the pusher ring are mounted on the insertion tube, the concave part of the divided pusher body is formed to communicate with the concave part of another adjacent divided pusher body in the circumferential direction. The pipe joint structure according to any one of claims.

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