JP3572294B2 - Bag introduction guide pipe and pipe cutoff method - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention is intended to cut off the flow of gas, water, etc. in a pipeline when gas leakage occurs in a gas main pipe, which is an existing pipe buried underground, or when water leaks in a water pipe. The present invention relates to a guide pipe for introducing a bag used in the existing pipe into an existing pipe, and a pipe blocking method using the guide pipe.
[0002]
[Prior art]
When gas leaks from the gas mains buried underground or when repairing the gas mains, the bag is sent into the gas mains and the bag is inflated to reduce the gas in the gas mains. There is a pipeline blocking method for closing a pipeline and partially blocking gas flow.
[0003]
FIG. 7 is a view showing a conventional pipeline blocking device used in this pipeline blocking method. In FIG. 7, A is a gas main buried underground, X is a line cutoff position for blocking gas flow in the gas main A, G is the ground, and H is a gas main excavating the ground G. A working hole reaching D and D3 is a working hole width indicating the size of the working hole H. Reference numeral 41 denotes a conventional guide tube, which has a bag entrance 42 and a guide surface 43 at the tip. Inside the guide tube 41, a bag B and a tube T for feeding gas from a fluid supply source P such as a pump into the bag B are inserted, and a sealing cap 44 having the tube T penetrated is inserted into the rear end of the guide tube 41. , The bag B and the tube T are supported in the guide tube 41. A front end socket S1 is attached to the front end of the bag B, and a rear end socket S2 is attached to the rear end. The bag B and the tube T are connected by the rear end socket S2. A sealing member 45a is interposed between the sealing cap 44 and the tube T, and a sealing member 45b is interposed between the sealing cap 44 and the guide tube 41. Keeps the nature. Reference numeral 46 denotes a perforation device, which is provided with a perforation member 47 at the tip thereof, and drives the perforation member 47 to form a gas passage exclusive perforation 48 for blocking gas flow in the gas main pipe A. Reference numeral 49 denotes a launcher attached to the gas main pipe A, which includes a launcher body 50, a base 51 for fixing the launcher 49 to the gas main pipe A by the mounting device 54, and a guide pipe insertion section 52 for inserting the guide pipe 41. And a punching device supporting portion 53 that supports the punching device 46 so as to be movable up and down. The guide tube insertion part 52 is inserted into the launcher main body 50 so that the guide tube 41 can be inserted obliquely with respect to the axial direction of the gas main pipe A and the bag B can be sent out toward the pipe line blocking position X. It is formed inclined. In the launcher 49, a seal member 45c is interposed between the base portion 51 and the gas main pipe A, and a seal member 45d is interposed between the guide tube insertion portion 52 and the guide tube 41 at the upper end. A seal member 45e and a seal member 45f are interposed between the upper end and the lower end of the support portion 53 and the perforation device 46, respectively, so that the gas tightness at the time of perforating the gas main pipe A and at the time of inserting the bag B is obtained. Is kept.
[0004]
Next, a pipe line blocking method using the above-described pipe line blocking device will be described. The ground G near the pipeline cutoff position X is excavated to form a working hole H reaching the gas main pipe A. The launcher 49 is lowered from the working hole H to the gas main pipe A, and the base 51 is fixed to the upper part of the gas main pipe A by the mounting device 54, and the launcher 49 is mounted. Then, the perforating device 46 supported by the perforating device supporting portion 53 is lowered to the gas main pipe A, and the gas main pipe A is provided with the perforated line exclusive perforation 48 by the perforating member 47. After the pipe-cutting-dedicated perforation 48 is performed, the perforation device 46 is lifted to the perforation device support portion 53.
[0005]
Next, the bag B and the tube T connected to the rear end of the bag B are inserted into the guide tube 41, and the sealing cap 44 is attached to support the tube B in the guide tube 41. Then, the guide pipe 41 is inserted into the gas main pipe A from the guide pipe insertion portion 52 of the launcher 49 in a direction oblique with respect to the axial direction of the gas main pipe A through the pipe cut-off hole 48 dedicated to channel blocking. Further, by pushing the tube T protruding from the rear end of the guide tube 41 into the guide tube 41, the bag B and the tube T in the guide tube 41 are guided by the guide surface 43, and the gas main tube A from the bag entrance 42. It is sent out to the pipeline cutoff position X inside.
[0006]
Thereafter, the gas is sent from the fluid supply source P into the bag B through the tube T, and the bag B is inflated at the line shutoff position X to close the gas main pipe A and cut off the gas flow. FIG. 8 is a diagram showing a pipeline cutoff state in which the bag B is inflated at the pipeline cutoff position X to block the gas flow in the gas main pipe A.
[0007]
[Problems to be solved by the invention]
However, in the above-mentioned conventional pipeline shut-off method, in order to send out the bag B to the pipeline shut-off position X in the gas main A, the guide pipe 41 is directed toward the pipeline shut-off position X in the axial direction of the gas main A. Therefore, the gas main pipe A must be provided with a pipe-cutting exclusive hole 48 having a diameter larger than the diameter of the guide pipe 41. For this reason, a large-scale device such as the perforation device 46 and a launcher 49 for supporting the perforation device is required. There is a problem that it takes time to shut off the gas. Such a time-consuming operation is a serious problem particularly when urgency is required to shut off the gas. Also, when inserting the guide tube 41 into the guide tube insertion portion 52, the guide tube 41 is inclined, so that the rear end of the guide tube 41 does not interfere with the side surface of the work hole H so that the work hole shown in FIG. It is necessary to excavate a large working hole H such as the width D3, and there is a problem that the excavation operation takes time. Further, there is also a problem that gas shutoff cannot be performed in a place where the working hole H cannot be largely excavated, such as in an area where buildings are densely arranged.
[0008]
The present invention is intended to solve the above-described problems, and the object thereof is to perform work in a relatively narrow work range without performing large-diameter drilling on an existing pipe such as a gas main pipe, An object of the present invention is to provide a bag introduction guide tube and a pipe line blocking method capable of reducing the number of working steps and shortening the working time.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, a bag introduction guide tube according to the present invention includes a guide tube main body portion into which a bag is inserted, a bending portion that is formed in the guide tube main body portion that can be bent and deformed, and a distal end of the bending portion. And a formed guide portion.
[0010]
In the above-mentioned bag introduction guide tube, the guide portion is a tapered guide portion, and when the guide tube body is vertically inserted into the existing tube, the guide portion comes into contact with the inner wall of the existing tube and the bending portion is parallel to the axial direction of the existing tube. Turn in a predetermined direction.
[0011]
By doing so, the guide tube main body is inserted perpendicularly to the axial direction of the existing pipe, the tip of the guide pipe main body is parallel to the axial direction of the existing pipe, and there is a pipe line blocking position. The bag can be introduced into the existing pipe at a line blocking position in the existing pipe. Since the guide tube main body is inserted perpendicularly to the axial direction of the existing tube, it is not necessary to make a large-diameter hole in the existing tube, so that the operation time of the drilling operation can be reduced. In addition, it is not necessary to form a large working hole for the working hole in consideration of the guide tube main body interfering with the working hole. Can be.
[0012]
Further, in the bag introduction guide tube according to the present invention, it is preferable that the bending portion is a cut portion formed by a plurality of grooves formed by cutting the side surface of the guide tube main body from one direction. With this configuration, the guide tube main body has a property that it is easily bent and deformed when the cut portion is on the inside, and hardly deforms when the cut portion is on the outside. And when inserting the guide tube main body perpendicularly to the axial direction of the existing pipe, the notch is inserted in the direction of the pipe line blocking position, so that the guide pipe main body can be inserted without applying excessive force. The tip of the portion can be easily turned in the direction of the line blocking position.
[0013]
Further, in the bag introduction guide tube according to the present invention, it is preferable that the guide portion is a cut-off portion such that the tip of the guide tube main body is tapered toward the cut portion. By doing so, when inserting the guide pipe main body perpendicularly to the axial direction of the existing pipe, the cut side of the cut-off portion first contacts the inner wall of the existing pipe. When pushed in, the cut-off portion is always inclined toward the cut portion, and the guide tube main body can be easily bent and deformed with the cut portion inside.
[0014]
Further, in the bag introduction guide tube according to the present invention, it is preferable that the guide portion has a curved surface shape that can slide along the inner wall of the existing tube. By doing so, the frictional force between the inner wall of the existing pipe and the guide section is reduced, the guide pipe main body is inserted into the existing pipe without applying excessive force, and the tip of the guide pipe main body is removed. It is possible to surely change the direction in the direction where the line blocking position in the existing pipe exists.
[0015]
Further, in the bag introduction guide tube according to the present invention, the guide tube main body portion is bent and deformed when pressed against the inner wall of the existing tube, and is normally straight when not pressed against the inner wall of the existing tube. It is preferable to use a flexible material capable of returning to a state. By doing so, when inserting the guide tube main body into the existing pipe, the tip of the guide pipe main body can be easily turned without applying excessive force, and the guide pipe main body can be inserted into the existing pipe. When the guide tube is removed from the guide tube, the guide tube main body can be pulled up without being caught by a hole or the like.
[0016]
Further, in the pipe line blocking method using the bag introduction guide tube according to the present invention, a part of the bag and the tube are supported in the guide tube main body, and the guide tube main body is inserted into the existing pipe from the perforation formed in the existing pipe. After inserting the guide perpendicular to the axial direction of the existing pipe, bringing the guide portion into contact with the inner wall of the existing pipe, and changing the bending portion in a predetermined direction parallel to the axial direction of the existing pipe, The tube is pushed in to introduce the bag from the guide tube main body to a predetermined position in the existing tube, and gas is sent from the other end of the tube to inflate the bag and cut off the flow of fluid in the existing tube.
[0017]
By doing so, the guide pipe main body is inserted perpendicularly to the axial direction of the existing pipe without making a large-diameter hole in the existing pipe, and the tip of the guide pipe main body is inserted in the axial direction of the existing pipe. The bag can be introduced into the existing pipe in the pipe-cutting position by turning in a direction parallel to the pipe-cutting position. In addition, a large-scale device such as a punching device or a launcher for inserting the guide tube main body is not required, so that the number of steps for mounting and drilling these devices can be reduced, and the working time can be shortened.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a bag introduction guide tube 100 according to the present invention. In FIG. 1, reference numeral 1 denotes a hollow guide tube main body made of a polycarbonate resin, 2 denotes a notch formed by a plurality of grooves 21 formed by cutting a side surface of the guide tube main body 1 from one direction, and 3 denotes a guide tube main body. A cut-off portion 1 is cut into a curved surface so that the tip of the cut-off portion 2 is tapered toward the cut side of the cut portion 2, and 4 is a rear end portion of the guide tube main body 1. The cut portion 2 forms one form of a bending portion in the present invention, and the cutout portion 3 forms one form of a guide portion in the present invention.
[0019]
Since the guide tube main body 1 is formed of polycarbonate resin, it has flexibility while having a certain rigidity, can bend when an external force is applied, and returns to a normal straight state when the external force is removed. Can be. Since the cut portion 2 is cut at a plurality of positions from one direction with respect to the side surface of the guide tube main body 1, when the guide tube main body 1 is bent and deformed, the cut portion 2 is easily bent and deformed when the cut portion 2 is set inside. When the portion 2 is located outside, it has a property that it is difficult to bend and deform. Since the cut-off portion 3 is formed so that the tip of the guide tube main portion 1 is tapered toward the cut side of the cut portion 2, the guide tube main portion 1 is inserted into the gas main pipe A to guide the cut-off portion 3. When the guide tube body 1 is further pushed in after the front end of the tube body 1 is brought into contact with the inner wall of the gas main pipe A from the vertical direction, the cut-off portion 3 always tilts toward the notch portion 2 and the guide tube body portion 1 can easily bend and deform with the cut portion 2 inside. Further, since the cut-off portion 3 is formed in a curved shape, when the cut-off portion 3 comes into contact with the gas main pipe A, the frictional force between the gas main pipe A and the cut-off section 3 is reduced, and the cut-off section 3 is formed. 3 can make the surface of the gas main pipe A slippery.
[0020]
FIG. 2 is a diagram showing the steps of the pipe line blocking method according to the present invention using the bag introduction guide tube 100. In FIG. 2, reference numeral 100 denotes a bag introduction guide tube, which is provided with the guide tube main body 1, the cutout portion 2, the cutout portion 3, and the rear end portion 4 described in FIG. 1. A is a gas main pipe buried in the ground, W is an inner wall of the gas main pipe, and X is a pipe cutoff position for blocking gas flow in the gas main pipe A. B is a bag, and T is a tube for sending gas into the bag B. A front end socket S1 is attached to the front end of the bag B, and a rear end socket S2 is mounted at the rear end. Are concatenated. The other end of the tube T is connected to a fluid supply source P such as a pump for supplying gas to be sent to the bag B. Reference numeral 5 denotes a sealing cap, and a seal member 6a is interposed between the tube T and the seal member 6a and a bag introduction guide tube 100 to maintain gas tightness. Reference numeral 7 denotes a duct for inserting the guide tube main body 1 without dissipating gas to the outside. A seal member 6c is interposed between the guide tube main body 1 and the inside of the duct opening 8 on the upper surface. To maintain gas tightness. Reference numeral 9 denotes an existing gas emission port provided in the gas main pipe A, in which a perforation 14 communicating with the inside of the gas main pipe A is provided. Reference numeral 10 denotes a gas release valve, which turns the open / close lever 11 and opens the open / close valve 12 provided inside to discharge gas in the gas main pipe A to the outside. A gas release valve 10 is connected to the upper part of the gas discharge port 9 by a connecting member 13a, and the duct 7 is connected to the upper part of the gas discharge valve 10 by a connecting member 13b.
[0021]
Next, the steps of the pipeline blocking method will be described with reference to FIG. In (a), the bag B to which the tube T is connected is inserted into the bag introduction guide tube 100, and the sealing cap 5 having the tube T penetrated is attached to the rear end 4 of the bag introduction guide tube 100. As a result, the bag B and the tube T are supported in the bag introduction guide tube 100. Then, the bag introduction guide tube 100 is inserted into the duct 7 connected to the gas diffusion valve 10 provided on the gas main pipe A from the duct port 8. As shown in (b), in the bag introduction guide tube 100 inserted into the duct 7, the cut portions 2 are all housed in the duct 7, and are interposed between the guide tube main body 1 and the duct opening 8. The hermeticity is maintained by the sealing member 6c.
[0022]
Thereafter, the on / off lever 11 of the gas release valve 10 is turned to open the on / off valve 12 provided therein, and the guide pipe main body 1 is inserted into the gas main pipe A perpendicularly to the axial direction of the gas main pipe A. To go. At this time, the guide tube main body 1 is inserted so that the cut portion 2 of the bag introduction guide tube 100 faces the direction of the line blocking position X. When the distal end of the guide tube main body 1 contacts the gas main pipe inner wall W, the cut-off portion 3 has a tapered shape toward the cut portion 2 side, and as shown in FIG. The tip of 1 is bent toward the cut 2 side. Further, when the guide tube main body 1 is inserted, the cut-off portion 3 slides along the inner wall W of the gas main pipe, and the grooves of the cut portions 2 contract as shown in FIG. The guide tube main body 1 is bent and deformed with. Then, the insertion direction of the distal end of the guide pipe main body 1 is changed to a direction parallel to the axial direction of the gas main pipe A and in a direction of the pipe line blocking position X.
[0023]
Thereafter, the tube T behind the sealing cap 5 is pushed into the guide tube main body 1, and the bag B is introduced from the guide tube main body 1 to the pipe line blocking position X. Then, gas is sent into the bag B from the fluid supply source P connected to the other end of the tube T, and the gas in the gas main pipe A is shut off by inflating the bag B as shown in FIG.
[0024]
When the bag B is collected, the gas in the bag B is sucked by the fluid supply source P to shrink the bag B, the tube T behind the sealing cap 5 is pulled, and the bag B is moved into the guide tube main body 1. To store. Then, the guide tube main body 1 is pulled up, and all the cuts 2 are housed in the duct 7. At this time, since the guide tube main body 1 is formed of polycarbonate resin, when the force pressed against the inner wall W of the gas main pipe is released by pulling up the guide tube main body 1, the curved guide is deformed. The pipe main body 1 returns to the normal straight state, and can be pulled up without the guide pipe main body 1 being caught in the perforation 14. Thereafter, the opening / closing lever 11 of the gas emission valve 10 is turned to close the opening / closing valve 12, then the guide tube main body 1 is pulled out of the duct 7, and the bag B is taken out of the guide tube main body 1.
[0025]
By doing so, the guide pipe main body 1 is inserted perpendicularly to the axial direction of the gas main pipe A from the perforation 14 inside the gas emission port 9 already provided in the gas main pipe A, The bag B can be introduced into the pipeline shutoff position X and inflated to shut off the gas flow in the gas main pipe A. Further, it is not necessary to make a gas passage dedicated perforation larger than the diameter of the bag introduction guide tube 100 on the gas main pipe A, and a device such as a perforation device or a launcher is not required. It is possible to reduce the number of work steps of the mounting work and the drilling work of these devices, and shorten the work time.
[0026]
FIG. 3 is a diagram showing an application example of the pipe line blocking method according to the present invention. In FIG. 3, C is a concrete wall, M is a manhole in which the gas emission valve 10 is provided, and D1 is a hole diameter of the manhole M. Other reference numerals are the same as those described with reference to FIGS. Further, the steps of the pipeline blocking method are the same as those described in FIG. Generally, the gas discharge port 9 and the gas discharge valve 10 connected to the gas discharge port 9 are provided in a manhole M reaching the gas main pipe A. The manhole M is surrounded by a concrete wall C and has a narrow hole diameter D1. It has become. Even in the working range of such a narrow hole diameter D1, the guide pipe main body 1 is inserted perpendicularly to the axial direction of the gas main pipe A from the perforation 14 inside the gas vent 9 in the manhole M, The bag B can be introduced into the pipeline shutoff position X and inflated to shut off the gas flow in the gas main pipe A. Further, the excavation work for newly digging the ground and forming a work hole reaching the gas main pipe A becomes unnecessary, and the work time can be reduced.
[0027]
FIG. 4 is a diagram showing another application example of the pipe line blocking method according to the present invention. In FIG. 4, G is the ground, H is a work hole that excavates the ground G and reaches the gas main pipe A, and D2 is a work hole width indicating the size of the work hole H. Other reference numerals are the same as those described with reference to FIGS. The steps of the gas shut-off method are the same as those described with reference to FIG. Generally, the gas emission port 9 and the gas emission valve 10 are provided in the manhole M reaching the gas main pipe A as shown in FIG. 3, but in the present embodiment, they are embedded in the ground. This is the case. When the gas vent 9 and the gas vent 10 are buried in the ground, the ground G must be excavated to form the working hole H. However, since the guide tube main body 1 is inserted perpendicularly to the axial direction of the gas main pipe A without being inserted obliquely to the axial direction of the gas main pipe A, the guide pipe main body 1 is The working hole width D2 of the working hole H can be made small without interfering with H, and the working time required for excavation work can be reduced.
[0028]
In the embodiment described above, the bag introduction guide tube 100 is inserted into the gas main pipe A from the perforation 14 inside the gas discharge port 9 already formed in the gas main pipe A, and the bag B is introduced to introduce the gas main pipe. Although the case where the flow of gas in the pipe A is interrupted has been described as an example, the present invention provides the gas main pipe A with a hole for exclusive use of line shutoff at the time of gas shutoff, and the gas The present invention can also be applied to a case where the bag introduction guide tube 100 is inserted into the tube A and the bag B is introduced to shut off the gas in the gas main tube A.
[0029]
Further, in the above-described embodiment, the cut portion 2 of the bag introduction guide tube 100 is one form of the bent portion in the present invention. However, the present invention is not limited to this, and the bent portion is provided with a bellows as shown in FIG. It may be formed in a shape. In this way, when the tip of the guide tube main body 1 is brought into contact with the inner wall W of the gas main pipe, the bellows portion 15a on the tapered side of the cut-off portion 3 is turned inside, and the bellows portion 15 is bent. The main body 1 can be bent and deformed.
[0030]
Further, in the above embodiment, the cut-off portion 3 obtained by cutting the guide tube main body portion 1 of the bag introduction guide tube 100 into a curved shape is one form of the guide portion in the present invention, but the present invention is not limited to this. Instead, as shown in FIG. 6, a guide member 16 having a tapered tip on one side and having a curved surface shape is formed separately from the bag introduction guide tube 100, and is attached to the tip of the guide tube main body 1. May be.
[0031]
Further, in the above embodiment, the cut-off portion 3 of the bag introduction guide tube 100 is formed in a curved shape. However, the present invention is not limited to this, and the cut-off portion 3 may be chamfered in multiple stages, For example, the cut-off surface may be mirror-finished to reduce the frictional force between the inner wall of the gas main pipe A and the cut-off portion.
[0032]
In the above embodiment, the guide tube main body 1 is made of polycarbonate resin. However, other materials such as resin materials such as vinyl chloride resin and polyethylene resin, aluminum, stainless steel, soft iron, and phosphor bronze for springs are also used. A flexible material such as a metal material may be used.
[0033]
Furthermore, in the above embodiment, the case where the flow of gas in the gas pipe is interrupted is taken as an example. However, the present invention is also applicable to the case where the flow of water flowing through a water pipe is interrupted. .
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, a bag can be introduce | transduced in the predetermined position in a gas main pipe, without perforating a gas main pipe with a large diameter. For this reason, a large-scale device such as a punching device or a launcher is not required, and the pipeline cutoff device can be simplified, and the work process of mounting and drilling these devices is reduced, thereby shortening the working time. Becomes possible. Further, the working range of the working hole and the like can be narrowed, and the working time for forming the working hole can be shortened.
[Brief description of the drawings]
FIG. 1 is a perspective view of a bag introduction guide tube according to the present invention.
FIG. 2 is a diagram showing steps of a pipeline blocking method according to the present invention.
FIG. 3 is a view showing another application example of the pipeline blocking method according to the present invention.
FIG. 4 is a diagram showing an example of application of a pipeline blocking method according to the present invention.
FIG. 5 is a view showing another example of the bag introduction guide tube according to the present invention.
FIG. 6 is a view showing another example of the bag introduction guide tube according to the present invention.
FIG. 7 is a view showing a conventional pipeline blocking device.
FIG. 8 is a view showing a state in which a pipeline is cut off by a conventional pipeline blocking method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Guide pipe main body part 2 Cut part 3 Cut off part 9 Gas emission port 14 Perforation 15 Bellows part 16 Guide member 100 Bag introduction guide pipe A Gas main pipe A
B Bag T Tube W Gas main pipe inner wall X Pipe cutoff position

Claims (6)

A bag that blocks the flow of fluid in the existing pipe by being inserted into the existing pipe buried underground, and a tube that is connected to the bag at one end and is a gas flow path that expands and contracts the bag. A bag introduction guide tube to be introduced into the existing tube,
A guide tube main body into which the bag is inserted, a bending portion capable of bending deformation formed in the guide tube main body, and a guide portion formed at a tip of the bending portion;
A taper that, when the guide portion is vertically inserted into the existing pipe, contacts the inner wall of the existing pipe and changes the direction of the bending portion in a predetermined direction parallel to the axial direction of the existing pipe; A bag introduction guide tube, characterized in that the guide tube is shaped like a letter. The bag introduction guide tube according to claim 1,
The bag introduction guide tube, wherein the bending portion is formed by a cut portion formed by a plurality of grooves formed by cutting a side surface of the guide tube main body from one direction. The bag introduction guide tube according to claim 2,
The guide tube according to claim 1, wherein the guide portion comprises a cut-off portion such that a tip of the guide tube body portion is tapered toward the cut portion. The bag introduction guide tube according to any one of claims 1 to 3,
The said guide part has a curved surface shape which can slide along the inner wall of the said existing pipe, The bag introduction guide pipe characterized by the above-mentioned. In the bag introduction guide tube according to any one of claims 1 to 4,
When the guide tube main body is pressed against the inner wall of the existing pipe, the bending portion is bent and deformed, and when not pressed against the inner wall of the existing pipe, the flexible portion can return to a normal straight state. A bag introduction guide tube made of a material having a property. A pipeline blocking method using the bag introduction guide tube according to any one of claims 1 to 5,
The bag and a part of the tube are supported in the guide tube main body, and the guide tube main body is inserted perpendicularly to the axial direction of the existing pipe from a perforation made in the existing pipe into the existing pipe. Then, the guide portion is brought into contact with the inner wall of the existing pipe, the bending portion is turned in a predetermined direction parallel to the axial direction of the existing pipe, and then the tube is pushed in to guide the bag. Introducing a gas from the inside of the tube body to a predetermined position in the existing tube, injecting gas from the other end of the tube to inflate the bag, and cutting off the flow of the fluid in the existing tube; .

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