JPH0669593U - Fluid barrier bag - Google Patents

Abstract

(57) [Summary] [Purpose] When discharging the fluid in the bag, to reduce the diameter of the bag before expansion. [Structure] Bag body 1 made of rubber or elastic synthetic resin
Is made of a cylindrical material in an expanded state, and the bag body 1
Is folded so as to form a large number of folds in the circumferential direction over its entire length, and is formed in a state in which a large number of folds are wound in a spiral shape in a cross-sectional shape, and the winding shape of the folds is maintained. The shape-retaining portions 30 are provided at both ends of the bag body 1, and the shape-retaining portion 30 seals the bag body 1 on one side and connects the fluid supply / discharge pipe 2 to the inside of the bag body 1 on the other side. A spring 40 is provided inside the bag body 1 for urging the shape-retaining portions 30 of the fluid blocking bag so as to separate them from each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is mainly used for repairing the middle part of existing fluid conduits such as gas pipes and water pipes, and for temporarily disconnecting the internal fluid when connecting a new branch pipe to the middle part. It is used for plumbing work.It is contracted so that it can be inserted into and removed from the fluid conduit through the insertion hole formed by piercing the fluid conduit. The present invention relates to a fluid conduit blocking bag which can be changed to an inflated state in which the peripheral surface is elastically brought into close contact with the inner surface of the fluid conduit over the entire circumference. Specifically, the bag body made of rubber or elastic synthetic resin is in an inflated state. Made of a cylindrical material, the bag body is folded along its entire length so as to form a large number of folds in the circumferential direction, and formed in a state in which a large number of folds are wound in a cross-sectional shape in a spiral shape. Wrapping type of folds A shape-retaining portion for maintaining the above is provided at each of both ends of the bag body, and one side of the shape-retaining portion seals the bag body and the other side is connected to a fluid supply / discharge pipe for the inside of the bag body. It relates to a barrier bag.

[0002]

[Prior art]

 The conventional fluid conduit blocking bag maintains the elastic restoring force of the material and the pre-formed spiral folds and the winding shape of the folds when the bag is once expanded and then contracted again. The bag body is simply configured to be in a contracted state, relying on the bag body's curling by the shape retaining part.

[0003]

[Problems to be solved by the device]

 However, in the case of the conventional fluid blocking bag, the bag is folded in advance so as to form a large number of folds in the circumferential direction over the bag body, and the large number of folds are spirally wound in a cross-sectional shape. Although it is possible to smoothly insert the bag into the fluid conduit by forming it in the above, after filling the bag from the fluid conduit after the completion of the fluid blocking operation by the bag, the filled fluid is discharged from the inflated bag. Then, the bag is reduced in size and pulled out, but at that time, since it relied only on the resilience of the material of the bag body and the stiffness of the bag body, it may not restore as it was, so the bag was inserted. It is difficult to maintain the shape retention property at all times, and the diameter may not be reduced properly.If the diameter reduction is not performed properly, it is difficult to pull out from the hole drilled in the fluid conduit, and pulling forcefully. Any attempt to overtake there is a possibility that damage to the bag.

An object of the present invention is to allow the diameter of the bag to be favorably reduced in the state before expansion when the fluid in the bag is discharged.

[0005]

[Means for Solving the Problems]

 The characteristic structure of the bag for shutting off the fluid conduit of the present invention is that springs for urging the shape retaining parts at both ends of the bag are urged in the directions to separate them from each other inside the bag body. Is as follows.

[0006]

[Action]

 A spring is provided inside the bag body that exerts a biasing force in the direction that separates the shape retention parts at both ends of the bag while the fluid inside the bag body is being discharged. When the bag is inserted, the shape retaining parts at both ends of the bag are separated from each other by the biasing force of the spring inside the bag body. Therefore, the bag body is kept in a rod shape by maintaining a large number of folds formed by circumferentially folding the bag body in a spiral shape with a cross-sectional shape, so that the bag body is kept in a rod shape. Exhibits self-shape retention in the longitudinal direction.

When the bag for fluid shutoff is located at a predetermined position in the fluid conduit and the bag main body is filled with the fluid from the fluid supply / discharge pipe connected to the inside of the bag main body, the bag main body is expanded as the bag main body expands. Both ends of the bag body approach each other as the inner spring shrinks. The inflated bag body is inscribed in the fluid conduit, so that the fluid in the fluid conduit can be blocked at the position of the bag body.

[0008] Further, after the work of shutting off the fluid in the pipe by the bag is completed, the fluid in the bag body is exhausted so that the shape-retaining portions at both ends of the bag are separated from each other by the biasing force of the spring. Since the action of pulling and reducing the diameter of the bag body is exerted, the fluid inside the bag body is more positively discharged to the outside, so that the expanded bag body can be easily reduced to its original diameter. When the two shape-retaining parts are separated, the bag body is folded into a rod shape so as to form a large number of folds around the entire circumference.

[0009]

[Effect of device]

 Therefore, the bag can be securely and easily inserted into a predetermined position in the fluid conduit, and when the bag is removed from the fluid conduit after the work, the bag can be quickly evacuated. Since the bag can be easily withdrawn without damaging it, the workability for shutting off the fluid conduit can be improved.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 6, the bag 10 for shutting off the fluid conduit of the present invention is used for repair work such as repairing or replacing an intermediate part of the fluid conduit 7 such as a gas conduit over a certain length range. In addition, a perforation device 25 for performing perforation, blocking, and temporary connection shown in FIGS. 6 and 7 without blow was attached to the fluid conduit 7 near both ends of the construction section A, and provided in the perforation device 25. It is used when the fluid is hermetically blocked by inserting it into the fluid conduit 7 from an oblique direction through the oblique pipe 26. As shown in FIG. 2, the hard pipe 2 for supplying and discharging the fluid is normally in a contracted state. By enclosing a gas such as air through the inside, the fluid expands as shown in FIG. 1 and its peripheral surface elastically adheres to the inner surface of the fluid conduit 7, thereby shutting the fluid conduit 7 airtightly and watertightly. Is configured.

To form the bag 10, as shown in FIGS. 1 to 5, the bag body 1 is made of a flexible rubberized cloth and is made of a cylindrical material in an expanded state. The folds 23 are provided so that the bag body 1 is folded along its entire length so as to form a large number of folds 23 in the circumferential direction, and a large number of folds 23 are wound in a transverse cross-section. The shape-preserving portions 30A and 30B for maintaining the winding shape of the bag body 1 seal the bag body 1 on one side of the bag body 1, and on the other side, the hard tube 2 for supplying and discharging fluid to the inside of the bag body 1 and the bag body. 1 and 1 via a flexible short pipe 28.

In order to seal one end of the bag body 1, a hard plug 4 and a first metal cylinder member 5 are provided, and a flexible short tube 28 is attached to the bag body 1 at the other end of the bag body 1. A second metal member 6 is provided for inserting the connecting pipe 3 for connection and for hermetically sealing the other end in cooperation with the connecting pipe 3.

That is, the structure of the connecting portion between the bag body 1 and the flexible short pipe 28 will be described. As shown in FIG. 1, the connecting pipe 3 made of a metal tube is provided in the other end of the bag body 1. While inserting the first inner cylinder portion 8, the rubber cylinder 9 and the second metal member 6 are covered on the outside of the end portion of the bag body 1, and the second metal cylinder member 6 is caulked by applying force from the outside. Thus, the second metal cylinder member 6 is deformed toward the first inner cylinder portion 8 side of the connecting pipe 3, and the end of the bag body 1 and the rubber cylinder 9 are moved to the second metal cylinder member 6 and the first inner cylinder portion 8. While being elastically sandwiched between the bag body 1 and the rubber tube 9, the bag body 1 and the rubber tube 9 are brought into close contact with the inner surface of the second metal tube member 6 and the outer surface of the first inner tube portion 8 to hermetically connect the connecting tube 3 to the bag body 1 Connected to.

On the outer peripheral surface of the first inner cylindrical portion 8 of the connecting pipe 3, a locking portion 11 is provided so as to project over the entire circumference, and is bent inward from the end of the second metal cylindrical member 6. The formed flange portion 13 is locked to the locking portion 11 of the connecting pipe 3.

Further, in the connection pipe 3, a second inner cylinder portion 17 is extended on the side opposite to the bag body 1, and the second inner cylinder portion 17 is made of a polyurethane flexible material in the same manner as described above. The flexible short tube 28 is inserted into the short tube 28, the first caulking tubular member 18 is externally fitted to the outer side of the flexible short tube 28, and then the first caulking tubular member 18 is caulked, whereby a flexible short tube is formed. The end portion of the pipe 28 is sandwiched between the second inner cylinder portion 17 and the first caulking member 18, and the flexible short pipe 28 is firmly connected to the connecting pipe 3 with good airtightness. .

The other end of the flexible short pipe 28 is connected to the hard pipe 3 made of steel by using a joint member 12. That is, the joint member 12 is screwed to one end of the hard pipe 3, and the other end of the short pipe 28 to which the second caulking tubular member 35 is fitted is inserted into the connecting tubular portion 12A of the joint member 12. The second caulking tubular member 35 is caulked to connect the short pipe 28 to the joint member 12.

On the other hand, at the other end of the bag body 1 as well, the metal stopper 4 is inserted into the bag body 1 from the end of the bag body 1 and the rubber tube 27 is attached to the bag body 1. The first metal tubular member 5 is covered with the first metal tubular member 5 that surrounds the outer periphery of the outer peripheral portion, and the first metal tubular member 5 is caulked to be sealed.

A coil-shaped spring 40 is attached to the inside of the bag body 1 from the tips of the connecting pipes 3 facing each other to the tip of the metal stopper 4 on the other end side. is there. The spring 40 biases the shape-retaining portions 30A and 30B in a direction in which they are separated from each other.

As shown in FIG. 3, the bag body 1 is formed by winding a rubberized cloth 21 formed by drawing rubber on a nylon base cloth 20 into a cylindrical shape, and stacking the end portions thereof with an adhesive agent. To form the cylindrical body 22.

The warp yarns of the base fabric 20 are arranged along the longitudinal direction of the tubular body 22, the weft yarns are arranged along the circumferential direction of the tubular body 22, and the warp yarns have less elongation than the weft yarns, and The pressure resistance of the bag body 1 is increased by using fibers having high tensile strength. Then, as shown in FIG. 4, the tubular body 22 is folded so as to form a large number of folds 23 in the circumferential direction over the entire length thereof, and further, as shown in FIG. Roll in one direction to form a spiral. Thereafter, as described above, the stopper 4 is inserted into one end of the bag body 1 in the folded and reduced diameter state, and the end of the bag body 1 is connected to the first metal tube member 5 via the rubber tube 27. While crimping, the connecting tube 3 is inserted into the other end of the bag body 1 and the end of the bag body 1 is crimped with the second metal tubular member 6 through the rubber tube 9 so that the folds of the folds 23 are swirled. The shape-retaining portion 30 for retaining the shape is formed. As shown in FIG. 1, both ends of the spring 40 are fixed by externally fitting the ends of the stopper 4 and the connecting pipe 3 in the bag body. With this arrangement, the shape-retaining portions 30A and 30B on both ends are moved away from each other and the fluid conduit blocking bag 10 has the large number of folds 23 and the shape-retaining portion 30A in a state where the fluid is not enclosed in the bag body 1. , 30B helps to keep the shape in a rod shape, and for example, even if one end of the fluid conduit blocking bag 10 is held by hand, the other end does not bend downward due to its own weight. In addition, as the diameter of the bag body 1 expands when a fluid is enclosed, the large number of folded folds 23 are pulled to form a cylindrical shape. Then, when the enclosed fluid is discharged again, the folds of the springs 40 fold the plurality of folds 23, and the bag body 1 is kept in a state before the fluid is enclosed, that is, in a rod shape. It becomes a state.

The first metal cylinder member 5 and the second metal cylinder member 6 are each formed of a steel material that can be plastically deformed under a set load, and the polyurethane flexible short tube 28 is made of a soft material. When a nylon tube 41 is installed inside the flexible short tube 28 and the hard tube 2 is gripped and the bag body 1 is pushed into the fluid conduit 7 from the slant tube 26, the pushing force and the pushing force are used. It is constructed so that directions can be efficiently transmitted.

Next, a description will be given of the case where the fluid conduit blocking bag 10 configured as described above is inserted into the gas conduit 7 as a fluid conduit to seal the gas conduit 7. The perforation device 25 is attached to the gas conduit 7 and one hole 24 is perforated, and the oblique pipe 26 attached to the perforation device 25 and the hole 24 while pushing the rigid pipe 2 in a straight line in an oblique direction. Through, the fluid conduit blocking bag 10 in a contracted rod state is inserted toward the gas conduit 7 and brought into contact with the inner surface of the gas conduit 7 to slide to reach a deep position of the gas conduit 7. Guide the bag 10.

At this time, the flexible short tube 28 bends while transmitting the pushing force from the hard tube 2 to change the relative posture between the bag body 1 and the hard tube 2. The main body 1 is in a posture substantially along the gas conduit 7, and can easily enter the deep position of the gas conduit 7.

Next, by enclosing a gas such as air in the fluid conduit blocking bag 10 through the hard tube 2 and the short tube 28, the portion of the fold 23 is expanded and inflated, and the fluid conduit blocking bag 10 The outer peripheral surface is brought into close contact with the inner surface of the gas conduit 7 to block the gas passage in the gas conduit 7. At this time, due to the expansion of the bag body, the shape-retaining portions 30A and 30B on both end sides of the bag approach each other against the biasing force of the spring 40, and the spring 40 in the bag body 1 is compressed.

After the work is completed, first, the gas such as the air enclosed in the fluid conduit blocking bag 10 located at the sealing position inside the gas conduit 7 can be discharged from the hard pipe 2 and the short pipe 28. Then, the bag body 1 is reduced in diameter as the gas is discharged, and the shape-retaining portions 30A and 30B are moved away from each other by the biasing force of the spring 40 in the bag body 1, and as a result, the bag body 1 The discharge of the gas is promoted, and accordingly, the bag body 1 is refolded at the portion of the folds 23, and the bag body 1 is kept in the rod state as before the gas was filled.

The bag 10 for blocking the fluid conduit in the rod state again is extracted from the gas conduit 7 through the hole 24 drilled in the gas conduit 7 and the oblique pipe 26 attached to the drilling device. At this time, since the bag body 1 has improved rod-like shape retention due to the urging force of the spring 40, the bag body 1 is hooked on the hole 24 or the oblique pipe 26 attached to the punching device. There is no risk of damage.

[Other Embodiment] Another embodiment of the present invention will be described below.

Inside the bag body 1 of the fluid conduit blocking bag 10, a plug 4 inserted into one end of the bag body 1 and a connecting pipe 3 in the other end of the bag body 1 are connected to each other. As shown in FIGS. 9 and 10, in order to help the body 1 to be shaped like a rod, a plate having a length sufficient to keep the shape-retaining portions 30A and 30B on both ends of the bag body 1 away from each other. Two springs 43 are attached so that they face each other. The leaf springs 43 are bent so as to be rod-shaped so as to face each other. Both ends of the leaf spring 43 are fixed along the outer periphery of the end of the stopper 4 and the end of the connecting pipe 3 in the bag body.

With this configuration, as shown in FIG. 8, the shape-retaining portions 30A and 30B on both end sides in the state where the fluid is not enclosed in the bag body 1 are the leaf springs 43 which are bent in a rod shape. And the leaf springs 43 are attached to each other, so that the fluid conduit blocking bag 10 is kept away from each other by the large number of folds 23 and the shape-retaining portions 30A and 30B to help retain the shape of the rod. Thus, for example, even if one end of the fluid conduit blocking bag 10 is held by hand, the other end does not bend downward due to its own weight. As the diameter of the bag body 1 expands, the large number of folded folds 23 are pulled to form a cylindrical shape, and the leaf springs 43 facing each other are brought close to the shape-retaining portions 30A and 30B. Curved and back Allow expansion of the diameter.

Then, when the enclosed fluid is discharged again, due to the restoring force of the leaf spring 43, the large number of folds 23 are folded and the bag body 1 is in a state before the fluid is enclosed, that is, a rod shape. The shape is retained.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an expanded state.

[Figure 2] Overall side view

FIG. 3 is a perspective view showing a method of manufacturing the bag body.

FIG. 4 is a perspective view showing a method for manufacturing the bag body.

FIG. 5 is a perspective view showing a method for manufacturing the bag body.

FIG. 6 is a side view showing a state in which a perforation device is attached to the gas conduit.

FIG. 7 is a partially cutaway side view of a perforation device attached to a gas conduit.

FIG. 8 is a partially cutaway overall side view showing another embodiment.

FIG. 9 is an overall side view showing another embodiment.

FIG. 10 is a cross-sectional view showing a main part of mounting a leaf spring.

[Explanation of symbols]

 1 Bag body 23 Folds 30A, 30B Shape retention part 40 Spring

Claims (1)

[Scope of utility model registration request] 1. A bag body (1) made of rubber or elastic synthetic resin is made of a cylindrical material in an expanded state, and the bag body (1) has a large number of folds (23) in the circumferential direction over the entire length thereof. And a large number of folds (23) having a cross-sectional shape and wound in a spiral shape.
Shape retaining part (30) for maintaining the winding shape of the folds (23)
Are provided at both ends of the bag body (1) to seal the bag body (1) at one side of the shape retaining part (30) and at the other side of the bag body (1).
A bag for fluid cutoff, in which a fluid supply / discharge pipe (2) for the inside is connected, wherein a spring (40) for urging the shape-retaining portions (30) away from each other is provided in the bag body (1). ) A bag for shutting off the fluid provided inside.