JP2002001819A - Tube lining process as well as tube lining material and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a hard film of good quality not having a ruggedness on a surface of an inner wall of a pipeline, a tube lining material used for the method and a method for manufacturing the same. SOLUTION: An outer periphery of a tubular resin absorbing material 1 is covered with a thin film 2 having high sealability, and the material 1 is impregnated with a liquid-like curable resin while the film 2 is not adhered to the periphery of the material 1. The tube lining material L obtained in this manner is inverted and inserted into the pipeline 10, the curable resin is cured while the material remains closely contacted with the inner wall of the pipeline 10, and the film 2 is drawn from the pipeline 10 after its curing. Thus, the hard film of good quality not having the ruggedness is formed on the surface of the inner wall of the pipeline 10.

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 repairing a deteriorated pipe line, a pipe lining material suitable for such a pipe lining method, and a method for manufacturing the same. About.

[0002]

2. Description of the Related Art When sewage pipes and other pipes buried underground are deteriorated, a method of forming a hard coating on the inner wall surface of the pipes without excavating the pipes and repairing the pipes has already been known and has been put into practical use. Has been provided.

In such a pipe lining method, a pipe lining material obtained by impregnating mainly a thermosetting resin into a tubular resin absorbent material whose outer peripheral surface is coated with a highly airtight thin film is used. After being inserted into the pipeline with the fluid pressure of water or air while being inverted, the fluid was replaced with warm water while being pressed against the inner wall surface of the pipeline with the fluid pressure, and the resin was impregnated with the resin absorbent. The thermosetting resin is cured to form a hard coating of the pipe lining material on the inner wall surface of the pipe.

Here, as a method of manufacturing a pipe lining material used in the above-described pipe lining method, a band-shaped nonwoven fabric having a highly airtight thin film formed by coating a surface with a molten plastic is used. A method is known in which a tubular thin film is sewn on the outside and the seam is sealed with a band-shaped plastic film called a ribbon tape, and then the tubular resin absorbent made of the nonwoven fabric is impregnated with a liquid thermosetting resin. Can be

In addition, for example, Japanese Patent Publication No. 7-45182
Also, a method described in Japanese Patent Application Laid-Open Publication No. H10-26095 is known. In this method, the side edges of the band-shaped nonwoven fabric are sewn to form a tubular resin absorbent material, and after passing this through a tubular plastic film, the outer peripheral surface of the resin absorbent material is brought into close contact with the plastic film. The plastic film is heated to be bonded (heat-welded) to the outer peripheral surface of the resin absorbent, and then the resin absorbent is impregnated with a liquid thermosetting resin.

According to each of the above-mentioned methods, the thermosetting resin is applied to the resin absorbent while maintaining the airtightness of the inside by the action of the highly airtight thin film formed on the outer peripheral surface of the resin absorbent. Can be satisfactorily impregnated, and the thin film made of plastic film is inverted to the inner peripheral side when inserted into the pipe, so that the thermosetting resin can be impregnated. Leakage into the road can be prevented.

[0007]

However, since the above-mentioned pipe lining material has a plastic film (thin film) as an outer layer adhered (heat-welded) to the outer peripheral surface of the resin absorbent material, the pipe lining material is not connected to the pipe line. When inserted inside, the thin film appearing on the inside is loosened by the difference between the inner and outer diameters, and the resin absorbent bonded to the thin film is attracted to the inner peripheral side to generate wrinkles. Since the thermosetting resin is cured in that state, irregularities of various sizes are formed on the repair surface, which not only deteriorates the flowability of sewage and the like flowing through the inside, but also impairs the appearance. was there.

In addition, since the plastic film remains on the inner wall surface of the conduit while adhering to the resin absorbent, a part of the plastic film is gradually peeled off by being exposed to sewage or the like, and the peeled off pieces form the conduit. There was a risk of clogging.

The present invention has been made in view of the above circumstances, and a main object of the present invention is to provide a high-quality hard coating without unevenness on the inner wall surface of a pipeline.

[0010]

In order to achieve the above object, the present invention provides a pipe lining method, a pipe lining material, and a method for manufacturing the same as described below. (1) A tubular resin absorbent that can be impregnated with a liquid curable resin is passed through a tubular highly airtight thin film, and the resin is absorbed without adhering the thin film to the outer peripheral surface of the resin absorbent. Using a pipe lining material made by impregnating a liquid curable resin into the material, inserting it while inverting it into the pipeline by the pressure of the fluid, while pressing the pipe lining material against the inner wall surface of the pipeline, A curable resin impregnated in the resin absorbent material is cured, and after the curing, the thin film is pulled out from the inside of the resin absorbent material and removed, thereby removing the resin film. (2) A pipe lining material obtained by impregnating a liquid curable resin into a tubular resin absorbent material, wherein the outer periphery of the resin absorbent material is covered with a highly airtight thin film made of a plastic film;
A tube lining material obtained by impregnating the resin absorbent with the curable resin without bonding the thin film to the outer peripheral surface of the resin absorbent. (3) The pipe lining material according to the above (2), wherein the thin film has a three-layer structure, the inner layer and the outer layer are made of polyethylene, and the intermediate layer is made of a polyamide-based synthetic polymer. (4) A tubular resin absorbent that can be impregnated with a liquid curable resin is passed through a tubular highly airtight thin film, and the resin is absorbed without adhering the thin film to the outer peripheral surface of the resin absorbent. A method for producing a pipe lining material, comprising impregnating a material with a liquid curable resin.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a perspective view showing a pipe lining material L according to the present invention in a partially broken manner.
FIG. 2 shows a cross section taken along line XX in FIG. This pipe lining material L is used for lining a pipe such as a sewer, one end of which is opened, and the other end of which is used to prevent leakage of a fluid used for reversely inserting the pipe into the pipe. It is sealed. Here, reference numeral 1 denotes a flexible tubular resin absorbent made of fibrous material.
Is a non-woven fabric or a sheet-like woven fabric made by bonding fibers such as polyester, polyethylene, polypropylene, polyurethane, acrylic, polyamide-based synthetic polymer (nylon), vinylon, rayon, glass, carbon, or cotton in a sheet shape Is formed into a tubular shape by suturing both side edges thereof, or the above-mentioned fibers are extruded using an extruder such as an extruder to be integrally formed into a seamless tubular shape.

The resin absorbent 1 is impregnated with an uncured curable resin, which maintains a liquid state of about 5 to 10 kg per square meter, by a method described later. As the curable resin, a photocurable resin (ultraviolet curable resin) obtained by adding a photosensitizer such as benzophenone to an acrylate or epoxy compound can be used. resin,
Alternatively, a thermosetting resin such as a urethane resin is used.

On the other hand, reference numeral 2 denotes a highly airtight thin film made of a plastic film covering the outer periphery of the resin absorbent 1. This thin film 2 has a diameter equal to or slightly larger than the outer diameter of the resin absorbent by an inflation method. Alternatively, a sheet-like material may be wound around the outer periphery of the resin absorbent 1 and then heat-sealed at the side edges thereof. The thin film 2 may have a single-layer structure made of a thermoplastic resin such as polyethylene, polyvinyl chloride, or polyurethane. In this embodiment, the thin film 2 has a three-layer structure as shown in FIG. Particularly, the inner layer 2A and the outer layer 2B are made of polyethylene, and the intermediate layer 2C is made of a polyamide-based synthetic polymer (nylon). These layers are integrated by a co-extrusion method or a laminating method.

Here, the pipe lining material L according to the present invention
Instead of bonding the thin film 2 to the outer peripheral surface of the resin absorbent 1 by heating or bonding with an adhesive as described above, the outer periphery of the resin absorbent 1 is thinned. 2 and is provided so as to be separable without adhering to the outer peripheral surface of the resin absorbent 1, and the resin absorbent 1 is impregnated with the liquid curable resin as described above in that state. You.

Hereinafter, a preferred manufacturing method will be described.
First, as shown in FIG. 4, a tubular resin absorbent 1 having a seamless or seam as described above is passed through a tubular highly airtight thin film 2 made of a plastic film or the like. Here, the thin film 2 is, for example, a three-layer tubular plastic film in which an intermediate layer made of a polyamide-based synthetic polymer (nylon) is provided between the inner and outer layers made of polyethylene as described above. The length is set to be equal to or slightly larger than the outer diameter of the resin absorbent 1 as shown in FIG. And
After covering the entire outer periphery of the resin absorbent material 1 with such a thin film 2 over its entire length, the resin absorbent material 1 is impregnated with a liquid curable resin (the thermosetting resin as described above in this example). .

In particular, in the present invention, the thin film 2 is not adhered to the outer peripheral surface of the resin absorbent material 1 by heating or using an adhesive. The material 1 is impregnated with a thermosetting resin. Note that, even after the resin absorbent 1 is impregnated with the liquid thermosetting resin, the inner peripheral surface of the thin film 2 or the outer peripheral surface of the resin absorbent 1 is previously formed so that the thermosetting resin does not have a function as an adhesive. It is preferable to form a release layer between the resin absorbent 1 and the thin film 2 by applying a release agent such as silicone, fluorine-based oil, high melting point wax, fatty acid, or surfactant.

Here, in order to impregnate the resin absorbing material 1 with a liquid thermosetting resin, first, as shown in FIG. 5, both ends of a thin film 2 which is separably provided on the outer periphery of the resin absorbing material 1 are closed, A vacuum pump V is connected to one end via a vacuum hose 3. In FIG. 5, one end of the thin film 2 is sealed with the adhesive tape 4, the other end is protruded from one end of the resin absorbent material 1, and the protruding portion is heat-sealed while leaving the intake port 5 in a part thereof. The state is shown. Then, according to the present example, while the resin absorbing material 1 is evacuated by the vacuum pump V by connecting the vacuum hose 3 to the suction port 5 or the like, the liquid thermosetting resin is injected from one end on the opposite side. Then, this is impregnated over the entire length of the resin absorbent material 1.

For example, as shown in FIG. 6, one end of the resin absorbent material 1 is clamped by a fastener 6 so that outside air does not flow in on the injection side of the thermosetting resin, and then the adhesive tape 4 is peeled off.
After opening one end of the resin absorbent material 1 and injecting a predetermined amount of thermosetting resin into the inside thereof, the injection port 7 is sealed again with an adhesive tape or the like, and the fastener 6 is removed.
Return to the state. Thereafter, as shown in FIG. 7, this is passed through the rolling roller R from one end into which the thermosetting resin is injected, and is pressed. As a result, the thermosetting resin r is fed into the resin absorbent 1 while being impregnated by the suction force of the vacuum pump V and the pressing force of the rolling roller R, and the thermosetting resin r is extended by the resin. It will be impregnated over the entire length of the absorbent material 1. After the impregnation with the thermosetting resin r, the vacuum hose 3 is removed from the air inlet 5, and the air inlet 5 is sealed by heat welding or the like (sealing portion 8 shown in FIG. 1), and the opposite side is sealed. By removing a sealing material such as an adhesive tape 4 provided at one end, a pipe lining material L as shown in FIG. 1 in which the outer periphery of the resin absorbing material 1 is covered with a separable thin film 2 is obtained.

Here, in the pipe lining method according to the present invention, a high quality hard coating can be formed on the inner wall surface of the pipe using the pipe lining material L obtained as described above. Hereinafter, a preferred example will be described. FIG. 8 is a schematic view thereof. In FIG. 8, reference numeral 10 denotes a pipe buried underground such as a sewer, and 11 denotes a manhole (pit) communicating with the pipe. Show. Before use, the pipe lining material L is folded into a belt shape and kept cool, and is inserted into the pipe 10 while being inverted by fluid pressure as described later during use.

To reversely insert the pipe lining material L into the pipe 10, for example, as shown in FIG. 8, a bend-shaped base 12 having different diameters at both ends is used, and the pipe lining material L is passed through the base 12. One end on the open side is turned outward and attached to the outer periphery of the small diameter portion 12A of the base, and the extension tube 14 is connected to the large diameter portion 12B of the base via the joint 13. A hot water hose 15 is connected to one end (end) of the pipe lining material L on the sealing side in advance. Then, as shown in FIG. 8, the base 12 is lowered from the ground to the bottom of the manhole 11, and the small-diameter portion 12A to which one end of the pipe lining material L is attached is directed to the entrance of the pipeline 10, while the large diameter of the base is The extension tube 14 connected to the portion 12B via the joint 13 is raised from the manhole 11 on the ground, and the cylindrical metal fitting 16 attached to one end on the upper side thereof is horizontally supported by a portion of a gantry (not shown).

Then, in this state, water is poured into the extension tube 14 from the ground, and the water is supplied from the large diameter portion 12B to the inside of the base 12 through the extension tube 14. Then, as shown in FIG. 9, the pipe lining material L is inserted into the pipe 10 while being inverted by receiving the water pressure, and the hot water hose 15 connected to the end thereof is also connected to the inside of the pipe lining material L. Is drawn into the pipeline 10 while crawling. In particular, at this time, since the pipe lining material L receives a very large pressure from the large-diameter portion 12B side due to a large amount of water supplied into the extension tube 14, the reversal of the pipe lining material L is not interrupted.
0, the hot water hose 15 can be smoothly inserted from the ground to the inversion end (one end sealing portion 8) of the pipe lining material L when the inversion is completed.

Here, the pipe lining material L is firmly adhered to the inner wall surface of the pipe 10 while receiving a large water pressure from the large diameter portion 12B side of the base 12, but it is preferable that the pipe lining be combined with air pressure. The internal pressure of the material L is further increased. Specifically, as shown in FIG. 9, a pressure lid 17 having a hot water hose 15 penetrated is attached to the upper opening of the fitting 16 to form a closed space S on the water surface of the extension tube 14, and the closed space S Compressed air is supplied from the compressor C through the pressure lid 17 so that the pipe lining material L is strongly pressed against the inner wall surface of the pipe 10 by water pressure and air pressure.

In particular, when the pipe lining material L is inverted into the pipe 10, the thin film 2 shifts from the outer peripheral side to the inner peripheral side of the resin absorbent 1 as shown in FIG. However, since the thin film 2 is not bonded to the outer peripheral surface of the resin absorbent material 1 as described above, the resin absorbent material 1 comes into close contact with the inner wall surface of the pipe 10 without wrinkling. .

Therefore, while maintaining that state, hot water is supplied to the inside of the lining material L through the hot water hose 15 as shown in FIG. Due to the pressure of the water filling the lining material L and the air in the closed space S, the water stored in the lining material L is sent to the boiler B through the drain pipe 18 and is heated by the boiler B. The hot water is re-sent from the pump P through the hot water hose 15 to the inside of the pipe lining material L. Then, the pipe lining material L is heated by the circulating warm water, and the thermosetting resin impregnated in the resin absorbing material 1 is cured.

After the curing, the hot water in the pipe lining material L is drawn out, and then the hot water hose 15 connected to one end of the pipe lining material L (one end sealing portion 8 of the thin film) as shown in FIG. By utilizing this and pulling it from the ground, the whole of the thin film 2 is pulled out from the pipe 10 and removed, while the thin film 2 is inverted. As a result, a high-quality hard coating without unevenness is formed on the inner wall surface of the pipe 10 by the resin absorbent 1 cured together with the thermosetting resin.

When the thermosetting resin is cured, the thermosetting resin may be used as an adhesive layer and the thin film 2 may adhere to the resin absorbing material 1. In this case as well, as shown in FIG.
By pulling while inverting the thin film 2 along, the thin film 2 can be easily peeled. Here, FIG. 11 shows an example in which the hot water hose 15 is used for peeling the thin film 2, but instead of this, a rope or other flexible wire is used, and this is used before the pipe lining material L is inverted. Hot water hose 15
And one end of the thin film 2 may be connected to the sealing portion 8.

Further, as described above, a release agent is applied to the inner peripheral surface of the thin film 2 and the outer peripheral surface of the resin absorbent 1 in advance, and a release layer is formed between them to thereby form the thermosetting resin. Since the adhesion between the thin film 2 and the resin absorbing material 1 due to curing can be completely prevented, in this case, the base 12 shown in FIG.
The thin film 2 can be pulled out directly from the conduit 10 by pulling the connection side of the thin film 2.

Although the application example of the present invention has been described above, the present invention is not limited to the pipe lining material for the main pipe, but is applied to a pipe lining material in which a flange is formed at one end of the resin absorbent material 1, and the inner wall surface of the branch pipe is formed. Can form a similar high-quality hard coating.

[0029]

As is apparent from the above description, the pipe lining material according to the present invention covers the outer periphery of the resin absorbent with a highly airtight thin film, and adheres this to the outer peripheral surface of the resin absorbent. Since the resin absorbent is impregnated with the liquid curable resin, it is inserted into the conduit upside down, so that even if the thin film moves to the inner peripheral side and becomes loose, the resin absorbent is not loosened inside the conduit. Because it can be in close contact with the wall surface, it is possible to form a high-quality hard coating without unevenness on the inner wall surface of the pipe, and after the resin absorbent is cured, the thin film is pulled out from the pipe and removed. Further, there is no fear that a part of the thin film is peeled off after the construction as in the related art and the pipe is clogged.

Further, since the thin film has a three-layer structure of a polyamide-based synthetic polymer and polyethylene sandwiching the thin film, there is no danger of being damaged during use due to high strength. There is no worry about resin leaking out.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pipe lining material according to the present invention in a partially broken manner.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a partially enlarged sectional view of a thin film.

FIG. 4 is a perspective view showing a state in which a tubular resin absorbent is passed through a tubular thin film.

FIG. 5 is a first process diagram showing an example of impregnating a resin absorbent with a liquid curable resin.

FIG. 6 is a second process diagram showing an example of impregnating the resin absorbent with a liquid curable resin.

FIG. 7 is a third process diagram showing an example of impregnating the resin absorbent with a liquid curable resin.

FIG. 8 is a schematic view showing a state before a pipe lining material is inserted into a pipe in a reverse manner.

FIG. 9 is a schematic view showing a state in which a pipe lining material is invertedly inserted into a pipe.

FIG. 10 is a schematic cross-sectional view of a pipe line into which a pipe lining material has been inverted and inserted

FIG. 11 is a schematic view showing an example in which a thin film is pulled out of a pipe.

[Explanation of symbols]

 L Pipe lining material V Vacuum pump 1 Resin absorbing material 2 Thin film 2A Inner layer 2B Outer layer 2C Intermediate layer 3 Vacuum hose 5 Inlet 10 Pipe line 11 Manhole 12 Base (nozzle for reversing pipe lining material) 15 Hot water hole (for extracting thin film) Dual purpose)

Claims (4)

[Claims] 1. A tubular resin absorbent material that can be impregnated with a liquid curable resin is passed through a tubular highly airtight thin film,
A pipe lining material made by impregnating the resin absorbing material with a liquid curable resin without adhering the thin film to the outer peripheral surface of the resin absorbing material is used. After that, the curable resin impregnated in the resin absorbent is cured while the pipe lining material is pressed against the inner wall surface of the conduit, and after the curing, the thin film is pulled out and removed from the inside of the resin absorbent. A pipe lining method characterized by the following. 2. A tube lining material comprising a tubular resin absorbent material impregnated with a liquid curable resin, wherein the outer periphery of the resin absorbent material is covered with a highly airtight thin film made of a plastic film. A tube lining material obtained by impregnating the resin absorbent material with the curable resin without adhering to the outer peripheral surface of the resin absorbent material. 3. The pipe lining material according to claim 2, wherein the thin film has a three-layer structure, the inner layer and the outer layer are made of polyethylene, and the intermediate layer is made of a polyamide-based synthetic polymer. 4. A tubular resin absorbent that can be impregnated with a liquid curable resin is passed through a tubular highly airtight thin film,
A method of manufacturing a pipe lining material, comprising impregnating a liquid curable resin into the resin absorbent without bonding the thin film to the outer peripheral surface of the resin absorbent.