JP2736759B2 - Pipe detachment prevention device for fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a pipe from being detached at a joint where a pipe for underground burial is connected to the pipe with flexibility and expansion and contraction.

[0002]

2. Description of the Related Art As a conventional joint in which a pipe for underground burial and a pipe are connected to each other with flexibility and expansion and contraction, for example, the applicant of the present invention disclosed in Japanese Patent Application No. Hei. There is a technique shown in FIGS. This prior art is shown in FIG.
As shown in the figure, an annular rubber packing 2 is mounted on the outer peripheral surface of the water pipe 1 on the insertion side, and the pipe end is fitted into the socket of the water pipe 3 so that the space between the water pipes 1 and 3 is formed. The watertightness is maintained.

[0003] In this case, the outer diameter of the water pipe 1 is set smaller than the inner diameter of the receiving portion of the water pipe 2. A predetermined gap 4 is formed between the inner peripheral surface of the mouth and the inner peripheral surface. The gap 4 is used to allow the joints of the water pipes 1 and 2 to be displaced in the radial direction and to bend within a predetermined range when the soil moves due to running of an automobile, an earthquake, or the like. This is for absorbing and preventing damage to each pipe end of the joint portion.

In such a pipe joint, in addition to having the above-mentioned flexibility, the water pipe 1 must not be detached from the water pipe 3, and a preventive device therefor is required. is necessary. The pipe detachment prevention device filed earlier by the present applicant is:
It comprises a retaining ring 5 tightened on the outer peripheral surface of one water pipe 1 and a two-part locking metal fitting 6 tightened on the outer peripheral surface of the other water pipe 3.

[0005] Retaining ring 5 tightened on the outer peripheral surface of water pipe 1
Has a so-called C-shape in which a part of the circumference is cut out, and a pair of flanges 7, 7 facing each other are formed at both ends. The flanges 7 have bolt holes (not shown), and are fastened by bolts 8 and nuts 9.

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 spacing between the retaining projections 10, 10 is for compensating the flexibility between the water pipe 1 and the water pipe 3.

On the other hand, the locking metal fitting 6 divided into two parts tightened on the outer peripheral surface of the other water pipe 3 has respective divided pieces 6a and 6b.
, Flanges 13 for attaching a bolt 11 and a nut 12 are provided to face each other.

On each of the flanges 13, 13, a retaining projection 10, which is secured on the outer peripheral surface of the water pipe 1, of the retaining ring 5.
Connection arms 14, 14 inserted between 10 are provided integrally. Hooks 15 are provided on the distal ends of the connecting arms 14, 14 so as to lock the retaining ring 5 and the locking metal member 6 with the retaining projections 10, 10 so that the distance between the retaining ring 5 and the locking metal member 6 does not exceed a predetermined dimension. 15 are formed.

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

In the case where this bending occurs, one of the connecting arms 14, 14 is attached to the retaining projection 1.
0, 10 and the connecting arm 14, 1
Since the other one of the 4 is subject to the reaction force, the distance between the connecting arms 14, 14 is never widened. Therefore, the upper and lower divided pieces 6a and 6b
The joint surface is not twisted and opened. Moreover,
The upper and lower divided pieces 6a and 6b of the latch 6 are rigidly fixed, and this also acts to prevent the divided 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 applied to the water pipe 1 to move the water pipe 3 to the left in FIGS. 4 to 7, the water pipe 1 is connected to the hooks 15 of the connecting arms 14, 14. Can come out freely until it comes into contact with the retaining projections 10, 10. By the way, hooks 15, 15
After the abutment with the retaining projections 10, 10, the distance between the retaining ring 5 and the locking fitting 6 is suppressed by the connecting arms 14, 14, and further escape is stopped.

As described above, when the force in the pull-out direction acts on the water pipe 1, the retaining ring 5 is not divided into two parts, but is a single member as a whole, and the retaining ring 5 is distorted. There is no such thing. In addition, although the locking fitting 6 is a fitting divided into two, in this embodiment, the connecting arm 1 is provided.
After the hooks 15, 15 of the hooks 4, 14 abut against the retaining protrusions 10, 10, the withdrawal force is applied to these connecting arms 1
It acts in the direction of joining the four and fourteen. Therefore, the connecting arms 14 and 14 never open to each other, and as a result, the divided pieces 6a and 6b of the latch 6 are torn open.
There is no distortion.

In addition, the locking 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 exit direction is restricted by the annular bulging portion 16. Therefore, there is no possibility that the divided pieces 6a and 6b are individually pulled to cause distortion.

[0014]

However, in the prior art filed earlier by the present applicant, a worker at the site mistakes the order of assembling and places the retaining ring 5 on the outer peripheral surface of the water pipe 1. When the water pipe 1 is inserted into the water pipe 3 with the outer fitting, the engagement between the retaining ring 5 and the locking fitting 6 becomes impossible.
Therefore, it was necessary to disassemble the entire assembly and perform the assembly again, and the insertion of the water pipe 1 had to be performed last.

In the assembling operation, as shown by a chain line in FIG. 6, a single piece of the retaining ring 5 is obliquely inclined with respect to the locking 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. In addition, in order to mount the retaining ring 5 smoothly, a certain length is required for the dimension L of the connecting arms 14, 14, and the hooks 15, 15 and the retaining projection 1 are required.
Projecting dimension W ₁ of the 0,10 from water pipe outer peripheral surface of the up-engaging portion were also requires a certain length. Therefore, when the water pipe 1 and 3 becomes larger diameter tube, for the dimensions L and W _1, a large bending moment during withdrawal operation is to act on the retaining projections 10, 10, for retaining this bending moment The projections 10 are deformed to the locking side, and the engagement with the hooks 15 may be disengaged. That is, there is a drawback that it cannot be applied to a large-diameter pipe.

Further, the locking fitting 6 and the retaining ring 5 are shipped as a single set in a tentatively assembled state so that the parts do not fall apart during transportation. If it is inclined, it will easily deviate from the locking fitting 6, so that it cannot be shipped unless the whole is packed.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems and has been improved and eliminated. A device for preventing detachment of a pipe which can be used even with a large-diameter pipe and which is easy to assemble is provided. It will not be provided.

Means adopted by the present invention to solve the above-mentioned problem is that an outer peripheral surface of one of the pipes is provided at a joint where the pipes are connected to each other with flexibility and elasticity. It consists of a retaining ring that is tightened on the upper side and a two-part locking metal fitting that is tightened on the outer peripheral surface of the other pipe. Flanges are formed opposite to each other, and have retaining projections arranged at predetermined positions at arbitrary positions on the circumference. The fastening flanges are provided to face each other, and each of the opposed flanges is formed with a half-split box portion for surrounding the retaining protrusion of the retaining ring in a loose state. A pipe separation preventing device for a pipe joint.

[0019]

In the pipe detachment prevention device according to the present invention, the retaining ring has a single C-shape as a whole, and a retaining projection is formed at a position on the outer peripheral surface thereof. Is larger than the outer diameter of the water pipe. Moreover, the locking metal fittings are provided with fastening flanges, such as bolts, at both ends of each of the upper and lower divided pieces, and each of the opposed flanges has a half-split box. Have been. The boxes in the half-split state are paired up and down to surround the retaining projection of the retaining ring.

Therefore, the water pipes can be flexible and expandable and contractable within a range in which the retaining projections can fit in the box. Assembling work, first, after externally attaching the retaining ring to one water pipe and inserting the distal end side into the other water pipe,
It is possible to attach a locking fitting. Conversely, it is also possible to attach the locking fitting to the water pipe, insert the other water pipe in a state where the retaining ring is locked to the locking fitting, and fasten the retaining ring.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as those in the conventional case denote the same members. 1 to 3 relate to one embodiment of the present invention. FIG. 1 is a side view of a pipe joint with a pipe detachment prevention device mounted thereon, FIG. 2 is a plan view of the pipe joint, and FIG. FIG. 2 is a front view of the pipe joint.

The pipe detachment 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 two-part locking metal fitting 17 which 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 a part of the circumference is cut out, and a pair of flanges 7, 7 facing each other are formed at both ends. The flanges 7 have bolt holes (not shown), and are fastened by bolts 8 and nuts 9. On the outer peripheral surface of the retaining ring 16, one retaining projection 18 is formed at a position approximately 90 degrees apart from the center of the flanges 7, 7 in the left-right direction.

On the other hand, a locking metal part 17 divided into two parts tightened on the outer peripheral surface of the other water pipe 3 has a bolt 11 and a nut 12 at both ends of each of the divided pieces 17a and 17b, respectively.
Are provided facing each other.

Each of the flanges 13 is provided with a water pipe 1.
Half-shaped boxes 19, 19 for surrounding the retaining projections 18 of the retaining ring 16 tightened on the outer peripheral surface of the ring in a loose state.
Are provided integrally. That is, as shown in FIG. 1, a pair of opposing upper and lower halved boxes 19, 1
The space 20 defined by 9 is set to be sufficiently larger than the retaining projection 18 of the retaining ring 16 mounted therein. For this reason, the retaining projection 18 is provided in the space 20.
The water pipe 1 and the water pipe 3 can be flexibly expanded and contracted within this range.

The operation when the bending occurs between the water pipe 1 and the water pipe 3 is basically the same as that shown in FIG.
7 are the same as those shown in FIG. Thus, when a force is applied to the water pipe 1 to move the water pipe 3 to the left in FIGS. 1 and 2, the retaining projection 18 of the retaining ring 16 is moved to the box 1.
After contact with the inner wall surfaces of the pipes 9 and 19, the movement of the water pipe 1 is restricted, and the water pipe 1 is prevented from falling 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, a stress in a departure direction is applied. However, box 19,
Since the entire surface of the joint 19 is in surface contact, the stresses caused by the retaining projections 18 act inward with each other, and the boxes 19, 19 do not open. This is the same even when the water pipe 1 and the water pipe 3 are moved in the deviating direction while being flexible.

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

Next, the retaining ring 16 configured as described above,
An assembling work sequence of the locking fitting 17 will be described. There are two types of assembly. The first assembling procedure is as follows. First, on the ground, the annular rubber packing 2 is fitted on the inner peripheral surface of the receiving portion of the water pipe 3. Next, the bolt 11 of the latch 17
And the nut 12 are loosened, and the space between the upper and lower divided pieces 17a and 17b is widened so as to be externally fitted to the large diameter portion of the water pipe 3. Then, the retaining projections 18, 18 of the retaining ring 16 are inserted into the space 20 formed by the boxes 19, 19,
In this state, the bolt 11 and the nut 12 of the locking member 17 are tightened to fix the locking member 17 to the water pipe 3, and the retaining ring 17 suspends and supports the retaining ring 16.

In this support state, the retaining ring 16 is in a loosened state, the space between the flanges 7 and 7 is opened, and the whole is larger than the diameter of the water pipe 3 so that the center of the water pipe 3 is fitted. Is gone. However, since the retaining projections 18 abut against the bottom of the box 19 and the entire retaining ring 16 is slightly lowered, the retaining ring 16 is supported by the engaging metal fittings 17. The center of the retaining ring 16 is matched. After that, these are all disposed in a groove in the soil, and only the water pipe 1 is inserted through the groove to adjust the position of the retaining ring 16, and the bolt 8 and the nut 9 are tightened. What is necessary is just to complete the whole assembly.

The second assembling procedure is as follows. On the ground, the locking bracket 17 is disassembled, and the retaining ring 16 is connected to the water pipe 1.
Is fitted to the outer peripheral surface of the cable in a loosened state. Next, each of the water pipes 1 and 3 is disposed in a groove in the soil, and the water pipe 1 is inserted into the water pipe 3 in this groove. Subsequently, each of the divided pieces 17a and 17b of the locking member 17 is externally fitted to the outer peripheral surface of the water pipe 3, and the upper and lower boxes 19 and 19 are attached to the snap ring 16.
Is covered with the retaining projection 18. Finally, the bolts and nuts of the locking metal 17 and the retaining ring 16 may be fastened.

As described above, in any of the assembling procedures, the work in the trench in the soil is performed only by inserting the water pipe 1 and retightening the bolts and nuts of the retaining ring 16 or the locking metal 17. Yes, the entire assembly work can be performed extremely simply.

[0033]

As described above, in the present invention,
A half-split box is formed on the opposing flange of each of the upper and lower divided pieces of the locking metal, and the retaining ring projection for surrounding the retaining ring in a free state is formed in the space defined by the box. By doing so, it is possible to impart flexibility and elasticity between the tubes by the amount by which 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 a direction to close the upper and lower boxes. As a result, it is possible to withstand a large stress, and it is also applicable to a large diameter pipe.

[0034] In addition, it is possible to attach a retaining ring to one of the pipes first, insert the distal end of the retaining ring into the other pipe, and then attach a locking fitting. It is also possible to attach the locking fitting to one of the pipes, insert the other pipe and fasten the retaining ring with the retaining ring locked to this locking fitting, and there is no restriction on the order of assembly. , Can be freely assembled. In addition, most of these operations are performed on the ground, and only the work of inserting water pipes and re-tightening bolts and nuts are performed in narrow ditches. Since the operation can be simplified, the entire assembling operation is significantly simplified.

Furthermore, in the tentatively assembled state, the locking projection and the retaining ring do not come off from the box of the retaining metal unless the bolts and nuts of the retaining metal are loosened. . Therefore, during the transportation, the locking metal and the retaining ring never separate, and it is not necessary to ship the two in a packed state.

[Brief description of the drawings]

FIG. 1 is a side view of a pipe joint showing a pipe detachment prevention device according to the present invention.

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

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

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

FIG. 5 is a perspective view of a pipe joint showing a conventional pipe detachment prevention device.

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

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water pipe 2 ... Rubber packing 3 ... Water pipe 4 ... Space 13 ... Flange of locking metal 16 ... Retaining ring 17 ... Locking metal 17a ... Split piece of locking metal 17b ... Split piece of locking metal 18 ... Stop Projection

Claims (1)

(57) [Claims] At a joint portion in which a pipe and a pipe are connected to each other with flexibility and expansion and contraction, a snap ring tightened on an outer peripheral surface of one of the pipes and a retaining ring on an outer peripheral face of the other of the pipes. The retaining ring is made up of two parts which are tightened, and the retaining ring is formed by opposing flanges for fastening with bolts or the like at both ends, which are notched in the middle of the circumference. Each of the locking metal fittings has a flange for fastening with a bolt or the like at both ends of each of the divided pieces, and a flange for fastening. Wherein a half-split box portion is formed to surround the retaining projection of the retaining ring in a loosely fitted state.