JP6979155B2 - Stop plug - Google Patents

Description

The present invention relates to a stop plug. In particular, the present invention relates to a water stop plug used for a water stop device that temporarily shuts off the inside of a water pipe during repair or replacement work involving cutting of the water pipe.

Conventionally, a stop used to temporarily shut off the water inside the water pipe when repairing or replacing the middle part of the water pipe or when connecting a new branch pipe to the middle part. A flow plug is known (for example, Patent Document 1). Such a stop plug is, for example, as shown in the enlarged cross-sectional view of a main part of FIG. And an exterior bag 103 that encloses the interior bag 102 for protection, and the mouth of each bag and the base 101 are integrated by externally fitting and crimping the mouthpiece 101 with caulking 104 via the mouth of the exterior bag 103. It is configured by connecting them together.

This stop plug is, for example, as shown in the usage diagram of FIG. 7, from the inside of the stop device B attached to the water pipe A, through the stop plug insertion hole C formed in the water pipe A, to the water pipe A. A water stop plug 100 in a contracted state is arranged in the water stop plug 100, and air or water is supplied into the water stop plug 100 from a fluid supply / discharge pipe D connected to the base 101 of the water stop plug 100 to expand the water stop plug 100. Let it be used. Due to the expansion of the stop plug 100, the water in the water pipe A is shut off, and it becomes possible to carry out work such as repairing or replacing an intermediate portion of the water pipe A.

Japanese Unexamined Patent Publication No. 2001-241590

However, in the conventional stop plug, the binding force due to caulking is weak, so as the stop plug expands, a part of the mouth of the outer layer bag is pulled out from the caulking, and the position of the outer bag shifts. There was a problem that it occurred. Further, as shown in FIG. 8, the caulking ring 104 crimping the mouth of the outer layer bag is deformed so as to expand the diameter, so that the position of the outer layer bag 103 is displaced and a part or all of the mouth of the outer layer bag is removed. Has a problem of getting out of the caulking 104. When such a situation occurs, the flow stop performance of the stop plug deteriorates, and the expansion regulation and protection function of the interior bag by the outer layer bag cannot be exhibited.

Further, in order to increase the binding force by caulking, as shown in the enlarged cross-sectional view of the main part of FIG. 9, a long base 101 is used, and a plurality of caulking rings 104 are arranged along the axial direction thereof to form an exterior bag. A stop plug 100 having a structure for fixing the mouth of 103 to the base 104 is also known, but in the case of the stop plug 100 having such a structure, the length of the base becomes long, so that the water pipe is used. When the stop plug 100 is inserted into the inside of the water pipe A by turning the direction of the stop plug 100 by approximately 90 ° through the stop plug insertion hole B drilled in A, the long mouthpiece 101 is inserted into the stop plug insertion hole C. There was a problem that it could not be inserted smoothly because it interfered with the exit part. In particular, when the stop plug 100 is to be inserted into a water pipe having a relatively small inner diameter, the insertion itself may not be possible. Even in the case of a structure in which a plurality of caulking rings 104 are arranged along the longitudinal direction of the long base 101 and the mouth of the outer bag 103 is fixed to the base 101, the individual caulking 104 is bound. Since the force is not improved, the caulking ring (caulking ring arranged on the rightmost side in FIG. 9) particularly arranged on the tip end side of the stoppage back expands as the stoppage plug 100 expands. The diameter is easily deformed, and the outer layer bag 103 may be misaligned as it is used for a long period of time.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a stop plug that exhibits high stop performance without causing a positional shift of the outer layer bag.

The above object of the present invention is an inflatable interior bag having a rigid tubular base protruding at one end so as to be able to connect to a fluid supply / discharge pipe for supplying / discharging fluid, and expansion regulation and protection of the interior bag. A stop plug provided with an exterior bag that encloses the interior bag for use, the first caulking ring that externally crimps the mouthpiece via the mouth of the exterior bag, and the first caulking ring that is externally fitted. Achieved by a flow stop plug comprising a second caulking to crimp.

In this way, by configuring the outer bag mouth to be fixed to the base by the double caulking structure, the mouth of the outer layer bag is pulled out from the crimped portion as the inner bag and the outer layer bag of the stop plug expand. Even if a strong force is applied to increase the diameter of the first caulking, or even if a strong force is generated to expand the diameter of the first caulking, the binding force of the second caulking causes the mouth of the outer bag to move or the first caulking. It is possible to prevent the diameter of the ring from expanding, it is possible to extremely effectively suppress the occurrence of misalignment of the outer bag, and it is possible to exhibit high flow stop performance.

Further, in the stop plug, the second caulking is arranged by being folded back toward the first caulking side and the tip of the mouth of the outer bag which is folded back and arranged on the first caulking side. It is preferable that the first caulking ring is externally crimped via at least one of the tips of the mouth of the interior bag. By adopting such a configuration, the second caulking can narrow down the first caulking including the tip of the mouth of the outer bag and / or the tip of the mouth of the interior bag. While preventing the diameter of the caulking from expanding, the movement (positional deviation) of the tip of the mouth of the outer bag or the like can be suppressed more effectively, and high flow-stopping performance can be exhibited.

Further, the mouth tip portion of the exterior bag that is folded back and arranged on the first caulking side and / or the mouth tip portion of the interior bag that is folded back and arranged on the first caulking side is said. It is preferable that the first caulking is folded so as to cover the entire area. By adopting such a configuration, the second caulking can effectively suppress the movement (positional deviation) of the tip of the mouth of the outer bag or the like.

The thickness of the outer layer bag is preferably 0.1 mm to 0.7 mm. By setting the thickness dimension of the outer bag within the above numerical range, it becomes possible to stably perform double caulking of the outer bag mouth by the first caulking and the second caulking while maintaining the strength of the outer bag. , It is possible to effectively suppress the positional deviation of the outer bag due to the expansion of the stop plug.

Further, it is preferable that the outer layer bag is made of a high-strength polyethylene fiber and is made of a cloth material having a strength of 1.5 kN / 3 cm to 8 kN / 3 cm. By constructing the outer layer bag using such a cloth material, it becomes easy to configure the thickness of the outer bag as a relatively thin one, for example, 0.1 mm to 0.7 mm, and a high tensile strength is maintained. However, it is possible to obtain a flexible exterior bag.

Further, the outer layer bag is formed by sewing a cloth material into a bag shape, and a step dropped toward the lower cloth material at the edge of the sewn portion where the cloth materials are overlapped with each other. A portion is formed, and it is preferable that the step portion is provided with a step mitigation portion having an inclined surface that inclines toward the lower cloth material. By providing such a step mitigation portion, it is possible to effectively prevent deterioration of the flow stop property due to the presence of the step portion.

According to the present invention, it is possible to provide a flow stop plug that exhibits high flow stop performance without causing a positional shift of the outer layer bag.

It is a schematic structural plan view of the stop plug which concerns on this invention. FIG. 3 is an enlarged cross-sectional view of a main part of the flow stop plug shown in FIG. It is explanatory drawing for demonstrating the step portion which may be formed on the surface of an outer bag. It is a perspective view for demonstrating the modification of the stop current plug shown in FIG. It is explanatory drawing for demonstrating the modification of the stop current plug shown in FIG. It is an enlarged sectional view of the main part which concerns on the conventional stop plug. It is a usage state diagram of a stop plug. It is explanatory drawing for demonstrating the problem which a conventional stop plug has. It is an enlarged sectional view of the main part which concerns on the stop current plug which has another conventional form.

Hereinafter, the stop plug according to the present invention will be described with reference to the accompanying drawings. Each figure is partially enlarged or reduced to facilitate understanding of the configuration. FIG. 1 is a schematic configuration plan view showing an expanded state of the flow stop plug 1 according to the present invention, and FIG. 2 is an enlarged cross-sectional view of a main part thereof. This stop plug 1 is used to temporarily shut off the water inside the water pipe when repairing or replacing the middle part of the water pipe or when connecting a new branch pipe to the middle part. It is used, and as described in the background art, it contracts to the water pipe A from the inside of the water stop device B attached to the water pipe A through the stop plug insertion hole C drilled in the water pipe A. A stop plug 1 is arranged, and a gas or liquid such as air or water or a mixture thereof is supplied into the stop plug 1 from a fluid supply / discharge pipe D connected to the base 21 of the stop plug 1 to stop the flow. It is used by inflating the plug 1. In this embodiment, the case where the tap water in the tap water is stopped (stopped) will be described as an example, but the fluid in the pipe for stopping the flow is not limited to tap water, for example, gas. It may be a gas or liquid such as industrial water or sewage, or a mixture thereof.

As shown in FIGS. 1 and 2, the flow stop plug 1 according to the present invention includes an interior bag 2 and an exterior bag 3. The interior bag 2 has a retractable configuration in which a tubular base 21 having rigidity that can be connected to a fluid supply / discharge pipe D for supplying / discharging fluid is projected at one end, and the exterior bag 3 is also provided. Is arranged so as to enclose the interior bag 2 for expansion regulation and protection of the interior bag 2.

The interior bag 2 is made of rubber having airtightness and flexibility, and is formed into a long sphere having a long axis and a short axis of a predetermined length. The interior bag 2 may be made of an elastomer such as polyurethane, a cloth material, or a rubberized cloth. As described above, the base 21 is a cylindrical member having rigidity that can be connected to the fluid supply / discharge pipe D that supplies / discharges the fluid, and closes the opening provided at one end of the long shaft of the interior bag 2. As described above, it is provided with a base body 21a that is adhesively integrated with the interior bag 2, a first diameter-expanded portion 21b having a diameter larger than that of the base body 21a, and a second diameter-expanding portion 21c. The first diameter-expanded portion 21b is arranged on one end side of the base body 21a and is exposed to the outside, and the second diameter-expanded portion 21c is arranged on the other end side of the base body 21a and is inside the interior bag 2. Is placed in. The first diameter-expanded portion 21b and the second diameter-expanded portion 21c have a function of preventing the caulking from coming off. The base 21 is formed with a through hole 21d that penetrates in the axial direction at the central portion. The through hole 21d opens toward the inside of the interior bag 2, and a female screw is formed on the inner peripheral surface thereof on the side of the first enlarged diameter portion 21b. By screwing the tip of the fluid supply / discharge pipe D that supplies / discharges the fluid to this female screw, the fluid supply / discharge pipe D and the base 21 (stop plug 1) are connected to each other through the through hole 21d. The interior bag 2 expands due to the action of the fluid (air, water, etc.) supplied from the fluid supply / discharge pipe D.

The exterior bag 3 has a function of restricting excessive expansion of the interior bag 2, maintaining its shape when inflated, and protecting the interior bag 2 from protrusions and the like that induce damage, rupture, and the like. The exterior bag 3 is housed so as to cover the interior bag 2, and the mouth of the exterior bag 3 corresponding to the base 21 of the interior bag 2 is tightly fixed by the first caulking ring 4 and the second caulking ring 5, which will be described later. ing.

The first caulking 4 is a state in which a predetermined length of the tip of the mouth of the outer bag 3 is pulled out to the side of the first enlarged diameter portion 21b of the mouthpiece 21, and the mouthpiece 21 (the mouthpiece main body 21a) is passed through the mouth of the outer bag 3. It is a member for externally fitting and crimping. The second caulking ring 5 is folded back after the tip of the mouth of the exterior bag 3 arranged on the first enlarged diameter portion 21b side of the base 21 is folded back toward the first caulking ring 4 with respect to the first caulking ring 4. It is a member for externally fitting and crimping the first caulking ring 4 via the tip of the mouth. The first caulking ring 4 and the second caulking ring 5 are formed of, for example, a metal such as lead, tin, aluminum, and copper in an annular shape, and are configured to be deformed by a crimping tool or the like. be.

Here, the folded-back dimension of the mouth tip portion of the exterior bag 3 which is folded back and arranged on the first caulking ring 4 side installed on the base 21 may be appropriately set. For example, the surface of the first caulking ring 4 may be set appropriately. The folded-back dimension may be set so as to cover a part of the first caulking ring 4, or the folded-back dimension may be set so as to cover the entire area of the first caulking ring 4. From the viewpoint of effectively fixing the exterior bag 3 to the base 21 by the first caulking ring 4 and the second caulking ring 5, it is possible to set the folded dimension so as to cover the entire area of the first caulking ring 4. preferable.

The outer bag 3 is preferably formed of a cloth material having high tensile strength, low water permeability, and flexibility, an elastomer, a rubberized cloth, or the like. Further, the thickness of the exterior bag 3 is preferably in the range of 0.1 mm to 0.7 mm, more preferably in the range of 0.15 mm to 0.55 mm, for example. When the exterior bag 3 is formed of a cloth material, the fiber material constituting the cloth material is not particularly limited, but is preferably made of high-strength polyethylene fiber. The strength of the cloth material formed from the high-strength polyethylene fiber is preferably in the range of 1.5 kN / 3 cm to 8 kN / 3 cm in both warp and weft, and is preferably 2.7 kN / 3 cm to 6.7 kN /. It is more preferable to use one having a range of 3 cm. The basis weight of the cloth material formed of the high-strength polyethylene fiber is preferably in the range of 80 g / sqm to 300 g / sqm, and preferably in the range of 90 g / sqm to 250 g / sqm. Is even more preferable. The basis weight means the weight per ^{1 m 2.} By constructing the exterior bag 3 using a cloth material formed of such high-strength polyethylene fibers, the thickness of the exterior bag 3 can be configured to be relatively thin, for example, 0.1 mm to 0.7 mm. It becomes easy, and it is possible to obtain the outer bag 3 having a high flexibility while maintaining the high tensile strength (strength) as described above.

Further, as a method for forming the outer bag 3, various methods such as a method of forming by weaving various fiber materials into a bag shape and a method of forming a sheet-like cloth material by sewing into a bag shape are adopted. However, for example, in the case of forming a sheet-shaped cloth material by sewing it into a bag shape, the cloth materials are overlapped with each other as shown in the schematic perspective view (partially shown in the cross section) of FIG. At the edge of the sewn portion H, a stepped portion 31 stepped down toward the lower cloth material 3a is formed. When the water stop plug 1 is expanded and used in the water pipe A, the step portion 31 may form a flow path through which water leaks between the inner wall of the water pipe and the surface of the exterior bag 3. In particular, when the longitudinal direction of the step portion 31 is arranged in the water pipe A along the extending direction of the water pipe A, there is a high possibility that the flow stopping property of the water blocking plug 1 will be deteriorated. It ends up. Therefore, as shown in the schematic perspective view of FIG. 4, a step relaxation portion 6 having an inclined surface that inclines toward the lower cloth material 3a is provided in the step portion 31 along the longitudinal direction thereof. It may be configured. The step relaxation portion 6 can be formed, for example, by applying and molding an epoxy-based or acrylic-based adhesive along the step portion 31. Further, as shown in the schematic perspective view of FIG. 5A, a long step-relieving portion 6 having an inclined surface is prepared in advance using an elastomer material such as rubber, and the step portion 31 is formed via an adhesive. It may be fixed along. Further, as shown in the schematic perspective view of FIG. 5B, a flat insertion portion 6a is connected to a long step relaxation portion 6 having an inclined surface made of an elastomer material. As shown in the cross-sectional view of FIG. 5 (c), at the stage before sewing, the insertion portion 6a is interposed between the upper and lower cloth materials to be sewn and fixed by an adhesive or the like, and the lower cloth material 3a, The step relaxation portion 6 may be arranged along the step portion 31 by integrally sewing the insertion portion 6a and the upper cloth material 3b.

Hereinafter, the operation and effect of the flow stop plug 1 according to the present invention will be described. First, the flow stop plug 1 of the present invention has a double caulking structure including a first caulking ring 4 for externally fitting and crimping the mouth of the outer bag 3 and a second caulking ring 5 for externally fitting and crimping the first caulking ring 4. Therefore, even if a force for pulling out the mouth of the outer bag 3 from the crimped portion acts as the stop plug 1 expands, the mouth of the outer bag 3 moves (displaces). It is possible to prevent it. Further, even if a strong force for expanding the diameter of the first caulking ring 4 is generated at the contact point between the first caulking ring 4 and the outer bag 3 due to the expansion of the stop plug 1, the second caulking ring 5 is used. Due to the action of the binding force, the diameter expansion can be prevented, the occurrence of the positional deviation of the outer bag 3 can be suppressed extremely effectively, and high flow-stopping performance is exhibited.

Further, in the flow stop plug 1 according to the present invention, the tip of the mouth of the outer bag 3 is fixed on the first caulking ring 4 by the second caulking ring 5 in a state of being folded back toward the first caulking ring 4. There is. Therefore, even if a force that causes the mouth of the outer bag 3 to come out of the crimped portion is exerted due to the expansion of the stop plug 1, the predetermined portion of the mouth tip that is folded back and comes into contact with the corner of the first caulking ring 4. The portion 32 exerts a strong resistance force, and the outer bag 3 can be effectively prevented from being displaced.

Further, when the outer bag 3 is formed of a relatively thin cloth material having a thickness in the range of 0.1 mm to 0.7 mm, the follow-up when the tip of the mouth of the outer bag 3 is folded back to the first caulking 4 side. It has excellent properties, and also has excellent followability to the reduced diameter deformation of the second caulking ring 5 during external crimping of the first caulking ring 4 via the tip of the mouth by the second caulking ring 5, resulting in double caulking. It will be possible to do it stably. As a result, it is possible to more effectively suppress the positional deviation of the outer bag 3 due to the expansion of the stop plug 1. Further, since the exterior bag 3 can be configured to be relatively thin, it is possible to obtain the exterior bag 3 exhibiting high flexibility, and as a result, the exterior bag 3 follows the expansion of the diameter of the interior bag 2 inflated in the water pipe A. It becomes easy to do so, it becomes possible to effectively suppress the formation of a gap from which water leaks from the inner wall of the water pipe, and it is possible to exhibit high water stopping property.

Further, the flow stop plug 1 according to the present invention has a structure in which the mouth of the outer bag 3 is fixed to the base 21 by a plurality of caulking, but it is long as shown in FIG. 9 described in the background art. Since the structure is such that a plurality of caulking rings are arranged along the axial direction of the base 21 but has a double caulking structure, it is possible to prevent the base 21 from becoming long. As a result, when the stop plug 1 is inserted by turning the stop plug 1 into the inside of the water pipe A by turning the direction by approximately 90 ° through the stop plug insertion hole C formed in the water pipe A, the mouthpiece 21 is inserted into the stop plug insertion hole. It is possible to effectively prevent interference with the exit portion of C.

Although the stop plug 1 according to the embodiment of the present invention has been described above, the specific configuration of the stop plug 1 is not limited to the above embodiment. For example, in the above embodiment, after the tip of the mouth of the exterior bag 3 arranged on the side of the first enlarged diameter portion 21b of the base 21 with respect to the first caulking 4 is folded back to the side of the first caulking 4, the second is performed. The caulking ring 5 is configured to externally crimp the first caulking ring 4 through the folded mouth tip portion, but the mouth tip portion of the outer bag 3 is folded back toward the first caulking ring 4. Instead, the second caulking ring 5 may be configured to directly crimp the surface of the first caulking ring 4 by external fitting. Even with such a configuration, even if a force for pulling out the mouth of the outer layer bag 3 from the crimped portion acts as the inner bag 2 and the outer layer bag 3 of the stop plug 1 expand, or the first one. Even if a strong force that expands the diameter of the caulking ring 4 is generated, the movement of the mouth of the outer bag 3 and the expansion of the diameter of the first caulking ring 4 are prevented by the action of the binding force by the second caulking ring 5. It is possible to suppress the occurrence of misalignment of the outer bag 3 extremely effectively, and it is possible to exhibit high flow-stopping performance.

Further, in the above embodiment, the second caulking ring 5 is configured to externally crimp the first caulking ring 4 via the tip of the mouth of the outer bag 3 folded back to the first caulking ring 4. However, it is not particularly limited to such a configuration. For example, after both the mouth tip of the exterior bag 3 and the mouth tip of the interior bag 2 are folded back toward the first caulking ring 4, the second caulking ring 5 is the folded exterior bag 3 and the interior bag 2. The first caulking ring 4 may be configured to be externally crimped via the tips of both mouths. When such a configuration is adopted, it is preferable that the tip of the mouth of the exterior bag 3 and the tip of the mouth of the interior bag 2 cover the entire area of the first caulking 4 and are folded back so as to overlap each other.

Further, the tip of the mouth of the exterior bag 3 is not folded back to the first caulking ring 4, but only the tip of the mouth of the interior bag 2 is folded back to the first caulking 4 side, and the tip of the mouth of the interior bag 2 is passed through. The second caulking ring 5 may be configured to externally crimp the first caulking ring 4. In such a configuration, since the tip of the mouth of the interior bag 2 is firmly sandwiched by the first caulking ring 4 and the second caulking ring 5, it is possible to prevent the interior bag 4 from being displaced. It is possible to prevent the exterior bag 3 from being displaced due to the displacement of the interior bag 4. When adopting such a configuration, it is preferable that the tip of the mouth of the interior bag 2 is folded back so as to cover the entire area of the first caulking ring 4.

1 Stop plug 2 Interior bag 21 Base 3 Exterior bag 4 1st caulking ring 5 2nd caulking ring 6 Step mitigation part

Claims (5)

A retractable interior bag with a rigid tubular mouthpiece protruding at one end that can be connected to a fluid supply / discharge pipe that supplies and discharges fluid, and the interior bag is covered for expansion regulation and protection of the interior bag. A stop plug with an exterior bag to wrap,
The first caulking ring that externally crimps the base through the mouth of the outer bag, and
A second caulking ring for externally crimping the first caulking ring is provided.
The second caulking is the tip of the mouth of the exterior bag that is folded back and arranged on the first caulking side, and the tip of the mouth of the interior bag that is folded back and arranged on the first caulking side. A flow stop plug that externally crimps the first caulking ring via at least one of the above. The tip of the mouth of the exterior bag that is folded back and arranged on the first caulking side and / or the tip of the mouth of the interior bag that is folded and arranged on the first caulking side is the first. The stop plug according to claim 1 , which is folded back so as to cover the entire area of the caulking. The stop plug according to claim 1 or 2 , wherein the outer bag has a thickness of 0.1 mm to 0.7 mm. The stop plug according to any one of claims 1 to 3 , wherein the outer bag is made of a high-strength polyethylene fiber and is made of a cloth material having a strength of 1.5 kN / 3 cm to 8 kN / 3 cm. The exterior bag is formed by sewing a cloth material into a bag shape, and at the edge of the sewn portion where the cloth materials are overlapped with each other, there is a stepped portion that is stepped down toward the cloth material on the lower side. Is formed and
The stop plug according to any one of claims 1 to 4 , wherein the step portion is provided with a step mitigation portion having an inclined surface that inclines toward the cloth material on the lower side.

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