JP2009209956A - Fluid cutoff bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid cutoff bag having high safety capable of preventing a bag body from suddenly withering when fluid flows out of the inside in use. <P>SOLUTION: This fluid cutoff bag 10 has the bag body 1 composed of rubber or an elastic synthetic resin and formed in a cylindrical shape, and a joint member 8 for connecting the bag body 1 and a fluid supply-discharge pipe 28 for supplying/discharging the fluid to the bag body 1, and is sealed by sandwiching the other end of the bag body 1 by the joint member 8 inserted into the other end and a second cylindrical member 5 surrounding the outside of the other end, by sealing by sandwiching one end of the bag body 1 by a plug member 4 inserted inside the one end and a first cylindrical member 5 surrounding the outside of the one end, in a diametrically contracted state by folding up the bag body 1. Communicating holes 46 and 87 communicating with the inside of the bag body 1, are arranged in a part covered with the bag body 1 among an outer peripheral surface of at least one member of the plug member 4 and the joint member 8. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention comprises a bag body made of rubber or elastic synthetic resin and formed in a cylindrical shape, and a joint member for connecting the bag body and a fluid supply / discharge pipe for supplying and discharging fluid to and from the bag body. In a state where the bag body is folded and reduced in diameter, one end of the bag body is sandwiched between a plug member inserted inside the one end and a first tubular member surrounding the outside of the one end and sealed. The present invention also relates to a fluid blocking bag in which the other end of the bag body is sandwiched and sealed between the joint member inserted into the other end and a second cylindrical member surrounding the outside of the other end.

  Conventionally, a fluid blocking bag is used for construction work such as repairing or replacing a middle part of an existing fluid conduit, such as a gas pipe or a water pipe, or connecting a new branch pipe to the middle part. Used to temporarily shut off fluid inside the conduit.

  As this type of fluid blocking bag, a bag body made of an organic polymer material having elasticity and formed into a cylindrical shape in an inflated state is provided, and the bag body is formed with a large number of ridges in the circumferential direction over its entire length. Are folded and formed in a state in which a large number of scissors are wound in a spiral shape with a cross-sectional shape, and a shape retaining portion that maintains the wound state of the scissors is provided at the distal end portion and the proximal end portion of the bag body. It is known that each is provided and the bag body is sealed at the distal end portion, and a fluid supply / discharge tube is connected to the inside of the bag body at the proximal end portion (see, for example, Patent Document 1).

  In such a fluid blocking bag, during construction, a fluid blocking bag having a reduced diameter is inserted into the fluid conduit through a hole provided at a predetermined position of the fluid conduit, and the fluid is blocked through the fluid supply / discharge pipe. A fluid such as air is supplied into the interior of the bag for inflating the bag body, and its outer peripheral surface is brought into close contact with the inner surface of the fluid conduit to block the fluid inside the fluid conduit. After the construction is completed, the fluid is discharged from the fluid blocking bag through the fluid supply / discharge pipe, the bag body is returned to the reduced diameter state, and is taken out from the fluid conduit.

Japanese Unexamined Patent Publication No. 7-190284

  However, since the conventional fluid blocking bag repeats expansion and contraction of the bag body each time it is used, a load is applied to one or both of the shape retaining portions provided at both ends of the bag body each time the bag is expanded. Therefore, as the number of times of use increases, there is a problem that the shape retaining portion gradually moves outward from the original attachment position of the bag body and is easily detached from the bag body.

  For this reason, if you do not realize that the shape retaining part is easily detached from the bag body and continue to use the fluid blocking bag, the shape retaining part will come off the bag body during use and fluid will flow out from the inside. The bag body suddenly wilted and there was a risk that the fluid inside the fluid conduit would flow out even during construction.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly safe fluid-blocking bag that can prevent fluid from flowing out from the inside during use and suddenly deflating the bag body. It is what.

  In order to achieve the above object, a first characteristic configuration of a fluid blocking bag according to the present invention is a bag body made of rubber or an elastic synthetic resin and formed into a cylindrical shape, and the bag body and the bag body are made of fluid. A coupling member that connects a fluid supply / discharge pipe that supplies and discharges, and in a state where the bag body is folded and reduced in diameter, a plug member that is inserted into the inside of the one end of the bag body; A second cylindrical shape surrounding the outer side of the other end of the bag body with the other end of the bag body sandwiched between and sealed with a first cylindrical member surrounding the outer side of the one end. A fluid blocking bag that is sandwiched between and sealed with a member, wherein the bag body covers a portion of the outer peripheral surface of at least one of the plug member and the joint member that is covered by the bag body. Communicate with It lies in having a communicating hole.

According to this configuration, the communication hole provided on the outer peripheral surface of at least one of the plug member and the joint member is normally covered with the bag body and sealed. When the plug member or the joint member moves outward with respect to the bag body due to repeated use or the like, the communication hole is exposed from the bag body, and the outside communicates with the inside of the bag body. When used in such a state, the fluid flows out from the inside of the bag body through the communication hole, so that the abnormality of the bag body can be found before the plug member or the joint member is completely detached from the bag body.
Therefore, it is possible to provide a highly safe fluid blocking bag that can prevent the plug member or the joint member from being detached from the bag main body during use and the bag main body from being suddenly deflated.

  In the second characteristic configuration of the fluid blocking bag according to the present invention, the part has at least one protrusion, and the communication hole is provided on the outer side in the longitudinal direction of the member from at least one of the protrusions. In the point.

  If at least one protrusion is provided on a portion of the outer peripheral surface of at least one member of the plug member and the joint member that is covered by the bag body as in this configuration, the resistance of the plug member and the joint member with respect to the bag body Power increases and it becomes difficult to move. For this reason, if the communication hole is provided on the outer side in the longitudinal direction of the plug member or the joint member from at least one of the protrusions, the plug member or the joint member moves outward with respect to the bag body, and the communication hole becomes the bag. Even when exposed from the main body, at least one protrusion remains covered with the bag main body, and the plug member or joint member can be prevented from coming off from the bag main body at once. Therefore, it is possible to secure a time delay from when the fluid inside the bag body begins to flow out of the communication hole until the plug member or the joint member is completely removed.

  According to a third characteristic configuration of the fluid blocking bag according to the present invention, the protrusion is an annular protrusion provided over the entire circumference of the outer peripheral surface, and includes at least two along the longitudinal direction of the member. The communication hole is provided at the inner side in the longitudinal direction of the member than at least one of the annular protrusions.

  According to this configuration, since the communication hole is provided in the longitudinal direction inside of the plug member or the coupling member from at least one of the annular protrusions, the annular protrusion and the communication hole are covered with the bag body. Even if the fluid inside the bag body leaks from the communication hole, the annular protrusion prevents the fluid from flowing out between the bag body and the plug member or joint member. And the sealed state of the bag body can be secured.

  A fourth characteristic configuration of the fluid blocking bag according to the present invention is that the portion has at least one protrusion, and the communication hole is provided in at least one of the protrusions.

  According to this configuration, since the projecting portion is the position where the pressing force of the bag body is the most, in the state where the communication hole is covered with the bag body, the plug member or the joint member moves and the communication hole moves to the bag body. Even when approaching the end, the fluid inside the bag main body is prevented from leaking out from the communication hole, and the fluid inside the bag main body flows out only after the communication hole is exposed from the bag main body. For this reason, the position of the plug member or joint member relative to the bag body can be accurately identified by observing the outflow of fluid from the communication hole, the internal pressure of the bag body, and the like.

  A fifth characteristic configuration of the fluid blocking bag according to the present invention is that a plurality of the communication holes are provided along the longitudinal direction of the member.

  If a plurality of communication holes are provided along the longitudinal direction of the plug member or joint member as in this configuration, the communication holes are sequentially exposed from the bag body as the plug member or joint member moves relative to the bag body. The amount of fluid flowing out from the communication hole inside the main body changes. Therefore, the position of the plug member or joint member relative to the bag body can be grasped in stages by observing the outflow state of the fluid from the communication hole and the change in the internal pressure of the bag body.

  In a sixth characteristic configuration of the fluid blocking bag according to the present invention, the outer circumferential surface of at least one of the first tubular member and the second tubular member penetrates in the radial direction of the tubular member. It is in the point which provided the through-hole.

When the plug member and the joint member move relative to the bag body, the first cylindrical member and the second cylindrical member move along with the plug member and the joint member.
According to this configuration, since the state inside the first tubular member or the second tubular member can be examined through the through hole, the position of the bag body with respect to the first tubular member or the second tubular member is determined. It can be confirmed, and the abnormality of the bag body can be found.

  A seventh characteristic configuration of the fluid blocking bag according to the present invention lies in that the through hole is provided on the outer side in the longitudinal direction of the cylindrical member with respect to the communication hole.

  According to this configuration, since the through hole is provided in the longitudinal direction outside of the first tubular member or the second tubular member from the communication hole, the plug member or the joint member is the first tubular member or the second tubular member. When it moves with respect to the bag body and the communication hole is exposed from the bag body, the bag body does not exist at the position where the through hole is provided. Thereby, since the fluid inside the bag body that has flowed out of the communication hole flows out to the outside through the through hole, the outflow of the fluid can be quickly detected.

Hereinafter, an embodiment of a fluid blocking bag according to the present invention will be described with reference to the drawings.
As shown in FIGS. 6 and 7, the fluid blocking bag 10 according to the present embodiment is, for example, in the construction section A when repairing or replacing the middle portion of the gas pipe 7 as a fluid conduit. Used to shut off gas at both ends. That is, first, in the vicinity of both ends of the construction section A of the gas pipe 7, a drilling device 25 for performing drilling, blocking, and temporary contact with no blow is attached. Next, the fluid blocking bag 10 is inserted into the gas pipe 7 from an oblique direction through the inclined pipe 26 provided in the perforating apparatus 25 to block the inflow of gas into the construction section A.

  When the fluid blocking bag 10 according to the present embodiment is inserted into the gas pipe 7, the diameter is reduced as shown in FIG. 2, and the hard pipe 2 and the flexible pipe 28 as the fluid supply / discharge pipe are provided. By supplying air as a fluid through the inside, a bag body 1 that expands into a cylindrical shape as shown in FIG. 1 is provided. In the inflated state, the bag body 1 is configured so that the peripheral surface thereof is elastically adhered to the inner surface of the gas pipe 7 and the gas pipe 7 is hermetically shut off. After the construction is completed, air is discharged from the bag body 1 through the flexible tube 28 and the hard tube 2, the bag body 1 is returned to a reduced diameter state and taken out from the gas tube 7.

  As shown in FIG. 3A, the bag body 1 is formed by, for example, winding a rubberized fabric 21 formed by pulling chloroprene rubber or the like around a base fabric 20 made of nylon or the like, and overlapping the ends. The cylindrical body 22 is formed by bonding with an adhesive. In this embodiment, the warp of the base fabric 20 is arranged along the longitudinal direction of the cylindrical body 22, the weft is arranged along the circumferential direction of the cylindrical body 22, and the warp is less stretched than the weft. In addition, the pressure resistance of the bag body 1 is increased by using fibers having a large tensile strength.

  The bag body 1 is folded so as to form a large number of ridges 23 in the circumferential direction over the entire length of the cylindrical body 22 as shown in FIG. 3 (b), and then each ridge as shown in FIG. 3 (c). 23 is wound in one direction so as to form a spiral shape with a cross-sectional shape, and is formed into a rod shape. As shown in FIG. 2, the bag body 1 is provided with shape retaining portions 3 at both ends in this state, and retains its shape.

As shown in FIG. 4, the shape retaining portion 3 has one end side shape retaining portion 31 provided at one end of the bag body 1 and the other end shape retaining portion 32 provided at the other end of the bag body 1. .
The one end side shape retaining portion 31 has a metal plug member 4 inserted inside one end of the bag body 1, and a rubber cylindrical body 11 and a metal first cylindrical member 5 are placed outside one end of the bag body 1. Covering in this order and applying a force from the outside to the first tubular member 5 and caulking to deform the first tubular member 5 toward the plug member 4, and one end of the bag body 1 is connected to the plug member 4 and the first One end of the bag body 1 is sealed by being sandwiched between one cylindrical member 5.

  The stopper member 4 is provided with a recess 41 so as to open toward the inside of the bag body 1. On the outer peripheral surface of the plug member 4, there are a locking portion 42 that engages with the first tubular member 5, and protrusions 43, 44, 45 for making it difficult for the plug member 4 to be removed from the bag body 1. It is provided in an annular shape over the entire area. A communication hole 46 communicating with the inside of the bag body 1 is provided between the protrusion 43 and the protrusion 44 on the outer peripheral surface of the stopper member 4. The communication hole 46 has a hole diameter of about 1 to 2 mm and is covered with the bag body 1 in a normal state, so that a sealed state on one end side of the bag body 1 is ensured. Further, the tip of the plug member 4 is covered with a light and hemispherical resin cap 47 such as polyacetal, Teflon, nylon, etc., which is slippery and lightweight.

  The first tubular member 5 is formed of a steel material or the like that can be plastically deformed with a set load. One end of the first tubular member 5 is bent inward to engage with the locking portion 42 of the plug member 4. A collar 51 is formed. On the outer peripheral surface of the first tubular member 5, a through hole 52 penetrating in the radial direction of the first tubular member 5 is provided so as to be positioned on the outer side in the longitudinal direction of the first tubular member 5 with respect to the communication hole 46. is there.

  The other end side shape retaining portion 32 has one end 81 of the metal joint member 8 inserted inside the other end of the bag body 1, and the rubber-like cylinder 13 and the metal made outside the other end of the bag body 1. The second tubular member 6 is covered in this order, and the second tubular member 6 is deformed to the one end 81 side of the joint member 8 by applying a force from the outside to the second tubular member 6 and caulking. The other end of the bag body 1 is sealed by sandwiching the other end of the bag body 1 between the one end 81 of the joint member 8 and the second tubular member 6.

  On the outer peripheral surface of the one end portion 81 of the joint member 8, similarly to the plug member 4, an engaging portion 83 that engages with the second tubular member 6, and the joint member 8 is made difficult to come off from the bag body 1. The protrusions 84, 85, 86 are provided in an annular shape over the entire circumference, and the portion of the bag body 1 between the protrusion 84 and the protrusion 85 is covered with the inside of the bag body 1. A communication hole 87 that communicates is provided.

  The second tubular member 6 is formed of a steel material or the like that can be plastically deformed with a set load, similarly to the first tubular member 5, and one end portion thereof is bent inward to engage the joint member. A flange 61 for engaging with the stopper 83 is formed. On the outer peripheral surface of the second cylindrical member 6, a through hole 62 that penetrates in the radial direction of the second cylindrical member 6 is provided so as to be positioned on the outer side in the longitudinal direction of the second cylindrical member 6 with respect to the communication hole 87. is there.

  The other end 82 of the joint member 8 is connected to a flexible tube 28 made of rubber, polyurethane, polyethylene, nylon or the like. That is, the other end 82 having an annular protrusion 88 provided on the outer peripheral surface over the entire circumference is inserted inside one end of the flexible tube 28, and a rubber-like cylinder is formed outside the one end of the flexible tube 28. 14. Cover the third tubular member 15 made of steel or the like in this order, and apply the force to the third tubular member 15 from the outside to crimp the third tubular member 15 toward the other end 82. The joint member 8 and the flexible tube 28 are connected with good airtightness by sandwiching one end of the flexible tube 28 between the other end 82 and the third cylindrical member 15.

  A steel hard tube 2 is connected to the other end of the flexible tube 28 via a connecting member 12 and constitutes a fluid supply / discharge tube together with the flexible tube 28 and the like. That is, one end of the connection member 12 is inserted inside the other end of the flexible tube 28, and a fourth tubular member 33 made of steel or the like is placed on the outside of the other end of the flexible tube 28, and the flexible tube is crimped. 28 and the connection member 12 are connected, and the other end of the connection member 12 is screwed to the hard tube 2 to connect the connection member 12 and the hard tube 2.

  With the fluid blocking bag 10 configured as described above, for example, due to repeated use or caulking defects, improper use conditions, etc., the one-end-side shape retaining part 31 is the bag body as shown in FIG. 1, the communication hole 46 of the plug member 4 is exposed from the bag body 1 so that the outside communicates with the inside of the bag body 1. Therefore, if the use is continued in such a state, the fluid flows out from the inside of the bag body 1 through the communication hole 46, so that the one-end side shape retaining portion 31 is caused to change by the change in the internal pressure of the bag body 1 or the like. An abnormality of the bag body 1 can be found before it is completely removed from the bag.

  At this time, since the communication hole 46 is provided outside the annular protrusion 44, the protrusions 44 and 45 remain covered with the bag body 1 even when the communication hole 46 is exposed from the bag body 1. It becomes a state and it can prevent that the one end side shape retaining part 31 remove | deviates from the bag main body 1 at a stretch. Therefore, since there is a time delay until the one-end-side shape retaining portion 31 is detached from the bag body 1, the user who has noticed the outflow of air should replace the fluid blocking bag 10 with a margin even during construction. It can be carried out.

  Further, since the through hole 52 penetrating in the radial direction is provided on the outer peripheral surface of the first cylindrical member 5 so as to be positioned on the outer side in the longitudinal direction of the first cylindrical member 5 with respect to the communication hole 46, The state inside the first cylindrical body 5 can be checked from 52, and the air flowing out from the communication hole 46 flows out to the outside through the through hole 52, and the outflow of air from the communication hole 46 is quickly detected. Can do.

  In the present embodiment, the communication hole 46 is provided inside the annular protrusion 43. For this reason, in the state where the communication hole 46 and the protrusion 43 are covered with the bag body 1, even if air inside the bag body 1 leaks from the communication hole 46, the bag body is formed by the annular protrusion 43. 1 and the plug member 4 can be prevented from flowing out and the bag body 1 can be sealed.

  In the following, an embodiment using the fluid blocking bag 10 shown in FIGS. 1 and 2 will be shown as a fluid blocking bag according to the present invention, and the present invention will be described in more detail. However, the present invention is not limited to these examples.

  In this embodiment, as shown in FIG. 8, air is supplied to the inside of the bag body 1 using the plug member 4 provided with communication holes 46 at positions I, II, III, IV, V on the outer peripheral surface. Then, when the pressure was repeatedly applied to 0.09 MPa 200 times, and when the plug member 4 was held at 70 ° C. while being pressurized to 0.09 MPa, the outflow state of air to the bag body 1 was examined. In the present embodiment, the caulking rate of the first tubular member 5 is set to about 5% with respect to the outer diameter of the bag main body 1 in order to set the stopper member 4 in an easily movable state (usually 10 to 10%). 15%).

As a result, as shown in Table 1, in the case where pressure was repeatedly applied to 0.09 MPa 200 times, in any case, no air flowed out and the sealed state was maintained. Moreover, when it hold | maintained at 70 degreeC in the state pressurized to 0.09 Mpa, it turned out that the time until air flows out becomes longer when the communicating hole 46 is provided in the longitudinal direction inner side of the plug member 4. However, it was found that when the communication hole 46 is provided at the position V, the plug member 4 comes off with the outflow of air. This is presumably because, after the communication hole 46 is exposed at the position V, no protrusion exists between the bag body 1 and the plug member 4 and the movement resistance force of the plug member 4 with respect to the bag body 1 is reduced. Is done.
Therefore, in the present Example, it turned out that it is preferable to provide the communicating hole 46 in the position of III or IV.

[Another embodiment]
In the above-described embodiment, the case where the communication hole 46 of the plug member 4 is provided between the protrusions 43 and 44 has been described as an example. However, as illustrated in FIG. 44 may be provided. Since the protrusions 43, 44, and 45 are positions where the pressing force of the bag body 1 is most applied, even when the communication hole 46 approaches the end of the bag body 1 in a state where the communication hole 46 is covered with the bag body 1. The fluid inside the bag body 1 is prevented from leaking to the outside from the communication hole 46, and the fluid inside the bag body 1 flows out to the outside only after the communication hole 46 is exposed from the bag body 1. Therefore, the position of the plug member 4 relative to the bag body 1 can be accurately identified by observing the outflow of fluid from the communication hole 46, the internal pressure of the bag body 1, and the like.

  In the above embodiment, the case where one communication hole 46 is provided has been described as an example. However, as shown in FIG. 9B, two protrusions 46 a and 46 b are provided along the longitudinal direction of the plug member 4. It can also be provided. If two communication holes 46 are provided along the longitudinal direction of the plug member 4, the communication holes 46 a and 46 b are exposed in order from the bag body along with the movement of the plug member 4 with respect to the bag body 1. Air outflow changes. For this reason, the position of the plug member 4 with respect to the bag body 1 can be grasped in stages by observing the outflow state of air from the communication hole 46 and the change in the internal pressure of the bag body 1. Note that the number of communication holes 46 is not limited to two, and three or more communication holes 46 may be provided, and the sizes of the holes when two or more communication holes 46 are provided may be the same or different.

In the above embodiment, the case where the communication hole and the through hole are provided on both sides of the one end side shape retaining portion 31 and the other end side shape retaining portion 32 has been described as an example. It can also be provided on only one of the portion 31 and the other-end shape retaining portion 32.
Further, the through hole is not necessarily provided, and the same effect can be obtained by using only the communication hole.

  In the above embodiment, the communication hole and the through hole may be described by taking the communication hole 46 provided in the plug member 4 and the through hole 52 provided in the first tubular member 5 as examples. The same can be applied to the communication hole 87 provided in 8 and the through-hole 62 provided in the second cylindrical member 6.

  The fluid blocking bag according to the present invention can be used for blocking the fluid in the fluid conduit when constructing a middle portion of the fluid conduit such as a gas pipe or a water pipe.

The fragmentary sectional view which shows the expansion state of the bag for fluid interruption | blocking which concerns on this embodiment Side view of fluid blocking bag according to this embodiment The perspective view which shows the preparation procedures of the bag main body which concerns on this embodiment Explanatory drawing of the principal part of the fluid blocking bag according to the present embodiment Sectional drawing explaining the state which the one end side shape retaining part moved with respect to the bag main body in this embodiment External view showing the usage state of the fluid blocking bag according to the present embodiment The fragmentary sectional view which shows the use condition of the fluid interruption | blocking bag which concerns on this embodiment Sectional drawing explaining the position of the communicating hole of the plug member used in the present Example Sectional drawing which shows the plug member which concerns on another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag main body 10 Fluid blocking bag 4 Plug member 5 1st cylindrical member 6 2nd cylindrical member 8 Joint member 43 Projection part 44 Projection part 45 Projection part 46 Communication hole 52 Through hole 62 Through hole 84 Projection part 85 Projection part 86 Protrusion 87 Communication hole

Claims (7)

A bag body made of rubber or elastic synthetic resin and formed into a cylindrical shape; and a joint member for connecting the bag body and a fluid supply / discharge pipe for supplying and discharging a fluid to and from the bag body. The bag body is sealed by pinching one end of the bag body between a plug member inserted inside the one end and a first tubular member surrounding the outside of the one end. A fluid blocking bag that is sandwiched between the joint member inserted into the other end and a second cylindrical member surrounding the other end and sealed,
A fluid blocking bag in which a communication hole communicating with the inside of the bag body is provided in a portion of the outer peripheral surface of at least one member of the plug member and the joint member that is covered by the bag body.   2. The fluid blocking bag according to claim 1, wherein the part has at least one protrusion, and the communication hole is provided on the outer side in the longitudinal direction of the member than at least one of the protrusions.   The protrusions are annular protrusions that are provided over the entire circumference of the outer peripheral surface, and at least two or more protrusions are provided along the longitudinal direction of the member. The fluid blocking bag according to claim 2, wherein the fluid blocking bag is provided on the inner side in the longitudinal direction of the member than at least one of the portions.   The fluid blocking bag according to claim 1, wherein the part has at least one protrusion, and the communication hole is provided in at least one of the protrusions.   The fluid communication bag according to any one of claims 1 to 4, wherein a plurality of the communication holes are provided along a longitudinal direction of the member.   The through-hole which penetrates in the radial direction of the said cylindrical member is provided in the outer peripheral surface of at least one cylindrical member among the said 1st cylindrical member and the said 2nd cylindrical member. The fluid blocking bag according to claim 1.   The fluid blocking bag according to claim 6, wherein the through hole is provided on the outer side in the longitudinal direction of the cylindrical member with respect to the communication hole.

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