JP5651066B2 - Gas replacement method in gas pipe and gas replacement device in gas pipe - Google Patents

Description

  The present invention relates to a gas replacement method in a gas pipe and a gas replacement device in a gas pipe that discharges gas staying in a predetermined section in the gas pipe to the outside and replaces it with another gas.

Conventionally, when a new gas pipe is connected to an existing gas pipe, or when a part of an existing gas pipe is replaced with a new gas pipe, the gas remaining in the gas pipe is discharged to the outside, etc. Or work after replacing the gas.
For example, in Patent Document 1, a partition wall that is movable while partitioning the inside of the gas pipe is installed in the gas pipe, and the partition wall is moved to stay in the gas pipe from a communication hole formed by drilling the gas pipe. A gas replacement method in a gas pipe is disclosed in which the gas to be discharged is discharged and another gas is replaced in the gas pipe.
The partition wall has a bag body that can be expanded and contracted in the gas pipe, and the bag body is inflated by increasing the internal pressure, pressing the gas pipe and closely contacting the inner peripheral surface of the gas pipe. The inside of the gas pipe is partitioned.

JP 2007-198524 A

However, in the gas replacement method in the gas pipe disclosed in Patent Document 1, since the bag main body of the partition wall partitions the gas pipe in a state of pressing the gas pipe, the partition wall is a bent portion in a joint portion of the gas pipe or the like. When passing through or a step, it is necessary to adjust the internal pressure of the bag body or adjust the force to move the partition wall.
In addition, since the bag body of the partition wall slides in close contact with the inner peripheral surface of the gas pipe, friction occurs between the bag main body and the inner peripheral surface of the gas pipe, and the inner peripheral surface of the gas pipe is damaged. May occur.
In particular, when the inner peripheral surface of the gas pipe is coated, there is a possibility that the painted surface may be damaged by friction with the partition wall.

  The present invention has been made in view of the above-described circumstances, and can easily discharge the gas staying in the gas pipe to the outside without being affected by the shape of the gas pipe and damaging the inner peripheral surface of the gas pipe. An object of the present invention is to provide a gas replacement method in a gas pipe and a gas replacement device in the gas pipe.

  In order to achieve the above object, a gas replacement method in a gas pipe according to the present invention is a gas replacement method in a gas pipe that discharges a gas staying in a predetermined section in the gas pipe and replaces it with another gas. A tube connecting step of connecting one end of a bag-like tube having an open portion and the other end closed to a first communication hole formed near one end of the predetermined section of the gas pipe; A tube insertion step of inserting a tube filling gas into the tube so that the tube is reversed and inserting the tube while reversing the tube from the first communication hole to a predetermined section in the gas pipe; and a predetermined section in the gas pipe The tube inserted and inverted is filled with the tube filling gas, the tube is expanded, and a predetermined inside of the gas pipe is formed from a second communication hole formed near the other end of the predetermined section of the gas pipe. A gas discharge process for discharging the gas staying between, characterized in that it comprises a step extraction tube taking out the tube to the outside of the gas pipe.

  Further, the gas replacement device in the gas pipe according to the present invention is a gas replacement device in the gas pipe that discharges the gas staying in a predetermined section in the gas pipe and replaces it with another gas, one end of which is opened and the other A tube-like tube connected to a first communicating hole formed in the vicinity of one end of the predetermined section of the gas pipe, and the tube is connected to the tube. The tube filling gas is introduced so as to be reversed, and the tube is inserted while being reversed from the first communication hole to a predetermined section in the gas pipe, and is inserted into the predetermined section in the gas pipe and the tube is filled into the reversed tube. A gas discharger that fills the gas and expands the tube to discharge the gas staying in the predetermined section in the gas pipe from the second communication hole formed near the other end of the predetermined section of the gas pipe When, characterized in that and a tube extraction means extracting the tube to the outside of the gas pipe.

In the present invention, the gas staying in the predetermined section in the gas pipe is inverted by inserting the tube into the predetermined section in the gas pipe from the first communication hole, filling the tube with the gas for filling the tube, and expanding the tube. Can be easily discharged from the second communication hole.
Since the tube expands after being inserted into a predetermined section in the gas pipe, it is not necessary to move the expanded tube in the gas pipe, and the operation can be simplified. In particular, when the gas pipe is bent or there is a step in the gas pipe, it is difficult to move the expanded tube, so that the operation can be simplified.
Further, since the expanded tube does not move in the gas pipe, it is possible to prevent the expanded tube from rubbing and damaging the inner peripheral surface of the gas pipe.

In the gas replacement method in the gas pipe according to the present invention, it is preferable that the other gas is filled into the gas pipe from the second communication hole in the tube removing step.
By doing so, the gas can be replaced simultaneously with taking out the tube and filling the gas pipe with another gas at the same time.

In the gas pipe gas replacement method according to the present invention, the other end of the tube is connected to a reel provided on the outside of the gas pipe via a cable body. It is preferable to wind up the cable body and the tube.
By doing in this way, the tube inserted in the gas pipe can be easily taken out of the gas pipe.

According to the present invention, the tube is inverted from the first communication hole and inserted into a predetermined section in the gas pipe, and the tube filling gas is filled in the tube and the tube is expanded to stay in the predetermined section in the gas pipe. The gas to be discharged can be easily discharged from the second communication hole.
Since the tube expands after being inserted into a predetermined section in the gas pipe, it is not necessary to move the expanded tube in the gas pipe, and the operation can be simplified. In particular, when the gas pipe is bent or there is a step in the gas pipe, it is difficult to move the expanded tube, so that the operation can be simplified.
Further, since the expanded tube does not move in the gas pipe, it is possible to prevent the expanded tube from rubbing and damaging the inner peripheral surface of the gas pipe.

(A) is a figure which shows an example of the gas substitution apparatus in a gas pipe by embodiment of this invention, (b) is a figure explaining a tube, (c) is the elements on larger scale of (a). It is a figure explaining a tube insertion process. It is a figure explaining a gas discharge process. It is a figure explaining a tube taking-out process. It is a figure explaining the gas pipe | tube with which gas was substituted.

Hereinafter, a gas replacement method in a gas pipe and a gas replacement apparatus in the gas pipe according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
(Gas replacement device)
As shown in FIG. 1A, the gas replacement device 1 according to the present embodiment is a gas pipe that is a construction target when performing a branching work of the gas pipe 10 or a work for exchanging a part of the gas pipe 10. It is used when the gas G1 staying in a predetermined section 10a in the gas 10 is discharged to the outside.

  Sealing materials 11 and 11 for blocking the flow of the gas G1 are installed at both end portions 10b and 10c in a predetermined section 10a of the gas pipe 10. The sealing materials 11 and 11 are formed in a bag shape with, for example, a stretchable material, and are inserted into the gas pipe 10 through holes (not shown) appropriately formed in the gas pipe 10, and air is sealed inside. The outer peripheral surface of the gas pipe 10 is in close contact with the inner peripheral surface 10d of the gas pipe 10.

Further, a first communication hole 12 is formed in the vicinity of one end 10 b of the predetermined section 10 a of the gas pipe 10, and a first communication pipe 13 protruding outward from the gas pipe 10 is formed in the first communication hole 12. It is connected. The inside and outside of the gas pipe 10 communicate with each other through the first communication pipe 13.
Further, a second communication hole 14 is formed in the vicinity of the other end 10 c of the predetermined section 10 a of the gas pipe 10, and a second communication pipe 15 protruding outward from the gas pipe 10 is formed in the second communication hole 14. It is connected. The inside and outside of the gas pipe 10 communicate with each other through the second communication pipe 15.

  In the gas replacement device 1 according to the present embodiment, the tube 2 connected to the first communication pipe 13 is inserted into the predetermined section 10a of the gas pipe 10 while the tube 2 is inverted, and the tube 2 is expanded to expand the predetermined of the gas pipe 10. A gas discharging means 3 for discharging the gas G1 staying in the section 10a to the outside and a tube taking-out means 4 for taking out the tube 2 in the gas pipe 10 to the outside are provided.

As shown in FIG. 1B, the tube 2 is made of a thin film resin having elasticity and flexibility, such as polyurethane, for example, and one end 2a is open and the other end 2b is closed. It is formed in a bag shape.
Further, the tube 2 is formed to have a length that is equal to or longer than the length of the predetermined section 10a of the gas pipe 10 and is configured to be reversible, and expands when the tube filling gas G2 is filled therein. It is configured to contract when the tube filling gas G2 is discharged.

  As shown in FIGS. 1 (a) and 1 (c), the tube 2 is fixed from the outside so that one end 2a is connected to the first communication pipe 13 and does not come off from the first communication pipe 13. It is fixed by a band 21.

Returning to FIG. 1 (a), the tube take-out means 4 includes the other end 2b (see FIG. 1 (b)) of the tube 2 connected via a cord (not shown). 2 is provided, and the reel 41 is accommodated in a casing 42 installed in the vicinity of the first communication pipe 13.
The tube take-out means 4 is configured such that the tube 2 inserted into the gas pipe 10 can be taken out of the gas pipe 10 by rotating the reel 41 to wind up the cable body and the tube 2. .

The housing 42 has a part of the first communication pipe 13 inserted therein, and the fixing band 21 for fixing the one end 2 a of the tube 2 and the tube 2 to the first communication pipe 13 is provided in the housing 42. It is arranged in.
Further, the housing 42 is formed with an exhaust hole 43 through which air in the housing 42 can be exhausted, and the exhaust hole 43 is configured to be openable and closable.

The gas discharge means 3 includes a gas cylinder 31 capable of supplying the tube filling gas G2 in the housing 42. When the gas cylinder 31 supplies the tube filling gas G2 into the housing 42, the pressure inside the housing 42 increases, and a force for pushing the tube 2 attached to the first communication pipe 13 into the gas pipe 10 is generated. . At this time, the exhaust hole 43 of the housing 42 is closed.
At this time, the tube 2 is inserted into the gas pipe 10 while being inverted as shown in FIG. 2 because the one open end 2a is fixed to the first communication pipe 13.
Here, the tube 2 has the first surface 2c as the outer peripheral surface before reversing and the second surface 2d as the inner peripheral surface, and the outer peripheral surface after reversing becomes the second surface 2d, and the inner peripheral surface is the first surface 2d. One surface 2c.

At this time, the gas cylinder 31 supplies the tube filling gas G <b> 2 into the housing 42, whereby the tube filling gas G <b> 2 is filled into the inverted tube 2 inserted into the gas tube 10, Tube 2 expands.
As a result, the gas G1 staying in the predetermined section 10a in the gas pipe 10 is discharged from the second communication pipe 15 to the outside of the gas pipe 10 via the second communication pipe 15.

(Gas replacement method)
Next, a gas replacement method in the gas pipe using the gas replacement device 1 described above will be described.
Here, a method of replacing the gas G1 staying in the predetermined section 10a in the gas pipe 10 with another gas G3 will be described.

(Tube connection process)
First, as shown in FIG. 1, the tube 2 is connected to the first communication pipe 13.
First, sealing materials 11 and 11 for preventing the flow of the gas G1 inside and outside the predetermined section 10a are installed in the vicinity of both end portions 10b and 10c in the predetermined section 10a of the gas pipe 10, respectively.
Next, the first communication hole 12 is drilled in the vicinity of one end 10 b of the predetermined section 10 a of the gas pipe 10, and the first communication pipe 13 is connected to the first communication hole 12. Further, the second communication hole 14 is drilled in the vicinity of the other end 10 c of the predetermined section 10 a of the gas pipe 10, and the second communication pipe 15 is connected to the second communication hole 14.
Next, one end 2 a of the tube 2 is connected to the first communication pipe 13. And the housing | casing 42 which accommodated the reel 41 around which the tube 2 was wound, and the 1st communicating pipe 13 are connected.

(Tube insertion process / gas discharge process)
Subsequently, the tube 2 is inserted into the predetermined section 10 a in the gas pipe 10 and expanded to discharge the gas G 1 staying in the gas pipe 10.
First, as shown in FIG. 2, the tube filling gas G <b> 2 is supplied from the gas cylinder 31 into the housing 42. At this time, the exhaust hole 43 of the housing 42 is closed.
As a result, the casing 42 is filled with the tube filling gas G2 and the internal pressure is increased, and the tube 2 in the casing 42 is unwound from the reel 41 and pushed out into the gas pipe 10 while being inverted, thereby being gas pipe 10 Insert inside.

Further, the tube filling gas G2 is further supplied from the gas cylinder 31 into the casing 42, and the tube filling gas G2 is filled into the inverted tube 2 inserted into the gas pipe 10 and expanded.
Then, as shown in FIG. 3, the tube 2 is inserted into the predetermined section 10 a of the gas pipe 10 and the tube 2 expands, so that it stays in the predetermined section 10 a in the gas pipe 10 from the second communication pipe 15. The gas G1 (see FIG. 2) that has been discharged is discharged to the outside.

(Tube removal process / gas replacement process)
Subsequently, the tube 2 in the gas pipe 10 is taken out and the predetermined section 10a in the gas pipe 10 is filled with another gas G3. First, the supply of the tube filling gas G2 from the gas cylinder 31 to the housing 42 is stopped. At the same time, the exhaust hole 43 of the housing 42 is opened so that the tube filling gas G2 in the housing 42 can be discharged to the outside.
As a result, as shown in FIG. 4, the internal pressure due to the tube filling gas G2 in the tube 2 is reduced, and the tube filling gas G2 in the tube 2 is discharged from the one end 2a side of the tube 2 and the housing. It is discharged to the outside of the housing 42 through 42. Thereby, the tube 2 contracts.

  Then, the reel 41 of the tube take-out means 4 is rotated to take up the tube 2, and the tube 2 inserted into the gas pipe 10 is taken out of the gas pipe 10. When the other end 2b (see FIG. 1B) of the tube 2 is inserted into the gas pipe 10, the reel 41 is rotated to wind up the cable body and the tube 2.

At this time, a step of taking out the tube 2 and a step of filling the predetermined section 10a in the gas pipe 10 with another gas G3 from the second communication pipe 15 are performed.
Thereby, the tube 2 is taken out from the predetermined section 10a of the gas pipe 10, and a new gas G3 is filled in the predetermined section 10a.
And after taking out the tube 2, as shown in FIG. 5, the sealing materials 11 and 11 are removed as needed. Moreover, the housing | casing 42 and the reel 41 are removed as needed, and the 1st communicating hole 12 and the 2nd communicating hole 14 are plugged up.

Next, the effects of the gas replacement method in the gas pipe and the gas replacement device in the gas pipe will be described with reference to the drawings.
According to the gas replacement method in the gas pipe and the gas replacement apparatus 1 in the gas pipe according to the present embodiment, the tube 2 is inverted from the first communication pipe 13 and inserted into the predetermined section 10 a in the gas pipe 10. By filling the tube filling gas G2 to expand the tube 2, the gas G1 staying in the predetermined section 10a in the gas pipe 10 can be easily discharged from the second communication pipe 15.

And since the tube 2 expand | swells after being inserted in the predetermined area 10a in the gas pipe 10, it is not necessary to move the tube 2 of the expanded state in the gas pipe 10, and can perform an operation | work easily. In particular, when the gas pipe 10 is bent or there is a step in the gas pipe 10, the expanded tube 2 is difficult to move, and therefore the operation can be simplified.
Further, since the expanded tube 2 does not move in the gas pipe 10, it is possible to prevent the expanded tube 2 from rubbing and damaging the inner peripheral surface 10d of the gas pipe 10.

Further, since the tube 2 is connected to a reel 41 provided outside the gas pipe 10, the tube 2 inserted into the gas pipe 10 can be easily moved outside the gas pipe 10 by rotating the reel 41. Can be taken out.
In addition, since the tube 2 is taken out from the gas pipe 10 and another gas G3 is filled into the gas pipe 10, gas replacement in the gas pipe can be performed efficiently.

Although the embodiments of the gas replacement method in the gas pipe and the gas replacement apparatus in the gas pipe according to the present invention have been described above, the present invention is not limited to the above-described embodiments and may be appropriately changed without departing from the scope of the present invention. Is possible.
For example, in the above-described embodiment, the tube 2 is taken out from the gas pipe 10 and another gas G3 is filled into the gas pipe 10 from the second communication hole 14 in the tube taking-out step. When it is not necessary to fill the other gas G3, the step of filling the other gas G3 may be omitted. Further, after the collection of the tube 2 is completed, a step of filling the gas pipe 10 with another gas G3 may be performed.
In the embodiment described above, the tube 2 inserted into the gas pipe 10 is wound up by the reel 41. However, the tube take-out means 4 for taking out the tube 2 from the gas pipe 10 may be configured to include components other than the reel 41. Good.
In the above-described embodiment, the tube 2 is formed of a stretchable thin film resin such as polyurethane. However, the tube 2 may be formed of a non-stretchable material instead of the stretchable material. Good.

DESCRIPTION OF SYMBOLS 1 Gas replacement apparatus 2 Tube 2a One end part 2b The other end part 3 Gas discharge | emission means 4 Tube extraction means 10 Gas pipe 10a Predetermined section 10b One end part 10c The other end part 10d Inner peripheral surface 12 1st communicating hole 13 1st communication pipe 14 2nd communication hole 15 2nd communication pipe 41 Reel 42 Case 43 Exhaust hole G1, G3 gas G2 Tube filling gas

Claims (4)

A gas replacement method in a gas pipe for discharging a gas staying in a predetermined section in the gas pipe and replacing it with another gas,
A tube that connects one end of a bag-like tube having one end opened and the other end closed to a first communication hole formed in the vicinity of one end of the predetermined section of the gas pipe. Connection process;
A tube insertion step of inserting a tube filling gas into the tube so that the tube is inverted and inserting the tube while inverting the tube from the first communication hole to a predetermined section in the gas pipe;
From the second communication hole formed near the other end of the predetermined section of the gas pipe by filling the tube filling gas inserted into the predetermined section in the gas pipe and inverting the tube, and expanding the tube. A gas discharge step for discharging the gas staying in a predetermined section in the gas pipe;
And a tube removing step for taking out the tube to the outside of the gas tube.   2. The gas replacement method in a gas pipe according to claim 1, wherein in the tube take-out step, the other gas is filled into the gas pipe from the second communication hole.   The other end of the tube is connected to a reel provided outside the gas pipe via a cable body, and the cable body and the tube are wound up by the reel in the tube take-out step. The gas replacement method in a gas pipe according to claim 1 or 2. A gas replacement device in a gas pipe for discharging a gas staying in a predetermined section in the gas pipe and replacing it with another gas,
One end is opened, the other end is closed, and the one end is connected to a first communication hole formed near one end of a predetermined section of the gas pipe. When,
The tube filling gas is caused to flow into the tube so that the tube is reversed, and the tube is inserted while being reversed from the first communication hole to a predetermined section in the gas pipe, and is inserted into the predetermined section in the gas pipe and reversed. The tube is filled with the tube filling gas, and the tube is expanded to discharge the gas staying in the predetermined section in the gas pipe from the second communication hole formed near the other end of the predetermined section of the gas pipe. Gas exhausting means,
And a tube take-out means for taking out the tube to the outside of the gas pipe.

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