JPH07117181B2 - Device for preventing expansion and contraction of flexible pipe joints - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing the pipe from being pulled out of a pipe joint, which is provided with stretchability and flexibility within a certain range by using a stop ring and a stop nut. To prevent foreign matter from entering the expansion and contraction flexibility imparting space between the stop ring and the stop nut, or to prevent the worker from performing work without securing the necessary expansion and contraction amount at the time of joining work. It is related to the technology.

[0002]

2. Description of the Related Art The present applicant has already developed the technique of Japanese Patent Application No. 55-171887 as a pipe joint excellent in stretchability and flexibility of this kind. This prior application technique is as shown in the exploded perspective view of FIG. 7 and the partial vertical sectional view of FIG. That is, the inner diameter of the tapered receiving portion 3 is set to be larger than the outer diameter of the joining pipe 1, and the joint main body 2 in which the central portion in the axial direction swells like a drum and a wide cavity 4 is formed inside is prepared. The insertion opening 5 of the joint pipe 1 is inserted into the receiving opening 3.

Then, a sealing rubber packing 6 is fitted between the outer peripheral surface of the insertion opening of the joint body 2 and the receiving portion 3 of the joint body 2, and is pushed into the joint body 2 from behind by a push ring 7. I have to. This pushing is performed by the bolt hole 9 of the projecting portion 8 formed on the outer periphery of the end surface of the joint body 2 and the bolt hole 9
To the bolt hole 10 of the push ring 7 corresponding to
Is carried out and tightened with the stop nut 12.

The stop nut 12 is composed of a polygonal portion 12a, a collar portion 12b and a tubular portion 12c. This allows
The outer peripheral wedge surface and the inner peripheral wedge surface of the rubber packing 6 are pressed between the tapered receiving portion 3 of the joint body 2 and the outer peripheral surface of the joint pipe 1, so that the joint pipe 1 and the joint body 2 are concentric with each other. Is held at the same time and seals the leakage of fluid from the connection site.

In this state, the pipe end of the joint pipe 1 is
It can move freely in the cavity 4 of the joint body 2 without interfering with the inner wall of the joint body 2, can bend with respect to the axis of the joint body 2, and has flexibility. There is. However, it is weak against the tensile force acting in the axial direction of the joint pipe 1, and there is a risk that it will fall out easily. Therefore, in this pipe joint that the applicant previously applied,
In addition to having flexibility, the following expansion / contraction measures are taken in the axial direction.

That is, the inner diameter is slightly larger than the outer diameter of the joint pipe 1, it is thin and wide, and a part of the circumference is notched, and the ribs 1 face each other at both ends of the notched opening.
A stop ring 14 including 3 and 13 is prepared, and the stop ring 14 is externally fitted to the joint pipe 1 on the back side of the push ring 7. Then, the tightening bolt 15 is inserted into the bolt holes 16 of the ribs 13 and the nut 17 is fastened to fix the stop ring 14 to the joint pipe 1.

On the outer peripheral portion of the stop ring 14, there are formed stop plates 18, 18 having a recessed portion 18a corresponding to the cylindrical portion 12c of the stop nut 12. The stop plates 18 and 18 are provided on the push ring 7.
And the flange portion 12b of the stop nut 12 are located between them.

Assuming now that a tensile force in the axial direction acts on the joint pipe 1, the stop ring 14 operates integrally with the joint pipe 1, and the stop plates 18, 18 of the stop ring 14 are connected to the collar portion 12b of the stop nut 12. It is locked to and prevented from coming off. Therefore, the joint pipe 1 is provided with the stop plates 18, 1
It is possible to extend and contract with respect to the joint body 2 by the amount that the ring 8 can move between the push ring 7 and the collar portion 12b of the stop nut 12.

Further, the present applicant has already developed the technology of the expansion and contraction flexible pipe joint of Japanese Utility Model Application No. 63-48972 shown in FIGS. 9 and 10 which is a further improvement of the above-mentioned prior application. This technology
A flange 21 is provided on the outer circumference of the pipe end of the joint body 2, and four bolt holes 22 are formed in the flange 21. The push ring 7 for pushing the sealing rubber packing 6 into the receiving portion 3 of the joint body 2 is also provided with a flange 23 and four bolt holes 24 corresponding to the joint body 2. 25
Is a stop plate of the stop ring 14.

In this pipe joint, two connecting members 2 are provided on the rear surface side of the push ring 7 and on the outer peripheral surface side of the stop ring 14.
6 and 26 are arranged. The connecting members 26, 26 are formed by a leg portion 27 joined to the bolt hole 24 of the push wheel 7 and an arm 28 connecting the two leg portions 27. Bolt holes 29 are formed in the leg portions 27. Further, the arm 28 has a U shape in a plan view,
When the connecting members 26, 26 are connected and fixed to the push wheel 7, the stop plate 25 of the stop ring 14 forms a flexible space 30 in which the stop plate 25 can freely move.

Further, the arm 28 has a curved surface portion 31 corresponding to the outer peripheral surface side of the stop ring 14. Furthermore, the nut 32 screwed to the tightening bolt 11 is formed by the corner portion 32a and the tubular portion 32b.

In the prior arts shown in FIGS. 9 and 10, the plate 25 of the stop ring 14 is, as shown in the figure, the push ring 7 and the arms 28 of the connecting members 26, 26.
It is located in the flexible space 30 formed between the flexible space 28 and 28, and can freely move in this space region.
Therefore, even if a tensile force acts on the joint pipe 1, the joint pipe 1 freely expands and contracts with respect to the joint body 2 and bends in the range where the stop plate 25 exists between the space regions 30, 30. It is possible. Of course, the plate 25 of the stop ring 14 is connected to the arm 2 of the connecting member 26.
After abutting against 8, the joint pipe 1 is prevented from coming off.

[0013]

[Problems to be Solved by the Invention]
In the prior application technology of No. -171887 (hereinafter referred to as the former), a space for expansion and contraction of the joint pipe 1 is formed between the collar portion 12b of the stop nut 12 and the push ring 7. Further, in the prior application technique (hereinafter referred to as the latter) of Japanese Utility Model Application No. 63-48972, the arm 28 of the connecting member 26 and the push wheel 7 are provided.
A space for expansion and contraction of the joint pipe 1 is formed between and.

In the expansion / contraction flexible space, in order for the joint pipe 1 to be able to expand and contract in both the front and rear directions in the axial direction, in the former case, the flange portion 12c of the stop nut 12 is used.
It is necessary that a space be formed between the stop plate 18 and the stop plate 18, and between the plate 18 and the push wheel 7. In the latter case, the arm 28 of the connecting member 26 and the stop plate 2
It is necessary that a space be formed between the plates 5 and between the plate 25 and the push ring 7.

However, when constructing these pipe joints, it is necessary to fix the stop ring 14 to the joint pipe 1 first and then tighten the push ring 7 as a procedure.
Therefore, in the former case, the operator mistakenly stops the stop nut 1
The second collar portion 12b and the stop plate 18 of the stop ring 14 may be fastened in contact with each other. In the latter case, the arm 28 of the connecting member 26 and the stop plate 25 of the stop ring 14 may be brought into contact with each other and fastened.

Therefore, in both of the prior application techniques, there is a drawback that the joint pipe 1 cannot be moved leftward in FIGS. 8 and 10, which may lead to breakage of the joint.

In addition, the collar portion 12b of the stop nut 12,
When the work for fastening the push wheel 7 with the fastening bolts 11 is performed in the state where the stop plate 18 of the stop ring 14 is in contact and the state where the arm 28 of the connecting member 26 and the stop plate 25 of the stop ring 14 are in contact, when the push wheel 7 advances. There is also a fatal drawback for this type of pipe joint in that the operation is hindered by the stop plates 18, 25, and the sealing property of the rubber packing 6 cannot be ensured.

Further, although this type of pipe joint is often buried in soil, in this case, soil or stone is caught in the space for expansion and contraction of the joint pipe 1, and the collar portion is formed. 12b
And the stop plate 18 or the arm 28 and the stop plate 25 were in contact with each other, and sufficient expansion and contraction flexibility of the joint pipe 1 was not obtained.

[0019]

DISCLOSURE OF THE INVENTION The present invention has been made by improving the prior art in view of the above-mentioned problems, and by interposing a styrofoam in the space for expansion and contraction of the joint pipe, the operator can make a mistake. Another object of the present invention is to provide a pipe joint that prevents the occurrence of construction work and can perform a reliable expansion and contraction flexible operation even in soil.

Thus, the first means adopted by the present invention to solve the above-mentioned problems is to insert a threadless joint pipe into a pipe or a joint body having a tapered receiving portion to form an annular shape. In a flexible expansion and contraction joint in which a rubber packing is inserted and tightened to a pipe or a joint body by bolts and nuts which are tightening means of the push ring, a stop ring having a stop plate on the back side of the push ring of the joining pipe. And the stop nut having a collar portion is screwed onto the tightening bolt of the push wheel to secure a space for expansion and contraction between the collar portion of the stop nut and the push ring. A stopper device for an expansion and contraction flexible pipe joint, wherein the stop plate is interposed in a space for use, and styrofoam is interposed between the stop plate and the flange portion of the stop nut.

The second means adopted by the present invention is to insert a threadless joint pipe into a pipe or a joint body having a tapered receiving portion, insert a ring-shaped rubber packing, and insert and insert the ring-shaped rubber packing. In an expansion and contraction flexible pipe joint which is tightened to a pipe or a joint body by a tightening means such as a bolt and a nut, a stop ring having a stop plate is externally fitted and mounted on the back side of a push ring of the joint pipe, and is seen in a plan view. In a state of U-shape, the central arm fastens the connecting member located on the back side of the stop plate to the push ring, and secures a space for expansion and contraction between the arm of the connecting member and the push ring. A device for preventing expansion and contraction of flexible pipe joints, wherein Styrofoam is interposed between the stop plate and the arm of the connecting member.

[0022]

In any of the first and second means of the present invention, expanded polystyrene is interposed in the space for expansion and contraction of the joint pipe. Therefore, in the construction work, if the push ring is tightened and the stop plate of the stop ring is fastened at the position where the stop plate is in contact with the styrofoam, the joining pipe that can move in any direction can be connected. That is, it is possible to reliably secure the expansion and contraction flexible operation.

During the expansion and contraction flexible operation, the Styrofoam is crushed and does not hinder the expansion and contraction flexible operation of the joint pipe.

Further, by interposing styrofoam in this way, even when buried in soil, soil and stones do not bite into the space for expansion and contraction, and a reliable expansion and contraction operation is possible. It is possible to secure.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. 1 and 2 show a first embodiment according to the first means of the present invention.
2 is a partial vertical sectional view of the pipe joint, and FIG. 2 is a perspective view of the polystyrene foam 33.

As shown in the figure, the styrofoam 33 of this embodiment has a donut shape. The Styrofoam 33 has a predetermined thickness, and is externally fitted and attached to the cylindrical portion 12c of the stop nut 12. The thickness may be set to the minimum required width for expansion and contraction of the joint pipe 1. In this embodiment, the joint pipe 1 has the same thickness as the allowable dimension for moving to the left in FIG. Other configurations are the same as in the case of the prior application technique shown in FIGS. 7 and 8.

In the work for constructing the pipe joint, first, the stop ring 14 is externally fitted and attached to the joining pipe 1 in a loosely fitted state, and subsequently, the push ring 7 and the rubber packing 6 are externally fitted and attached, and then joined in this state. The tip side of the tube 1 is inserted into the cavity 4 of the joint body 2. Then, the fastening bolt 11 is inserted into the bolt holes 9 and 10 of the joint body 2 and the push ring 7, and the Styrofoam 33 is inserted into the cylindrical portion 12c.
The stop nut 12 attached to the fastening bolt 11 is screwed onto the fastening bolt 11. In the stop nut 12, the tip end surface of the tubular portion 12c abuts on the push wheel 7 and advances the push wheel 7, thereby pressing and compressing the rubber packing 6 in the right direction, thereby exhibiting a sealing action.

Next, from this state, the stop plate 18 of the stop ring 14 in the loosened state is mounted on the expanded polystyrene 33.
It is fastened to the joint pipe 1 in a state of being brought into contact with the end face side thereof. The rear end surface of the Styrofoam 33 is in contact with the flange portion 12b of the stop nut 12.

As a result, the collar portion 1 of the stop nut 12 is
Between 2b and the stop plate 18 of the stop ring 14, it is possible to secure an operation region in which the joint pipe 1 extends to the left in FIG. When the joint pipe 1 performs such an extension operation after the pipe joint is installed, the Styrofoam 33 is crushed with a torque of 10 to 30 in terms of bolt / nut tightening torque and becomes a thin plate shape. It does not hinder the extension operation.

Further, when the expansion and contraction flexible operation is not accompanied after the pipe joint is installed, the presence of the styrofoam 33 prevents dirt and stones from entering the expansion and contraction flexible space. The expansion and contraction flexible operation of the joint pipe 1 is not hindered by the dent.

It is possible to use an elastic body such as rubber for the Styrofoam 33. However, in the case of rubber, the repulsive elastic force increases rapidly as the compression proceeds, and the fastening force of the pipe joint is increased. Is likely to be canceled out, which is not preferable.

FIGS. 3 and 4 show a second embodiment according to the second means of the present invention. FIG. 3 is a partial vertical sectional view of a pipe joint, and FIG. 4 is a perspective view of a styrene foam 34. . In the second embodiment, the present invention is applied to the prior application technique shown in FIGS. 9 and 10. The Styrofoam 34 is mounted between the arm 28 of the connecting member 26 and the stop plate 25 of the stop ring 14. The function and effect of the Styrofoam 34 are the same as in the case of the first embodiment.

FIGS. 5 and 6 show a third embodiment according to the second means of the present invention. FIG. 5 is a partial longitudinal sectional view of a pipe joint, and FIG. 6 is a perspective view of a polystyrene foam 35. is there. In the third embodiment, in the second embodiment, styrofoam is arranged also between the push ring 7 and the stop plate 25 of the stop ring 14, and the arm 2 of the connecting member 26 is provided.
8 and the stop plate 25 are integrally formed with styrofoam.

In the third embodiment, the stop ring 35 can be automatically positioned by the polystyrene foam 35. The function and effect of the Styrofoam 35 are the same as in the case of the first embodiment.

[0035]

As described above, according to the present invention,
Since expanded polystyrene that does not hinder the expansion and contraction operation is interposed in the expansion and contraction flexible space of the connection pipe of the device for preventing the disconnection of the connection pipe, the expansion and contraction flexible space is secured by the expanded polystyrene. be able to.

Further, by interposing styrofoam in this way, even when buried in soil, soil, stones, etc. do not bite into the space for expansion and contraction, and a reliable expansion and contraction operation can be performed. It is possible to secure.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a pipe joint according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing styrofoam according to the first embodiment of the present invention.

FIG. 3 is a partial vertical cross-sectional view of a pipe joint according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing styrofoam according to a second embodiment of the present invention.

FIG. 5 is a partial vertical sectional view of a pipe joint according to a third embodiment of the present invention.

FIG. 6 is a perspective view showing styrofoam according to a third embodiment of the present invention.

FIG. 7 is an exploded perspective view showing an entire conventional pipe joint.

8 is a partial vertical cross-sectional view of the pipe joint shown in FIG.

FIG. 9 is an exploded perspective view showing the whole of another conventional pipe joint.

10 is a partial vertical cross-sectional view of the pipe joint shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Joining pipe 2 ... Joint body 4 ... Cavity 6 ... Rubber packing 7 ... Push ring 11 ... Tightening bolt 12 ... Stop nut 12b ... Stop nut collar 14 ... Stop ring 18 ... Stop plate 25 ... Stop plate 33 ... Styrofoam 34 ... Styrofoam 35 ... Styrofoam

Claims (2)

[Claims] 1. A pipe or a joint body having a tapered receiving portion, in which a screwless joint pipe is inserted, an annular rubber packing is inserted and inserted, and a pipe or bolt is used by a bolt and a nut which are tightening means of a push ring. In an expansion and contraction flexible pipe joint that is tightened to the joint body, a stop ring having a stop plate is externally fitted and attached to the back side of the push ring of the joint pipe,
A stop nut having a collar portion is screwed onto the tightening bolt of the push wheel to secure a space for expansion and contraction between the collar portion of the stop nut and the push ring, and the stop plate is provided in the expansion and contraction space. And a styrofoam intervening between the stop plate and the collar of the stop nut. 2. A pipe or a joint body having a tapered receiving portion, in which a screwless joint pipe is inserted, an annular rubber packing is inserted and interposed, and a pipe or a bolt is used as a tightening means of a push ring. In an expansion and contraction flexible pipe joint that is tightened to the joint body, a stop ring having a stop plate is externally fitted and attached to the back side of the push ring of the joint pipe,
It has a U-shape in a plan view, and a central arm fastens a connecting member located on the back side of the stop plate to a push ring, and a space for expansion and contraction is provided between the arm of the connecting member and the push ring. A device for preventing expansion and contraction of flexible pipe joints, characterized in that styrofoam is interposed between the stop plate and the arm of the connecting member.