JP2010203580A - Pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint structure having strength competing with non-average force due to inside hydraulic pressure without requiring large labor and time. <P>SOLUTION: In the pipe joint structure, a plug 1 is inserted into a socket 2, a rubber ring 12 is interposed in an annular space between the inner peripheral surface of the socket 2 and the outer peripheral surface of the plug 1, an annular push ring 11 is attached to the outer periphery of the plug 1, and the rubber ring 12 is pushed and fixed with the push ring 11 into the annular space. A projection 21 directing radially inward is provided in the inner periphery of the push ring 11, a recess 22 is provided in the outer periphery of the plug 1, and the projection 21 is inserted into the recess 22, so that the plug 1 is prevented from coming out of the socket 2. The push ring 11 is formed annularly by connecting a plurality of arc-shaped members 15, 15 in the circumferential direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pipe joint structure of a fluid transportation pipe used for water supply, gas, sewerage and the like.

  In pipes for transporting various fluids such as water, gas, and sewerage, the pipes constituting the pipes form a receiving port with a slightly enlarged inner diameter at one pipe end and the other pipe end. In this case, an insertion port that can be inserted into the receiving port is formed. The joint part between the tubes inserts the insertion port of the other tube adjacent to the tube receiving port, into the annular gap between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port, Watertightness is maintained by interposing a rubber ring or the like.

For example, in the joint portion 9 of the duct pipe for water pipe shown in FIGS. 10 and 11, a rubber ring (water-stop ring) 12 is provided in an annular gap between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 1. And the rubber ring 12 is pushed in by the push ring 11, so that the receiving port 2 and the insertion port 1 are connected in a watertight manner.
With this configuration, a certain degree of expansion and contraction function in the tube axis direction between the pipe bodies p and p constituting the joint portion 9 and a function of preventing the separation between the pipe bodies p and p are exhibited (for example, Patent Documents). 1).

  In addition to the rubber ring 12, there is a structure in which a hard retaining ring is inserted into the outer surface of the mouth 1 in order to enhance the function of preventing separation between the pipes p, p (for example, Patent Document 1). 2, 3, 4).

  By the way, in a piping in an urban area where buildings and roads cross each other, a straight pipe body as indicated by a symbol p in FIG. 9, that is, a so-called straight pipe (hereinafter referred to as a tubular body p or a straight pipe p) is used to form a pipeline. Cannot be formed. For this reason, according to the topography and the form of the road, for example, a bent pipe as indicated by reference numeral p ′ in FIG. 9 or a so-called deformed pipe such as a T-shaped pipe or a Y-shaped pipe having a branching portion is used. There are many.

  These deformed pipes (hereinafter referred to as tube p 'or deformed pipe p') are moved in the direction in which the joint portion 9 is removed by the internal fluid pressure, for example, as indicated by arrow A in the figure. There is a tendency for external force (non-average force) to act.

  In order to prevent the pipe portion 9 from being piped off due to this non-average force, concrete protection may be provided around the joint portion 9. For example, as shown in FIG. 9, the concrete protection is performed by placing a concrete block 8 so as to surround the outer periphery of the joint portion 9 between the outer periphery of the deformed pipe p ′ and the straight pipe p before and after the deformed pipe p ′. .

  This is due to the frictional force generated between the concrete block 8 and the pipes p, p ′, etc. due to its own weight, and the passive earth pressure generated from the surrounding ground on the back of the concrete block 8. It is against power. In addition, the arrow B in a figure has shown the passive earth pressure, and the arrow C has shown the frictional force.

JP 2003-278967 A Japanese Utility Model Publication No. 51-54820 Japanese Utility Model Publication No. 52-41017 Japanese Utility Model Publication No. 56-37779

In order to perform this concrete protection, it is necessary to install a formwork and knead and cast concrete. In addition, a considerable curing period is required until the concrete hardens and exhibits a predetermined strength.
For this reason, after joining of a joint part, there exists a problem that much time and effort are required until it becomes possible to actually start water flow. The time and effort required to protect concrete is a cause of high costs, and also has a great influence on the construction period, so improvement is desired.

  Accordingly, an object of the present invention is to provide a pipe joint structure having a strength capable of resisting the non-average force due to the internal fluid pressure without requiring much labor and time.

  In order to solve the above problems, the present invention inserts an insertion port into a receiving port, interposes a rubber ring in an annular space between the inner peripheral surface of the receiving port and the outer peripheral surface of the insertion port, and inserts the insertion port. In a pipe joint structure in which a push ring is attached to the outer periphery of the mouth, and the rubber ring is pushed into the annular space with the push ring and fixed, a convex portion facing the inner diameter direction is provided on the inner circumference of the push ring, and the insertion The pipe joint structure is characterized in that a concave portion is provided on the outer periphery of the mouth, and the convex portion enters the concave portion to prevent the insertion port from coming out of the receiving port.

  Since the convex portion enters the concave portion, it is possible to prevent the insertion port from coming out of the receiving port and counter the above-mentioned non-average force generated in the pipe body, so that the scale of the conventional concrete protection can be reduced, or the concrete protection itself Can be omitted. For this reason, it can contribute to reduction of the effort and time for constructing a pipe joint structure.

This pipe joint structure can exhibit a predetermined effect even in a joint part between straight pipes, but has a relatively large non-average force, a so-called irregular shape such as a bent pipe or a T-shaped pipe having a branch part, a Y-shaped pipe, etc. The effect is particularly remarkable in a joint portion involving a pipe.
That is, the effect is remarkable when it is adopted in a joint portion between a deformed tube and a deformed tube or a joint portion between a deformed tube and a straight tube. In other words, at least one of the receiving port and the insertion port of the joint portion is provided at the tube end portion of the deformed tube.

  In each of these configurations, the push wheel may be formed in an annular shape by connecting a plurality of arcuate members along the circumferential direction.

Due to the fact that the press ring is divided in the circumferential direction, when the press ring is installed, the convex part of the press ring may bite into the outer surface of the insertion slot and damage it, or the outer coating applied for corrosion protection may be applied. This can prevent damage.
This is because when the push ring is integrally molded in an annular shape, an operation of fitting the annular push ring to the outer periphery of the insertion opening and aligning it in the tube axis direction occurs when attaching the push ring. This is because it is sufficient to move the divided members to the outer surface of the insertion opening from the outside in the pipe radial direction.

  In this way, when the push ring is constituted by a plurality of arc-shaped members, the arc-shaped members are connected to each other by overlapping the connecting portions provided at the ends of the arc-shaped members, and connecting the connecting portions to each other. It can be set as the structure performed by joining by.

  At this time, the connecting portions may be overlapped in the tube axis direction, or may be overlapped in the circumferential direction along the outer periphery of the insertion opening. When the connecting parts are overlapped in the tube axis direction, the axis of the connecting bolt is oriented in the tube axis direction. When the connecting parts are overlapped in the circumferential direction, the axis of the connecting bolt is inserted in the circumferential direction around the opening. It will turn.

Moreover, there exists the following as a structure of the common coupling part using a push ring.
That is, the push ring includes a cylindrical main body portion extending in the tube axis direction, and a flange portion that rises outward from the main body portion in the tube radial direction, and the front end of the main body portion contacts the rear end portion of the rubber ring. It is the structure which touches. A through hole and a screw hole extending in the tube axis direction are provided in the flange portion of the push ring, and a flange portion that rises outward in the tube diameter direction is provided at the end of the receiving port. The part is provided with a screw hole.

  As described above, in the configuration in which the receiving port and the push ring are respectively provided with the flange portions, the rubber ring is formed by screwing the nut into the joining bolt inserted through the through hole of the push ring and the screw hole of the receiving port. Further, a configuration is adopted in which the front end of the anti-bending bolt screwed into the screw hole of the push ring is in contact with the end surface of the flange portion of the receiving port. Can do.

  Since the front end of the bending prevention bolt hits the end surface of the flange portion of the receiving port, it is possible to more reliably prevent the insertion port from coming out of the receiving port.

  Since this invention can prevent the insertion port from coming out of the receiving port when the projecting portion enters the recessed portion, the tube has a strength capable of resisting the average force caused by the internal fluid pressure without requiring much labor and time. It can be a joint structure.

The first embodiment is shown, (a) is a side view, (b) is a sectional view of (a), and (c) is a side view of a push ring. (A) (b) is a perspective view of the push ring of the first embodiment. (A)-(e) is explanatory drawing which shows the procedure at the time of constructing a pipe joint structure Plan view showing the laying state of deformed pipe 2nd embodiment is shown, (a) is a side view, (b) is sectional drawing of (a). (A) (b) is a detailed view of the push ring of the second embodiment A third embodiment is shown, (a) is a side view, (b) and (c) are cross-sectional views of (a). Side view of the push ring of the third embodiment Plan view showing the laying state of a conventional deformed pipe Sectional view showing a conventional pipe joint structure Sectional view showing a conventional pipe joint structure

  A pipe joint structure according to an embodiment of the present invention will be described with reference to the drawings. Here, as shown in FIG. 4, a joint portion 10 of a 45-degree bent pipe (deformed pipe) p ′ of a water duct ductile pipe and a straight pipe p before and after the pipe is assumed. However, the joint part 10 to which this pipe joint structure can be applied is not limited to the joint part 10 of such a bent pipe p ', but can be adopted also for the joint part 10 of the deformed pipe p' having other forms. Of course, it can also be adopted for a joint portion between straight pipes p.

(First embodiment)
As shown in FIG. 1, the joint portion 10 of the first embodiment is integrated with an elastic body such as rubber in an annular gap between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 1. An annular rubber ring 12 formed between the two is interposed.

  The inner peripheral surface of the rubber ring 12 is a cylindrical surface and is in close contact with the cylindrical surface of the outer peripheral surface of the insertion slot 1. Further, the outer peripheral surface of the rubber ring 12 is an inclined surface 12a that gradually decreases in diameter from the rear end portion 12b side shown on the left side in FIG. 1 toward the front end portion 12c side shown on the right side (as it approaches the receiving port 2 side). It has become. This pipe joint structure is called a “K-type joint”. The symbol c in the figure indicates the tube axis center in the vicinity of the joint 10.

  An annular push ring 11 is attached to the outer periphery of the insertion slot 1 adjacent to the rear end 12 b side of the rubber ring 12. The push ring 11 includes a cylindrical main body portion 11a extending in the tube axis direction, and a flange portion 11b rising from the middle of the main body portion 11a to the outside in the tube radial direction. The front end 11c of the main body 11a is in contact with the rear end 12b of the rubber ring 12.

  A through hole 11 d extending in the tube axis direction is formed in the flange portion 11 b of the push ring 11. In addition, a flange portion 4 that rises outward in the pipe radial direction is provided at the end of the receiving port 2, and a screw hole 5 is formed in the flange portion 4. The number of through holes 11d of the push ring 11 and the number of screw holes 5 of the receiving port 2 are the same, and the corresponding through holes 11d and screw holes 5 are provided in the same direction around the tube axis and face the tube axis direction.

  As shown in FIG. 1, the joining bolt 13 is inserted into the through hole 11 d and the screw hole 5. A nut 14 is screwed into the joining bolt 13, and the nut 14 is tightened in a direction in which the flange portions 11 b and 4 approach each other. By this tightening, the front end 11c of the main body 11a of the push ring 11 pushes the rear end 12b of the rubber ring 12, and the rubber ring 12 is pushed into the annular gap.

At this time, as shown in FIG. 1 (b), an inclined surface 2 a that gradually approaches the inner diameter side is formed on the inner surface of the receiving port 2 as it goes toward the inner part. Further, the inclined surface 12 a of the rubber ring 12 is in sliding contact with the inclined surface 2 a of the receiving port 2.
For this reason, when the rubber wheel 12 is pushed into the inner part of the receiving port 2 by the pusher wheel 11, the rubber wheel 12 is gradually moved over the entire circumference along with the sliding between the inclined surfaces 2a and 12a. The degree of close contact between the inner surface of 2 and the outer surface of the insertion port 1 is increased, and the receiving port 2 and the insertion port 1 are finally connected in a watertight manner.

  The tightening with the nut 14 is performed when the front end 12c of the rubber ring 12 abuts on the step 2b provided in the back of the inclined surface 2a of the receiving port 2 so that the rubber ring 12 and the receiving port 2 are connected. The inner surface and the outer surface of the insertion slot 1 are set to have a predetermined degree of close contact, and are set to end.

  In addition, the joint portion 10 is provided with a lock mechanism 20 that restricts relative movement of the push ring 11 and the insertion port 1 in the tube axis direction. As shown in FIGS. 1B and 2A and 2B, the lock mechanism 20 has a convex portion 21 that protrudes toward the inner diameter direction on the inner periphery of the push ring 11. Yes. In this embodiment, the convex portion 21 is a ridge formed continuously with the same width and the same protruding height over the entire circumference around the tube axis. Moreover, in this embodiment, the center line direction of the protrusion is disposed in a plane orthogonal to the tube axis direction of the receiving port 2 and the insertion port 1 constituting the joint portion 10.

  A recess 22 is provided on the outer periphery of the insertion slot 1. The recess 22 is a groove formed continuously with the same width and the same depth over the entire circumference around the tube axis. Moreover, in this embodiment, the center line direction of the groove | channel is arrange | positioned in the surface orthogonal to the pipe-axis direction in the said receiving port 2 and the said insertion port 1 which comprises the joint part 10. As shown in FIG.

The width and depth of the concave portion 22 are such that the convex portion 21 can enter smoothly. After the convex portion 21 enters the concave portion 22, the outer peripheral surface of the insertion port 1 and the inner peripheral surface of the push ring 11 are in surface contact, and the concave portion 22 and the convex portion 21 mesh with each other. 1 and the push ring 11 do not rattle.
However, a slight gap may be interposed between the two in the width direction so that the convex portion 21 can smoothly enter the concave portion 22.

  Thus, when the convex part 21 of the inner periphery of the push ring 11 enters into the concave part 22 of the outer periphery of the insertion slot 1, the force (FIG. 1 (b) arrow) a), b, and arrows c, d), the convex portion 21 and the concave portion 22 mesh with each other to counter the pull-out force. That is, the convex portion 21 enters the concave portion 22 to prevent the insertion port 1 from coming out of the receiving port 2 and can counter the above-mentioned non-average force generated in the pipes p and p ′. The scale can be reduced or the concrete protection itself can be omitted. For this reason, it contributes to the reduction of the effort and time for constructing a pipe joint structure.

  The construction method of the joint portion 10 having this pipe joint structure will be described with reference to FIG. 3. First, as shown in FIGS. 3 (a) to 3 (b), a rubber ring 12 is fitted on the outer periphery of the insertion opening 1. Install.

  Next, the push ring 11 is attached to the rear end side of the rubber ring 12 as shown in FIG. As shown in FIGS. 1 (c) and 2, the push ring 11 is constituted by a pair of arc-shaped members 15, 15 having a cylindrical member (corresponding to the main body portion 11 a) on the inner peripheral side thereof. .

In other words, the push ring 11 is formed in a ring shape by connecting semicircular arc-shaped members 15 and 15 via connecting portions 15a and 15a provided at the ends thereof.
The connecting portions 15a and 15a have a plate shape having a flat surface in the tube axis direction, and have through holes 15b and 15b that respectively penetrate the plate-like portions on the front and back sides.

The connecting portions 15a and 15a are overlapped in the tube axis direction so that the corresponding through holes 15b and 15b are at the same position. Further, the connecting bolt 16 is inserted into the through holes 15b and 15b and tightened with the nut 16a to connect the arcuate members 15 and 15 in an annular shape (see FIG. 2B). Since the connecting bolt 16 is also inserted into the screw hole 5 provided in the flange portion 4 of the receiving port 2, the same function as the joining bolt 13 and the nut 14 is exhibited by tightening the nut 16 a. Yes.
In addition, regarding this connection bolt 16 and nut 16a, do not pass through the screw hole 5 of the receiving port 2 (not having the same function as the joining bolt 13 and the nut 14), and exclusively connect the arc-shaped members 15 and 15 to each other. You may employ | adopt the structure aiming only at connecting cyclically | annularly.

As shown in FIGS. 3C to 3D, the nut 16a is tightened so that the projection 21 enters the recess 22 so that the insertion slot 1 and the push ring 11 do not move. Fixed. Finally, as shown in FIGS. 3D to 3E, a nut 14 is fastened to the joining bolt 13.
At this time, the tightening degrees of the connecting bolt 16 and the nut 16a, and the joining bolt 13 and the nut 14 are not tightened all at once, but gradually while maintaining the equal tightening force. It is possible to adopt a technique of alternately tightening little by little so that 12 is pushed into the annular space.

  Thus, when the push ring 11 is divided | segmented into the circumferential direction, when attaching the push ring 11, the push ring 11 is the outer periphery of the insertion port 1 as shown by the arrow in FIG.3 (c). What is necessary is just to apply to a surface, and it is not necessary to slide and align in a pipe-axis direction. Therefore, it is possible to prevent a situation in which the convex portion 21 of the push ring 11 bites into and damages the outer peripheral surface of the insertion slot 1 or damages the outer surface coating applied for corrosion prevention. Further, the positioning of the concave portion 22 and the convex portion 21 is also easy.

  Furthermore, in this embodiment, the direction of the center line of the ridge that forms the convex portion 21 and the direction of the center line of the groove that forms the concave portion 22 are the tube axis direction of the receiving port 2 and the insertion port 1. It arrange | positions in the surface orthogonal to. For this reason, when the non-average force A is generated, the center line direction is orthogonal to the movement in the tube axis direction from which the insertion port 1 is about to come out from the receiving port 2, and the higher withdrawal force is obtained. The prevention effect can be expected.

  As a modification thereof, the direction of the center line of the ridge that forms the convex portion 21 and the direction of the center line of the groove that forms the concave portion 22 with respect to the tube axis direction of the receiving port 2 and the insertion port 1 are as follows. Even in the direction intersecting with the orthogonal plane, if the convex portion 21 is engaged with the concave portion 22, the effect of preventing the predetermined slipping out can be exhibited.

  In this embodiment, the flange portion 11b of the push ring 11 rises from the middle of the main body portion 11a in the tube axis direction. However, the flange portion 11b has a rear end portion of the main body portion 11a as in the conventional example. A case of rising from the vicinity is also assumed, and the present invention is not limited to the push ring 11 having the shape of this embodiment. The same applies to each embodiment described later.

(Second embodiment)
A second embodiment is shown in FIGS. In this embodiment, the form of the connecting portions 15a and 15a of the respective arcuate members 15 and 15 is changed with respect to the first embodiment.

That is, the push ring 11 is configured such that the semicircular arc-shaped members 15 and 15 are connected to each other via connecting portions 15a and 15a provided at the end portions thereof to form an annular shape. This is the same as in the first embodiment.
The connecting portions 15a and 15a have a plate shape having a flat surface in a direction orthogonal to the circumferential direction around the tube axis c, and have through holes 15b and 15b penetrating through the plate-like portions on the front and back sides, respectively. . In this embodiment, the surface direction of the flat surface of each connecting portion 15a is a surface direction passing through the tube axis c (a direction perpendicular to the circumferential direction around the tube axis c), but the surface direction is opposite. As long as the connecting portions 15a, 15a can be overlapped with each other and can be tightened with the connecting bolt 16 and the nut 16a, the connecting portions 15a may be in any direction.

  The connecting portions 15a and 15a are overlapped in the circumferential direction around the insertion slot 1 so that the corresponding through holes 15b and 15b are at the same position. Further, the connecting bolt 16 is inserted into the through holes 15b and 15b and tightened with the nut 16a to connect the arcuate members 15 and 15 in an annular shape (see FIG. 5A). Since the handling of the joining bolt 13 and the nut 14 is the same as that in the above-described embodiment, the description thereof is omitted.

(Third embodiment)
A third embodiment is shown in FIGS. In this embodiment, an anti-bending bolt 17 is provided between the push wheel 11 and the receiving port 2.

  In this embodiment, the flange portion 11b of the push wheel 11 is provided with a plurality of screw holes 11e extending in the tube axis direction along the circumferential direction. In this embodiment, the through holes 11d corresponding to the joining bolts 13 and the screw holes 11e are alternately arranged one by one along the circumferential direction.

  A bending prevention bolt 17 is screwed into the screw hole 11e from the insertion port 1 side toward the receiving port 2 side. Further, the front end 17 b of the bending prevention bolt 17 is in contact with the end surface of the flange portion 4 of the receiving port 2 on the insertion port 1 side.

  In this way, the front end 17b of the bending prevention bolt 17 hits the end surface of the flange portion 4 of the receiving port 2, so that the insertion port 1 can be more securely pulled out from the receiving port 2 due to the generation of the non-average force. Can be prevented. For example, the bending prevention bolt 17 and the flange portion 4 of the receiving port 2 can counter the external force in the bending direction as indicated by arrows e and f in the figure as indicated by arrows g and h.

  The construction method of the joint portion 10 having this pipe joint structure will be described. The through hole 11d of the press ring 11 and the screw hole 5 of the receiving port 2 are processed in the same manner and procedure as those shown in FIGS. 3 (a) to 3 (e). The rubber ring 12 is pushed into the annular space by screwing the nut 14 into the joining bolt 13 inserted through (see FIG. 7B).

  After that, as shown in FIG. 7C, the bending prevention bolt 17 is screwed into all the screw holes 11e of the push ring 11, and the front end 17b is brought into contact with the end face of the flange portion 4 of the receiving port 2. Is completed.

In addition, in this embodiment, although the joining bolt 13 and the bending prevention bolt 17 are arrange | positioned alternately along the circumferential direction, the arrangement | positioning can be set freely. For example, along the circumferential direction, the joining bolt 13, the bending prevention bolt 17, the bending prevention bolt 17, the joining bolt 13, the bending prevention bolt 17, the joining bolt 13,. Two anti-bending bolts 17 may be arranged between the two anti-bending bolts. Conversely, two joining bolts 13 may be arranged between the anti-bending bolts 17 and 17 adjacent in the circumferential direction.
In addition, when employ | adopting the bending prevention volt | bolt 17, about the form of the connection part 15a of the push ring 11, things other than the aspect shown in FIG.7 and FIG.8 can also be employ | adopted. For example, what is shown in FIG.5 and FIG.6 may be sufficient, and the push ring 11 integrally formed in cyclic | annular form may be sufficient.

In each of the above embodiments, with respect to the aspect of the convex portion 21 and the concave portion 22, the convex portion 21 is a ridge formed continuously with the same width and the same protruding height over the entire circumference around the tube axis. The center line direction of the protrusion is arranged in a plane orthogonal to the tube axis direction in the receiving port 2 and the insertion port 1 constituting the joint portion 10. Further, the concave portion 22 on the outer periphery of the insertion port 1 is a groove that is formed continuously with the same width and the same depth over the entire circumference around the tube axis, corresponding to the convex portion 21. .
As another aspect of this convex part 21 and the recessed part 22, it is good also as an aspect from which the width | variety and protrusion height of the convex part 21 which consist of a protrusion, or both change in the middle along the circumferential direction, for example. At this time, it is needless to say that the concave portions 22 made of the corresponding grooves can be adapted so that the convex portions 21 can enter smoothly. If it does in this way, the attachment azimuth | direction (direction around the pipe axis c) of the push ring 11 with respect to the insertion slot 1 will be determined.

  Further, the center line direction of the ridges and grooves in each of these aspects is arranged in a direction intersecting with a plane orthogonal to the tube axis direction of the receiving port 2 and the insertion port 1 constituting the joint portion 10. May be.

  Furthermore, the convex portion 21 may not be continuous along the circumferential direction but may be intermittent. Moreover, you may provide the single or several convex part 21 in the arbitrary positions of the internal peripheral surface of the push ring 11. FIG. In each aspect, the concave portion 22 is of course the shape, size, and position corresponding to the convex portion 21.

  Further, in each of the above embodiments, the push ring 11 is configured by using two semicircular arc-shaped members 15 in pairs. However, the push ring 11 may be integrally formed in an annular shape, The push ring 11 may be configured by connecting the arcuate members 15 formed of one set, four sets, or more in a ring shape.

DESCRIPTION OF SYMBOLS 1 Insertion port 2 Receiving port 4 Flange part 5 Screw hole 9,10 Joint part 11 Push ring 11a Main body part 11b Flange part 11d Through-hole 11e Screw hole 12 Rubber ring 13 Joint bolt 14 Nut 15 Arc-shaped member 16 Connection bolt 17 Prevention of bending Bolt 17b Front end 20 Lock mechanism 21 Convex part (ridge)
22 Recess (groove)
p Straight pipe (tube)
p 'deformed tube (tube)

Claims (5)

The insertion opening (1) is inserted into the receiving opening (2), and a rubber ring (12) is interposed in the annular space between the inner peripheral surface of the receiving opening (2) and the outer peripheral face of the insertion opening (1). In the pipe joint structure in which an annular push ring (11) is attached to the outer periphery of the insertion opening (1), and the rubber ring (12) is pushed into the annular space by the push ring (11) and fixed.
A convex portion (21) facing the inner diameter direction is provided on the inner periphery of the push ring (11), and a concave portion (22) is provided on the outer periphery of the insertion port (1), and the convex portion (21) is the concave portion (22). The pipe joint structure is characterized in that the insertion port (1) is prevented from coming out of the receiving port (2) by entering.   The pipe joint structure according to claim 1, wherein the receiving port (2) or the insertion port (1) is provided at a pipe end portion of a deformed pipe.   The pipe joint according to claim 1 or 2, wherein the push ring (11) is formed in an annular shape by connecting a plurality of arc-shaped members (15, 15) along a circumferential direction. Construction.   The arc-shaped members (15, 15) are connected to each other by overlapping the connecting portions (15a, 15a) provided at the ends of the arc-shaped members (15, 15), and connecting the connecting portions (15a, 15a) to each other. The pipe joint structure according to claim 3, wherein the pipe joint structure is performed by joining with a connecting bolt (16). The push ring (11) includes a cylindrical main body portion (11a) extending in the tube axis direction, and a flange portion (11b) rising from the main body portion (11a) in the tube radial direction, and the main body portion (11a). ) Is in contact with the rear end (12b) of the rubber ring (12),
A through hole (11d) and a screw hole (11e) extending in the tube axis direction are provided in the flange portion (11b) of the push ring (11), and the outer end in the tube radial direction is provided at the end of the receiving port (2). A flange portion (4) that rises to the flange portion (4) of the receiving port (2) is provided with a screw hole (5),
By screwing a nut (14) into a joining bolt (13) inserted through the through hole (11d) of the push ring (11) and the screw hole (5) of the receiving port (2), the rubber ring (12 ) Is pushed into the annular space, and the front end of the anti-bending bolt (17) screwed into the screw hole (11e) of the push ring (11) is the flange portion of the receiving port (2). The pipe joint structure according to any one of claims 1 to 4, wherein the pipe joint structure is in contact with an end face of (4).

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