JPH11153285A - Bag for shutting off piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely shut off the distribution of the fluid in a piping without any facility on a large scale so as to obtain the close contact condition with an inner circumferential surface of the piping. SOLUTION: A bag 3 for shutting off a piping to be used to seal fluid in the piping is provided with a bag body 3A comprising an elastic bag body inflatable and shrinkage through charge/discharge of gas, the bag body 3A is of approximately rectangular section having a longer side in a direction orthogonal to the installation direction of the piping, and the shape is kept by a suspended strip 7 integrated with surfaces 3A1 opposite to each other in the installation direction of the piping and stretched thereover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line blocking bag used for sealing a fluid in a pipe, and more particularly to a gas blocking bag for blocking gas flowing through a pipe. It is.

[0002]

2. Description of the Related Art City gas produced from a gas generating plant is supplied to customers via a large-diameter high-pressure line, a medium-diameter medium-pressure line, a small-diameter low-pressure line, and a supply pipe. In recent years, pipeline maintenance of each line has been performed in preparation for a disaster such as a large earthquake. When performing such pipeline maintenance, the gas in the maintenance target area is usually shut off, and replacement of the pipeline or rehabilitation repair is performed. When shutting off the gas, the shutoff valve provided in the pipeline is closed beforehand, or an airbag (balloon) is introduced into the pipeline and inflated in the pipeline to block the gas flowing through the pipeline. Is used.

[0003]

When the above-mentioned high-pressure line is maintained, the high-pressure line is usually provided with a shut-off valve, and this valve is closed. Cannot be shut off and there is some leakage. Therefore, when performing maintenance on the high-pressure line, it is necessary to completely shut off this leaked gas. However, it is difficult to open a hole for introducing an airbag into the high-pressure line in order to shut off leakage gas. Therefore, it is conceivable to introduce a bag from the opening of the diffusion valve communicating with the high-pressure line, but this opening is very small in diameter with respect to the diameter of the high-pressure pipe, and is used for a large-diameter high-pressure line. It was difficult to introduce a bag large enough to block the pipeline. In addition, when a bag is used, unless a considerable high pressure is used to inflate the bag, the contact area with the inner peripheral surface of the pipeline cannot be increased to secure the adhesion, and the gas cannot be inflated. There have been problems that the size of the device at the time of shutting down is increased and that reliability of the shutting down cannot be obtained.

The present invention has been proposed in order to cope with such a situation, and it is possible to reliably obtain a state of close contact with an inner peripheral surface of a pipeline without requiring a large-scale facility. An object of the present invention is to provide a pipeline blocking bag that can completely block the flow of fluid in a channel.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is a pipeline blocking bag used for sealing a fluid in a pipeline, and is provided with a gas inlet / outlet bag. A bag body made of an elastic bag body that can be inflated and contracted by the inflating and contracting deformation. When the bag body is inflated, the cross-sectional shape having a long side in a direction perpendicular to the laying direction of the pipeline is substantially rectangular. It is characterized by that.

According to a second aspect of the present invention, there is provided the pipeline blocking bag according to the first aspect, wherein the bag body is integrated and stretched at least on surfaces along a direction in which the pipeline is laid. It is characterized in that the amount of expansion in the laying direction of the pipeline is defined by the suspension band, and the hand cross-sectional shape is held substantially rectangular.

[0007] The invention described in claim 3 is claim 1 or 2.
In the bag for line blocking according to the above, the bag body is:
The surface facing the inner peripheral surface of the conduit has a higher coefficient of friction than the other surfaces.

According to a fourth aspect of the present invention, in the pipe line blocking bag according to any one of the first to third aspects, the bag body has one surface integrated with a pipe having a space that can communicate with the inside. When the pipe is used as a flagpole, the bag body is configured in a flag shape corresponding to a flag and is foldable.

According to a fifth aspect of the present invention, in the pipe line blocking bag according to the fourth aspect, the bag body communicates with the pipe so that the fluid flows upstream of the fluid flow direction in the pipeline. It is characterized in that a take-out part for external release is formed.

According to a sixth aspect of the present invention, in the pipe line blocking bag according to the fourth aspect, a hook corresponding to a binding portion is provided in a folded portion of the bag main body to maintain a folded state. It is characterized by:

[0011]

According to the first and second aspects of the present invention, when the bag is inflated, the bag body is formed to have a rectangular cross section so that the inflation in the pipe laying direction is suppressed and the inner circumferential surface of the pipe is reduced. Can prevent point contact, which makes contact unstable, so that the area of close contact with the inner peripheral surface of the conduit can be increased. In particular, according to the second aspect of the present invention, since the suspension band for restricting the expansion of the pipeline in the laying direction is provided, the pressure acting in the pipeline laying direction can be reliably applied to the peripheral surface side. Become. In addition, unlike the case of inflating in a balloon shape, the working pressure in the direction in which the pipeline is laid can be applied to the inside of the peripheral surface. Adhesion with the surface is ensured.

According to the third aspect of the present invention, since the coefficient of friction of the wind surface of the bag body is increased, even if the bag body is pushed and moved by the fluid pressure in the pipeline, the close contact is maintained without causing displacement. Can be maintained.

According to the inventions described in claims 4 to 6, since the bag body is formed in a flag shape together with the pipe and is foldable, the bag body can be inserted even into a narrow insertion portion. Moreover, the fluid pressure in the pipeline acting on the bag body can be reduced by discharging the fluid in the pipeline from the external discharge intake portion of the bag body to the outside. It is possible to prevent deterioration of the adhesion between the inner peripheral surface of the road and the road.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a main part configuration of a gas shut-off device intended for a gas line, which is one of the lines in which a line shut-off bag according to an embodiment of the present invention is used. A description will be given of the pipeline blocking bag according to the configuration.

In FIG. 1, the gas shut-off device 1 is 600 m
Communication hole 2 formed in conduit 2 having a large diameter of m
A, the first bag 3, the second bag 4 introduced from the inside of the communication hole 2A and blocking the gas inflow, and the bag storage box 5 and the bag storage box 5 for introducing these bags into the communication hole 2A. A base plate 6 for installation on the pipeline side is provided as a main part. It is assumed that the gas shut-off device 1 according to the present embodiment is attached to the diffusion valve 8 connected to the communication hole 2A of the conduit 2.

The structure of the first bag 3 is shown in FIG. In FIG. 2, the first bag 3 is a bag disposed in the conduit 2 on the upstream side in the gas flow direction (the direction indicated by the arrow F in FIG. 1), and is integrally attached to the bag body 3A. The bag body 3A is made up of an insertion tube 3B, and the bag body 3A is made up of a bag made of a rubberized nylon base fabric that can be expanded and contracted. Bag body 3A
Is provided with a shape-retaining structure when inflated, and the shape-retaining structure is a suspension band 7 using a rubberized nylon base cloth stretched between side surfaces 3A1 along the direction in which the gas conduit 2 is laid. It is constituted by. The hanging band 7 is shown in FIG.
As shown in FIG. 2, the side surface 3A1 of the bag body 3A is stretched in an octagonal shape and integrated with the inside of the side surface 3A1, and as shown in FIG. I have. In the present embodiment, as shown in FIG. 3, octagons having similar shapes on the side surface are arranged inside and outside, and a double side suspension structure is provided at each vertex between the side surfaces 3A1. As shown in FIG. 4, the bag body 3A is formed with a concave portion 3A2 whose central portion forms a passage penetrating the side surface 3A1, and gas inlets 3A3 are inserted at two locations in the diameter near the concave portion 3A2. Tube 3B
Are formed on the side surface (indicated by 3A1 'for convenience). In the present embodiment, the rubberized nylon base fabric constituting the bag body 3A is formed of a side surface 3A1 (reference numeral 3A1 'in FIG. 4).
In this case, the nylon fiber surface is located on the surface and the rubber is located on the peripheral surface, so that the coefficient of friction on the peripheral surface abutting the inner peripheral surface of the conduit 2 is increased. Have been.

As shown in FIGS. 4A and 4B, the insertion tube 3B comprises a metal flat pipe 3B1 and a small diameter round pipe 3B2 inserted into the flat pipe 3B1. The flat pipe 3B1 has its radius of curvature of the outer peripheral surface of the long diameter portion matched to that of the communication hole 2A to suppress deformation at the time of contact with the surface. The flat pipe 3B1 is formed with openings 3B1A and 3B1B communicating with the recess 3A2 of the bag body 3A and the gas inlet 3A3. Of these openings, the opening 3B1A corresponding to the recess 3A2 is formed by the conduit 2
The opening 3B1B is inserted into the bag body 3 through which the gas discharge portion 3B2A extended from the round pipe 3B2 is inserted.
A is connected to the inside of the bag body 3A through the gas inlet 3A3 of A. The recess 3A2 of the bag body 3A and the gas inlet 3A with respect to the openings 3B1A and 3B1B.
By integrating the three, the bag body 3A and the insertion tube 3B in a contracted state are formed in a flag shape. That is, the insertion tube 3B corresponds to a flagpole, and the bag body 3A corresponds to a flag.

In the first bag 3 having the above structure, gas such as carbon dioxide gas flows from the round pipe 3B2 of the insertion tube 3B.
A is expanded by being introduced into the inside through the gas inlet 3A3 of A, and the expanded shape becomes a substantially rectangular shape except for the concave portion 3A2. In addition, when the gas is evacuated from the inside, it can be contracted and folded. For this reason, the bag body 3A is provided with a hook (not shown) at a position on the outer surface which is folded and overlapped as a binding portion when folded.

The expansion of the first bag 3 in the laying direction of the conduit 2 is restricted by the suspension band 7 (see FIG. 2) stretched between the side surfaces 3A1 and 3A1 '. Is used for radial expansion, which makes it easier to press the peripheral surface against the inner peripheral surface of the conduit 2 and also prevents point contact with the inner peripheral surface.

As shown in FIG. 9, the second bag 4 is disposed behind the first bag 3 in the gas flow direction (the direction indicated by arrow F in FIG. 9) in the conduit 2. There is no concave portion 3A2 provided in the first bag 3, and a gas inlet (corresponding to a reference numeral 3A3 in FIG. 4) 4A in that portion.
1 is formed on the bag body 4A, and the other structure is the same as that of the first bag. The second bag 4 is integrated with an insertion tube 4B having a circular cross section also serving as a gas supply pipe, and a gas discharge portion 4B1 formed in the insertion tube 4B is inserted into the gas introduction port 4A1 to communicate with the inside of the insertion tube 4B. doing. Note that FIG.
Although not shown, the gas discharge portion 4B1 of the insertion tube 4B is also connected to the gas introduction port 4A1 of the second bag 4.
Is located.

The second bag 4 is also formed in the shape of a flag similarly to the first bag 3, and each of the bags 3, 4 has a size in a folded state inside the radiation valve 8 (see FIG. 1). Is designed to be large enough to be inserted.

The bag storage box 5 communicates with the communication hole 2A of the conduit 2, and positions the first and second bags 3, 4 loaded therein with respect to the communication hole 2A, respectively. Used to insert into For this reason, as shown in FIG. 5, the bag storage box 5 has a base plate 6 rotatably supported by a bearing member 9 corresponding to a first base attached to a flange of the diffusion valve 8 (see FIG. 1).
It has. In FIG. 5, the base plate 6 is a plate member integral with a flange portion 6A corresponding to a second base having a shaft portion fitted on the inner peripheral surface of the bearing member 9, and includes a first base and a second base. Are rotatably provided by a ball bearing 10 disposed between the flange portion 6A and the bearing member 9 corresponding to the above. As shown in FIGS. 6 and 7, the base plate 6 has
The base 5A is slidably supported by a slide mechanism including a rack 5B formed on one side surface of the base 5A of the bag storage box 5 and a pinion 6B provided on the base plate 6 side. A bag storage box 5 is provided.

As shown in FIGS. 6 and 7, the bag storage box 5 has a rectangular cross section, and includes first and second bags 3, 4 therein.
Is a box in which an accommodation space is formed, as shown in FIG.
An insertion opening for inserting the first and second bags 3, 4 into the communication hole 2A is formed in the base 5A. As shown in FIG. 8, the insertion opening 5 for the first bag is used as the insertion opening.
A1 and an insertion opening 5A2 for the second bag are formed. Of these insertion openings, the insertion opening 5A1 of the first bag 3 has a circular shape corresponding to the inner diameter of the communication hole 2A of the conduit 2, and Part of the inner peripheral edge of the insertion opening 5A2 of the second bag 3 has a crescent shape that matches the radius of curvature of the communication hole 2A. The shape of the insertion opening 5A1 of the first bag 3 is
It is determined by the relationship of arranging a cylindrical shell described later,
The insertion opening 5A2 of the second bag 4 is determined to reduce the sliding stroke of the bag storage box 5. FIG.
7 shows the positional relationship between the insertion opening and the communication hole 2A. In FIG. 6, the first bag 3 corresponds to the communication hole 2A, and in FIG. 7, the second bag 4 corresponds to the communication hole 2A. It corresponds to.

In FIG. 5, a base 5A of the bag storage box 5 is shown.
Is provided integrally with a support tube 12 whose center is aligned with the insertion opening 5A1 of the first bag 3 (see FIG. 8). The support tube 12 has an elbow shape penetrating the outer wall of the bag storage box 5. The first gas release member 13 composed of a joint member (FIG. 9)
12A) is formed. As shown in FIG. 1, the gas supply pipe 1
A shell 15 having a piston shape integral with the shell 4 can be inserted.

As shown in FIG. 9, the shell 15 has a first
A gas discharge passage 15A that can communicate with the inside of the flat pipe 3B1 of the insertion tube 3B of the bag 3, a round pipe 3B2 extending from the inside of the flat pipe 3B1, and a gas supply pipe 1
4 and a gas supply passage 15 </ b> B that can communicate with each other, and the gas discharge passage 15 </ b> A communicates with the first gas release member 13. The support cylinder 12 and the shell 15 are arranged in an O-ring 12B (see FIG. 5) disposed in the groove on the support cylinder 12 side and in a concave groove provided on the shell 15 side in order to maintain airtightness. O-ring 15C
And are used.

In the shell 15, a gas diffusion passage 15A
Communicates with the flat pipe 3B1, whereby the gas in the conduit 2 introduced into the opening 3B1A of the first bag 3 flows toward the first gas releasing member 13 as shown by an arrow in FIG. By connecting the gas supply passage 15B to the round pipe 3B2 in the flat pipe 3B1,
Carbon dioxide gas supplied from the gas supply pipe 14 can flow into the first bag 3 via the gas supply port 3B1B provided in the round pipe 3B2. As shown in FIG. 1, a joint member 16 for connecting a pipe extended from a pump or the like (not shown) is attached to an end of the gas supply pipe 14 opposite to the connection side with the shell 15. .

On the other hand, in FIG.
A second gas releasing member 17 is provided for releasing gas flowing from a contact surface between the peripheral surface of the first bag 3 and the inner wall surface of the conduit 2. The second gas release member 17 is configured by an elbow-shaped joint member mounted on an opening provided on the outer wall surface of the bag storage box 5 and communicates with the inside of the bag storage box 5.
The second gas releasing member 17 includes the first bag 3 and the second bag 4.
And the first bag 3
When gas leaking from between the outer peripheral surface of the tube and the inner peripheral surface of the conduit 2 enters, the gas is used to release the gas to the outside.

In FIG. 1, a lid 18 is attached to the upper surface of the bag housing box 5 so as to block the internal space, so that the second gas releasing member 17 can efficiently discharge gas. is there. Also, this lid 18 has
The guide cylinder 2 whose end opening is closed by the plug body 19 together with the support of the round pipe 4B provided in the second bag 4
0 is attached. Round pipe 4 on the second bag 4 side
A joint member 16 is attached to the tip of B in the same manner as the gas supply pipe 14. In addition, a window (not shown) is provided on a part of the side surface of the bag storage box 5 so that the inside can be seen through while being shielded from the outside, and the mounting state of the first and second bags 3 and 4 is provided. Can be seen.

Since the present embodiment has the above configuration,
The first and second bags 3, 4 are stored prior to being inserted into the conduit 2, if stored, when the bag body 3A,
4A is folded and bound by the hooks in the overlapping portion. When inserted into the conduit 2, the first bag 3
Are allowed to inflate the bag body 3A from which the hook has been removed. In the first bag 3 in this state, the flat pipe 3B1 and the round pipe 3B
The gas supply pipe 14 for supplying carbon dioxide gas to the round pipe 3B2 is also supported by the shell 15 on which the round 2 is supported. When the hook is removed to make it inflatable, the second bag 4 is inserted into the lid 18 of the gas shut-off device 1.
B is inserted.

Hereinafter, a procedure for inserting the first and second bags 3 and 4 will be described along a procedure for shutting off the conduit 2 by the gas shut-off device 1. (1) Communication hole 2 located in the vicinity of gas shut-off point in conduit 2
The gas shut-off device 1 is attached to A. In this case, the base plate 6 of the gas shut-off device 1 is rotatably provided by a ball bearing 10 disposed between the bearing member 9 on the side of the radiation valve 8 and the flange 6A on the side of the base plate 6. On the upper surface of the base plate 6, a bag storage box 5 is placed, and as shown in FIG. 6, a pinion 6B of the base plate 6 is engaged with a rack 5B of the base 5A and slides. It is movably supported. Bag storage box 5
Is the position where the insertion openings 5A1 and 5A2 (see FIG. 8) formed in the base 5A can face the communication hole 2A as shown in FIGS. 6 and 7, The positioning is performed by bringing the end face of the bag housing box 5 in the sliding direction into contact with a locking pin (not shown) provided on the base plate 6, and furthermore, the bag housing box 5 at that position. Is carried out by setting a detachable operation member provided at a position opposed to each other between the base plate 6 and the bag storage box 5 in an engaged state.

(2) When the gas shutoff device 1 is attached, the first bag 3 and the second bag 4 are loaded into the bag storage box 5 of the gas shutoff device 1. In this case,
As shown in FIG. 9, the insertion tube 3B having the first bag 3
Is loaded into the bag storage box 5 while being attached to the shell 15 to which the gas supply pipe 14 is attached.
The insertion tube 4 </ b> B having the bag 4 is loaded in the bag storage box 5. When the shell 15 is loaded into the bag storage box 5, the positional relationship is set such that the gas diffusion path 15 </ b> A of the shell 15 and the first gas release member 13 communicate with each other through the opening 12 </ b> A of the support cylinder 12.

(3) When the first and second bags 3, 4 have been loaded into the bag housing box 5, the first bag 3 inserted into the bag housing box 5 is inserted into the communication hole 2A. In this case, the rack 5B meshing with the pinion 6B is moved by rotating the pinion 6B (see FIG. 6) of the base plate 6 in the bag storage box 5, so that the insertion opening 5A1 of the base 5A is moved. (See FIG. 8)
Move to a position communicating with A. The movement of the base 5A
The insertion opening 5A1 is positioned at a position where the insertion opening 5A1 communicates with the communication hole 2A by being restricted by the contact between the not-shown locking pin and the end face of the bag storage box 5. When the positioning of the communication hole 2A with respect to the insertion opening 5A1 is completed, the first bag 3 is inserted into the conduit 2 with the flat pipe 3B1 abutting a part of the inner peripheral surface of the communication hole 2A.

(4) After the first bag 3 has been inserted into the communication hole 2A, the second bag 4 is then inserted into the communication hole 2A. In this case, as shown in FIGS. 6 and 7, the rack 5B meshing with the pinion 6B moves when the pinion 6B of the base plate 6 is rotated, so that the base 5A Insertion opening 5A
2 (see FIG. 8) moves toward a position communicating with the communication hole 2A. The movement of the base 5A is regulated by the contact between the not-shown locking pin and the end face of the bag housing box 5, and is positioned at a position where the insertion opening 5A2 communicates with the communication hole 2A.
1 and 7, the insertion opening 5A is inserted into the communication hole 2A.
When the positioning of No. 2 is performed, the second bag 4 is inserted into the insertion opening 5A2 together with the insertion tube 4B.

(5) The first and second bags 3 and 4 are
When each is inserted into A, the first bag 3, the second bag
The bags 4 are inflated in this order. In this case, a pipe (not shown) is sequentially connected to the joint member 16 provided at the tip of the gas supply pipe 14 on the first bag 3 side and the insertion pipe 4B on the second bag 4 side, and carbon dioxide gas is supplied.
The second bag 4 is inflated after the first bag 3 is inflated. On the first bag 3 side, the carbon dioxide gas flows from the gas supply pipe 14 through the gas supply passage 15B in the shell 15 (see FIG. 9) to the round pipe 3B2.
The first bag 3 flows through the opening 3B1B (see FIG. 4) of the bag body 3A of the first bag 3 (see FIG. 4), and the first bag 3 is inflated. On the second bag 4 side, carbon dioxide gas flows through the insertion tube 4B, and the gas discharge portion 4B
The first bag 1 enters the second bag 4 through the first bag 1 and inflates the second bag 4. When the internal pressure acts on the entire inner surface, the first bag 3 and the second bag 4 which start to inflate when the carbon dioxide gas enters the inner surface are restricted by the suspension band 7 in the gas flow direction. Pressure to increase. For this reason, the adhesion between the peripheral surface of the first bag 3 and the inner peripheral surface of the conduit 2 is enhanced, and the gas can be more reliably shut off. Moreover, the outer peripheral surfaces of the inflated first and second bags 3 and 4 have a higher friction coefficient because the rubber of the rubberized nylon base cloth which is a constituent member of the bag bodies 3A and 4A is located on the surface. Therefore, careless displacement is prevented. Further, the first bag 3 located on the upstream side in the flow direction of the gas in the conduit 2 is inflated at least before the second bag 4 to block the gas, thereby reducing the pressure of the blocked gas. Although the gas suddenly increases, the gas flowing in the conduit 2 flows into the concave portion 3A2 of the first bag 3, and immediately the opening 3B of the insertion tube 3B.
As shown by an arrow in FIG. 9, the air flows toward the first gas releasing member 13 through 1A (see FIG. 4), so that the expansion of the first bag 3 is not hindered and rapid expansion is possible. . It is desirable that the supply pressure and the internal pressure to the first bag 3 be monitored by a pressure gauge (not shown).

The first inserted in the conduit 2 in this manner
The second bags 3, 4 are located on the upstream side and the downstream side in the gas flow direction, so that the space partitioned by the two bags is configured as a closed space. Thereby, the gas can be satisfactorily shut off by providing the double gas shut-off wall in the gas flow direction.

On the other hand, a high-pressure gas of the supply pressure in the high-pressure line is stored in the conduit 2 on the upstream side in the gas flow direction where the first bag 3 is located. For this reason, these gases are concentrated in the concave portion 3A2 of the bag body 3A of the first bag 3 and, through the opening 3B1A (see FIG. 4) of the insertion tube 3B, as shown by the arrow in FIG. It can flow toward the discharge member 13 and discharge to the outside. Thereby, even when the gas accumulated in the conduit 2 acts on the first bag 3, the gas can be easily released, so that the first bag 3 and the second bag 4 are prevented from being pushed and moved. Thus, it is possible to maintain the close contact between the peripheral surfaces of the bags 3 and 4 and the inner peripheral surface of the conduit 2 for a long time.

Further, the gas leaking from the contact surface between the peripheral surface of the first bag 3 and the inner peripheral surface of the conduit 2 toward the second bag 4 due to the supply pressure of the gas acting on the first bag 3
It enters into the closed space partitioned by the bag 3 and the second bag 4. For this reason, the second gas release member 1 is connected via the bag housing box 5 which is set to be in communication with the closed space.
Gas can flow into 7, thereby suppressing an increase in internal pressure in bag storage box 5.

[0038]

As apparent from the above description, according to the first and second aspects of the present invention, when the bag is inflated, the bag body is formed to have a rectangular cross section, so that the bag is inflated in the laying direction of the conduit. Can be prevented, and point contact that makes contact with the inner peripheral surface of the pipeline unstable can be prevented, so that the area of close contact with the inner peripheral surface of the pipeline can be increased. In particular, according to the second aspect of the present invention, since the suspension band for restricting the expansion of the pipeline in the laying direction is provided, the pressure acting in the pipeline laying direction can be reliably applied to the peripheral surface side. Become. In addition, unlike the case of inflating in a balloon shape, the working pressure in the direction in which the pipeline is laid can be applied to the inside of the peripheral surface. Adhesion with the surface is ensured.

According to the third aspect of the present invention, since the coefficient of friction of the wind surface of the bag body is increased, even if the bag body is pushed and moved by the fluid pressure in the pipeline, it does not displace and has good adhesion. Can be maintained.

According to the fourth to sixth aspects of the present invention, since the bag body is formed in a flag shape together with the pipe and is foldable, the bag body can be inserted even into a narrow insertion portion. Moreover, the fluid pressure in the pipeline acting on the bag body can be reduced by discharging the fluid in the pipeline from the external discharge intake portion of the bag body to the outside. It is possible to prevent deterioration of the adhesion between the inner peripheral surface of the road and the road.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a main configuration of a gas shut-off device using a pipeline shut-off bag according to an embodiment of the present invention.

FIG. 2 is a perspective view illustrating a configuration of a first bag which is a pipeline blocking bag according to an embodiment of the present invention.

FIG. 3 is a side view of the first bag shown in FIG. 2;

FIG. 4 is a schematic diagram for explaining a relationship between an insertion tube used in the first bag shown in FIG. 2 and a bag main body.

5 is a cross-sectional view for explaining an installation structure in the gas shutoff device shown in FIG.

FIG. 6 is a plan view for explaining a state when the first bag is inserted in the gas shut-off device shown in FIG. 1;

FIG. 7 is a plan view for explaining a state when the second bag is inserted in the gas shut-off device shown in FIG.

FIG. 8 is a diagram showing first and second gas shut-off devices shown in FIG. 1;
It is a partial sectional view for explaining the relation between the insertion part of the bag and the communication hole.

FIG. 9 is a diagram showing first and second gas shut-off devices shown in FIG. 1;
It is a schematic diagram for explaining a bag insertion state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gas shut-off device 2 Conduit 2A communication hole 3 1st bag 3A Bag main body 3A2 Concave portion for taking in gas on the upstream side in the gas flow direction 3B Insertion tube 3B1 Flat pipe 3B1A Opening corresponding to concave portion 3B1B Opening for gas introduction portion 4 2 Bag 4A Bag main body 4A1 Gas inlet 4B Insertion tube 4B1 Gas discharge unit 5 Bag storage box 5B Rack 5A1 First bag insertion opening 5A2 Second bag insertion opening 6 Base plate 8 Dissipation valve connected to communication hole 10 Ball bearing 11 Pinion 13 First gas release member 15 Shell 15A Gas diffusion path 15B Gas supply path to bag 17 Second gas release member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Nori Morita 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Osaka Gas Co., Ltd. (72) Inventor Akihito Mori 8--19, Fukuda, Yamato-shi, Kanagawa No. 35 (72) Inventor Hiroshi Takahata 7-14-1, Ikegami, Ota-ku, Tokyo

Claims (6)

[Claims] 1. A pipeline blocking bag used for sealing a fluid in a pipeline, comprising a bag body made of an elastic bag capable of being inflated and contracted by the inflow and outflow of gas, A bag for shutting off a pipeline, wherein the bag body has a substantially rectangular cross section having a long side in a direction perpendicular to a laying direction of the pipeline when inflated. 2. The pipeline blocking bag according to claim 1, wherein the bag body is formed by a suspension band that is integrated and stretched over at least surfaces of the pipeline along a direction in which the pipeline is laid. Characterized in that the amount of inflation in the laying direction is defined and the hand cross-sectional shape is kept substantially rectangular. 3. The bag for blocking a pipeline according to claim 1, wherein the bag body has a surface facing the inner peripheral surface of the pipeline having a higher coefficient of friction than other surfaces. Characteristic pipeline blocking bag. 4. The pipe line blocking bag according to claim 1, wherein the bag body has a surface integrated with a pipe having a space that can communicate with the inside of the bag body, and the pipe is connected to a flagpole. Wherein the bag body is formed in a flag shape corresponding to a flag and is foldable. 5. The pipe line blocking bag according to claim 4, wherein the bag main body has a take-out portion for external discharge of fluid upstream of a flow direction of the fluid in the pipe, which communicates with the pipe. A bag for blocking a pipeline, wherein the bag is formed. 6. The pipe according to claim 4, wherein the bag body is provided with a hook corresponding to a binding portion in a folded and overlapping portion to maintain a folded state. Road blocking bag.