JP2010203516A - 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, a 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 pin hole 21 is formed in the push ring 11, the pin hole 21 has an opening 22 facing the inner peripheral surface of the push ring 11. A lock pin 23 is inserted into the pin hole 21, so that the peripheral surface of the lock pin 23 pushes the outer peripheral surface of the plug 1 through the opening 22. The plug 1 can be prevented from coming out of the socket 2 by the pushing pressure. Because the joint can be prevented from coming out competing against the non-average force by inserting the lock pin 23, the configuration can contribute to the reduction of labor and time so as to achieve the pipe joint structure. <P>COPYRIGHT: (C)2010,JPO&amp;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 FIG. 11, a rubber ring (water stop ring) 12 is inserted into an annular gap between the inner peripheral surface of the receiving port 2 and the outer peripheral surface of the insertion port 1. By pushing the rubber ring 12 with the push ring 11, 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 as shown by a symbol p in FIG. Cannot be formed. For this reason, when a so-called deformed pipe such as a bent pipe as shown by reference numeral p ′ in FIG. 12 or a T-shaped pipe or a Y-shaped pipe having a branching portion is used according to the form of the terrain or the road. 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. 12, 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 for concrete protection 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 pin hole is formed in the push ring, and the pin hole is formed on the push ring. While having an opening facing the inner peripheral surface, by inserting a lock pin into the pin hole, the peripheral surface of the lock pin presses the outer peripheral surface of the insertion port through the opening, The pipe joint structure is characterized in that the insertion port is prevented from coming out of the receiving port.

By inserting the lock pin, the outer surface of the insertion slot is pressed, and the reaction force is transmitted to the push ring. That is, the frictional force with respect to the relative movement of the insertion opening and the push ring in the tube axis direction increases. By increasing this frictional force, it is possible to suppress the insertion port from coming out of the receiving port. That is, it is possible to counter the non-average force in the direction of deviating from the joint portion generated by the fluid pressure so that the joint portion does not come out.
Since the non-average force can be countered by inserting the lock pin, it is possible to reduce the scale of the conventional concrete protection or to omit the concrete protection itself. 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 direction of the lock pin can be freely set as long as the peripheral surface of the lock pin presses the outer peripheral surface of the insertion port and the pressing prevents the insertion port from coming out of the receiving port. it can.

  Among them, in particular, the shaft center of the lock pin can be configured to be disposed in a plane orthogonal to the tube axis direction at the receiving port and the insertion port that constitute the joint portion. According to this configuration, since the axial direction of the lock pin is orthogonal to the movement in the tube axis direction in which the insertion port is about to escape from the receiving port, a higher effect of preventing the withdrawal can be expected.

Moreover, in each of these configurations, a taper surface that gradually increases in diameter from one shaft end side toward the axial center portion side can be provided on the peripheral surface of the lock pin.
With such a tapered portion, when the lock pin is inserted into the pin hole, the insertion is guided by directing the tapered portion toward the distal end side, and the subsequent pushing is light.
In this case, the degree of pressing against the outer peripheral surface of the insertion port by the tapered surface gradually increases with the insertion depth of the lock pin, and finally the predetermined pressing force is applied with the tapered surface hitting the outer peripheral surface of the insertion port. It can be set as the structure which leads to. This is convenient because the pressing force acting on the outer peripheral surface of the insertion slot is sufficient to prevent the joint from coming off at the axial position relative to the pin hole of the lock pin. is there.

  Moreover, when this lock pin presses the outer peripheral surface of the insertion port, the material of the insertion port can be plastically deformed by pressing the outer peripheral surface of the insertion port. At this time, the lock pin is preferably made of a material harder than the material of the outer peripheral surface of the insertion slot.

Furthermore, a groove is provided in the outer peripheral surface of the insertion opening before the lock pin is inserted, and the lock pin inserted into the pin hole can be configured to enter the groove.
If a groove is formed in advance on the outer peripheral surface of the insertion opening, the force required for inserting the lock pin can be reduced. In addition, even when a groove is formed in advance on the outer peripheral surface of the insertion opening, it can be set so as to be accompanied by the plastic deformation described above. Whether or not to accompany these plastic deformations, and how much plastic deformation is to be performed, can be set as appropriate depending on the depth and shape of the groove, the outer diameter of the lock pin, and the positional relationship between the two.

  Since the present invention can counter the average force by inserting the lock pin, it can be a pipe joint structure having a strength capable of countering the average force due to the internal fluid pressure without requiring much labor and time.

The first embodiment is shown, (a) is a side view, (b) is an AA cross-sectional view of (a), and (c) is a BB cross-sectional view of (a). The perspective view of the push ring and lock pin of 1st embodiment (A) (b) is the principal part enlarged view of FIG.1 (c). The details of the push ring are shown, (a) is a side view, (b) is a bottom view facing the radially outer side from the tube axis, and (c) is a sectional view from the front. Plan view showing the laying state of deformed pipe Side view showing the second embodiment The perspective view of the push ring and lock pin of 2nd embodiment Side view showing a modification of the push ring of the second embodiment (A) (b) is the principal part enlarged view which shows 3rd embodiment. (A) (b) is a principal part enlarged view which shows 4th embodiment. Sectional view showing a conventional pipe joint structure Plan view showing the laying state of a conventional deformed pipe

  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. 5, a joint portion 10 of a 45-degree bent pipe (deformed pipe) p 'of a water pipe 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. Moreover, the outer peripheral surface of the rubber ring 12 gradually increases from the rear end portion 12b side shown on the left side of FIGS. 1B and 1C toward the front end portion 12c side shown on the right side (as approaching the receiving port 2 side). The inclined surface 12a is reduced in diameter. 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 FIGS. 1B and 1C, an inclined surface 2a 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.

  The joint portion 10 includes a lock mechanism 20. As shown in FIG. 2, a pin hole 21 is first formed in the main body 11a of the push ring 11 in the configuration of the lock mechanism 20. In this embodiment, the pin hole 21 is formed in two places along the circumferential direction around the tube axis.

  Each pin hole 21 has end openings 21a and 21a whose both ends face the outer peripheral surface of the push ring 11, and in the middle between the end openings 21a and 21a, the pin hole 21 is formed on the inner peripheral surface of the press ring 11. It has an inner opening 22 facing it. As shown in FIGS. 4A and 4B, the inner opening 22 is formed elongated along the direction in which the pin hole 21 extends.

  In the portion where the inner opening 22 is provided, the member thickness (thickness in the radial direction) t2 of the main body portion 11a is slightly larger than the member thickness t1 of other portions, as shown in FIGS. It is formed thick. This thick portion of the member appears as a protruding portion 11g on the outer peripheral surface of the main body portion 11a.

  The end opening 21a, 21a of the pin hole 21 is opened near the circumferential end of the protruding portion 11g. For this reason, the formation of the pin hole 21 is considered so that the thickness of the main body portion 11a other than the protruding portion 11g (the portion having the member thickness t1) is hardly reduced.

  In a state where the tightening of the nut 14 is finished (in a state where the receiving port 2 and the insertion port 1 are watertightly connected), the lock pin 23 is inserted into the pin hole 21.

When the lock pin 23 is inserted, the outer peripheral surface of the lock pin 23 presses the outer peripheral surface of the insertion slot 1 through the opening 22.
As shown in FIG. 4 (a), when the lock pin 23 is inserted into the pin hole 21, the outer peripheral surface of the lock pin 23 is closer to the innermost diameter with respect to the tube axis c. This is because the position is slightly inward from the circular line r formed on the extension line of the inner peripheral surface (inner peripheral cylindrical surface) of the push ring 11 by a distance w.

  In the first embodiment, the distance w is set to 0.5 to 2.0 mm at the maximum. In addition, the inner diameter of the inner peripheral surface of the push ring 11 is set to a dimension that causes a slight gap with respect to the maximum intersection of the outer diameter of the insertion opening 1. In other words, a clearance is provided that allows the push ring 11 to be inserted into the outer periphery of the mouth 1. These dimensions can be appropriately determined according to the performance required for the joint 10 of the pipe.

  By inserting the lock pin 23, the outer peripheral surface of the insertion slot 1 is pressed as shown by an arrow D in FIG. 4A, and the reaction force is a push wheel as shown by an arrow E in the figure. 11 is transmitted. That is, when the outer peripheral surface of the insertion slot 1 is pressed, the inner peripheral surface of the push ring 11 is also pressed, and a frictional force is generated between the insertion slot 1 and the push ring 11.

  For this reason, when the insertion force 1 and the push ring 11 try to move relative to each other in the direction of the tube axis (see arrows a and b in FIG. 1B) due to the generation of the non-average force, the friction force Thus, it is possible to counter the pull-out force transmitted in the order of the insertion port 1, the lock pin 23, the push ring 11, the joining bolt 13 and the nut 14, and the receiving port 2 (see the arrows c and d). That is, it is possible to suppress the insertion port 1 from coming out of the receiving port 2.

  Since the non-average force can be countered by inserting the lock pin 23, the scale of concrete protection applied around the pipe can be reduced, or the concrete protection itself can be omitted.

At this time, as shown in FIGS. 4 (a) and 4 (b), the peripheral surface of the lock pin 23 faces from the one axial end side toward the middle in the axial direction, that is, toward the portion that contacts the outer peripheral surface of the insertion slot 1. A tapered portion 23c that gradually increases in diameter is provided. Moreover, the back of the taper part 23c becomes the column-shaped parallel part 23b which continues with the same outer diameter. The outer peripheral surface of the lock pin 23 that hits the outer peripheral surface of the insertion slot 1 in the state where the lock pin 23 is completely pushed in is the outer peripheral surface of the parallel portion 23b.
With such a tapered portion 23c, when the lock pin 23 is inserted into the pin hole 21, the insertion is guided by directing the tapered portion 23c toward the distal end side. Pushing until 23b hits the outer peripheral surface of the insertion slot 1 is also light.

  The shaft center 23 a of the lock pin 23 inserted into the pin hole 21 is disposed in a plane orthogonal to the tube axis direction of the receiving port 2 and the insertion port 1. Further, since the direction of the shaft center 23a is parallel to the tangential direction at one contact of the outer peripheral surface of the insertion port 1, or parallel to the tangential direction, the insertion port 1 tends to come out from the receiving port 2 in the tube axis direction. With respect to the movement, the direction of the axis 23a of the lock pin 23 becomes a direction orthogonal, and a higher effect of preventing the withdrawal can be expected.

In this embodiment, the lock pin 23 is disposed so that the direction of the axis 23a of the lock pin 23 is located in a plane perpendicular to the tube axis direction of the receiving port 2 and the insertion port 1. The direction of the axis 23a of the lock pin 23 is not limited to this embodiment as long as it can counter the movement in the tube axis direction from which the insertion port 1 is about to come out from the receiving port 2.
For example, the direction of the axis 23a of the lock pin 23 may be a direction that intersects a plane orthogonal to the tube axis direction of the receiving port 2 and the insertion port 1.

  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)
6 and 7 show a second embodiment. In this embodiment, the two lock pins 23 are arranged along the circumferential direction around the tube axis in the first embodiment, but a total of 6 locks are arranged along the circumferential direction around the tube axis. Pins 23 are arranged. As the number of the lock pins 23 increases, the ability to prevent the receiving port 2 and the insertion port 1 from coming off increases.

  Further, in order to arrange a total of six lock pins 23, as shown in FIG. 6, the push ring 11 is provided with six pin holes 21. In this embodiment, six pin holes 21 are provided in the equally divided direction along the circumferential direction.

  In addition, when arrange | positioning the several lock pin 23 with respect to the joint part 10 of one location, it is desirable that all the lock pins 23 are arrange | positioned in this way, but only a specific direction is mentioned. When it is desired to emphasize the effect of retaining, for example, the predetermined retaining effect can be exhibited even if the lock pin 23 is not necessarily arranged in an equal direction.

  In addition, since the number of the lock pins 23 can be freely selected according to the performance required for the joint portion 10, for example, only one lock pin 23 may be disposed for one joint portion 10 or around the tube axis. Three, four, five, six, or more may be arranged along the circumferential direction.

FIG. 8 shows a modification of the push wheel 11 of the second embodiment. The push ring 11 of this modification is a lighter one by changing the side view shape of the flange portion 11b.
Specifically, as shown in FIG. 8, the flange portion 11b has an annular portion formed around the through hole 11d through which the joining bolt 13 is inserted, that is, an annular portion 11e adjacent to the circumferential direction. It has a connecting portion 11f that connects the portions 11e, 11e.

  In this modification, since the radial height of the member is reduced in the connecting portion 11f compared to the push wheel 11 of FIG. 6 showing the second embodiment, the weight of the push wheel 11 as a whole is reduced. Can be planned.

(Third embodiment)
FIG. 9 shows a third embodiment. In this embodiment, the lock pin 23 presses the outer peripheral surface of the insertion slot 1 to plastically deform the material of the insertion slot 1. In each of the above-described embodiments, the distance w is absorbed by the elastic deformation of the outer peripheral surface of the insertion port 1, the lock pin 23, and the push ring 11 without plastic deformation on the outer peripheral surface of the insertion port 1. I was trying to do that. Even when plastic deformation of the material of the insertion slot 1 is allowed, the lock pin 23 and the push ring 11 may be accompanied by elastic deformation.

  In the third embodiment, plastic deformation of the insertion slot 1 causes plastic deformation of the outer peripheral surface of the insertion slot 1 when the lock pin 23 is inserted into the pin hole 21 as shown in FIG. A recess 24 is formed. When the lock pin 23 is caught in the recess 24, an even higher removal prevention effect can be expected.

  In this embodiment, since the material of the lock pin 23 is a material harder than the material of the outer peripheral surface of the insertion port 1, that is, the material of the pipes p and p ′, plastic deformation occurs. It has become easier.

(Fourth embodiment)
FIG. 10 shows a fourth embodiment. In this embodiment, a groove 25 is provided on the outer peripheral surface of the insertion slot 1 before the lock pin 23 is inserted, and the lock pin 23 inserted into the pin hole 21 is in the groove 25. It is the structure which goes into. When the lock pin 23 is caught in the groove 25, it is possible to expect an even higher removal prevention effect. Even in the configuration in which the groove 25 is provided, the above-described plastic deformation may be allowed.

DESCRIPTION OF SYMBOLS 1 Insertion port 2 Receiving port 4 Flange part 5 Screw hole 9, 10 Joint part 11 Push ring 11a Body part 11b Flange part 12 Rubber ring 13 Joining bolt 14 Nut 20 Lock mechanism 21 Pin hole 21a End opening 22 Inner opening 23 Lock pin 23a shaft center 23b parallel part 23c taper part 24 dent 25 groove p straight pipe (tubular body)
p 'deformed tube (tube)

Claims (7)

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 a push ring (11) is attached to the outer periphery of the insertion port (1), and the rubber ring (12) is pushed into the annular space by the push ring (11) and fixed.
A pin hole (21) is formed in the push ring (11), and the pin hole (21) has an opening (22) facing the inner peripheral surface of the push ring (11). 21) By inserting the lock pin (23) into the opening (22), the peripheral surface of the lock pin (23) presses the outer peripheral surface of the insertion port (1) through the opening (22). A pipe joint structure which prevents the insertion opening (1) from coming out from (2).   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 shaft center (23a) of the lock pin (23) is arranged in a plane perpendicular to the tube axis direction in the receiving port (2) and the insertion port (1). The pipe joint structure according to 1 or 2.   The taper surface (23a) which gradually expands in diameter from one axial end side toward the axial direction central portion side is provided on the peripheral surface of the lock pin (23). The pipe joint structure according to any one of the above.   The said lock pin (23) is carrying out the plastic deformation of the raw material of the insertion port (1) by pressing the outer peripheral surface of the said insertion port (1). The pipe joint structure according to one.   The pipe joint structure according to claim 5, wherein the lock pin (23) is made of a material harder than a material of an outer peripheral surface of the insertion port (1).   Before inserting the lock pin (23), a groove (25) is provided on the outer peripheral surface of the insertion port (1), and the lock pin (23) inserted into the pin hole (21) is The pipe joint structure according to any one of claims 1 to 6, wherein the pipe joint structure is inserted into the groove (25).

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