KR102242447B1 - Method for repairing and reinforcing fire prevention underground pipe using non combustible gas and non combustible gas conversion supply unit - Google Patents

Abstract

The present invention relates to a non-excavation photocurable method for total repair to prevent fire by using non-combustible gas and a device for converting and supplying noncombustible gas, wherein an underground duct is lined with a tube liner impregnated with photocurable resin before being cured by the irradiation of light for repair and reinforcement. Furthermore, the inside of the tube liner is constructed in a noncombustible condition to prevent the cause of ignition during the curing process by means of the irradiation of light. The inside of the tube liner is constructed in a noncombustible condition so as to prevent fire even when the cause of ignition is generated. To this end, the non-excavation photocurable method for total repair to prevent fire by using non-combustible gas according to the present invention comprises: a first step of installing a tube liner within an underground duct; a second step of converting gas to prepare noncombustible gas for fire prevention; a third step of expanding the tube liner to line the inner wall of the duct; a fourth step of injecting the gas for fire prevention prepared in the second step; a fifth step of moving a light irradiation curing device along the inside of the tube liner to cure the tube liner in a state in which the inside of the tube liner is filled with the gas for fire prevention in the fourth step; and a sixth step of ejecting the light irradiation curing device to the outside of the tube liner after the tube liner is completely cured. Here, in the second step, the gas is converted after the oxygen concentration is adjusted to prevent ignition, whereas, in the fourth step, the gas for fire prevention converted in the second step is injected in the tube liner to prevent ignition during the curing of the light irradiation curing device, thereby preventing fire.

Description

Fire protection type non-excavation total repair using non-combustible gas Light curing method and non-combustible gas conversion supply device {METHOD FOR REPAIRING AND REINFORCING FIRE PREVENTION UNDERGROUND PIPE USING NON COMBUSTIBLE GAS AND NON COMBUSTIBLE GAS CONVERSION SUPPLY UNIT}

The present invention relates to a non-excavation total repair photo-curing method, and more particularly, a non-combustible gas that blocks the occurrence of fire in the process of curing a tube liner lined in an underground pipeline with light of a light irradiation curing device. It relates to a fire protection type non-excavation total repair photo-curing method and a non-combustible gas conversion and supply device using.

This part provides background information related to the content of the present application, and is not necessarily prior art.

In general, a pipe is a pipe for moving drinking water (water pipe), sewage (sewer pipe), rainwater (rainwater), sewage, etc., and is a structure buried and installed in the basement.

These pipes are buried for a long time and become obsolete, or cracks are generated due to ground subsidence or ground behavior, and fluid leakage and penetration of groundwater through the cracks require repair and replacement of the pipes. Since cost and time are consumed, a method of repairing a pipe instead of replacing a pipe by excavation has been mainly developed and used.

As a conventional pipe repair method, there is a non-excavated pipe repair method.

This non-drilling pipe repair method involves inserting a tube liner (repair tube) (hardened resin impregnated) into the pipe to be repaired, and then expanding the tube liner so that it adheres to the inner wall of the pipe, and the tube liner is a medium for curing the cured resin. The furnace is to regenerate the pipe by hardening the tube liner on the inner wall of the pipe by blowing light (UV, etc.) or heat.

Such a method of repairing a non-drilling pipe is classified into a photo-curing type or a thermal curing type according to the type of curing resin.

Since the thermal curing method is a long-term curing method that cures for a relatively long period of time (several hours) during heat curing, the monomer of the curing resin is volatilized during the curing period by heating, resulting in a large loss of material. Since the polymer is expanded at a high temperature, it shrinks during the cooling process, so the shrinkage rate of the curing tube is very high. Eventually, the structure of the tube liner is not dense, and there is a construction defect that creates a gap between the existing pipe line.

On the other hand, the photocuring method is an instant curing method that takes only a few seconds to a few minutes, and since the oligomer and the monomer are combined to form a polymer, there is no loss of the photocurable resin raw material, and thus the shrinkage of the cured tube generated after photocuring is very small.

In addition, since it is difficult to store the thermosetting tube liner at room temperature at the construction site, it requires a frozen transportation process, so it is inconvenient to immediately transport after impregnation at the production plant according to the construction length, whereas the photocurable tube liner is at room temperature when only blocking external light. Long-term storage for up to 6 months is possible, so after loading the continuous produced long tube liner into the loading box and transporting it to the construction site, it is advantageous in handling that it is towed by the target length in each construction section, then cut and used, and the rest is sealed and stored. have.

In this way, through the advantages of construction and handling, photo-curing tube liners and pipe rehabilitation using the same are preferred.

The technology using a photocurable tube liner essentially uses a light irradiation device that irradiates light. For example, Patent No. 10-1383855 enters the inside of a photocurable liner that is reversely inserted into the pipe to be repaired, and UV A device for photocuring the photocurable liner by irradiating light, comprising: an apparatus main body; A UV lamp installed in the main body of the device; A plurality of variable length support legs supporting the device body, supporting the device body against an inner surface of the photocurable liner that is inverted and expanded into the pipe, and adjustable in length; And a wheel installed at an end of the support leg, wherein the support leg includes: a fixed leg portion fixedly installed on the device body; A variable leg portion that is slid in and out of the fixed leg portion to be connected so as to be adjustable in length, wherein the variable leg portion rotates in a locking direction with respect to the fixed leg portion to maintain a fixed state with respect to the fixed leg portion, It is an inverted TV light generating device for repairing a UV hardening pipe that is connected to the fixed leg so that the state can be changed by rotating it in the opposite direction of the unlocking direction to unlock it.

Conventionally, the construction technology of tube liners by light curing has various causes of fire, but there is no countermeasure against this, resulting in a fire, which incurs economic loss from this fire, as well as harms the working environment due to fire, and prevents workers' respiratory-related diseases. There are problems such as causing

Specifically, when the light-irradiation curing device is applied with power and moves the tube liner while irradiating light, sparks may occur at the electrical connection of the light-irradiation curing device, and this spark acts as a cause of ignition, resulting in a fire. Or, due to the characteristics of the light irradiation curing device, high temperature heat is generated, and the inside of the tube liner is in a high temperature atmosphere. At this time, the inner film of the tube liner comes into contact with the light irradiation curing device, causing a fire.

Registered Patent No. 10-1383855

The present invention is to solve the above-described problems, the underground pipeline is covered with a tube liner impregnated with a photocurable resin and hardened by irradiation of light to repair and reinforce, and even if a cause of ignition occurs in this process, it does not lead to fire. It is an object of the present invention to provide a fire protection type non-excavation total repair photo-curing method and a non-combustible gas conversion and supply device using non-combustible gas.

The fire prevention type non-excavation total repair photocuring method using a non-combustible gas according to the present invention comprises: a first step of installing a tube liner in an underground pipeline; A second step of converting air to prepare a non-flammable fire prevention gas; A third step of expanding the tube liner and lining it on the inner wall of the pipe; A fourth step of injecting the fire prevention gas prepared in the second step; A fifth step of curing the tube liner by moving the light irradiation curing device along the inside of the tube liner while the inside of the tube liner is filled with fire prevention gas through the fourth step; After completing the curing of the tube liner, a sixth step of drawing the light irradiation curing device to the outside of the tube liner is included, and the second step is to convert air to an oxygen concentration that prevents ignition and convert the fourth step. The step is characterized in that fire is prevented by injecting the fire prevention gas converted through the second step into the inside of the tube liner to block ignition during curing of the light irradiation curing device.

According to the fire prevention type non-excavation total repair photocuring method and the non-combustible gas conversion supply device using a non-combustible gas according to the present invention, the inside of the tube liner is created in a non-combustible atmosphere, so that the light irradiation curing device is applied with power and irradiated with light. When using a tube liner, even if a cause of ignition such as sparks occurs, the fire is fundamentally blocked, so the loss of the tube liner due to the fire and the cost for restoration of the equipment are reduced. Also, it prevents the discharge of fire smoke to the ground. It has the effect of preventing air pollution and protecting workers from fire.

1 is a block diagram of a non-combustible gas conversion supply device according to the present invention.
Figure 2 is a block diagram of a mixed cooler applied to the non-combustible gas conversion supply device according to the present invention.
3 is another exemplary view of a non-combustible gas conversion supply device according to the present invention.
4 to 6 are process diagrams of a fire prevention type non-excavation total repair photocuring method using a non-combustible gas according to the present invention,
4 is a diagram showing the installation process of the tube liner,
5 is a process chart using the non-combustible gas conversion and supply device according to the present invention,
6 is a process chart showing the completion of installation of the tube liner.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout the present specification.

The present invention is a technology for repairing and reinforcing non-drilling pipes, and the solution principle is to prevent ignition during photocuring by a light irradiation curing device by injecting a non-combustible gas into the inside of a tube liner, and other configurations are not limited to those described below. Does not.

The non-combustible gas conversion supply device 100 for photo-curing non-excavation total repair according to the present invention converts air as a starting material into non-combustible gas and supplies it to the inside of a tube liner, and removes foreign matter according to the characteristics of the air. And oxygen removal (low concentration), and includes a mixture of extinguishing gas to improve non-flammable properties, and as shown in FIG. 1, an air compressor 10, an air dryer for removing foreign substances (impurities) (air dryer) (20), a membrane filter (30) for controlling oxygen concentration, a digestive gas supply device (40) for supplying a gas (for example, carbon dioxide) that is digestible or non-flammable, a membrane filter (30) The mixture cooler 50 is configured to mix the gas passing through and the extinguishing gas and lower the temperature. The above configurations are merely examples of configurations that perform each function, and are not limited by the present invention.

In the terms of the present invention, extinguishing gas refers to a group including a gas (fire extinguishing liquid) that extinguishes a fire, and is intended to enhance non-combustible characteristics, and the fire prevention gas refers to a gas that has been converted into extinguishability and non-combustibility.

The air compressor 10 compresses air (air in the atmosphere), and the compressed air is used for inflating the tube liner before curing, and is also used for the purpose of smooth supply.

The air dryer 20 removes foreign substances (moisture, oil, etc.) contained in the compressed air.

The membrane filter 30 separates and removes oxygen from the compressed air that has passed through the air dryer 20 to discharge low concentration (0-15% concentration that does not cause fire ignition) oxygen gas (low oxygen high nitrogen gas). .

Membrane filter 30 having such a function is a ready-made product and uses a hollow fiber membrane having a property of permeating oxygen more easily than nitrogen. While compressed air flows inside the membrane, oxygen selectively permeates the membrane, and as a result, the outlet of the membrane. Is to obtain a nitrogen-enriched gas from.

The amount of oxygen in the compressed air inside the tube liner accounts for about 21% as in the general atmosphere, and when oxygen is separated and discharged using the membrane filter 30, a gas separate purification technology, low oxygen and high nitrogen compression with an oxygen concentration of less than 15% Since it can supply air, it is difficult to ignite materials, and even after a fire occurs, the spread of fire to a low-oxygen environment is blocked, so fire prevention becomes possible.

The extinguishing gas supply unit 40 supplies a gas-based extinguishing agent to impart the extinguishing characteristics of the gas passing through the membrane filter 30, and a extinguishing gas tank, a extinguishing agent connecting the extinguishing gas tank and the mixed cooler 50 The configuration includes a gas supply pipe, and a valve for adjusting an opening degree of the extinguishing gas supply pipe.

In the present invention, it is possible to reduce the oxygen concentration through mixing of the digestive gas without lowering the oxygen concentration through the membrane filter 30.

The mixed cooler 50 also prevents the occurrence of fire (including ignition and diffusion) due to heat generation of the gas passing through the membrane filter 30, and the internal temperature of the tube liner rises rapidly due to high temperature heat generation due to the lighting of the light irradiation device. The temperature of the gas is lowered so that a fire does not occur due to the electric spark of the light irradiation device, and the temperature is in the range of -10 to 40℃.

The refrigerant is, for example, dry ice. Dry ice is known to be -78.5°C, and even if the temperature of the gas supplied to the mixing cooler 50 rises to 50°C in summer, the temperature of the gas can be lowered. The refrigerant is not limited to dry ice.

The mixing cooler 50 is connected to the supply pipe of the extinguishing gas supply unit 40 to receive a clean gas-based extinguishing agent and mixes it with the gas supplied from the membrane filter 30, and the extinguishing performance is enhanced and non-flammable through this mixing. Becomes higher.

The structure of the mixing cooler 50 is, as shown in FIGS. 1 and 2, a tank 51 having an inlet 52 and an outlet 53 and having a space therein, and the space of the tank 51 is input chamber from the top. (51-1)-Cooling chamber (51-2)-Consists of primary and secondary separation membranes (54, 55) partitioned into the space of the discharge chamber (51-3).

The tank 51 is formed such that the inlet 52 is close to the ceiling while the outlet 53 is close to the bottom, so that the gas supplied from the membrane filter 30 is supplied into the input chamber 51-1-the cooling chamber 51- 2)-It is discharged after flowing through the discharge chamber 51-3.

The tank 51 may include a discharge port 53 and a separate drain port, and an integral type of the input chamber 51-1-the cooling chamber 51-2-the discharge chamber 51-3 as well as an assembly type is also possible. .

The primary and secondary separators 54 and 55 are composed of primary and secondary porous plates 54-1 and 55-1 and primary and secondary filters (nonwoven fabrics) 54-2 and 55-2, respectively. do.

The primary/secondary perforated plates 54-1 and 55-1 serve as, for example, a perforated plate, which serves to divide and mix the supply gas, and the primary/secondary filters 54-2 and 55-2 It acts as a filtering.

Accordingly, the primary/secondary porous plates 54-1 and 55-1 are disposed closer to the inlet 52 and the outlet 53 than the primary/secondary filters 54-2 and 55-2.

The cooling chamber 51-2 includes a door for introducing a refrigerant (dry ice), and also includes a viewing window for confirming the inside. The viewing window may be formed on the door.

In the present invention, the composition of the gas discharged from the mixing cooler 50 is 14% oxygen, 82% nitrogen, 3% carbon dioxide, and 1% others. The composition ratio depends on the change in the composition of oxygen and is not limited by the present invention.

In the present invention, a gas for achieving a solution must be injected into a tube liner, and an oxygen concentration meter 31, a carbon dioxide concentration meter 54, and a thermometer 55 are included so that the non-combustible gas converted by the above-described configuration can be identified. It is desirable to do it.

The oxygen concentration meter 31 detects and displays the oxygen concentration of the gas that has passed through the membrane filter 30, and the display method can be variously implemented.

Further, not only showing the oxygen concentration value, but when the oxygen concentration is higher than the reference concentration, the gas that has passed through the membrane filter 30 is passed through the membrane filter 30 again or another oxygen concentration regulator is passed to match the reference concentration. 3 shows an oxygen concentration control flow path 32 for passing the gas that has passed through the membrane filter 30 through the membrane filter 30 again, and the oxygen concentration control flow path 32 is opened and closed by a valve. Opens and closes through the control of the program or is operated by the administrator's manual operation.

The carbon dioxide concentration meter 54 detects the carbon dioxide concentration and temperature of the gas that has passed through the mixing cooler 50, respectively.

Based on the detection values of these (54,55), dry ice, which is a gaseous refrigerant, is a raw material from carbon dioxide that regulates emission worldwide. By adjusting the number of dry ice, the concentration and temperature of carbon dioxide can be adjusted. For example, as shown in FIG. 3, carbon dioxide and a temperature control flow path 56 may be included.

The carbon dioxide and temperature control flow path 56 is configured with a valve (manual control type or automatic control type) for the same purpose as the oxygen concentration control flow channel 32.

The non-combustible gas conversion supply device 100 for photocuring non-drilling overall repair according to the present invention may be configured to achieve a problem of expansion of the tube liner, and the configuration includes a bypass flow path 60 and a valve It includes (61).

The bypass flow path 60 is piped to supply the gas passing through the membrane filter 30 to the tube liner avoiding the mixing cooler 50, and the valve 61 is a mixture cooler for the gas passing through the membrane filter 30. Opening and closing operation is performed so as to be supplied to 50 or supplied to the bypass flow path 60. In this case, since the gas whose oxygen concentration is adjusted is supplied to the tube liner, it helps to create an atmosphere for preventing fire inside the tube liner.

Alternatively, although not shown in the drawing, the bypass flow path 60 is piped to supply the gas passing through the air dryer 20 to the tube liner avoiding the membrane filter 30, and a valve capable of the same operation as the valve 61 Is composed.

The present invention is equipped with a monitor showing information such as oxygen concentration, carbon dioxide concentration, temperature, and a keypad for inputting concentration and temperature.

The non-excavation total repair and reinforcement method using the fire extinguishing light irradiation curing apparatus according to the present invention is as follows, and a novel method according to the present invention will be described in detail, and only the same parts as in the prior art will be schematically described.

First, as a novel method according to the present invention, the pre-inspection of the non-combustible gas conversion supply device 100 for photo-curing non-excavation total repair, the non-combustible gas conversion supply device 100 and tube liner for the non-excavation total repair photo-curing Incombustible gas of the tube liner by the expansion of the tube liner by the internal connection, non-excavation total repair and non-combustible gas conversion supply device 100 for photo-curing, the non-excavation total repair and non-combustible gas by the non-combustible gas conversion supply device 100 for photo-curing There is an atmosphere created.

1. Pre-check.

The non-excavation total repair and non-combustible gas conversion supply device 100 for photo-curing is inspected on the ground. The inspection is such as on/off of the applied lamp in the light irradiation curing apparatus, and the on/off of the air compressor 10 in the non-excavated gas conversion supply apparatus 100 for full repair light curing.

At this time, the light irradiation curing device also checks the on/off of the lamp.

2. Install tube liner.

4 is an exemplary view showing the process of installing the tube liner 2 inside the underground pipeline 1, traction installation-cutting-assembly of the packer and connecting the rope for movement of the light irradiation curing device-temporary expansion as a process .

2-1. Tubeliner traction installation (A).

There are manholes (3,4) on both sides of the longitudinal direction of the pipe (1), and the tube liner (2) is pulled to the opposite side through the manhole (4) on the left as shown in the drawing and installed.

The tube liner 2 is loaded in a loading box on the ground.

2-2. Tube liner cutting (B).

The start of the tube liner (2) is arranged on the inlet side of the manhole (3) (chogu) on the right side of the drawing, and after the towing work is completed, align the opposite side of the tube liner (2) with the manhole (4) (malgu) according to the construction length. Cut. Reload the remaining tube liner in the storage box and store it.

2-3. Tube liner packer installation (C).

The packers 5 and 6 are fastened to both ends of the tube liner 4 on which the traction is completed, and the inside of the tube liner 2 is blocked from the outside, that is, sealed. Here, the sealing includes sealing in which the expansion fluid for expansion of the tube liner 2 is introduced from one side and discharged to the other side.

In addition, the light irradiation device traction rope 7 is tied to the traction line previously inserted into the tube liner 2 and pulled to the opposite side.

2-4. Temporary expansion.

The tube liner 2 is inflated, and although not shown in the drawing, the leading end of the light irradiation curing device is tied to a traction rope and pulled up to the opposite side of the packer 5. At this time, when towing, the tube liner (2) folded in three should be unfolded to facilitate rope traction. However, it is not necessary to maintain the pressure by blowing compressed air into the pipe at a level that extends the entire tube liner (2).

3. Insertion of light irradiation curing device and connection of non-combustible gas conversion supply device for light curing of non-drilling overall repair (see Fig. 5).

The light irradiation curing device 300 is inserted and installed in the tube liner 2 through the packer 5 on one side.

In addition, by connecting the non-combustible gas conversion supply device 100 for photocuring non-drilling overall repair to the packer 5 to prepare the injection of compressed air or fire prevention gas, the connection is made at the discharge part of the mixed cooler 50 ( 53) and the packer (5) can be connected with a hose.

In addition, the method of the present invention may include checking the components of the gas discharged from the end of the tube liner using a measuring device (portable or fixed type), for example, a portable measuring device 200 on the packer 6 at the end. Connect.

4. Inflate the tube liner.

Compressed air is opened when the bypass flow path 60 of the non-excavated total repair and light curing device 100 is opened, the inflow side of the mixing cooler 50 is blocked, and the air compressor 10 is turned on and operated. After passing through the bypass flow path 60, the tube liner 2 is injected into the tube liner 2 to expand the tube liner 2, and eventually the tube liner 2 is lined in a taut state on the inner wall of the tube line 1.

5. Creating a non-flammable atmosphere in the tube liner.

The bypass flow path 60 of the non-combustible gas conversion supply device 100 for non-drilling total repair photocuring is blocked, while the mixing cooler 50 and the membrane filter 30 are connected.

Compressed air is converted into a fire prevention gas (cooling gas) through an air dryer 20-membrane filter 30-mixed cooler 50 and then injected into the tube liner 2.

Therefore, the inside of the tube liner 2 is created in an atmosphere that does not cause ignition.

The gas for fire prevention is a circulation type that is introduced through the packer (5) on one side, passes through the tube liner (2), and is exhausted to the outside through the packer (6) at the end, or a packer after a certain amount is filled in the tube liner (2). A filling type that is sealed through (5,6) is possible.

6. Tube liner hardening.

After applying power to the lamp of the light-irradiation curing device 300, the light-irradiation curing device 300 is moved in the tube liner 2 along the longitudinal direction of the tube liner 2 so that the impregnated resin of the tube liner 2 is Cure.

Since the present invention can also be cooled through a fire prevention gas, construction can be performed without a separate cooling process.

7. Closing (see Figure 6).

When curing and cooling are completed, both ends of the tube liner 2 are cut to remove the packers 5 and 6, and the light irradiation curing device 300 is taken out to the ground. In addition, the non-combustible gas conversion supply device 100 for photocuring the entire non-drilling repair is separated from the packer 5.

And, when the protective film is applied to the inner circumferential surface of the tube liner 2, the protective film is removed.

10: air compressor, 20: air dryer
30: membrane filter, 31: oxygen concentration meter
32: oxygen concentration control flow,
40: extinguishing gas supply,
50: mixing cooler, 51: tank
51-1: input chamber, 51-2: cooling chamber
51-3: discharge chamber, 52: injection part
53: discharge unit, 54: carbon dioxide concentration meter
55: thermometer, 56: carbon dioxide and temperature control flow
60: bypass euro,

Claims (11)

A first step of installing a tube liner in an underground pipeline;
A second step of preparing a non-combustible fire prevention gas by converting air through a non-combustible gas conversion supply device;
A third step of expanding the tube liner and lining it on the inner wall of the pipe;
A fourth step of injecting a fire prevention gas prepared through the non-combustible gas conversion supply device;
A fifth step of curing the tube liner by moving the light irradiation curing device along the inside of the tube liner while the inside of the tube liner is filled with fire prevention gas through the fourth step;
After completing the curing of the tube liner, including a sixth step of drawing the light irradiation curing device to the outside of the tube liner,
In the second step, the air is converted by adjusting the oxygen concentration to prevent ignition, and in the fourth step, the fire prevention gas converted through the second step is injected into the inside of the tube liner to be cured during the curing of the light irradiation curing device. Blocks ignition,
The non-combustible gas conversion and supply device includes: an air dryer for removing foreign substances contained in air; A membrane filter for separating and removing oxygen from the air from which foreign substances have been removed by the air dryer; A fire prevention type non-excavation total repair photocuring method using a non-combustible gas, characterized in that it comprises a mixing cooler for lowering the temperature of the gas passing through the membrane filter and injecting it into the inside of the tube liner lined in the underground pipeline. The method of claim 1, wherein the second step is to separate and remove oxygen contained in the air, convert it into a non-flammable fire prevention gas having a low oxygen concentration, and supply it. Chemical method. The method of claim 1, wherein the second step is to produce a fire prevention gas by mixing at least one of the group of extinguishing gases including gaseous extinguishing agents without removing oxygen. Repair photo-curing method. The method of claim 1, wherein in the second step, the oxygen concentration is lowered through separation of oxygen contained in the air, and then the fire prevention gas is produced by mixing the extinguishing gas. Photo-curing method. The method of any one of claims 1 to 4, wherein in the second step, the temperature of the fire prevention gas is controlled through a refrigerant. The method of any one of claims 1 to 4, wherein the second step starts with compressing air and prepares a compressed fire prevention gas. Method. The fire prevention type non-excavation overall repair sight using non-combustible gas according to claim 6, wherein the third step expands the tube liner by injecting the compressed fire prevention gas prepared in the second step into the tube liner. Chemical method. An air dryer for removing foreign substances contained in the air;
A membrane filter for separating and removing oxygen from the air from which foreign substances have been removed by the air dryer;
And a mixing cooler for lowering the temperature of the gas passing through the membrane filter and injecting it into the inside of the tube liner lined in the underground pipeline. The apparatus for converting and supplying non-combustible gas according to claim 8, comprising a non-combustible gas supply unit for injecting a non-combustible gas into the mixing cooler. The apparatus for converting and supplying non-flammable gas according to claim 8 or 9, comprising an air compressor for supplying compressed air to the air dryer.
The apparatus of claim 10, further comprising a bypass means for supplying the gas that has passed through the membrane filter or the gas that has passed through the air dryer to the tube liner while avoiding the mixing cooler.

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