JPH08247359A - Pipe release preventing device for pipe joint - Google Patents

Abstract

PURPOSE: To provide a pipe release preventing device capable of being applicable to large diameter pipes, and being easily assembled. CONSTITUTION: A pipe release preventing device consists of a retaining ring 16 to be fasened to the outside peripheral surface of one pipe and a two-parts divided, engagingly locking metal fitting 17 to be fastened to the outside peripheral surface of the other pipe. With the retaining ring 16, fastening flanges 13 are formed facing each other with bolts, etc., at both end parts of the pipe- circumference halfway notched, and pipe release preventing projections 18 are arranged at any positions on the circumference of the pipe at specified intervals. With the engagingly locking metal fitting, facing flanges are provided opposite to each other with bolts, etc., on both end sides of each divided piece, and a half-split box part for surrounding the pipe release preventing projection in loosely fitting condition is formed on each of the flanges facing each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe detachment prevention device in a joint portion in which a pipe for underground embedding and a pipe are flexible and extendably connected.

[0002]

2. Description of the Related Art As a conventional joint in which a pipe for underground burying and a pipe are connected in a flexible and expandable manner, for example, the present applicant previously mentioned in Japanese Patent Application No. 5-224039. There is a technique shown in FIGS. 4 to 7 applied. This conventional technique is shown in FIG.
As shown in FIG. 3, an annular rubber packing 2 is attached on the outer peripheral surface of the water pipe 1 and its pipe end is fitted into the water pipe 3 so that the space between the water pipes 1 and 3 is Retains its watertightness.

In this case, the outer diameter of the water pipe 1 is set to be smaller than the inner diameter of the receiving portion of the water pipe 2, and the outer peripheral surface of the water pipe 1 and the water pipe 3 are received in the fitted state. A predetermined gap 4 is formed between the inner peripheral surface of the mouth. The gap 4 is designed to allow the joint portion of the water pipes 1 and 2 to be displaced in the radial direction and to bend within a predetermined range when the soil is moved due to running of an automobile or an earthquake. It is for absorbing and preventing damage to each pipe end of the joint portion.

In addition to the above-mentioned flexibility, the water pipe 1 must not be separated from the water pipe 3 in such a pipe joint portion, and a preventive device therefor is provided. is necessary. The tube detachment prevention device that the applicant previously applied is
It is composed of a retaining ring 5 which is fastened on the outer peripheral surface of one water pipe 1, and a two-piece locking metal fitting 6 which is fastened on the outer peripheral surface of the other water pipe 3.

A snap ring 5 tightened on the outer peripheral surface of the water pipe 1.
Has a so-called C-shape in which the middle of the circumference is cut out, and a pair of flanges 7, 7 facing each other are formed at both ends thereof. The flanges 7, 7 have bolt holes (not shown), and are fastened by bolts 8 and nuts 9.

Further, on the outer peripheral surface of the retaining ring 5, the center of a pair of retaining projections 10, 10 arranged at a predetermined interval is located at a position about 90 degrees away from the center of the flanges 7, 7. It is provided to do so. The distance between the retaining projections 10 and 10 is to compensate for the flexibility between the water pipe 1 and the water pipe 3.

On the other hand, the locking metal fitting 6 which is divided into two parts, which is tightened on the outer peripheral surface of the other water pipe 3, has the divided pieces 6a and 6b.
Flange 13, 13 for mounting the bolt 11 and the nut 12 is provided on both ends of the so as to face each other.

On each of the flanges 13 and 13, a projection 10 for preventing the retaining ring 5 from slipping off, which is tightened on the outer peripheral surface of the water pipe 1,
Connection arms 14, 14 inserted between 10 are integrally provided. Hooks 15, which are engaged with the retaining projections 10 to prevent the distance between the retaining ring 5 and the locking fitting 6 from exceeding a predetermined dimension, are provided on the tip ends of the connecting arms 14, 14. 15 is formed.

Thus, in such a pipe detachment preventing device, when a bend occurs between the water pipe 1 and the water pipe 3, FIG.
The angle formed between the water pipe 1 and the water pipe 3 is not displaced with the annular rubber packing 2 shown in Fig. 3 as a fulcrum, and the pipe end outer peripheral surfaces of the water pipe 1 and the water pipe 3 are not damaged. This bending is performed within a range in which the connecting arms 14, 14 of the locking fitting 6 can freely move within the space area formed by the retaining projections 10 and 10 of the retaining ring 5.

When this bending occurs, either one of the connecting arms 14 and 14 has the retaining projection 1.
0, 10 is engaged with one of the connecting arms 14, 1
The other one of the four receives its reaction force, so that the distance between these connecting arms 14, 14 never opens. Therefore, the upper and lower split pieces 6a and 6b of the locking metal fitting 6 are
There is no chance that the joint surface of will break open. Moreover,
The upper and lower split pieces 6a and 6b of the locking fitting 6 are rigidly fixed, which also works to prevent the split pieces 6a and 6b from being twisted. Therefore, the water pipe 3 is not damaged by the edges of the divided pieces 6a and 6b.

When a force is exerted on the water pipe 1 with respect to the water pipe 3 in the leftward direction in FIGS. 4 to 7, the hooks 15 and 15 of the connecting arms 14 and 14 of the water pipe 1 are the snap rings 5 respectively. It is possible to freely come out until it comes into contact with the retaining projections 10, 10. By the way, the hooks 15 and 15
After the contact with the retaining projections 10 and 10, the gap between the retaining ring 5 and the locking fitting 6 is suppressed by the connecting arms 14 and 14, and further withdrawal is stopped.

As described above, when a force is applied to the water pipe 1 in the direction of withdrawal, the retaining ring 5 is not divided into two parts but is a single member, and the retaining ring 5 is distorted. There is no such thing. Further, although the locking metal fitting 6 is a metal fitting divided into two, in the present embodiment, the connecting arm 1
After the hooks 15 and 15 of 4 and 14 have come into contact with the retaining projections 10 and 10, the pulling-out force is applied to these connecting arms 1.
It acts in the direction of joining 4,14. Therefore, the connecting arms 14 and 14 never open to each other, and as a result, the split pieces 6a and 6b of the locking metal member 6 twist and open,
There is no distortion.

In addition, the locking metal fitting 6 is rigidly fixed to the large diameter portion 8 of the water pipe 3, and the movement of the water pipe 3 in the direction of withdrawal is restricted by the annular bulging portion 16. Therefore, the divided pieces 6a and 6b are not pulled individually to cause distortion.

[0014]

However, in the prior art previously filed by the applicant of the present invention, a worker in the field puts the snap ring 5 on the outer peripheral surface of the water pipe 1 in the wrong order of assembling. When the water pipe 1 is fitted to the outside and the water pipe 1 is inserted into the water pipe 3, the retaining ring 5 and the locking fitting 6 cannot be engaged with each other.
Therefore, it is necessary to disassemble the entire assembly and reassemble it, and the insertion work of the water pipe 1 must be performed last.

Further, in the assembling work, as shown by the chain line in FIG. 6, the retaining ring 5 is slanted with respect to the locking metal fitting 6 fixed to the outer peripheral surface of the water pipe 3. Therefore, it is essential to insert the hooks 15, 15 between the retaining projections 10, 10. Moreover, in order to install the retaining ring 5 smoothly, the dimension L of the connecting arms 14 and 14 needs to have a certain length, and the hooks 15 and 15 and the retaining projection 1 are provided.
The projecting dimension W ₁ from the outer peripheral surface of the water pipe up to the part where 0 and 10 are engaged also needs a certain length. Therefore, when the water pipes 1 and 3 are large-diameter pipes, due to the dimensions L and W ₁ , a large bending moment acts on the retaining projections 10 and 10 during the detaching operation, and the bending moment prevents the retaining pipes from retaining. The projections 10 and 10 are deformed to the locking side, and there is a possibility that the engagement with the hooks 15 and 15 may be released. That is, there is a drawback that it cannot be applied to large diameter pipes.

Further, the locking metal fitting 6 and the retaining ring 5 are shipped as a set in a temporarily assembled state so as to prevent the individual parts from being separated during transportation. If it becomes slanted, it will easily deviate from the locking metal fitting 6, so there is a problem that it cannot be shipped unless the whole is packed.

[0017]

SUMMARY OF THE INVENTION The present invention has been made by improving and removing the above-mentioned problems in view of the conventional problems described above, and a pipe separation preventing device which can be used even for a large diameter pipe and which is easy to assemble is provided. It is intended to be provided.

Thus, the means adopted by the present invention to solve the above-mentioned problems is that the outer peripheral surface of one of the pipes is a joint portion in which the pipes are flexible and extendably and contractably connected. It consists of a snap ring that is tightened up and a split metal fitting that is tightened on the outer peripheral surface of the other pipe.The snap ring is fastened with bolts or the like to both ends that are cut out in the middle of the circumference. Flanges are formed facing each other, and have retaining projections that are arranged at predetermined positions on the circumference at predetermined intervals. The fastening flanges are provided so as to face each other, and each facing flange is formed with a box portion in a half-divided state for surrounding the retaining projection of the retaining ring in a loose state. It is a pipe separation prevention device for a pipe joint.

[0019]

In the pipe detachment prevention device of the present invention, the retaining ring has a single C-shape as a whole, and the retaining protrusion is formed at a position on the outer peripheral surface of the retaining ring. The space for inserting is larger than the outside diameter of the water pipe. Moreover, the locking metal fittings are provided with flanges for fastening with bolts or the like facing each other on both ends of each of the upper and lower divided pieces, and a box in a half-divided state is formed on each facing flange. Has been done. The boxes in the half-divided state form a pair of upper and lower parts, which surround the retaining projection of the retaining ring.

Therefore, the water pipes can be flexed and expanded and contracted within a range in which the retaining projections can fit in the box. Assembling work is done by first fitting the retaining ring onto one water pipe and inserting the tip side into the other water pipe,
It is possible to attach locking metal fittings. On the contrary, it is also possible to attach the locking metal fitting to the water pipe and insert the other water pipe while fastening the retaining ring to the locking metal fitting to fasten the retaining ring.

[0021]

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 to 3 relate to an embodiment of the present invention, FIG. 1 is a side view of a pipe joint portion in which a pipe separation prevention device is mounted, and FIG. 2 is a plan view of the pipe joint portion. FIG. 4 is a front view of the pipe joint portion.

The pipe separation prevention device of the present invention is basically the same as that shown in FIGS. 4 to 7 previously filed by the present applicant, and is tightened on the outer peripheral surface of one water pipe 1. Retaining ring 16
And a locking metal fitting 17 that is divided into two and is tightened on the outer peripheral surface of the other water pipe 3.

A retaining ring 5 tightened on the outer peripheral surface of the water pipe 1.
Has a so-called C-shape in which the middle of the circumference is cut out, and a pair of flanges 7, 7 facing each other are formed at both ends thereof. The flanges 7, 7 have bolt holes (not shown), and are fastened by bolts 8 and nuts 9. Further, on the outer peripheral surface of the retaining ring 16, one retaining protrusion 18 is formed at a position separated from the center of the flanges 7, 7 in the left-right direction by about 90 degrees.

On the other hand, the two locking metal fittings 17 which are tightened on the outer peripheral surface of the other water pipe 3 are provided with bolts 11 and nuts 12 at both ends of the respective divided pieces 17a and 17b.
Flanges 13 and 13 for mounting are provided so as to face each other.

A water pipe 1 is provided on each of the flanges 13 and 13.
Boxes 19 and 19 in a half shape for surrounding the retaining projections 18 of the retaining ring 16 tightened on the outer peripheral surface of the
Are provided integrally. That is, as shown in FIG. 1, a pair of upper and lower halved boxes 19, 1 facing each other.
The space 20 formed by 9 is set to be sufficiently larger than the retaining projection 18 of the retaining ring 16 mounted therein. Therefore, the retaining projection 18 is provided in the space 20.
The water pipe 1 and the water pipe 3 can be flexed and expanded / contracted within this range.

The operation in the case where the water pipe 1 and the water pipe 3 are bent is basically as shown in FIG.
~ The same as shown in Fig. 7. Thus, when the water pipe 1 is acted on by the force of moving the water pipe 3 toward the left side in FIGS. 1 and 2, the retaining projection 16 of the retaining ring 16 causes the box 1 to move.
After the contact with the inner wall surfaces of 9 and 19, the movement of the water pipe 1 is restricted, and the water pipe 1 is prevented from coming off.

At this time, a pair of upper and lower boxes 19, 19
When the retaining projections 18 of the retaining ring 16 come into contact with each other, they receive stress in the departure direction. However, box 19,
Since the bonding surface of the entire surface of 19 is in surface contact, the stresses caused by the retaining projections 18 act inwardly on each other, and the boxes 19 and 19 do not open. This is the same even when the water pipe 1 and the water pipe 3 are flexible and are moved in the departure direction.

In short, the deviation force acting on the water pipe 1 is
The boxes 19 and 19 act in the direction of tightening. Moreover, as shown in the plan view of FIG.
The projecting dimension W ₂ of the portion of the water pipe 1 engaging with the retaining projection 18 from the outer peripheral surface of the water pipe 1 can be made much shorter than in the conventional case, and a large bending moment is generated in these portions. Since it does not occur, it can be applied to large diameter pipes.

Next, the retaining ring 16 constructed as described above,
The order of assembling the locking metal fittings 17 will be described. There are two types of assembly. In the first assembling procedure, first, on the ground, the annular rubber packing 2 is fitted inside the inner peripheral surface of the receiving portion of the water pipe 3. Next, the bolt 11 of the locking metal fitting 17
Then, the nut 12 is loosened, the interval between the upper and lower divided pieces 17a and 17b is widened, and the water pipe 3 is externally fitted and mounted. After that, the retaining projections 18, 18 of the retaining ring 16 are loaded into the space 20 formed by the boxes 19, 19.
In this state, the bolt 11 and the nut 12 of the locking metal fitting 17 are tightened to fix the locking metal fitting 17 to the water pipe 3, and the retaining metal 16 is suspended and supported by the locking metal fitting 17.

In this supporting state, the retaining ring 16 is in a loosened state, the flanges 7, 7 are opened, and the whole is larger than the diameter of the water pipe 3 so that it fits with the center of the water pipe 3. It's gone. However, since the retaining projection 18 contacts the bottom of the box 19 and the retaining ring 16 is slightly lowered as a whole, the retaining ring 16 is supported by the engaging metal fitting 17, resulting in the center of the water pipe 3. The center of the retaining ring 16 comes to match. After that, all of these are arranged in a groove in the soil, only the water pipe 1 is inserted in the groove to adjust the position of the retaining ring 16, and the bolt 8 and the nut 9 are fastened. The entire assembly should be completed.

The second assembling procedure is to disassemble the locking metal fitting 17 on the ground and attach the retaining ring 16 to the water pipe 1.
It is loosely attached to the outer peripheral surface of the. Next, the respective water pipes 1 and 3 are arranged in a groove in the soil, and the water pipe 1 is inserted into the water pipe 3 in this groove. Subsequently, the divided pieces 17a and 17b of the locking metal fitting 17 are externally fitted and mounted on the outer peripheral surface of the water pipe 3, and the boxes 19 and 19 above and below the snap ring 16 are attached to the snap ring 16.
The stopper projection 18 of FIG. Finally, the bolts and nuts of the locking fitting 17 and the snap ring 16 may be fastened.

As described above, in any assembling procedure, the work in the groove in the soil is performed only by inserting the water pipe 1 and tightening the bolts and nuts of the retaining ring 16 or the locking metal fittings 17. Therefore, the entire assembling work can be performed extremely simply.

[0033]

As described above, according to the present invention,
A half-split box is formed on the opposing flanges of each of the upper and lower split pieces of the locking fitting, and the retaining ring projections of the retaining ring are surrounded in a loose state in the space formed by this box. By doing so, it is possible to add flexibility and stretchability between the tubes by the amount that the retaining projection can move within the box. Moreover, when the pipe moves in the departure direction, the stress of the retaining projection acts in the direction of closing the upper and lower boxes. As a result, it is possible to withstand a large stress and can be applied to a large-diameter pipe.

Further, in these assembling, it is possible to first fit the retaining ring onto one of the pipes and insert the tip end side into the other pipe, and then attach the locking metal fittings, and vice versa. It is also possible to attach the locking metal fitting to one of the pipes, insert the other pipe in the state that the retaining ring is locked to this locking metal fitting, and fasten the retaining ring, there is no restriction on the assembly order. It is possible to freely assemble. Furthermore, most of these operations are performed on the ground, and in a narrow groove in the soil, only the work of inserting the water pipe and the additional tightening of the bolts and nuts are performed, and the troublesome work can be performed on the ground. Since the work can be simplified, the whole assembling work is significantly simplified.

Furthermore, in the temporarily assembled state, the retaining metal fitting and the retaining ring will not come off the retaining ring projection from the retaining metal fitting box unless the bolts and nuts of the retaining metal joint are loosened. . Therefore, the locking metal fitting and the snap ring are never separated during the transportation, and it is not necessary to ship the both in a packaged state.

[Brief description of drawings]

FIG. 1 is a side view of a pipe joint portion showing a pipe separation preventing device according to the present invention.

FIG. 2 is a plan view of a pipe joint portion showing a pipe separation prevention device according to the present invention.

FIG. 3 is a front view of a pipe joint portion showing a pipe separation prevention device according to the present invention.

FIG. 4 is a semi-longitudinal sectional view of a pipe joint portion showing a conventional pipe detachment prevention device.

FIG. 5 is a perspective view of a pipe joint portion showing a conventional pipe separation preventing device.

FIG. 6 is a plan view of a pipe joint portion showing a conventional pipe separation prevention device.

FIG. 7 is a side view of a pipe joint portion showing a conventional pipe separation prevention device.

[Explanation of symbols]

1 ... Water pipe 2 ... Rubber packing 3 ... Water pipe 4 ... Space 13 ... Flange of locking metal fitting 16 ... Snap ring 17 ... Locking metal fitting 17a ... Splitting piece of locking metal fitting 17b ... Splitting piece of locking metal fitting 18 ... Detachment Projection

Claims (1)

[Claims] Claims: 1. In a joint portion in which pipes are flexible and extendably and contractibly connected, a retaining ring tightened on an outer peripheral surface of one pipe and an outer peripheral surface of the other pipe are provided. The retaining ring is composed of two locking metal fittings that are tightened. The locking metal fittings have retaining projections arranged at predetermined intervals, and the locking metal fittings are provided with flanges for fastening with bolts or the like facing each other on both ends of each split piece, and the flanges facing each other. A pipe disengagement prevention device for a pipe joint, wherein a box portion in a half-divided state for surrounding the retaining projection of the retaining ring in a loose state is formed.