JP2019090490A - Flow stop plug - Google Patents

Abstract

To provide a flow stop plug exhibiting high flow stop performance without generating positional deviation of an outer layer bag.SOLUTION: A flow stop plug comprises: an expandable/contractable interior bag at one end of which a cylindrical mouthpiece is protrusively provided, wherein the mouthpiece can be connected to a fluid supply/discharge pipe for supplying/discharging fluid, and has rigidity; and an exterior bag covering the interior bag for expansion regulation and protection of the interior bag. The flow stop plug also comprises a first caulking ring externally fitting and crimping the mouthpiece via a mouth of the exterior bag, and a second caulking ring externally fitting and crimping the first caulking ring.SELECTED DRAWING: Figure 2

Description

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

  Conventionally, stop is used to temporarily shut off the water inside the water pipe during construction such as when repairing or replacing the middle part of the water pipe or when connecting a branch pipe newly to the middle part of the water pipe. A flow plug is known (for example, Patent Document 1). Such a stationary flow plug is, for example, as shown in the enlarged cross-sectional view of the main part in FIG. 6, an expandable interior bag 102 having a cylindrical base 101 projecting from one end, and expansion regulation of the interior bag 102. And the outer bag 103 for enclosing the inner bag 102 for protection, and the mouth ring of each bag and the mouth ring 101 are integrated by press-fitting the base 101 with the caulking ring 104 through the mouth of the outer bag 103. It is configured in a connected manner.

  This stationary flow plug is, for example, as shown in the use state diagram of FIG. 7, from the stationary flow device B attached to the water pipe A, through the stationary flow plug insertion hole C drilled in the water pipe A Is disposed in a contracted state, and air or water is supplied from the fluid supply and discharge pipe D connected to the mouthpiece 101 of the stationary flow plug 100 into the stationary flow plug 100 to expand the stationary flow plug 100. Let it be used. The expansion of the stationary flow plug 100 shuts off the water in the water pipe A, making it possible to carry out construction work such as repair and replacement of the middle portion of the water pipe A.

JP 2001-241590 A

  However, in the conventional stationary flow plug, since the tightening force by the caulking is weak, a part of the mouth of the outer layer bag is pulled out from the caulking ring along with the expansion of the stationary flow plug, and the positional displacement of the exterior bag There was a problem to occur. In addition, as shown in FIG. 8, deformation occurs such that the diameter of the crimping ring 104 that crimps the mouth of the outer layer bag is increased, and the positional deviation of the outer layer bag 103 or a part or all of the mouth of the outer layer bag However, there was a problem that it slipped out of the crimping 104. When such a situation occurs, the stationary flow performance of the stationary flow plug is degraded, and the outer layer bag does not exert the expansion regulation or protection function of the interior bag.

  Also, 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 There is also known a stationary flow plug 100 having a structure for fixing the mouth of the mouth 103 to the base 104, but in the case of the stationary flow plug 100 having such a structure, a water pipe may be used due to the length of the base becoming longer. When inserting the stationary flow plug 100 into the inside of the water pipe A through the stationary flow plug insertion hole B bored in A, turning the approximately 90 ° direction and inserting the stationary flow plug 100 into the stationary flow plug insertion hole C There is a problem that it interferes with the exit and can not be inserted smoothly. In particular, when trying to insert the still flow plug 100 into a water pipe with 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 disposed along the longitudinal direction of the long cap 101 and the mouth of the exterior bag 103 is fixed to the cap 101, binding of individual caulking rings 104 Since the force is not improved, in particular, the caulking ring disposed on the side of the stationary flow back end (the caulking ring disposed on the rightmost side in FIG. 9) is expanded as the stationary flow plug 100 expands. It is easy to be deformed in diameter, and there is a possibility that the displacement of the outer layer bag 103 may occur as it is used for a long time.

  The present invention has been made to solve such a problem, and it is an object of the present invention to provide a stationary flow plug which exhibits high stationary flow performance without causing positional displacement of the outer layer bag.

  The above object of the present invention is to provide an inflatable and contractible inner bag having a cylindrical base having a rigidity connectable to a fluid supply and discharge pipe for supplying and discharging a fluid at one end, an expansion restriction and protection of the inner bag A stationary flow plug including an exterior bag for enclosing the interior bag, the first caulking ring for externally pressing and pressing the base through the mouth of the exterior bag, and externally fitting the first caulking ring And a second caulking ring to be crimped.

  As described above, by fixing the mouth of the outer bag to the base by the double caulking structure, the mouth of the outer layer bag is pulled out from the caulking portion as the inner bag and outer layer bag of the stationary plug expand. Even if a force is applied, or even if a strong force to expand the diameter of the first crimping ring is generated, the movement of the mouth of the exterior bag or the first crimping is performed by the action of the binding force by the second crimping ring. The diameter expansion of the ring can be prevented, the occurrence of positional displacement of the exterior bag can be extremely effectively suppressed, and high water stopping performance can be exhibited.

  Further, in the stationary flow plug, the second caulking ring is arranged so as to be folded back toward the first caulking side of the mouth of the outer bag, which is arranged to be folded back toward the first caulking side. It is preferable that the first crimp ring be externally crimped via at least one of the mouth tip of the interior bag. By adopting such a configuration, it is possible to allow the second crimping ring to strangle the first crimping ring, including the mouth tip of the outer bag and / or the mouth tip of the inner bag. While preventing the diameter expansion of the crimping ring, it is possible to more effectively suppress the movement (displacement) of the front end of the mouth of the exterior bag or the like, and it is possible to exhibit high water stopping performance.

  Further, the mouth tip end of the exterior bag arranged to be folded back to the first crimping side, and / or the mouth tip end of the interior bag arranged to be folded back to the first crimping side, It is preferable that the entire area of the first crimping is covered so as to be folded back. By adopting such a configuration, the second crimping can effectively suppress the movement (displacement) of the front end of the mouth of the exterior bag or the like.

  Moreover, it is preferable that the thickness of the said outer-layer bag is 0.1 mm-0.7 mm. By setting the thickness dimension of the exterior bag within the above numerical range, it becomes possible to stably perform double crimping of the exterior bag mouth by the first crimping and the second crimping while maintaining the strength of the exterior bag. Thus, it is possible to effectively suppress the positional deviation of the exterior bag caused by the expansion of the stationary flow plug.

  The outer bag is preferably made of a high strength polyethylene fiber and 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-made 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 high tensile strength is maintained. In addition, a flexible exterior bag can be obtained.

  Further, the outer layer bag is formed by sewing a cloth material into a bag shape, and a step difference which is stepped toward the lower cloth material at an edge portion of a sewn portion where the cloth materials are overlapped. It is preferable that a portion be formed, and the step portion be provided with a step relief portion having an inclined surface which is inclined toward the lower cloth material. By providing such a step reducing portion, it is possible to effectively prevent the deterioration of the water blocking property caused by the presence of the step portion.

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

It is a schematic structure top view of the still flow plug concerning the present invention. It is a principal part expanded sectional view of the still-flow plug shown in FIG. It is explanatory drawing for demonstrating the level | step-difference part which may be formed in the exterior bag surface. It is a perspective view for demonstrating the modification of the still-flow plug shown in FIG. It is explanatory drawing for demonstrating the modification of the still-flow plug shown in FIG. It is a principal part expanded sectional view concerning a conventional still-flow plug. It is a use condition figure of a stationary flow plug. It is explanatory drawing for demonstrating the problem which the conventional stationary flow plug has. It is a principal part expanded sectional view concerning the still-flow plug which has the conventional other form.

  Hereinafter, a still flow plug according to the present invention will be described with reference to the attached 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 a still flow plug 1 according to the present invention, and FIG. 2 is an enlarged sectional view of the main part thereof. This stationary flow plug 1 is used to temporarily shut off the water inside the water pipe during construction such as when repairing or replacing the middle part of the water pipe or when newly connecting a branch pipe to the middle part of the water pipe. Used from the stationary flow device B attached to the water pipe A, as described in the background art, in the contracted state to the water pipe A through the stationary flow plug insertion hole C drilled in the water pipe A A stationary flow plug 1 is disposed, and gas or liquid such as air or water or a mixture thereof is supplied into the stationary flow plug 1 from a fluid supply / discharge pipe D connected to a mouth 21 of the stationary flow plug 1 It is used by inflating the plug 1. In the present embodiment, the case where tap water in a water pipe is stopped (stop water) will be described as an example, but the fluid in the pipe performing the stop 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.

  The stationary flow plug 1 which concerns on this invention is provided with the interior bag 2 and the exterior bag 3, and is comprised, as shown to FIG. 1 and FIG. The inner bag 2 has an expandable / contractible structure in which a cylindrical base 21 having rigidity connectable to a fluid supply / discharge pipe D for supplying / discharging a fluid is provided at one end, and the outer bag 3 The inner bag 2 is disposed to enclose the inner bag 2 for the purpose of regulating and protecting the inner bag 2.

  The inner bag 2 is made of rubber having air tightness and flexibility, and is formed in a spheroid shape having a major axis and a minor 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 mouthpiece 21 is a cylindrical member having a rigidity connectable to the fluid supply and discharge pipe D for supplying and discharging a fluid, and closes the opening provided at one end of the long axis of the inner bag 2 As described above, a mouthpiece main body 21a bonded and integrated to the interior bag 2, a first enlarged diameter portion 21b having a diameter larger than that of the mouthpiece main body 21a, and a second enlarged diameter portion 21c are provided. The first enlarged diameter portion 21b is disposed on one end side of the mouthpiece main body 21a and exposed to the outside, and the second enlarged diameter portion 21c is disposed on the other end side of the mouthpiece main body 21a. Will be placed. The first enlarged diameter portion 21 b and the second enlarged diameter portion 21 c have a function as a retention for the crimping ring. A through hole 21 d penetrating in the axial direction is formed in the central portion of the mouth ring 21. The through hole 21d opens toward the inside of the interior bag 2, and a female screw is formed on the side of the first enlarged diameter portion 21b of the inner peripheral surface. The fluid supply / discharge pipe D is connected to the mouthpiece 21 (the stationary flow plug 1) by screwing the tip of the fluid supply / discharge pipe D for supplying / discharging the fluid to the female screw, and through the through hole 21d. The inner bag 2 is expanded by the action of fluid (air, water or the like) supplied from the fluid supply and discharge pipe D.

  The exterior bag 3 has a function of regulating excessive expansion of the interior bag 2 and maintaining its shape when inflated, as well as protecting the interior bag 2 from protrusions and the like that may cause damage, rupture or the like. The exterior bag 3 is housed so as to encapsulate the interior bag 2, and the mouth of the exterior bag 3 corresponding to the base 21 of the interior bag 2 is bound and fixed by a first crimping ring 4 and a second crimping ring 5 described later. ing.

  The first caulking ring 4 with the predetermined length of the mouth end of the outer bag 3 drawn to the side of the first enlarged diameter portion 21 b of the mouthpiece 21, the mouthpiece 21 of the outer bag 3 (mouthpiece body 21 a) Is a member for externally press-fitting. The second crimping ring 5 is folded back after the mouth tip end of the exterior bag 3 disposed closer to the first expanded diameter portion 21b of the mouth ring 21 than the first crimping ring 4 is folded back to the first crimping ring 4 side. The first crimping ring 4 is a member that is externally fitted and crimped via the distal end portion of the mouth. The first crimping ring 4 and the second crimping ring 5 are formed in an annular shape, for example, with a metal such as lead, tin, aluminum, copper or the like, and are configured so as to be able to undergo diameter reduction deformation using a crimping tool or the like. is there.

  Here, the folding dimension of the mouth end of the outer bag 3 disposed to be folded back on the side of the first crimping ring 4 installed on the mouthpiece 21 may be set appropriately, for example, the surface of the first crimping ring 4 The folding dimension may be set so as to cover a part of the first one, or may be set so as to cover the entire area of the first crimping ring 4. From the viewpoint of effectively fixing the exterior bag 3 to the mouthpiece 21 by the first crimping ring 4 and the second crimping ring 5, setting the folded dimension so as to cover the entire area of the first crimping ring 4 preferable.

The exterior bag 3 is preferably made of a flexible fabric, an elastomer, a rubberized cloth, or the like, which has high tensile strength, low water permeability, and flexibility. Moreover, as thickness of the exterior bag 3, it is preferable to use the thing of the range of 0.1 mm-0.7 mm, for example, and it is more preferable to use the thing of the range of 0.15 mm-0.55 mm. Moreover, when forming the exterior bag 3 from the cloth-made raw material, it is although it does not specifically limit as a fiber raw material which comprises this cloth-made raw material, It is preferable to comprise from high strength polyethylene fiber. The strength of the fabric material formed of high strength polyethylene fiber is preferably in the range of 1.5 kN / 3 cm to 8 kN / 3 cm for both warp and weft, and 2.7 kN / 3 cm to 6.7 kN / It is further preferred to use one in the range of 3 cm. Moreover, as a fabric weight of the cloth-made material formed from high strength polyethylene fiber, it is preferable to use the thing of the range of 80g / sqm-300g / sqm, and use the thing of the range of 90g / sqm-250g / sqm Is more preferred. It is to be noted that the basis weight means the weight per 1m ^2. By constructing the exterior bag 3 using a cloth-made material formed from such high-strength polyethylene fibers, the thickness of the exterior bag 3 may be configured to be relatively thin, for example, 0.1 mm to 0.7 mm. It becomes easy and can obtain the flexible exterior bag 3 maintaining the above high tensile strength (strength).

  In addition, as a method of forming the exterior bag 3, various methods are adopted such as a method of forming by forming a bag shape from various fiber materials, a method of forming a sheet-like cloth material by sewing in a bag shape, For example, when forming a sheet-like cloth material into a bag shape, as shown in the schematic perspective view of FIG. 3 (showing a partial cross section), the cloth materials are overlapped. At the edge of the stitched portion H, a stepped portion 31 which is stepped down toward the lower cloth material 3a is formed. When the stationary flow plug 1 is used by expanding the stationary flow plug 1 in the water pipe A, the stepped portion 31 may form a flow path through which water may leak 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 disposed in the water pipe A along the extending direction of the water pipe A, there is a high possibility that the water blocking property of the water blocking plug 1 is reduced. I will. Therefore, as shown in the schematic perspective view of FIG. 4, the step portion 31 is provided with a step reducing portion 6 having an inclined surface which inclines toward the lower fabric material 3 a along the longitudinal direction thereof. It may be configured. The level difference reducing portion 6 can be formed, for example, by coating and forming an adhesive such as an epoxy or acrylic adhesive along the level difference portion 31. Further, as shown in a schematic perspective view of FIG. 5 (a), an elongated step relieving portion 6 having an inclined surface is prepared in advance using an elastomer material such as rubber, and is provided to the step portion 31 via an adhesive. It may be fixed along. Further, as shown in a schematic perspective view of FIG. 5 (b), a flat insertion portion 6a is connected to a long step relieving portion 6 having an inclined surface configured using an elastomer material, As shown in the cross-sectional view of FIG. 5C, at the stage before sewing, the insertion portion 6a is interposed between the upper and lower fabric materials to be sewn together and fixed by an adhesive or the like, and the lower fabric material 3a, The step relieving portion 6 may be disposed along the step portion 31 by sewing the insertion portion 6 a and the upper cloth material 3 b integrally.

  Hereinafter, the operation and effect of the still flow plug 1 according to the present invention will be described. First, the stationary flow plug 1 according to the present invention has a double caulking structure including a first caulking ring 4 for fitting the mouth of the outer bag 3 to the outside and a second caulking ring 5 for caulking the first caulking ring 4 on the outside. Therefore, even if the force to pull out the mouth of the exterior bag 3 from the caulking portion acts with the expansion of the stationary flow plug 1, the movement (displacement) of the mouth of the exterior bag 3 It becomes possible to prevent. Also, even if a strong force is generated to expand the diameter of the first crimping ring 4 at the contact point between the first crimping ring 4 and the exterior bag 3 due to the expansion of the stationary flow plug 1, the second crimping ring 5 By the action of the binding force, the diameter expansion can be prevented, the occurrence of the positional deviation of the exterior bag 3 can be extremely effectively suppressed, and a high water stopping performance will be exhibited.

  Further, in the still flow plug 1 according to the present invention, the mouth tip end portion of the exterior bag 3 is fixed on the first crimping ring 4 by the second crimping ring 5 in a state of being folded back to the first crimping ring 4 side There is. Therefore, even if a force that causes the mouth of the outer bag 3 to slip out from the caulking portion with expansion of the stationary flow plug 1, a predetermined end of the mouth that is folded back and abuts against the corner of the first crimping ring 4. The portion 32 exerts a strong resistance, and the positional displacement of the exterior bag 3 can be effectively prevented.

  Also, when the exterior 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 following is performed when the front end of the mouth of the exterior bag 3 is folded back to the first crimping ring 4 side. It also has excellent flexibility, and also has excellent followability to the diameter reduction deformation of the second crimping ring 5 when the first crimping ring 4 is crimped by means of the second crimping ring 5 via the tip of the mouth. It becomes possible to do stably. As a result, it is possible to more effectively suppress the positional deviation of the exterior bag 3 caused by the expansion of the stationary flow plug 1. In addition, 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 diameter expansion of the interior bag 2 inflated in the water pipe A. It becomes easy to do, it becomes possible to control effectively that the crevice which the water leaks is formed with the water pipe inner wall, it becomes possible to show high water-stopping property.

  Further, although the stationary flow plug 1 according to the present invention has a structure in which the mouth of the outer bag 3 is fixed to the mouthpiece 21 by a plurality of caulking rings, the long length as shown in FIG. Since a plurality of caulking rings are not arranged along the axial direction of the mouthpiece 21 but the double caulking structure is provided, it is possible to prevent the mouthpiece 21 from being elongated. As a result, when inserting the stationary flow plug 1 into the water pipe A through the stationary flow plug insertion hole C drilled in the water pipe A by approximately 90 °, the mouthpiece 21 is the stationary flow plug insertion hole Interference with the C outlet can be effectively prevented.

  As mentioned above, although the still flow plug 1 which concerns on one Embodiment of this invention was demonstrated, the specific structure of the still flow plug 1 is not limited to the said embodiment. For example, in the above embodiment, after the mouth tip end of the exterior bag 3 disposed closer to the first enlarged diameter portion 21b of the mouthpiece 21 than the first crimping ring 4 is folded back to the first crimping ring 4 side, the second Although the crimping ring 5 is configured to press-fit the first crimping ring 4 via the folded end of the mouth, the end of the mouth of the outer bag 3 is folded back to the first crimping ring 4 side. Alternatively, the second crimping ring 5 may be configured to directly press-fit the surface of the first crimping ring 4. Even with such a configuration, even if the force to extract the mouth of the outer layer bag 3 from the caulking portion acts with the expansion of the inner bag 2 and the outer layer bag 3 of the stationary flow plug 1, or the first Even if a strong force for expanding the diameter of the crimping ring 4 is generated, the movement of the mouth of the exterior bag 3 and the diameter expansion of the first crimping ring 4 are prevented by the action of the binding force by the second crimping ring 5 It is possible to extremely effectively suppress the occurrence of positional displacement of the exterior bag 3 and to exhibit high water stopping performance.

  Further, in the above embodiment, the second crimping ring 5 is configured to externally crimp the first crimping ring 4 via the mouth end of the exterior bag 3 folded back to the first crimping ring 4 side. However, the present invention is not particularly limited to such a configuration. For example, after both the end of the mouth of the exterior bag 3 and the end of the mouth of the interior bag 2 are folded back to the first crimping ring 4 side, the second crimping ring 5 is used to fold the exterior bag 3 and the interior bag 2. The first crimping ring 4 may be configured to be crimped externally by means of the two mouth tips. When such a configuration is adopted, it is preferable that the front end of the mouth of the outer bag 3 and the front end of the mouth of the inner bag 2 be folded back so as to cover the entire area of the first crimping ring 4.

  Further, the front end of the mouth of the outer bag 3 is not folded back to the first crimping ring 4 side, only the front end of the mouth of the inner bag 2 is folded back to the first crimping ring 4 side. The second crimping ring 5 may be configured to externally crimp the first crimping ring 4. In the case of such a configuration, the tip end of the mouth of the inner bag 2 is firmly sandwiched by the first and second caulking rings 4 and 5, so that the inner bag 4 can be prevented from being displaced. It is possible to prevent the positional displacement of the exterior bag 3 due to the positional displacement of the internal bag 4. In addition, when employ | adopting such a structure, it is preferable that the opening front-end | tip part of the interior bag 2 is return | folded so that the whole area of the 1st crimping ring 4 may be coat | covered.

DESCRIPTION OF SYMBOLS 1 stationary flow plug 2 interior bag 21 base 3 exterior bag 4 1st caulking ring 5 2nd caulking ring 6 level difference relieving part

Claims (6)

An expandable and retractable inner bag having a cylindrical base having a rigidity connectable to a fluid supply and discharge pipe for supplying and discharging a fluid is provided at one end, and the inner bag is covered for the expansion restriction and protection of the inner bag. A stationary plug comprising an outer packaging bag,
A first crimping ring that externally crimps the base by means of the mouth of the outer bag;
A stationary flow plug comprising: a second crimping ring that externally crimps the first crimping ring.   The second crimping ring is a mouth tip end portion of the exterior bag disposed folded back on the first crimping side, and a mouth tip end portion of the interior bag disposed folded back on the first crimping side The stationary flow plug according to claim 1, wherein the first crimp ring is externally crimped via at least one of the two.   The mouth tip end of the exterior bag disposed folded back to the first crimping side and / or the mouth tip tip of the interior bag disposed folded back to the first crimping side are the first The stationary flow plug according to claim 2, which is folded back so as to cover the entire area of the crimping.   The stationary flow plug according to any one of claims 1 to 3, wherein a thickness of the outer layer bag is 0.1 mm to 0.7 mm.   The water blocking plug according to any one of claims 1 to 4, wherein the outer layer bag is made of a high strength polyethylene fiber and made of a cloth material having a strength of 1.5 kN / 3 cm to 8 kN / 3 cm. The outer layer bag is formed by sewing a cloth material into a bag shape, and at the edge of a sewn portion where the cloth materials are superimposed, a stepped portion stepped down toward the lower cloth material is formed. Is formed,
The water blocking plug according to any one of claims 1 to 5, wherein the step portion is provided with a step reducing portion having an inclined surface which is inclined toward the lower side fabric material.

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