JPH11159690A - Hose for mobile conduit cut-off device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate handling of a hose for a mobile conduit cut-off device so as to improve work efficiency. SOLUTION: Inside a conduit 10, a mobile conduit cut-off device 1, which can be moved along an axis 10a, and its hose 12 are inserted. At the tip of the hose 12, a coupler 13, which can be attached/detached to/from a connection port of a fluid connector in a single operation, is installed so as to introduce fluid for inflation toward elastic film bodies 4, 5 of stoppers 2, 3 in the mobile conduit cut-off device 1 via an internal hose 15. When the elastic film bodies 4, 5 are expanded, the inside of the conduit 10 can be closed airtightly. Inside the hose 13, rigging 16 is also housed, and the mobile conduit cut-off device 1 can be pulled in the axis 10a direction when the coupler 13 is pulled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable conduit shutoff device which is movable in a conduit for transporting gas such as city gas and the like, and inflates at an arbitrary position to block the conduit. The present invention relates to a hose for supplying a movable conduit blocking device.

[0002]

2. Description of the Related Art Conventionally, when a pipe for transporting city gas or the like buried underground becomes obsolete, a construction for replacing an aging old pipe with a new pipe is performed. Prior art for this replacement work is disclosed, for example, in Japanese Patent Publication No. 1-28.
171 and the like. In such replacement work, there is used a movable conduit blocking device that is movable in the axial direction of the conduit and can be stopped at an arbitrary position to hermetically close the conduit. 2. Description of the Related Art The prior art relating to a mobile conduit blocking device is disclosed, for example, in Japanese Patent Publication No. 62-58435. This prior art mobile conduit shut-off device is generally cylindrical and, when fluid is pumped in, can be partially expanded to hermetically close the conduit.

[0003]

The replacement of aged pipes with new pipes takes place over the entire pipe buried at the same time and must be carried out over a considerable distance.
Since conduits are generally buried under the ground surface for public use such as roads, it is not possible to dig around the entire conduit and replace it at once with new pipes. It is necessary to repeat excavation, backfilling, and replacement so that the whole is finally replaced. For this reason, it is necessary for the movable pipe cutoff device to move inside the pipe with the progress of the replacement work and hermetically close the tip of the replaced new pipe.

[0004] In the mobile conduit shutoff device disclosed in Japanese Patent Publication No. 62-58435, the hose for supplying the inflation fluid is drawn out of the mobile conduit shutoff device separately from the towing rigging. In the mobile conduit blocking device of Japanese Patent Publication No. 62-58435, two inflation portions are provided at an axial interval, and the inflation fluid is separately supplied to the two inflation portions, and at least two hoses are provided. Is used. In this prior art movable conduit shut-off device, the hose for supplying the inflation fluid and the rigging for the movement are separate, and are shown in FIGS. 3 to 6 of Japanese Patent Publication No. 1-28171. As shown in the figure, the conduit into which the movable conduit blocking device is inserted is open at one end to pull out the hose or rigging from inside the conduit, or closed at one end to place the hose or rigging inside the conduit. It can only be used in the fastened state.
Therefore, the hermetic blockage or movement due to the expansion of the movable conduit blocking device is considerably troublesome, and the time required for the replacement work with new pipes is prolonged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mobile conduit shut-off device which is easy to handle when moving the mobile conduit shut-off device in a conduit and stopping at a desired position to block gas flow in the conduit. Is to provide a hose.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a mobile conduit shut-off device which is operable in an axial direction within a gas transport conduit to expand in the conduit to block gas flow in the conduit. A hose for supplying an inflation fluid, having an inner hose that is flexible and guides a fluid containing the inflation fluid, an outer hose that has flexibility and surrounds the inner hose, A coupler provided on the distal end side of the inner hose, having an outer diameter within a predetermined range based on the outer diameter of the outer hose, and detachably attached to the fluid supply unit of the fluid supply device with one touch; And a cord attached to the coupler and the movable conduit blocking device, attached to the coupler, connected to a tip of the internal hose, and attached to the fluid supply unit. Making the fluid flow path conductive,
A valve for shutting off a fluid flow path when the coupler is disconnected from the fluid supply unit.

In accordance with the present invention, an inflation fluid for inflating a mobile conduit shutoff is directed to a flexible inner hose. A valve is connected to the tip of the internal hose,
The valve is mounted on the coupler. The coupler and the movable conduit blocking device are connected by a cord. The coupler can be attached and detached with a single touch to a fluid supply unit of a supply device for an inflation fluid such as air or water, and the valve conducts a fluid flow path when attached to the fluid supply unit. When the coupler is detached from the fluid supply unit, the flow path of the fluid is blocked by the valve. The inner hose and rigging are surrounded by an outer hose and can be handled like a single hose as a whole. Since the outer diameter of the coupler is within a predetermined range based on the outer diameter of the outer hose, if a sealing device is provided around the coupler and the outer hose, the coupler and the outer hose can be easily and securely sealed. It can be pulled out while stopped. When the coupler is not attached to the fluid supply unit of the fluid supply device, the valve blocks the fluid flow path, so that the fluid does not leak to the outside and, for example, the movable conduit blocking device is maintained in an expanded state. be able to. When the coupler is attached to the fluid supply unit of the fluid supply device, the valve conducts the fluid flow path, so it supplies an expansion fluid for hermetic blockage in the conduit or stops the hermetic blockage and moves. The operation of discharging the inflation fluid to move the conduit shutoff device in the conduit can be easily performed. Since the coupler and the movable conduit blocking device are connected by a rigging device, when the coupler is pulled, the rigging device can also pull the mobile conduit blocking device in the axial direction of the conduit and tow.

In the present invention, a plurality of sets of the internal hose and the valve are provided.

According to the present invention, a plurality of sets of valves and internal hoses are used to separately supply inflation fluid to a plurality of locations of a movable conduit shutoff device, thereby reliably shutting off gas flow in the conduit. can do. The plurality of valves are in a state of conducting the fluid flow path when the coupler is mounted on the fluid supply unit of the fluid supply device, and are closed when the coupler is separated from the fluid supply unit. In addition, it is possible to quickly replace old and new underground pipes using a mobile conduit blocking device.

[0010] The present invention also provides a tip coupler having a structure equivalent to the coupler, a base coupler having the same outer diameter as the coupler, wherein the coupler is detachable and equivalent to the fluid supply unit, A distal valve attached to the distal coupler and having a structure equivalent to that of the valve; and a distal valve attached to the proximal coupler and connectable to the valve, opened in a state of being connected to the valve, and disconnected. A proximal valve that closes in a state, an internal connection hose that connects between the distal valve and the proximal valve, a connecting cord that connects the distal coupler and the proximal coupler, An extension hose including an internal connection hose and an external connection hose that surrounds the connecting cord and has flexibility and an outer diameter equal to that of the external hose is provided.

According to the present invention, an extension hose is attached to the hose for supplying the inflation fluid by one-touch to the hose connected to the movable conduit cutoff device, so that the entire length of the hose is extended, and the old and new tubes are replaced. At the time of construction, etc., the work of replacing with a long pipe can be easily performed. If the base coupler of the extension hose is attached to the coupler at the end of the hose of the mobile conduit cutoff device, the valve in the coupler and the base valve in the base coupler are connected, and the mobile conduit cutoff The internal hose in the device hose communicates with the internal connection hose in the extension hose. The expansion coupler can be supplied and discharged by attaching the coupler for the end of the extension hose to the fluid supply section of the fluid supply device. By attaching and detaching the extension hose,
The length of the hose can be adjusted and the mobile conduit blocking device can be used effectively even for long conduits.

[0012]

FIG. 1 shows a schematic configuration of a hose for a movable conduit blocking device according to an embodiment of the present invention. The movable conduit blocking device 1 includes two stoppers 2 and 3,
Each of the stoppers 2 and 3 is provided with an elastic film body 4 and 5, respectively. For example, air or water is supplied as an expansion fluid to the elastic membranes 4 and 5 via the tubes 6 and 7. An interval is provided between the stoppers 2 and 3, and the stoppers 2 and 3 are connected by a universal joint 8. One end of the universal joint 9 is also connected to the leading stopper 2. The movable conduit blocking device 1 having the two stoppers 2 and 3 is movable along an axis 10a in a conduit 10 for transporting gas such as for supplying city gas. Top stopper 2
The other end of the universal joint 9 whose one end is connected to
Is connected. A hose 12 and a coupler 13 are connected to the front of the guide 11 in the direction of the axis 10a. In the hose 12, an inner hose 15 and a rigging 16 connected to the tubes 6 and 7 are housed in an outer hose 14. The cordage 16 is connected between the guide 11 and the coupler 13, and when the coupler 13 is pulled in the direction of the axis 10 a, the stoppers 2, 3 are pulled from the guide 11 via the universal joints 8, 9 and moved in the direction of the axis 10 a. Can be done. Coupler 13
Inside, a valve as described later is provided, and when the coupler 13 is not connected, the end of the internal hose 15 is shut off. The outer hose 14 and the inner hose 15 are made of a flexible rubber or synthetic resin material. The outer diameter of the outer hose 14 is D0. The cordage 16 is made of a steel wire or the like.

FIG. 2 shows the configuration of the coupler 13 of FIG.
A valve 21 is housed in the coupler body 20. Valve 21
Is composed of a base end portion 22, an intermediate portion 23, and a tip end portion 24. The proximal end portion 22 has a flow portion 25 through which a fluid can pass.
Is formed, and the fluid can be circulated from inside the base end portion 22 to the outside. The O-ring 2
6 is mounted. The distal end portion 24 is formed with a flow portion 27 that allows communication between the inside and the outside. The valve 21 is pressed by a spring 28 toward the distal end in the direction of the axis 21a. In this state, the O-ring 26 attached to the intermediate portion 23 contacts the end face of the holder 29 and
The flow path between the second circulation part 25 and the circulation part 27 of the distal end part 24 is blocked. When the distal end portion 24 is pressed against the base end side in the direction of the axis 21a with a force larger than the pressing force of the spring 28, the valve 21 moves to the base end side along the axis 21a. O
The ring 26 is separated from the end face of the holder 29, and the cutoff of the flow path between the flow part 25 of the base end part 22 and the flow part 27 of the front end part 24 is released, and the space between the base end part 22 and the front end part 24 is released. It becomes conductive. Such movement of the valve 21 toward the base end in the direction of the axis 21a occurs, for example, when the coupler 13 is mounted on the fluid supply device and the distal end portion 24 of the valve 21 contacts the fluid supply port. A groove 30 is formed around the coupler body 20, and if the groove 30 is used, it is possible to temporarily hold the coupler 13 at the time of mounting. The outer diameter D1 of the coupler 13 is larger than the outer diameter D0 of the outer hose 15 shown in FIG.
Keep it in a slightly larger range.

FIG. 3 shows the configuration of an extension hose 32 used to extend the length of the hose 12 shown in FIG. A distal end coupler 33 similar to the coupler 13 in FIG. 1 is attached to the distal end side of the extension hose 32. Extension hose 32
Has an external connection hose 34, an internal connection hose 35, and a connection rig 36 equivalent to the external hose 14, the internal hose 15, and the rigging 16 of the hose 12. External connection hose 3
4. The internal connection hose 35 and the connecting cord 36 are basically the same as the external hose 14, the internal hose 15 and the cord 16 except for the length. On the proximal end of the extension hose 32,
The proximal coupler 37 is attached. Base end coupler 37
Is basically equivalent to the fluid supply section of the fluid supply device,
The coupler 13 can be attached and detached with one touch.

FIG. 4 shows the configuration of the proximal coupler 37 of FIG. The valve 41 is housed in the coupler body 40. Valve 4
1 has a base end portion 42, an intermediate portion 43, and a front end portion 44 in the direction of the axis 41a. A flow portion 45 that connects the inside and the outside is formed at the base end portion 42, an O-ring 46 is attached to the intermediate portion 43, and the inside and the outside communicate with the front end portion 44. The circulation part 47 is formed. The valve 41 includes a spring 48
As a result, it is pressed toward the tip end of the axis 41a. In this state, the O-ring 46 abuts on the end face of the holder 49 and blocks the flow between the flow parts 45 and 47.

When the coupler 13 shown in FIG. 2 is inserted from the distal end side of the coupler body 40, the end face of the distal end 24 of the valve 21 shown in FIG. 41 moves to the base end side along the axis 41a.
At this time, the O-ring 46 separates from the end face of the holder 49,
A conduction state is established between the circulation parts 45 and 47. That is, when the coupler 13 and the base-end coupler 37 are mounted, the valve 21,
Each of the internal hoses 15 in the hose 12 and each of the internal connection hoses 35 in the extension hose 32 are electrically connected to each other via 41. When the coupler 13 and the base-end coupler 37 are separated from each other, the O-rings 26 and 46 of the valves 21 and 41 are brought into close contact with the end faces of the holders 29 and 49 by the springs 28 and 48 so as to cut off the conduction state.

A ball hole 5 is provided on the outer peripheral side of the coupler body 40.
1 is formed, and the ball 52 is held. Ball hole 51
Is set to a position corresponding to the groove 30 provided in the coupler body 20 in a state where the coupler 13 is mounted on the base end coupler 37. The ball 52 is pressed from the outer peripheral side by the sleeve 53, the inside is fitted into the groove 30, and the ball 13 acts to prevent the coupler 13 from being detached from being mounted on the proximal coupler 37. A sleeve 53 pressing the ball 52 inward in the radial direction is slidable on the outer peripheral surface of the coupler body 40 in the axial direction.
2 is held at a position near the front end that presses inward.
When the sleeve 53 is moved toward the base end in the axial direction against the pressing force of the spring 54 to release the pressed state of the ball 52, the ball 52 can be moved radially outward, and Insertion and ejection of the coupler 13 with respect to the coupler 37 become possible. Note that the outer diameter D2 of the proximal coupler 37 is
3 is equal to the outer diameter D1.

FIGS. 5 to 8 show a state in which replacement work of the gas transportation conduit is performed using the movable conduit blocking device 1 shown in FIG. 1 and the extension hose 32 shown in FIG. In this replacement work, the city gas pipe 61 is replaced with old pipes 62a and 62b such as cast iron pipes and new pipes 63 made of synthetic resin such as polyethylene (PE). FIG. 5 shows the work end state on the first day. The excavation extension range of L2 including the replacement range L1 on the first day is cut open to expose the old pipes 62a and 62b. The old pipe 62b is cut at both ends of the replacement range L1, leaving the old pipe 62a and the remaining part of the old pipe 62b at both ends. The insertion holes 64a, 64b are provided in the old pipes 62a, 62b.
Are provided by drilling. From the insertion holes 64a and 64b, gas bags 65a and 65b are inserted into the old pipes 62a and 62b.
Insert each. When the gas bags 65a and 65b are inflated, the old pipes 62a and 62b can be hermetically closed. The old pipe 62a at one end of the replacement range L1 is
It is assumed that the entire replacement section is located at one end side, and remains as it is even when the replacement work proceeds toward the other end side. A sleeve 66 is attached to the end of the old pipe 62a, and a transition joint 67 is further attached. The other end of the transition joint 67 is connected to one end of a new pipe 63 for piping on the day. The other end side of the new pipe 63 is inserted with a movable conduit shut-off device 1 that is movable in the axial direction in the new pipe 63 and that closes the inside of the new pipe 63 in an airtight manner when a fluid is supplied and expanded. . A fluid for inflation is supplied to the movable conduit blocking device 1 via a hose 12. At the other end of the new pipe 63, a pipe end sealing device 70 is mounted. The pipe end sealing device 70 can pull out the hose 12 from the inside of the new pipe 63 to the outside in the axial direction. The drawer of the hose 12 is hermetically sealed, and a lid 71 can be attached to the periphery of the drawer of the hose 12 to perform a further airtight seal. FIG. 5 shows a state in which the lid 71 is attached to the pipe end sealing device 70.

On the side of the old pipe 62b remaining on the first day, the end is covered with a cap 72 so that the sealing is reliably performed. When city gas is required to be transported between the new pipe 63 and the old pipe 62b, a hose or the like is connected between the connection port 73 provided in the pipe end sealing device 70 and the insertion hole 64b of the old pipe 62b. You can also connect and contact with.

FIG. 6 shows the construction state after the second day.
First, the lid 71 of the pipe end sealing device 70 is removed, and the hose 12 is removed.
And the coupler 13 at the end of the hose 12 is attached to the connection port of the fluid supply device 74. A pump 75 is connected to the fluid supply device 75 to supply a fluid such as air or water as shown in FIG.
Can be sent to the elastic membranes 4 and 5 of the movable conduit blocking device 1 shown in FIG.

When the fluid is sent from the pump 75, the new pipe 6
Since the end of the tube 3 is sealed, gas can be prevented from leaking even if the tube end sealing device 70 is removed. Next, the old pipe 62b in the replacement range of the day is cut off at the boundary with the remaining old pipe 62c and removed. As a preparation for this removal, the gas bag 65b that previously sealed the end of the old pipe 62b is contracted and pulled out from the insertion hole 64b.
At the end of the remaining old pipe 62c, an insertion hole 64c is pierced and provided, and a gas bag 65b is inserted and airtightly closed. The old pipe 62 after cutting and removing the old pipe 62b.
A cap 72 is attached to the tip of c to ensure airtight sealing.

FIG. 7 shows, as a next step of FIG. 6, a state in which a new pipe 63b to be piped on the day is connected to a new pipe 63a which was piped the day before. The pipe end sealing device 70 removed from the end of the new pipe 63a in FIG. 6 is attached to the end of the new pipe 63b. The extension hose 32 shown in FIG. 3 is inserted into the pipe end sealing device 70 to allow the inside of the new pipe 63b to pass in the axial direction. Connect the proximal coupler 37 of the extension hose 31 to the coupler 1 of the hose 12.
After being mounted on the pipe 3, the new pipes 63 a and 63 b are connected by the electric fusion joint 77.

FIG. 8 shows that after the connection by the electrofusion joint 77 is completed, the fluid supply device 74 is operated to contract the elastic membranes 4 and 5 of the movable conduit blocking device 1 to release the airtight closed state. After that, a state where the extension hose 32 is being pulled from outside the pipe end sealing device 70 is shown. By pulling on the extension hose 32, the movable conduit blocking device 1 can be moved in the axial direction from the new pipe 63a to the new pipe 63b.
When the movable conduit blocking device 1 moves to the vicinity of the pipe end sealing device 70, the movable conduit blocking device 1 and the pipe end sealing device 70
Are the same as in FIG. If the extension cord 32 is detached from the distal end of the hose 12 and the lid 71 is attached to the distal end of the pipe end sealing device 70, the work on that day can be completed, and for example, the excavated earth and sand can be backfilled.

On the last day, as shown in FIG. 8, the movable conduit cutoff device 1 is sequentially drawn to a position near the pipe end sealing device 70 as shown by 1a and 1b, and the end of the new pipe 63b is pulled. After a saddle for guiding the bag is fused outward, a gas bag is inserted by piercing the insertion hole, and the inside of the new pipe 63b is airtightly closed, and then the pipe end sealing device 70 and the movable conduit blocking device 1 Remove. Also remove the cap 72 on the old pipe 62c side,
The connection using the transition joint 67 and the sleeve 66 as shown in FIG. 5 is performed between the new pipe 63b and the old pipe 62c.

FIG. 9 shows a tube end sealing device 7 shown in FIGS.
0 shows the structure. The axis 80a of the casing 80 of the pipe end sealing device 70 is aligned with the axis of the conduit in which the pipe end sealing device 70 is mounted. In the pipe end sealing device 70, a guide tube 81 for guiding the hose 12 and the extension hose 32 of the movable conduit blocking device 1 in the direction of the axis 80a is provided. Guide tube 8
Seal members 82 and 83 are provided on both sides in the direction of the axis 80a.
Are respectively mounted. The sealing members 82 and 83 are formed of an elastic body such as rubber, and have an outer diameter of D at the tip of the lip.
The outer hose 15, the external connection hose 35, the coupler 13, the distal coupler 33, and the proximal coupler 37 near zero can be sealed. Thus, the hose 12 and the extension hose 32 can be pulled out from the drawer 84 provided at the tip of the casing 80 in the direction of the axis 80a while maintaining airtightness. The drawer 84 includes the lid 7 described above.
1 can be mounted and hermetically sealed. The casing 80 is also provided with the connection port 73 described above, and the cap 85
It is also possible to put in a sealed state.

If the cap 85 is removed, a gas release tube can be attached to the connection port 73 to perform an air release or ignition test. On the base end side of the casing 80 in the direction of the axis 80a,
A flange 86 is provided for use in mounting the tube end sealing device 70 to the end of the conduit.

FIG. 10 shows that the underground pipe can be easily replaced by using the hose 12 and the extension hose 32 of the present embodiment. FIG. 10 (a) shows a state in which the end of the conduit 62b on which the above-described construction has been completed is sealed with the movable conduit cutoff device 1, and then the tube end sealing device 70 is further attached to ensure airtight sealing. Shows the state of going. In this state,
FIG. 10B shows a state in which earth and sand are backfilled around the pipe end sealing device 70, and then the earth and sand is removed again and the new pipe 63b is mounted.
It is. An extension hose 32 is attached to the hose 12, and the extension hose is pulled out of the pipe end sealing device 70 to move the movable conduit blocking device 1. When the movable conduit blocking device 1 is drawn near the pipe end sealing device 70, FIG.
And the process can proceed to the next stage.

[0028]

As described above, according to the present invention, the inner hose and the rigging are stored in the outer hose, and if the coupler at the tip is pulled, the movable conduit blocking device can be pulled through the rigging. If the coupler is attached to the fluid supply unit of the fluid supply device with one touch, an inflation fluid for shutting off the inside of the conduit can be easily supplied. When the coupler is separated from the fluid supply unit, the valve shuts off the fluid flow path of the inflation fluid, so that the inflation state can be maintained as it is. Since the outer diameter of the coupler is within a predetermined range based on the outer diameter of the outer hose, it is easy to handle the coupler and the periphery of the outer hose in a hermetically sealed manner. It can be done efficiently.

Further, according to the present invention, connection of a plurality of fluid supply systems to and from the movable conduit blocking device can be easily performed.

According to the present invention, a hose for supplying an inflation fluid or the like to the movable conduit shut-off device can be easily extended by attaching the extension hose with a single touch, so that work in a long conduit can be performed. It can be easily handled.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a hose for a movable conduit blocking device according to an embodiment of the present invention.

FIG. 2 is a side view showing a lower half of the coupler 13 of FIG. 1 in cross section.

FIG. 3 is a perspective view of an extension hose 32 for extending the hose 12 of FIG.

FIG. 4 is a side view showing a lower half of a proximal coupler 37 used in the extension hose 32 of FIG. 3 in cross section.

FIG. 5 is a simplified perspective view showing a partially cut-out state of the end of the first day of the replacement work of the underground pipe using the hose for the movable conduit blocking device of FIG. 1;

FIG. 6 is a simplified perspective view showing the stage after the second day of the replacement work, partially cut away.

FIG. 7 is a simplified perspective view showing the stage shown in FIG. 6 of the replacement work, partially cut away.

FIG. 8 is a simplified perspective view showing a stage subsequent to FIG. 7 of the replacement work, partially cut away.

9 is a side sectional view showing the structure of the pipe end sealing device 70 of FIGS.

10 is a simplified side cross-sectional view showing the relationship between the movable conduit blocking device 1 and the pipe end sealing device 70 during the replacement work shown in FIGS.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable conduit blocker 2, 3 Stopper 4, 5 Elastic membrane 10 Duct 10a, 21a, 41a Axis 12 Hose 13 Coupler 14 External hose 15 Internal hose 16 Cordage 20 Coupler body 21 Valve 22, 42 Base end 23, 43 Intermediate part 24, 44 Tip part 25, 27, 45, 47 Flow part 26, 46 O-ring 28, 48, 54 Spring 29, 49 Holder 30 Groove 32 Extension hose 33 Tip coupler 34 External connection hose 35 Internal connection hose 36 Connecting cord 37 Base coupler 52 Ball 53 Sleeve 62a, 62b, 62c Old pipe 63, 63a, 63b New pipe 65a, 65b Gas bag 70 Pipe end sealing device 71 Lid 74 Fluid supply device 81 Guide cylinder 82, 83 Seal member 84 Pull-out part

Claims (3)

[Claims] 1. A hose for supplying an inflation fluid for inflating a gas in a conduit to a movable conduit blocking device operable in an axial direction within a gas transport conduit. An inner hose that is flexible and guides a fluid including the inflation fluid; an outer hose that is flexible and surrounds the inner hose; and is provided on a tip side of the inner hose. A coupler having an outer diameter within a predetermined range based on the outer diameter of the outer hose and detachably attached to the fluid supply unit of the fluid supply device with one touch; and a coupler housed in the outer hose; A cord for connecting the movable conduit cutoff device; a cable attached to the coupler; a tip of the internal hose is connected; Fluid with the coupler disconnected from the fluid supply A valve for shutting off the flow path of the movable conduit shutoff device. 2. The hose according to claim 1, wherein a plurality of sets of the internal hose and the valve are provided. 3. A coupler for a distal end having a structure equivalent to that of the coupler, a coupler for a proximal end having the same outer diameter as the coupler, wherein the coupler is detachable similarly to the fluid supply unit, and a coupler for the distal end. A distal valve attached to the coupler and having a structure equivalent to that of the valve; attached to the proximal coupler, connectable to the valve, opened when connected to the valve, and closed when disconnected. A proximal valve, an internal connection hose connecting between the distal valve and the proximal valve, a connecting cable for connecting the distal coupler and the proximal coupler, and the internal connection hose 3. An extension hose which surrounds the connecting cord and includes an extension hose having flexibility and an external connection hose having an outer diameter equivalent to that of the external hose. Hose for mobile conduit shut-off device.