JP2002168391A - Bag for shutting off fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag for shutting off fluid capable of surely restoring a shape of a bag body. SOLUTION: A lot of folds are formed along an overall length in the circumferential direction of the bag main body 1, and the bag main body 1 keeps its foldable wound shape in a state of spirally winding the folds. There are provided a tip shape retaining portion 30A for sealing the bag main body 1, and a tubular base end shape retaining portion 30B which seals the bag main body 1 and to which a fluid supply/discharge pipe 2 is connected to form a flow passage communication to the inside of the bag main body 1. In the bag main body 1, a spring 42 capable of urging the shape retaining portions to be spaced from each other, and a rod 41 along the spring 42 are disposed. The base end shape retaining portion 30B has a ventilation mechanism for free ventilation between the fluid supply/discharge pipe 2 and the bag main body 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a bag body made of rubber or elastic synthetic resin which is in an inflated state and has a large number of folds formed in a circumferential direction over the entire length of the bag body, and traverses the bag body. A tip shape retaining portion for forming the plurality of folds in a spiral shape in a spiral shape so as to be foldable in a planar shape, maintaining a wrapped shape of the folds, and sealing the bag body on one end side of the bag body. In addition to the above, a tubular base-end retaining portion capable of forming a flow path to the inside of the bag body is provided on the other end side of the bag body while sealing the bag body and connecting a fluid supply / discharge pipe. The present invention relates to a fluid blocking bag.

In such a fluid shut-off bag, the gas pipe can be shut off temporarily as follows. A hole is drilled near a predetermined portion of the gas pipe by a drilling device, and a contracted rod-shaped fluid blocking bag is inserted into the gas pipe through the hole, and slides by contacting the inner surface of the gas pipe. While guiding, the bag is guided to a position deep in the gas pipe.

[0003] At this time, the vicinity of the base-end retaining portion of the fluid supply / discharge tube is bent while transmitting a pushing force to change the relative posture between the bag body and the fluid supply / discharge tube. 1 is in a posture substantially along the gas pipe and enters a position deep in the gas pipe.

Then, a gas such as air is sealed in the fluid conduit blocking bag through the fluid supply / discharge pipe, thereby expanding and inflating the fold portion, thereby forming an outer peripheral surface of the fluid blocking bag into a gas pipe. Close to the inner surface of the gas pipe to block the passage of gas through the gas pipe. The pipe line thus blocked from passing the gas is used for a predetermined operation such as extension of a branch pipe and lining in the pipe.

After the operation is completed, first, a gas such as air sealed in a fluid blocking bag at a sealing position inside the gas pipe can be discharged from the fluid supply / discharge pipe. The diameter of the bag body is reduced as the gas is discharged, and the folds of the bag body are folded again, and the bag body is restored to a rod-like body as before gas filling. The bag body restored to the rod-like body can be taken out of the gas pipe by pulling out the fluid supply / drain pipe from the hole, and the gas pipe can be restored by restoring the hole.

[0006]

2. Description of the Related Art Conventionally, as a fluid blocking bag of this type, as described in JP-A-63-130990,
It is known that the tip shape retaining portion and the proximal shape retaining portion are configured so that the bag body can be hermetically sealed by caulking between a hard stopper and a plastically deformable cylindrical member. The bag body can be made of a tubular elastic member that is extruded and seamless, so that when the bag body is inserted into a conduit and expanded, the expanded state is maintained well. It is known that it is easy to secure the sealing property for the fluid sealing and that the fluid blocking bag can be manufactured with high productivity.

[0007] According to such a fluid blocking bag, the shape of the bag body in the reduced diameter state is easily held in a straight line by the large number of folds formed over the entire length of the bag body. Although it has the characteristic of
When the diameter of the bag body once expanded is reduced, the folds may become an obstacle. Therefore, as described in Japanese Utility Model Laid-Open No. 6-69593, the folds are attached in a direction to separate the two retaining portions. A structure is provided in which an energizable spring body is provided inside the bag body to improve the shape restoring property of the bag body.

[0008]

However, even with such a structure, in particular, the fluid shut-off bag is formed such that the bag body is formed to be long in order to seal a large-diameter pipe. In this case, since the spring body itself is bent, the shape restoration property is not sufficiently obtained, and when the bag body is pulled out from the pipeline, the bag body may be caught and damaged by the bag insertion hole provided in the pipeline. However, there is a problem that it is difficult to solve the problem sufficiently, and a similar problem does not depend on the diameter of the pipeline,
More or less has occurred.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fluid shut-off bag which can more reliably exhibit the shape restoring property of the bag main body in view of the above situation.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a fluid blocking bag according to the present invention is characterized in that the bag is made of rubber or elastic synthetic resin which is in an inflated state and cylindrical. A main body is provided, a large number of folds are formed in the circumferential direction over the entire length of the bag body, and the large number of folds are formed in a cross-sectional shape so as to be foldable in a spirally wound state. While maintaining the wrapped shape, a tip shape retaining portion for sealing the bag body is provided at one end side of the bag body, and the bag body is sealed and a fluid supply / drain pipe is connected to the other end side of the bag body. A fluid blocking bag provided with a tubular base-end retaining portion capable of forming a flow path to the inside of the bag body, wherein the spring body is capable of being biased in a direction for separating the two retaining portions. And an elastic member having shape retention And a rod-shaped body along the spring body, while holding the distal end of the rod-shaped body in the distal end shape retaining part, and inserting the other end of the rod-shaped body through the base end shape retaining part, and The fluid supply / discharge pipe and the bag body are provided in the bag main body in a state where the fluid supply / discharge pipe is slidably held by the fluid supply / discharge pipe in accordance with the approach and separation of the two retaining sections. In that a ventilation mechanism is provided to allow air to pass between them.

According to a second aspect of the present invention, in the above configuration, the spring body is a coil spring capable of holding the rod-shaped member in an inserted state, and the coil spring is provided at the base end of the rod-shaped member. In addition to providing a retaining portion for retaining from the body, a retaining member that is loosely fitted to the rod-shaped body and engages with the base end shape retaining portion is provided to prevent close contact between the retaining portion and the coil spring. It is preferable that the ventilation mechanism is formed by forming a ventilation part between the rod-shaped body and the retaining part, while allowing the rod-shaped body to slide in the base end shape retaining part,

Further, in the above construction, the spring body and the rod-shaped body are integrally formed to form a core body, and the core body can be inserted into the tip shape retaining portion. Preferably, a threaded portion is formed between the distal end portion of the core body and the insertion hole so that the gas bag can be hermetically sealed. At this time, further, as described in claim 4, at the tip end of the core body, a cover that is detachably screwed to the rod-shaped body is provided, and a screwing part is formed between the lid and the insertion hole. Preferably.

[Operation and Effect] In other words, if a spring body capable of biasing in a direction for separating the two retaining portions is provided inside the bag body, the spring body is withdrawn when gas is extracted from the bag body. The urging member is biased in a direction to separate the two retaining portions from each other to help restore the bag body to its original linear shape, so that a more reliable shape restoring property is obtained. At this time, the rod-shaped body made of an elastic member having shape-retaining property and holding the tip of the rod-shaped body at the tip-shaped retaining part while holding the distal end of the rod-shaped body along the spring body, and attaching the other end of the rod-shaped body to the The spring body may be inserted into the bag body and provided in the bag main body in a state of being slidably held by the fluid supply / drain pipe with the approach and separation of the two shape holding sections. Is biased in a direction along the rod-shaped body in a direction to separate the two holding parts, so that it is easy to maintain a posture that is linear and easily applies an urging force to the two holding parts. Therefore, the spring body can more reliably urge the two retaining portions in the separating direction, and can easily restore the bag body to a linear shape. At this time,
When the two shape-retaining portions move close to each other, the distance between the two shape-retaining portions becomes shorter than the length of the rod-shaped body. Since the portion slides in the base holding portion, it does not hinder the approaching / separating operation of the both holding portions, and guides the fluid supply / drainage pipe so that the movement can be performed while being restricted in the axial direction. .
Accordingly, it is possible to prevent the rod-shaped body from hindering the deformation of the bag main body, and to prevent the bag main body from expanding and contracting in an irregular shape. Here, at the time of expanding the diameter of the bag body, the base end of the rod-like body enters the inside of the fluid supply / drain pipe, and the spring body is in the action posture with respect to the base end retaining section. ,
A member that tends to close the flow path will be densely arranged in the base end shape retaining portion, but the base end shape retaining portion is ventilated between the fluid supply / discharge pipe and the bag body. Since a ventilation mechanism is provided to allow free air, air is supplied from the fluid supply / discharge pipe to the bag body and exhausted from the bag body through the fluid supply / discharge pipe is performed quickly, and the shape of the bag body can be changed quickly and reliably. Can be encouraged. As a result,
Comfortable operability when inserting and removing the bag body from the pipeline,
Safe workability that does not easily damage the bag body is obtained.

Specifically, in the above structure, the spring body is a coil spring capable of holding the rod in a state of being inserted, and the coil spring is prevented from coming off from the rod at a base end of the rod. In addition to providing a retaining portion, a retaining member that is loosely fitted to the rod-shaped body and that engages with the base-end shape retaining portion is provided to prevent close contact between the retaining portion and the coil spring. If the venting mechanism is formed by forming a ventilation part between the stopper and the retaining part while allowing the sliding movement in the proximal end shape retaining part, the proximal end of the rod-shaped body is the fluid It can be configured to reliably secure a ventilation path between the retaining portion and the inner wall of the fluid supply / discharge pipe while sliding in the supply / discharge pipe, and in the base-end retaining section, the rod-shaped body has Because the holding member is loosely fitted, Between the holding member and the rod-shaped body, an air passage that facilitates ventilation is formed, and the air passage is communicated with the ventilation portion, and an air passage that extends to the inside of the coil spring is formed. Because
As a result, a ventilation path from the fluid supply / discharge pipe to the bag body can be reliably ensured. Note that when the holding member is engaged with the base shape retaining portion, it is not only when the holding member is fitted and held in the ventilation path of the base shape holding portion, but also when the holding member is simply abutted and held. Even in such a case, the state includes a state in which the holding member is in a state where the relative position with respect to the base end shape retaining portion can be held.

Further, in the above structure, if the spring body and the rod-shaped body are integrally formed to form a core,
Since the core body is easily formed as a whole, it can be mounted inside the bag main body in a state where the relative position between the spring body and the rod-shaped body is determined, so that the spring is more reliably provided. It is possible to assemble the fluid blocking bag in a state where the body and the rod-shaped body are likely to cooperate. Here, when it is referred to as “integrally formed”, not only when the spring body is fixed to the rod-shaped body,
As in the above-described configuration, even in a state in which the coil spring is provided on the rod-shaped body in an externally fitted state, if the coil spring is inseparably retained from each other and is formed in a state that must be handled integrally. It is considered to be "integrally formed".

When assembling the fluid blocking bag, if the insertion hole through which the core body can be inserted is formed in the tip shape-retaining portion, the fluid supply / drain pipe can be connected to the bag body. Since the core can be attached and detached in a state in which the cores are connected, the replacement of the core can be easily performed at a work site according to the situation. In addition, when performing such attachment / detachment operation from the distal end side, it is necessary to securely hold the distal end portion of the rod-shaped body at the distal end side of the core body, as compared with the case of performing from the proximal end side. On the other hand, since the base end of the rod-shaped member only needs to be inserted into the fluid supply / drain pipe, the assembling operation can be performed while directly checking a portion requiring more reliable assembling, and the reliability of the operation is reduced. Easy to be guaranteed. Further, when the attachment / detachment operation is performed from the base end side, in order to easily connect the fluid supply / drainage pipe to the base end holding section, the connecting section is formed on the base end holding section. Is preferable, it is also possible to avoid a situation in which the connecting portion obstructs the assembly work.

Further, when adopting a configuration in which the core is assembled from the tip shape-holding portion side of the bag body, the tip of the core and the insertion hole are screwed with each other to form the gas bag. By providing a threaded portion that makes it possible to hermetically seal the bag, it is easy to simultaneously and reliably realize the secure fixing of the core body and the secure sealing of the inside of the bag body. At this time, if the core is further provided with a lid that can be screwed on and removed from the rod-shaped body at the tip, the spring body may be damaged or deteriorated, and the core may be damaged. When it is necessary to disassemble and replace the spring body, when the lid is separated from the rod-like body, the spring body can be easily pulled out and separated from the rod-like body. This is preferable because maintenance can be easily performed. Further, since the length of the core body can be changed by changing the screwing depth of the lid and the rod-shaped body, for example, when the bag body is made of a rubber material, the manufacturing dimensions of the rubber material are reduced. When there is an error or when the rubber material is stretched by repeated use, the size of the core material is adjusted in accordance with the size, and the urging force by which the spring material urges both the retaining portions of the bag body is increased. It is easy to adjust to make sure it works. Thereby, more reliable shape restoration of the bag body can be expected. It is preferable that a screw portion is formed between the lid portion and the insertion hole, because even if such a configuration is adopted, the above-described configuration that is easy to assemble is not damaged.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 6 and 7, the fluid blocking bag 10 of the present invention extends over a certain length range of a fluid supply pipe (eg, a gas pipe) 7 such as a gas pipe. 6 and 7 in the gas pipe 7 near both ends of the work section A when performing a repair work such as repair or replacement by a non-blowing method. 25, which is used to insert gas into the gas pipe 7 from an oblique direction through a diagonal pipe 26 provided in the perforation apparatus 25 to block the gas tightly. As shown in FIG. By enclosing a gas such as air inside the hard pipe 2 for fluid supply / discharge, it expands as shown in FIG. 1 so that the peripheral surface thereof elastically adheres to the inner surface of the gas pipe 7, and 7
Is configured to be airtightly shut off. Further, inside the bag body 1, there is provided a core body 40 integrally formed such that a coil spring 42 as a spring body is externally fitted and held on a piano wire 41 as a rod-shaped body.

As shown in FIG. 3 (a), the bag body 1 is formed by winding a rubber cloth 21 formed by pulling a rubber on a nylon base cloth 20 into a cylindrical shape. To form a cylindrical body 22. In addition, the warp of the base fabric 20 is arranged along the longitudinal direction of the tubular body 22, the weft is arranged along the circumferential direction of the tubular body 22, and the warp has less elongation and tensile strength than the weft. The pressure resistance of the bag body 1 is increased by using a fiber having a large size.

As shown in FIGS. 3 (a) to 3 (c), the bag 10 is made of a rubberized cloth having flexibility and formed of a cylindrical material in an inflated state. The main body 1 is provided, and the bag main body 1 is folded so as to form a large number of folds 23 in the circumferential direction over the entire length thereof, and formed in a state in which a large number of folds 23 are spirally wound in a cross-sectional shape. 1 and 2, the tip shape retaining portion 3 for maintaining the wound shape of the fold 23 as shown in FIGS.
0A, a base end retaining portion 30B is provided to seal the bag main body 1 at the distal end of the bag main body 1 and to make the rigid fluid supply / discharge pipe 2 and the bag main body 1 inside the bag main body 1 flexible at the base end. It is connected through a short pipe 28.

That is, as shown in FIG. 3B, the cylindrical body 22 is folded over the entire length thereof so as to form a large number of folds 23 in the circumferential direction, and further, as shown in FIG. Each of the folds 23 is wound in one direction so as to have a spiral cross section. Thereafter, as described above, the stopper 4 is inserted into one end of the bag body 1 in a state where the bag body 1 is folded and reduced in diameter, and the end of the bag body 1 is swaged with the first metal cylinder member 5 to hold the tip. While forming the shape part 30A, while inserting the inner cylinder part 8 into the other end part of the bag main body 1, the end part of the bag main body 1 is caulked with the second metal cylinder member 6, and the fold 2
The base shape retaining portion 30B for maintaining the spiral state of No. 3 is formed.

To seal the front end of the bag body 1 formed in a rubber cylindrical shape, as shown in FIGS. 1, 4 and 5,
An inner cylindrical portion for connecting the flexible short tube 28 to the bag main body 1 at the base end of the bag main body 1 is provided at the base end portion of the bag main body 1 while including the hard plug 4 and the first metal cylindrical member 5. 8
And a second metal member 6 for hermetically sealing the base end portion in cooperation with the inner cylindrical portion 8 to provide a base end retaining portion 30B.

As shown in FIGS. 1 and 4, the tip-shape retaining portion 30A covers a hard plug 4 with a rubber tubular bag body 1 and a first metallic tubular member 5 in this order. The first metal tube member 5 is deformed toward the stopper 4 by applying a force to the member 5 from the outside, and the end of the rubber tube-shaped bag body 1 is connected to the stopper 4 and the first metal tube. The bag body 1 is elastically sandwiched between the member 5 and the bag body 1 is brought into close contact and hermetically sealed. The plug 4 is provided with an insertion hole 9 that penetrates in the axial direction of the bag body while being crimped to the bag body 1.
A cover 43 serving as an element constituting the core body 40 is screwed together with the spring body 42 so that the inside of the bag body can be hermetically sealed.

As shown in FIGS. 1, 4 and 5, the base end retaining portion 30B has an inner cylindrical portion 8 made of a metal tube inserted into the other end of the bag main body 1, and the bag main body 1 has The rubber body of the bag body 1 and the second metal member 6 are sequentially covered on the outer side of the end of the first metal member, and the second metal cylinder member 6 is crimped by applying a force from the outside to thereby secure the second metal cylinder member 6 to the inner side. Tube part 8
Side, the end of the bag body 1 is elastically sandwiched between the second metal cylinder member 6 and the inner cylinder section 8, and the rubber cylinder-shaped bag body 1 is And the outer surface of the inner cylinder portion 8 is tightly connected to the bag body 1 in an airtight manner.

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

Further, the inner cylindrical portion 8 extends also on the side opposite to the bag body 1, and the inner cylindrical portion 8 is formed in the same manner as described above.
Is inserted into a flexible short tube 28 made of polyurethane, polyethylene, nylon, or the like, and the caulking tubular member 18 is externally fitted and caulked, and the connection is made airtight and firmly. It is.

The other end of the flexible short pipe 28 is connected to the hard pipe 2 made of steel using the joint member 12 to form a fluid supply / discharge pipe together with the flexible short pipe 28 and the like. I do. That is, the joint member 12 is screwed to one end of the hard tube 2, the flexible short tube 28 is fitted to a tubular portion formed at the end of the joint member 12, and the crimping tubular member 35 is fitted. Is externally fitted and caulked,
A short pipe 28 is connected to the joint member 12.

[0028] The core body 40 is made of a double-sided holding portion 30A, 30B.
The spring body 42 which can be urged in a direction to separate them from each other,
The rod-shaped body 41 is constituted by a coil spring as an elastic member having a shape retaining property capable of holding the rod-shaped body 41 in an inserted state along the spring body 42, and the coil spring is provided at the base end of the rod-shaped body 41. A large-diameter portion 41a is provided as a retaining portion for preventing the retaining member from coming off, and ring-shaped holding members 44, 45 which are loosely fitted to the rod-shaped body 41 and engage with the base-end retaining portion 30B are provided. The large diameter portion 41a
To prevent the rod body 41 from sliding close to the spring body 42 and allow the rod-shaped body 41 to slide in the base-end shape retaining portion 30B, and form a ventilation portion 46 between the large-diameter portion 41a. The ventilation mechanism is configured. Also, in this state,
The proximal end side of the rod-shaped body 41 is inserted into the proximal end shape retaining portion 30B, and the flexible shortage of the fluid supply / discharge tube 2 is caused by the close proximity of the two retaining shapes 30A, 30B. It is slidably held inside the tube 28.

As shown in FIG. 5, the holding members 44 and 45 are inserted into the inside of the bag main body 1 and the base ends of the inner cylindrical portion 8 and the converging end of the bag main body 1 and the like. It is configured to be able to contact and engage a part of the shape retaining portion 30B,
A main holding member 44, which is loosely fitted to the rod 41 and forms a ventilation portion 46 with the rod 41, is interposed between the main holding member 44 and the large diameter portion 41a, It is composed of a leaf spring member 45 for securing an air passage between the large diameter portion 41a and the main holding member 44 (see FIG. 5 (a)). It is composed of a plate-like body on which a number of ribs are formed (FIG. 5).
(B)), the large diameter portion 41a and the main holding member 4
4 and between the inner tubular portion 8 and the main holding member 44, between the flexible short tube 28 side and the bag body 1 side, and the main holding member. 4
The configuration is such that a ventilation path 46 can be ensured between 4 and the rod state 41.

At the tip of the core 40, a cover 43 is provided which can be screwed on and removed from the rod 41, and the cover 4
3 is provided with a threaded portion 43a to be inserted into the insertion hole 9. Thereby, the spring body 42 and the rod-shaped body 41 are integrally formed, and the front end of the core body 40 is
A is removably fixed to the insertion hole 9 formed in the plug 4 of FIG. An O-ring 47 is interposed in the screw portion 43a in order to obtain more reliable sealing.
In addition, a cap 48 is provided on the tip shape retaining portion 30A so as to facilitate sliding with the inner surface of the gas conduit and facilitate insertion and removal through the insertion hole of the bag body 1.

When manufacturing the fluid blocking bag, after the connection between the bag body 1 and the fluid supply / discharge pipe 2 and the molding of both the retaining sections 30A and 30B, the tip retaining section is formed. The core body 40 is inserted through the insertion hole 9 of the portion 30A, and the main holding member 44 is engaged and fixed to the base end retaining portion 30B while the large-diameter portion 41a is inserted into the inner cylindrical portion 8. Then, the tip shape retaining portion 30A is screwed and fixed so as to hermetically seal it. Thus, manufacturing and assembling with the length of the core body 40, the elastic strength of the spring body 42, and the like optimized can be reliably performed.

When the fluid blocking bag 10 is inserted into the gas pipe 7 to seal the gas conduit 7, the perforation device 25 is attached to the gas conduit 7 near a predetermined location to form one hole 24. While being pierced and pushing the rigid tube 2 in a straight line in an oblique direction, the bag 10 for blocking a fluid conduit in a contracted rod is passed through the oblique tube 26 attached to the piercing device 25 and the hole 24, and Insert into the conduit 7,
While sliding in contact with the inner surface of the gas conduit 7, it is guided to a deep position in the gas conduit 7.

At this time, the flexible short tube 28
In order to bend while transmitting the pushing force from the hard tube 2 and change the relative posture between the bag main body 1 and the hard tube 2, the bag main body 1 is brought into a posture substantially along the gas conduit 7, and It becomes easier to enter deeper positions.

Next, a gas such as air is sealed in the fluid conduit blocking bag 10 through the hard pipe 2 and the short pipe 28, thereby expanding and inflating the fold 23, thereby forming 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 passage of gas in the gas conduit 7. At this time, the spring 40
Shape retaining portions 30 at both ends of the bag against the urging force of
A and 30B approach each other, and the spring 40 in the bag body 1 is compressed.

After the operation is completed, first, gas such as air sealed in the fluid conduit shut-off bag 10 at the sealed position inside the gas conduit 7 can be discharged from the hard pipe 2 and the short pipe 28. The bag body 1 is reduced in diameter with the discharge of the gas, and the urging force of the spring 40 in the bag body 1 causes the two retaining portions 30A, 30B to move away from each other. The discharge is promoted, and accordingly, the bag body 1 is folded again at the fold 23, and is kept in a rod-like body as before the gas filling.

The fluid blocking bag 10 which has again become a rod-like body
Is extracted from the gas conduit 7 through a hole 24 formed in the gas conduit 7 and a diagonal tube 26 attached to the drilling device. At this time, the shape of the bag main body 1 is improved by the urging force of the spring 40, and the shape of the bag body 1 is improved.
There is no danger of the bag body 1 being hooked or damaged by the swash tube 26 or the like attached to the punching device.

[Alternative Embodiment] Although a coil spring is used as the spring body, a leaf spring may be used.
Further, although the piano wire is used as the rod-shaped body, a highly elastic resin wire, a metal wire, or the like can be used as an alternative.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing a working posture in a use state of a fluid blocking bag of the present invention.

FIG. 2 is a side view of the fluid blocking bag of the present invention.

FIG. 3 is a perspective view showing a procedure for manufacturing the bag body.

FIG. 4 is an explanatory view of a main part of a fluid blocking bag.

FIG. 5 is a vertical sectional side view of a ventilation section.

FIG. 6 is an external view showing a use state of the fluid blocking bag of the present invention.

FIG. 7 is an external view showing an operation posture in a use state of the fluid blocking bag of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag main body 2 Fluid supply / discharge pipe 23 Fold 30A Tip-retaining part 30B Base-retaining part 41 Rod 42 Spring body 46 Ventilation mechanism

Continued on the front page. (72) Keizo Iwao 5-11-11, Torishima, Konohana-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Junichi Kuraya 5-1-161 Torishima, Konohana-ku, Osaka-shi, Osaka Osaka Inside Gas Co., Ltd. (72) Inventor Akira Kamide 7-6, Bashizashi-cho, Tennoji-ku, Osaka-shi, Osaka In-house Osaka Waterproof Construction Co., Ltd. Osaka Waterproofing Construction Co., Ltd. (72) Inventor Koichiro Tsuruoka 7-6, Baizashi-cho, Tennoji-ku, Osaka-shi, Osaka Co., Ltd. Company Tokawa Gomuuchi (72) Inventor Hiroaki Matsushima 29 Higashikawahara, Awa-cho, Awa-gun, Tokushima Prefecture F-term 3H025 DA02 DB18 DC02 DD01

Claims (4)

[Claims] 1. A bag body made of rubber or elastic synthetic resin having a cylindrical shape in an inflated state is provided, a plurality of folds are formed in a circumferential direction over the entire length of the bag body, and the plurality of folds are formed in a cross-sectional shape. The folds are formed so as to be foldable in a spirally wound state, the wrapped shape of the folds is maintained, and a tip retaining portion for sealing the bag body is provided at one end of the bag body, and the bag body is provided. A fluid blocking bag provided with a tubular base-end retaining portion capable of forming a flow path to the inside of the bag body by sealing the bag body and connecting a fluid supply / discharge pipe to the other end of the bag. A spring body that can be urged in a direction to separate the two shape-retaining portions from each other, and a rod-shaped body made of an elastic member having shape-retaining properties, and a rod-shaped body along the spring body, The rod is held at the tip shape retaining portion and The other end of the body is provided inside the bag main body in a state of being inserted into the base shape retaining portion, and slidably held by the fluid supply / drain pipe with the approach and separation of the two shape retaining portions. A fluid blocking bag, wherein the base end retaining portion is provided with a ventilation mechanism for allowing ventilation between the fluid supply / discharge tube and the bag body. 2. The device according to claim 1, wherein the spring body is a coil spring capable of holding the rod body in an inserted state, and a stopper for preventing the coil spring from coming off the rod body at a base end of the rod body. A holding member that is loosely fitted to the rod-shaped body and that engages with the base-end shape retaining portion is provided to prevent close contact between the retaining portion and the coil spring. 2. The fluid blocking bag according to claim 1, wherein a ventilation portion is formed between the retaining portion and the retaining portion while allowing the sliding movement. 3. The core body is formed by integrally forming the spring body and the rod-shaped body to form a core body, and an insertion hole through which the core body can be inserted is formed in the tip shape retaining portion. The fluid blocking bag according to any one of claims 1 to 2, wherein a threaded portion which is screwed to each other to make the gas bag freely sealable is provided at a distal end portion of the fluid passage and the insertion hole. 4. The cover according to claim 3, wherein a lid is provided at the tip end of the core so as to be screwably attached to and detachable from the rod-shaped body, and the lid is formed with a threaded portion to the insertion hole. Fluid blocking bag.