JP2000343609A - Technique for lining pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for lining a pipe in which heat energy is effectively utilized irrespective of the shape of a pipeline and the lining material for the pipe is effectively heated at the temperature not higher than the prescribed temperature for a short time and cured and heat shrinkage and residual stress generated in the lining material of the pipe after curing are suppressed at a low level. SOLUTION: In the technique for lining a pipe, lining material for the pipe is inserted into a pipeline 1 and thereafter is expanded by pressure of a fluid supplied into a closed space S' including the inside of the lining material for the pipe and pressed on the inner wall of the pipeline 1. In this state, the lining material for the pipe is heated by a heating medium and thermosetting resin impregnated thereinto is cured. A circulation route incorporating the closed space S', a heating part (a hot water tank 32, a hot water pump 34 and a boiler 35) and an air blasting part (a blast fan 39) is formed. Heated air and steam are used as the heating medium and these are circulated in the inside of the circulation route. The circulating flow of heated air and steam is formed in the inside of the lining material for the pipe and the same is heated by the circulated heated air and steam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe lining method for lining and repairing an aged pipe using a pipe lining material impregnated with an uncured thermosetting resin.

[0002]

2. Description of the Related Art When a pipeline such as a sewer pipe is deteriorated, a pipe lining method for repairing the pipeline by lining the inner peripheral wall of the pipeline without bending the pipeline from the ground has been proposed. It is already in practical use.

[0003] As one of such pipe lining methods, a pipe lining material obtained by impregnating a tubular resin adsorbent with an uncured thermosetting resin is inserted into a pipe line.
The pipe lining material is expanded by the fluid pressure supplied into the closed space including the inside of the pipe lining material and pressed against the inner wall of the pipe, and the pipe lining material is heated by a heating medium to thereby reduce the pressure. There is known a method of curing the impregnated thermosetting resin.

[0004] In such a pipe lining method, as a heat medium for curing the thermosetting resin impregnated in the pipe lining material, hot water, hot water shower, steam, hot air or the like has been used.

[0005] When hot water is used as a heat medium, a heating device such as a boiler is installed outside the pressurized space of the pipe lining material to circulate the hot water through a circulation path including the pressurized space, and the hot water flows inside the pipe lining material. To heat the pipe lining material by satisfying the above condition, there is a problem that a large amount of heat energy is required.

Therefore, a method has been proposed in which hot water is showered inside the pipe lining material to reduce heat energy. In this method, while the pipe lining material is expanded by air pressure and pressed against the inner wall of the pipe, hot water is showered from a hot water hose provided inside the pipe lining material to be used for heating the pipe lining material. The operation of flowing the hot water supplied to the heating through the bottom of the pipe lining material and discharging it out of the pipe lining material, and re-heating the discharged hot water with a boiler and again supplying the heated pipe lining material, is continuously performed. Done.

However, in the above-mentioned construction method using hot water showering, a large amount of hot water is accumulated at the bottom of the pipe lining material in a pipe having an inverse slope or a pipe that is loosened gently, thereby reducing thermal energy. It was impossible.

In the method using steam or hot air as a heat medium, the steam or hot air used for heating the pipe lining material is discharged out of the pipe lining material as it is without circulating the steam or hot air in a closed loop. Therefore, there is a problem that heat energy is wasteful and a large amount of heat energy is required.

In particular, in the method using steam, there is a problem that the steam is cooled in the pipe lining material to form water droplets, and water accumulates at the bottom of the pipe lining material to prevent the hardening of the pipe lining material.

In the method using hot air, the hot air does not form a circulating flow inside the pipe lining material, so that it mainly flows in the upper portion of the pipe lining material, and the bottom of the pipe lining material is not sufficiently heated. There was a problem that poor curing easily occurred.

Therefore, the present inventor has previously proposed a pipe lining method in which heated air is used as a heat medium for heating the pipe lining material, and the heated air is circulated in a closed loop circulation path (Japanese Patent Application No. 2002-214,197). No. 11-15924). According to this method, a required lining can be surely applied to a pipe having a reverse slope or a pipe that is gently loosened, and a circulating flow of heated air is formed inside the pipe lining material. Thus, the pipe lining material can be uniformly heated and uniformly cured.

[0012]

However, in the above-mentioned pipe lining method, since only low-humidity heated air is used as a heat medium for heating the pipe lining material, the heating efficiency is poor and a long time is required for heating. There was a problem that it was necessary.

Therefore, when the temperature of the heated air is increased in order to increase the heating efficiency and shorten the heating time, the heat generated by the curing of the thermosetting resin is added, so that the pipe lining material is heated to a temperature higher than the temperature of the heated air. Then, the cured pipe lining material is cooled to room temperature. However, as described above, when the pipe lining material is heated to a temperature equal to or higher than the temperature of the heated air, heat shrinkage or residual stress is applied to the cooled pipe lining material. There was a problem that occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to efficiently utilize heat energy to reduce the temperature of a pipe lining material to a predetermined temperature or less, in a short time, regardless of the shape of a pipe. It is an object of the present invention to provide a pipe lining method capable of heating and curing the same to suppress the heat shrinkage and residual stress generated in the cured pipe lining material.

[0015]

In order to achieve the above object, according to the first aspect of the present invention, a tube lining material obtained by impregnating a tubular resin adsorbent with an uncured thermosetting resin is inserted into a pipeline. After that, the pipe lining material is expanded by the fluid pressure supplied into the closed space including the inside of the pipe lining material, and the pipe lining material is heated by a heat medium while being pressed against the inner wall of the pipe line. In a pipe lining method in which the thermosetting resin impregnated therein is cured, a circulation path is formed including the closed space, a heating section and a blowing section, and heated air and steam are used as the heating medium. Then, these are circulated in the circulation path to form a circulating flow of heated air and steam inside the pipe lining material, and the circulating heated air and steam apply the pipe lining material. Characterized by being adapted to.

According to a second aspect of the present invention, in the first aspect of the present invention, a discharge hose is provided at a bottom portion of the pipe lining material, and heated air and steam are pipe-lined from a discharge port formed in the discharge hose. It is characterized in that the material is discharged into the material.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a hot fluid circulation hose is provided at a bottom portion of the pipe lining material, and the hot fluid is circulated through the hot fluid circulation hose to form a pipe. The bottom of the lining material is heated.

According to a fourth aspect of the present invention, in the third aspect, the heated air circulating in the circulation path and the steam are heated by heat exchange with the hot fluid circulating in the hot fluid circulation hose. It is characterized by the following.

According to a fifth aspect of the present invention, in the first to third or fourth aspects of the present invention, the supply of the fluid pressure to the closed space is performed from outside the pipe lining material of the circulation path.

According to a sixth aspect of the present invention, in the third or fourth aspect of the present invention, the heat fluid circulation hose is formed of a hose having a circular cross section having a resistance to an external force.

According to a seventh aspect of the present invention, in the sixth aspect, the heat fluid circulation hose is formed of a rubber hose.

According to the present invention, since the heating air and the steam are used as the heating medium for heating the pipe lining material, the specific heat of the heating medium is increased and the pipe lining material is efficiently heated in a short time. At the same time, the heat generated by curing the thermosetting resin is suppressed, and the temperature rise of the pipe lining material is prevented,
The heat shrinkage and residual stress generated in the hardened pipe lining material are suppressed to a small level, and the required lining can be reliably applied to a pipe having an inverse slope or a pipe that is loosened gently.

Further, according to the present invention, since the method of circulating the heating air and the steam as the heat medium in the closed loop circulation path is adopted, efficient heating can be realized without wasting heat energy. At the same time, a circulating flow of heated air and steam is formed inside the pipe lining material, so that the pipe lining material can be uniformly heated and hardened uniformly.

Further, according to the present invention, the heat fluid is circulated through the heat fluid circulation hose provided at the bottom of the pipe lining material to heat the bottom of the pipe lining material. Even if hot water accumulates at the bottom of the pipe lining material because the steam circulating through the pipe is cooled below the saturation temperature and liquefied, this hot water is heated by the hot fluid flowing through the hot fluid circulation hose. No hardening failure is caused. Even if the steam is liquefied, a large amount of hot water does not accumulate in the bottom of the pipe lining material because the steam occupies a small amount in the heat medium.

[0025]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a pipe lining material reversing operation in the pipe lining method according to the present invention, FIG. 2 is a cross-sectional view of a pipe lining material reversing device, and FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3, FIG. 5 is a cross-sectional view of the inverted end portion of the pipe lining material, FIG. 6 is a cross-sectional view showing the operation of inserting the pipe lining material into the pipe, and FIG. FIG. 8 is a cross-sectional view taken along the line CC of FIG. 7 showing the work of hardening the lining material.

In FIG. 1, reference numeral 1 denotes a pipeline such as a sewer pipe buried in the ground, and 2 denotes a manhole which is open to the ground.
A 90 ° elbow-shaped pipe lining material mounting nozzle 3 is installed at the bottom of the inside. A lower end of a flexible guide tube 4 is attached to an outer periphery of an upper end opening of the pipe lining material attaching nozzle 3, and an upper end of the guide tube 4 is attached to an outer periphery of a top nozzle 5 installed on the ground. still,
A sealing lid 7 is hermetically attached to the upper surface of the top nozzle 5 by a plurality of G clamps 8 with a packing 6 interposed therebetween.

Further, the pipe line 1 of the pipe lining material mounting nozzle 3
One end of a pipe lining material 9 is attached to the outer periphery of the end opening horizontally toward the outside by being folded outward.
The tube lining material 9 is configured by impregnating a thermosetting resin into a tubular resin adsorbing material 9b whose outer surface is covered with a highly airtight plastic film 9a (see FIGS. 3 and 4). The tube lining material mounting nozzle 3 and the guide tube 4 may be omitted, and one end of the tube lining material 9 may be directly mounted on the top nozzle 5.

Here, as the tubular resin adsorbing material 9b constituting the pipe lining material 9, a non-woven fabric made of a plastic fiber such as polyester, vinylon or acrylic is used, and as the plastic film 9a coated on the outer surface thereof, A composite film containing polyurethane, polyethylene, vinylon, EVA or EVOH is used.

As the thermosetting resin impregnated in the tubular resin adsorbing material 9b, unsaturated polyester resin, vinyl ester resin, epoxy resin or the like is used. When an unsaturated polyester resin or vinyl ester resin is used as the thermosetting resin, an organic peroxide is used as a curing agent (catalyst), and a metal powder such as cobalt or manganese is used as a curing accelerator. In this case, a coated metal powder whose surface is coated with a coating material that melts at a certain temperature may be used. As the organic peroxide, it is desirable to use cumene hydroperoxide alone or a mixture with another kind of organic peroxide. Further, silica, magnesium oxide, talc, aluminum hydroxide, alumina, glass beads, or the like may be mixed as a filler with the thermosetting resin.

On the other hand, as shown in FIG. 1, a pipe lining material reversing device 10 is installed on the ground, and as shown in detail in FIG.
1, a pipe lining material take-up reel 12 and a sheet take-up reel 13 are rotatably accommodated, and a refrigerator 14 is installed on the cool container 11, and a compressor 15 is connected to the cool container 11 via an air hose 16. Connected and configured.

The cooling container 11 is made of a heat insulating material, and has cooling pipes 17 and 1 extending from the refrigerator 14.
The pipes 8 and 19 are connected to the inside and the wall of the cool container 11 and to the center of the rotating shaft 12a of the tube lining material take-up reel 12. Therefore, the cooling pipes 17 to 19 are supplied from the refrigerator 14.
The inside of the cold storage container 11 and the wall and the rotating shaft 12a of the tube lining material take-up reel 12 are cooled by the refrigerant flowing through the inside, respectively. The temperature is kept low enough not to cure.

By the way, the pipe lining material 9 before inversion is wound on a pipe lining material take-up reel 12 in the cool container 11, and at this time, the pipe lining material 9 is wrapped as shown in FIGS. The inner and outer peripheral surfaces are sandwiched between cold insulating sheets (or heat insulating sheets) 20 and are kept cold (or insulated).

Further, a tapered tubular pipe lining material removal guide 21 is attached to an opening formed at one end of the cold storage container 11, and as shown in FIG. The hermetic lid 7 is connected to a reverse guide hose (or pipe) 22. Accordingly, a closed space S is formed in the cold storage container 11 in which the reversing guide hose (or pipe) 22, the guide tube 4, the pipe lining material mounting nozzle 3 and the pipe lining material 9 are hermetically sealed.

The tube lining material 9 pulled out of the tube lining material take-up reel 12 in the cold storage container 11 of the tube lining material reversing device 10 is guided by the guide roller 23, and the tube lining material take-out guide 21 is inverted. One end of each of the guide hose (or pipe) 22, the guide tube 4, and the pipe lining material attaching nozzle 3 is folded outward as described above, and attached to the outer periphery of one end opening of the tube lining material attaching nozzle 3. Have been.

Then, from the state shown in FIG. 1, the compressor 15 installed on the ground is driven to supply compressed air through the air hose 16 to the pipe lining material reversing device 10.
Is supplied into the closed space S formed in the cold storage container 11 of FIG.
As shown by the broken line in FIG. By the reversal insertion of the pipe lining material 9 into the pipe line 1, the pipe lining material 9 wound around the pipe lining material take-up reel 12 provided in the cold storage container 11 of the pipe lining material reversing device 10 is sequentially sent out. At the same time, the cold insulation sheet (or heat insulating sheet) 20 covering the inner and outer peripheral surfaces of the tube lining material 9 is separated from the tube lining material 9 and wound around the sheet take-up reel 13. It should be noted that another pressure fluid such as water pressure may be used for the reverse insertion of the pipe lining material 9 into the pipe 1, or the pipe lining material 9 may be pulled into the pipe 1 by pulling with a belt or a rope. You may do it.

As described above, when the pipe lining material 9 is sequentially inserted in the pipe 1 in an inverted manner, as shown in FIG.
Hot water circulation hose 2 bent in a U-shape as shown in
4 and a discharge hose 25 having one end opened are attached by a rope 26, respectively. Here, the hot water circulation hose 24 and the discharge hose 25 air-tightly penetrate the upper sealing lid 28 via the sealing member 27, and the upper sealing lid 28 through which the hot water circulation hose 24 and the discharge hose 25 penetrate is shown in FIG.
As shown in the figure, the plurality of G clamps 8 air-tightly attach to the upper surface of the top nozzle 5. As a result, a closed space S 'is formed inside the upper closed lid 28, the top nozzle 5, the guide tube 4, and the pipe lining material 9.
As the hot water circulation hose 24, a rubber hose having a circular cross section and an inner diameter of 8 m / m to 60 m / m having a resistance to an external force is used.

As shown in FIG. 6, a compressor 30 installed on the ground is connected to a fluid discharge hose (air hose) 29 connected to the pipe lining material mounting nozzle 3. Note that a pressure gauge 31 for measuring the internal pressure of the closed space S ′ is attached to the upper closed lid 28.

When the compressor 30 is driven from the state shown in FIG. 6 to supply compressed air into the closed space S ′ via the fluid discharge hose (air hose) 29, the pressure of the compressed air is reduced by the pipe lining material 9. The hot water circulation hose 24 and the discharge hose 25 attached to the inversion end of the pipe lining material 9 are further inserted into the pipe line 1 while receiving and reversing, as shown in FIG. It is sequentially drawn in.

When the pipe lining material 9 is inserted over the entire length of the pipe 1 as shown in FIG. 7, the hot water circulation hose 2 attached to the inverted end of the pipe lining material 9 is inserted.
4 and the discharge hose 25 are drawn into the pipe lining material, and the warm water circulation hose 24 and the discharge hose 25 are arranged at the bottom of the pipe lining material 9 as shown in FIG. Here, the discharge hose 25 has an inner diameter of 8 m / m to 80 m / m.
A rubber hose having a circular section of m is used, and a plurality of discharge ports (not shown) are formed at appropriate intervals over the entire length.

As shown in FIG. 7, one end of the discharge hose 25 drawn into the pipe lining material 9 is open in a closed space S 'as shown in FIG. An end extending outside the space S ′ is connected to a heat exchanger 33 provided in a hot water tank 32 installed on the ground.
Is connected to one end.

Hot water is stored in the hot water tank 32. One end of the hot water circulation hose 24 is drawn out from a lower side wall of the hot water tank 32, and a hot water pump 34, a boiler 35 and a valve 36 Is provided.
The other end of the hot water circulation hose 24 is opened above the hot water tank 32 as shown in FIG.
4. The hot water tank 32, the hot water pump 34, the boiler 35 and the like constitute a heating unit. In addition, a thermometer 37 for detecting the temperature of the hot water is attached to a side wall of the hot water tank 32.

A fluid discharge hose 29 extending from the pipe lining material mounting nozzle 3 extends to the ground through the manhole 2, and has an end connected to the other end of the heat exchanger 33 provided in the hot water tank 32. It is connected to the. A valve 38 and a blower fan 39 are provided in the middle of the fluid discharge hose 29, and an air hose 40 branching from the middle of the fluid discharge hose 29 is connected to a compressor 41, and an air hose 4 derived from the compressor 41.
2 is connected to a fluid discharge hose 29. Incidentally, valves 43 and 44 are attached to the middle of the air hoses 40 and 42, respectively. The blower fan 39 is driven to rotate by an electric motor 45.

On the other hand, a steam generator 46 is installed on the ground, and hot water is introduced into a container 47 of the steam generator 46 via a hot water pipe 48 branched from the hot water circulation hose 24. The steam generated in the container 47 by the heating of the hot water by the electric heater 49 is a predetermined amount (a necessary and sufficient amount for increasing the humidity of the heated air) from the steam hose 50 to the middle of the discharge hose.
Only supplied. Here, the steam hose 50 is wound around a part of the discharge hose 25 as shown in the figure, and the part is covered with a tubular heat insulating material 51. The hot water pipe 48 and the steam hose 50 have valves 52, 5
3 are provided, and a thermometer 54 for measuring the temperature of the hot water in the container 47 is attached to the side of the container 47.

In the state shown in FIG. 7, compressed air is introduced from the compressor 41 into the fluid discharge hose 29 via the air hose 42, and this compressed air is supplied into the closed space S 'and The lining material 9 is expanded and pressed against the inner wall of the pipeline 1. At this time, a closed loop is formed by the closed space S ′ and the discharge hose 25, the fluid discharge hose 29, and the heat exchanger 33 connected thereto,
These constitute a circulation path of the heated air and the steam, and the circulation path includes a blower configured by the blower fan 39. Incidentally, the internal pressure of the closed space S 'is set to ^{0.3kg / cm 2 ~1.2kg / cm 2} .

Then, the pipe lining material 9 pressed against the inner wall of the pipe line 1 is heated by the heated air and steam circulating in the above-mentioned circulation path, and the thermosetting resin impregnated therein is cured. The flow rate of heated air and steam was 1
00 liter / min-3000 liter / min, pressure 50m
It is preferable to circulate at a mAq to 3000 mmAq.

When the pipe lining material is cured, the hot water pump 34, the boiler 35, the steam generator 36, and the blower fan 39 are driven, and the heated air is supplied to the heat exchanger 33 in the hot water tank 32 at a temperature of 60.degree. ° C
Is heated to a predetermined temperature by heat exchange with hot water, steam supplied from a steam hose 50 is added to the heated air while flowing through the discharge hose 25, and a mixture of heated air and steam is formed in the discharge hose 25. The plurality of discharge ports (not shown) are uniformly discharged over the entire length into the inside of the pipe lining material 9 to uniformly heat the pipe lining material 9 over the entire length. In addition, the temperature of the heating air and steam used for heating the pipe lining material 9 is set to 60 ° C to 130 ° C.

At the same time, the hot water in the hot water tank 32 is circulated through a hot water circulation hose 24 by a hot water pump 34, and is heated to a predetermined temperature by a boiler 35 on the way, and is circulated at a bottom of the pipe lining material 9. Hose 24
During the flow, the bottom in the pipe lining material 9 is heated, and the heated hot water is returned to the hot water tank 32, and the same operation is repeated thereafter.

Since the steam discharged from a discharge port (not shown) formed in the discharge hose 25 and used for heating the pipe lining material 9 is cooled to a temperature not higher than the saturation temperature, it is liquefied to form a pipe lining material. Even if hot water accumulated at the bottom of the pipe 9, the hot water was heated by the hot water flowing through the hot water circulation hose 24 inside the pipe lining material 9. or,
Since the heated air and steam flowing through the discharge hose 25 are also heated by the steam flowing through the steam hose 50 wound around a part of the discharge hose 25, the possibility that the steam is cooled below the saturation temperature and liquefied is reduced. Even if the steam is liquefied, the heat medium is not a single steam but a mixture of heated air and steam, and the steam occupies a small amount in this mixture. A large amount of hot water does not accumulate at the bottom of the inside.

The heated air and steam supplied for heating the pipe lining material 9 are sucked by the blower fan 39 and flow from the inside of the pipe lining material 9 to the fluid discharge hose 29, and from the fluid discharge hose 29 to the hot water tank 32. While flowing through the heat exchanger inside, it is reheated by heat exchange with hot water, and thereafter, similarly, the heating air and steam continuously circulate through the circulation path, so that the pipe lining material 9 is uniformly heated and heated by the heating air and steam. The thermosetting resin impregnated in the pipe lining material 9 is heated, and the hardened pipe lining material 9 lines and repairs the inner wall of the pipe 1.

In the pipe lining method according to the present invention, since the heating air and the steam are used as the heating medium for heating the pipe lining material 9, the specific heat of the heating medium is increased and the pipe lining material is increased. 9 is efficiently heated in a short time, and the heat generation of curing of the thermosetting resin is suppressed, the temperature rise of the pipe lining material 9 is prevented, and the heat shrinkage and residual stress generated in the pipe lining material 9 after curing. Can be suppressed to a small value, and a required lining can be reliably applied to a pipe having a reverse slope or a pipe that is loosened gently.

The pipe lining method according to the present invention employs a method of circulating heated air and steam as a heat medium in a closed loop circulation path, thereby realizing efficient heating without wasting heat energy. In addition, a circulating flow of heated air and steam is formed inside the pipe lining material 9 so that the pipe lining material 9 is uniformly heated and hardened.

Further, according to the pipe lining method of the present invention, the bottom of the pipe lining material 9 is heated by circulating hot water through the hot water circulation hose provided at the bottom of the pipe lining material 9. Even if hot water accumulates at the bottom of the pipe lining material 9 because the steam circulating inside the pipe lining material 9 is cooled below the saturation temperature and liquefied, the hot water is heated by the hot water flowing through the hot water circulation hose 24. In addition, partial curing failure of the pipe lining material 9 does not occur.

In the present embodiment, a single discharge hose 25 is used. However, a plurality of discharge hoses are used, and the heated air and steam are discharged from only the end portion of the hose. The heating efficiency may be increased by using a hose that discharges uniformly.

In this embodiment, the heating air and the steam in the heating section are heated by heat exchange with hot water. However, the heating air is heated to a predetermined temperature by heat exchange with hot oil instead of hot water. You may make it heat.

Further, in this embodiment, hot water is used as a heating fluid for heating the bottom of the pipe lining material 9, but hot oil, steam, or the like can be used as the heating fluid.

Although the present invention has been described with reference to an example in which the present invention is particularly applied to a pipe such as a sewer pipe constituting the main pipe, the present invention is similarly applied to a branch pipe or a manhole which joins the main pipe. Of course, it is possible.

[0058]

As is apparent from the above description, according to the present invention, after a tubular lining material made by impregnating an uncured thermosetting resin into a tubular resin adsorbent is inserted into a pipeline, the tubular sorbent is inserted into the tubular conduit. The pipe lining material is expanded by the fluid pressure supplied into the closed space including the inside of the pipe lining material and pressed against the inner wall of the pipe, and the pipe lining material is heated by a heat medium to impregnate the pipe lining material. In the pipe lining method in which the cured thermosetting resin is cured, a circulation path is formed including the enclosed space, a heating unit and a blowing unit, and these are heated and heated by using heated air and steam. By circulating in the circulation path, a circulating flow of heated air and steam was formed inside the pipe lining material, and the circulating heated air and steam heated the pipe lining material. Regardless of the shape of the pipe, the heat energy is effectively used to heat the pipe lining material to a predetermined temperature or less efficiently and in a short time to harden it. The heat shrinkage and residual heat generated in the hardened pipe lining material The effect is obtained that the stress can be kept small.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a reversing operation of a pipe lining material in a pipe lining method according to the present invention.

FIG. 2 is a sectional view of a tube lining material reversing device.

FIG. 3 is an enlarged sectional view of a portion A in FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a sectional view of an inverted end portion of the pipe lining material.

FIG. 6 is a cross-sectional view showing an operation of inverting a pipe lining material into a pipe in a pipe lining method according to the present invention.

FIG. 7 is a cross-sectional view illustrating a hardening operation of a pipe lining material in the pipe lining method according to the present invention.

FIG. 8 is an enlarged sectional view taken along line CC of FIG. 7;

[Explanation of symbols]

 1 Pipeline 9 Pipe Lining Material 9a Plastic Film 9b Tubular Resin Adsorbent 24 Hot Water Circulation Hose (Hot Fluid Circulation Hose) 25 Discharge Hose 29 Fluid Discharge Hose 32 Hot Water Tank 33 Heat Exchanger P 34 Hot Water Pump 35 Boiler 39 Blower Fan 50 Steam Hose S, S 'Closed space

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 592004301 All Co., Ltd. 1-194, Hayashi, Tokorozawa-shi, Saitama 4 (72) Inventor Takao Kamiyama 31-27 Daikancho, Hiratsuka-shi, Kanagawa Shonan Synthetic Resin Co., Ltd. In-house (72) Inventor Yasuhiro Yokoshima 175-3 Shinoyama, Ishishita-cho, Yuki-gun, Ibaraki Pref.Yokoshimanai Co., Ltd. (72) Inventor Shigeru Endo 2-12-4 Hanahata, Tsukuba, Ibaraki Pref. Inventor Hiroyuki Aoki 1-194, Hayashi, Tokorozawa-shi, Saitama F-term in all four companies (reference) 3H025 EA01 EB23 ED02 4F211 AA36 AD12 AD19 AD20 AD29 AG08 AH43 AK01 SA13 SA14 SC03 SD04 SH06 SJ01 SN03 SP12 SP15

Claims (7)

[Claims] 1. A fluid supplied into a closed space including the inside of a pipe lining material after a pipe lining material obtained by impregnating an uncured thermosetting resin into a tubular resin adsorbent is inserted into a pipe line. A pipe lining in which the pipe lining material is expanded by pressure and pressed against the inner wall of the pipe, and the pipe lining material is heated by a heating medium to cure the thermosetting resin impregnated therein. In the construction method, a circulation path is formed including the closed space, the heating section and the blowing section, and these are circulated in the circulation path using heated air and steam as the heat medium, and inside the pipe lining material. A pipe lining method, wherein a circulating flow of heated air and steam is formed to heat the pipe lining material by the circulating heated air and steam. 2. A discharge hose is provided at a bottom portion in the pipe lining material, and heated air and steam are discharged from a discharge port formed in the discharge hose into the inside of the pipe lining material. The pipe lining method according to claim 1. 3. A heat fluid circulation hose is provided at a bottom portion of the tube lining material, and a heat fluid is circulated through the heat fluid circulation hose to heat the bottom portion of the tube lining material. The pipe lining method according to claim 1. 4. The pipe lining method according to claim 3, wherein the heated air circulating in the circulation path and the steam are heated by heat exchange with the hot fluid circulating in the hot fluid circulation hose. 5. The pipe lining method according to claim 1, wherein the supply of the fluid pressure to the closed space is performed from outside the pipe lining material of the circulation path. 6. The pipe lining method according to claim 3, wherein the heat fluid circulation hose is constituted by a hose having a circular cross section having a resistance to an external force. 7. The pipe lining method according to claim 6, wherein said heat fluid circulation hose is constituted by a rubber hose.