JP2002219754A - Method for regenerating pipe line and regeneration material used in the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for regenerating a pipe line which can regenerate its inner wall while controlling curing nonuniformity without needing a large apparatus for circulating a large amount of hot water and a regeneration material used in the method. SOLUTION: The regeneration material containing a curable resin and an electromagnetic wave absorbing agent which absorbs energy by the radiation with electromagnetic waves and transmits the absorbed energy to the resin is used. In the method for regenerating the pipe line, the regeneration material is fitted to the inner wall regeneration part of the pipe line and irradiated with the electromagnetic waves so that the energy of the electromagnetic waves is absorbed by the agent, and the resin is cured by the absorbed energy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline for curing a rehabilitating material by irradiating the rehabilitating material with electromagnetic waves by applying the rehabilitating material hardened by irradiation of electromagnetic waves to an inner wall rehabilitating portion of a pipe such as a water distribution pipe. And a rehabilitating material used therefor.

[0002]

2. Description of the Related Art Conventionally, while a flexible tubular rehabilitating material is pressed and held on the inner wall of an underground pipe, the rehabilitating material is hardened to form a new pipeline with a liner inside the pipeline. Various pipe rehabilitation methods have been proposed. For example, a thermosetting resin is used as a component of the rehabilitating material, and the thermosetting resin is heated and cured by circulating warm water, or a photocuring resin is used as a component of the rehabilitating material. The photocurable resin is cured by irradiating light with ultraviolet irradiation means. According to these methods, since the rehabilitating material is flexible, it can be constructed on site, and can form a liner having the necessary strength as a self-supporting pipe.

[0003]

Here, according to the former method of curing by heating, a retread material containing a thermosetting resin blended with a thermally decomposable polymerization initiator such as an organic peroxide. Is used, warm water is circulated inside the rehabilitating material, and the temperature of the rehabilitating material is increased by heat transfer from the hot water to initiate a curing reaction. For this reason, it is necessary to keep this regenerated material cool and stored so that the polymerization initiator does not function. In addition, when working on site, it is necessary to raise the temperature of the rehabilitated material to the temperature required for curing, and especially when the pipe diameter is large, it is necessary to circulate a large amount of hot water for a long time. There was a problem that, in addition to the large-scale on-site work, equipment for supplying a large amount of hot water was also large-scale.

[0004] On the other hand, according to the latter curing method of irradiating light, if the predetermined light is blocked, the rehabilitating material is stable and the handling property in the storage state is improved. In addition, since the curing reaction proceeds promptly by irradiating light, the working time is greatly reduced as compared with the former method. However, the heat generated by the ultraviolet irradiation device causes a part of the rehabilitating material to be cured without the use of light, causing uneven curing. There was a problem in that the liner was uneven, and in some cases, the liner was apt to crack. Further, according to the method using the ultraviolet irradiation, when the thickness of the rehabilitating material is increased, there is also a problem that the transmission of the ultraviolet light is hindered, and poor curing is easily caused.

[0005] A method for eliminating the uneven curing in the light curing has also been proposed. For example, Japanese Patent Application Laid-Open No. 9-131791
According to the publication, using a retread material containing a thermosetting resin containing a thermosetting and a photo-curing agent, and after heating and curing until the retread material can maintain its shape, the both ends of the retread material are cut off. A method of repairing a pipeline with less curing unevenness by releasing the inner periphery of a retread material and performing photocuring is disclosed.

However, since this method uses both heat curing and light curing, the problem that the apparatus requires a heat curing apparatus and a light curing apparatus and the equipment becomes large is not solved.

[0007] Pipes to be repaired or rehabilitated have various types, such as size, shape, and installation conditions.
Simplification of repair equipment is desired.

Accordingly, an object of the present invention is to provide a pipe rehabilitation method capable of rehabilitating an inner wall with less curing unevenness without requiring large-scale facilities such as circulating a large amount of hot water, and a rehabilitation material used therefor. And

[0009]

In order to achieve this object, a first aspect of the present invention is to provide a curable resin which is cured by absorbing the energy of an electromagnetic wave, and absorbs the energy by irradiating the electromagnetic wave with the resin. Using a rehabilitation material containing an electromagnetic wave absorber that transmits energy to the curable resin, applying the rehabilitation material to an inner wall rehabilitation portion of a pipeline to irradiate the rehabilitation material with an electromagnetic wave, thereby applying electromagnetic wave energy to the electromagnetic wave absorber. A method for rehabilitating a pipeline, comprising absorbing the resin and curing the curable resin with the absorbed energy.

[0010] According to this structure, the pipe to be rehabilitated contains a curable resin and an electromagnetic wave absorber that absorbs energy by irradiating the electromagnetic wave and transmits the absorbed energy to the curable resin. The material is applied to the inner wall rehabilitation part of the pipeline, and the rehabilitation material is irradiated with electromagnetic waves to cure the rehabilitation material, so that large-scale facilities such as circulating a large amount of warm water are not required, and curing is also possible. The present invention provides a pipe rehabilitation method capable of rehabilitating an inner wall with less curing unevenness because the progress is made by heat.

According to a second aspect of the present invention, the curable resin is a thermosetting resin, and the thermosetting resin is cured by heat from the electromagnetic wave absorber. This is a method of rehabilitating the pipeline.

According to this structure, in addition to the effect of the first aspect, even if the thermosetting resin has low electromagnetic wave absorption,
Since the thermosetting resin is cured by the heat from the electromagnetic wave absorber, the curing proceeds efficiently. Here, a thermoplastic resin is also used as the resin that is cured by heating according to claim 1 or 2, and the thermoplastic resin is softened or melted by being heated to a high temperature, for example, naturally cooled and cured to form a liner. It is formed, but if a thermosetting resin is used,
A liner having excellent mechanical strength can be obtained as compared with a thermoplastic resin.

The invention according to claim 3 is the method for rehabilitating a pipeline according to claim 1, wherein the electromagnetic wave is infrared light or microwave.

[0014] According to this structure, the rehabilitating material is efficiently heated by infrared light or microwaves to increase the temperature, thereby shortening the working time.

According to a fourth aspect of the present invention, the rehabilitating material has a flexible tubular shape, and the rehabilitating material is disposed in the conduit, and a pressure is formed in the rehabilitating material in a substantially sealed state. The conduit according to any one of claims 1 to 3, wherein the electromagnetic wave is irradiated in a state where the medium is sealed, the rehabilitating material is pushed out from the inner surface and pressed against the inner wall of the conduit. It is a rehabilitation method.

According to this structure, in addition to the functions and effects of any one of the first to third aspects, a tubular flexible rehabilitating material is disposed in the pipe, and is substantially sealed. By irradiating electromagnetic waves in a state where the pressure medium is sealed in the rehabilitation material and the rehabilitation material is pushed out from the inner surface and pressed against the inner wall,
The rehabilitating material can be hardened along the inner wall of the pipeline by a simple operation.

According to a fifth aspect of the present invention, there is provided a flexible resin containing a curable resin and an electromagnetic wave absorber for transmitting energy to the curable resin by absorbing energy by irradiating the curable resin and electromagnetic waves with or around the film or sheet. A rehabilitating material for a pipeline characterized by being composed of a flexible cylindrical body.

According to this structure, the pipe to be rehabilitated contains a curable resin and an electromagnetic wave absorber that absorbs energy by irradiating the electromagnetic wave and transmits the absorbed energy to the curable resin. The material is applied to the inner wall rehabilitation part of the pipeline, and the rehabilitation material is irradiated with electromagnetic waves to cure the rehabilitation material.

Since heating can be performed by electromagnetic waves, large-scale equipment such as circulating a large amount of hot water is not required, and curing is progressed by heat, so that curing unevenness is small.

According to a sixth aspect of the present invention, the electromagnetic wave absorber is a metal or a metal oxide.
It is a rehabilitation material for the pipeline described.

According to this structure, in addition to the effect of the fifth aspect, the electromagnetic wave absorbing agent is a metal or a metal oxide, so that the electromagnetic wave absorbing agent is efficiently absorbed.

According to a seventh aspect of the present invention, there is provided the pipe rehabilitating material according to the fifth or sixth aspect, wherein the curable resin is a thermosetting resin.

According to this structure, in addition to the effect of the fifth or sixth aspect, even if the thermosetting resin has low electromagnetic wave absorption, the thermosetting resin is cured by heat from the electromagnetic wave absorber. If the curing proceeds efficiently and a thermosetting resin is used, a liner having excellent mechanical strength can be obtained as compared with a thermoplastic resin.

[0024]

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

FIG. 1 is an explanatory view showing an example of a pipeline 1 to be rehabilitated by the rehabilitation method according to the present invention. This line 1
Is a pipe buried in the ground for flowing sewage or for another purpose, and also bridged over a bridge, and is a pipe type, a pipe diameter, and a pipe of the underground pipe 10 forming the pipe 1. It is free to choose any shape. For example, they are a concrete fume tube or a ceramic pottery tube as a unit. Further, the shape is not limited to the illustrated circular tube, and may be an oval shape or a rectangular shape.

The pipe 1 can be accessed from the ground through manholes 11 and 12.
In the underground pipe 10, a crack 10a is formed over the entire pipe line 1 for some reason. In the embodiment of the present invention, the crack 10a is repaired (rehabilitated) as a repaired portion (inner wall rehabilitation portion). It shall be.

The rehabilitation of the present invention refers to the crack 10a
Not only the repair, but also the rehabilitation of an old pipe which is not cracked and may be rehabilitated when a liner as a self-standing pipe is provided on the inner surface of a new pipe for some reason. Moreover, as long as one end can be accessed from the ground, both ends of the pipeline 1 may not necessarily be accessible from the ground.

For repairing a crack 10a in the entire pipeline 1, a liner 13 as a long repair material having a tubular shape as shown in FIG. 2 is used. This liner 1
3 is schematically constituted by, for example, a base hose 14 and a calibration hose 15;
Reference numeral 4 denotes an outer layer impervious film (or sheet) 16 and an outer layer resin impregnated felt 17 impregnated with a curable resin containing an electromagnetic wave absorbing agent fixed to the film. It is composed of a conductive film (or sheet) 19 and an inner resin absorbing felt 18 impregnated with a curable resin containing an electromagnetic wave absorbing agent fixed thereto.

The outer layer impermeable film 16 has impermeability so that the uncured curable resin does not permeate or evaporate,
An appropriate material can be selected from the viewpoint of durability and cost. Specifically, for example, polyolefins such as polyethylene and polypropylene are exemplified.

The inner layer impermeable film 19 is also impermeable so that the uncured curable resin does not permeate or evaporate, and can be irradiated with electromagnetic waves from the inner surface side of the liner 13 toward the curable resin. An appropriate material is selected in consideration of the smoothness of the finished inner surface, scratch resistance, durability, and the like. For example, polyurethane, polyamide and the like are used.

The curable resin is appropriately selected in consideration of the durability, mechanical properties, handleability, cost and the like of the liner 13, and examples thereof include thermosetting resins such as unsaturated polyester resins and epoxy resins. As a typical resin.

These curable resins are used after being impregnated with felt made of organic or inorganic fibers such as polyester, nylon, acrylic, vinylon, carbon fiber and glass fiber. Of course, the type of fibrous base material such as these felts is not limited to this, and knitted fabric, nonwoven fabric,
It may be a fabric such as a web or a mat or a laminate thereof. The liner 13 is reinforced by the fibrous base material to increase mechanical strength such as bending strength and bending elasticity. In addition,
The liner 13 is flexible when impregnated with a curable resin. For example, the tubular liner 13 can be folded flat or rolled up and stored.

Examples of suitable electromagnetic wave absorbers include metal oxides in addition to general metals. For example, a perovskite-type composite oxide, iron oxide, manganese oxide, and cobalt oxide may generate heat in a very short time when irradiated with microwaves.

The amounts of these electromagnetic wave absorbers are appropriately set. If the amount is too small, the ability to absorb electromagnetic waves is not sufficient. If the amount is too large, the physical properties of the liner 13 may be impaired.

Also, regardless of the shape of these electromagnetic wave absorbers, they are blended when various blending agents such as a polymerization initiator are blended with the liquid curable resin.

This liner 13 is, as shown in FIG.
It is disposed in the pipeline 1 to be repaired, and has the tip 13a and the front end 1a.
Each of the pressurizing units 3b is tightened while being kept airtight by a plug 21 or the like, and a pressurizing unit 3 for sending out compressed air to a front end 13b, and an exhaust unit 4 at a front end 13a. In addition, an electric cable 30 is inserted into the front end 13b so that the liner 13 can be inserted into the plug 21 in a state where the airtightness of the liner 13 is maintained, and the front end 13a can be wound around a winch 25 via a roller 23 or the like. A simple rope 26 is inserted through the plug 21 in a state where the airtightness of the liner is maintained.

The tip of the electric cable 30 and the rope 26
Irradiating means 50 is connected to both. This irradiation means 50
Is mounted on a carriage provided with a plurality of wheels 51 and includes an electromagnetic wave generating means 52 for generating electromagnetic waves such as microwaves (high frequency) of several GHz, and a microwave irradiating section 53. Control equipment 40 via
It is connected to the. The control equipment 40 cuts off the amount of electromagnetic waves and adjusts the amount of electromagnetic waves for curing the liner 13 as a repair material (or a rehabilitating material).

By being pulled by the rope 26 or the electric cable 30, the irradiation means 50 runs or slides down the liner 13. As a result, the electromagnetic wave radiated from the irradiating means 50 is swept along the longitudinal direction of the pipe while the electromagnetic waves radiated almost uniformly to the inner surface of the liner 13.

By operating the pressurizing unit 3 using such a device, compressed air is generated, and the liner 13 is expanded, whereby the liner 13 is pressed against the inner wall 10 b of the underground pipe 10. When the uncured liner 13 is pressed against the inner wall and the control equipment 40 is operated to irradiate an electromagnetic wave with the irradiating means 50, the electromagnetic wave absorber of the liner 13 absorbs the electromagnetic wave and is excited to generate heat. The exothermic energy raises the temperature of the liner 13 from the inside, and the curing of the thermosetting resin proceeds. As a result, the liner 13 is formed as a free-standing pipe shown in FIG. 2, and a new pipe line 2 is formed.

Next, an example of the repair work according to the present invention will be described.

First, an appropriate material suitable for the purpose is prepared. As the material, the material of the base hose 14 and the calibration hose 15 is selected according to the diameter, shape, and length of the sewer pipe at the construction site, and cut into appropriate lengths.

Next, a curable resin containing an electromagnetic wave absorbing agent to be impregnated is mixed and adjusted.
The felt layers of the base hose 14 and the calibration hose 15 are impregnated. When the base hose 14 is sufficiently impregnated with the curable resin, the impregnation of the calibration hose 15 may be omitted.

The inside and outside of the calibration hose 15 are inverted, inserted into the inside of the base hose 14, and the irradiation means 50 is introduced inside these. This allows
The liner 13 includes an outer layer impermeable film (or sheet) 16 from the outer layer, an outer layer resin impregnated felt 17 impregnated with a curable resin, an inner layer resin absorbing felt 18 impregnated with a curable resin, and an inner layer impermeable film (or sheet). Or sheet)
19 is laminated, and an impermeable film (or sheet) is laminated on the inner and outer layers of the cylinder to prevent the resin inside from leaking out of the cylinder. . Further, since the inner layer impermeable film 19 is permeable to electromagnetic waves, the irradiated electromagnetic wave passes through the inner layer impermeable film 19 and absorbs the electromagnetic waves contained in the outer resin impregnated felt 17 and the inner resin absorbing felt 18. It can be absorbed by the agent.

The liner 13 is transported to the construction site in a state where the tubular body is folded flat and rolled up or folded for ease of transportation and construction, and stacked. Of course, these series of operations including the step of impregnating the curable resin may be performed at the work site.

On the other hand, at the construction site, preparations for construction are started, cleaning of the inside of the pipeline 1 and inspection with a television camera are performed, and it is confirmed whether or not there is any part that is not suitable for repair.

Next, the liner 13 is transported from the transport vehicle and is drawn into the pipeline 1 by the winch 25 or the like. Here, since the liner 13 is folded, the liner 13 can be easily disposed in the pipeline 1 in a state where the cross-sectional area is reduced. In addition, this folded state is usually a state in which the cylindrical body is simply crushed and flattened.
Multiple folding may be used. It is sufficient that the liner 13 is guided into the conduit 1, and the liner 13 may be introduced into the manhole 11 in a partially expanded state, and the form is not limited.

Then, when the pressurizing unit 3 pressurizes the folded liner 13 with compressed air or the like,
The liner 13 is expanded in diameter. Then, while maintaining the pressure, power is supplied from the control equipment 40 and the irradiation unit 50 irradiates the inner surface of the liner 13 with an electromagnetic wave. The electromagnetic wave absorber of the liner 13 absorbs the electromagnetic wave, and the electromagnetic wave becomes heat energy, which is radiated toward the surrounding thermosetting resin, whereby the curing of the thermosetting resin proceeds, and the liner 13 is cured from the inside. Be advanced.

When the curing is completed, the irradiation position is shifted by pulling the rope 26 by the winch 25, and the entire inside of the liner 13 is cured. As a result, the liner 13 expands in the radial direction of the pipeline 1 and is hardened in a pressed state on the inner peripheral surface of the underground pipe 10 to form the pipe-shaped liner 13 as a free-standing pipe.

After the stage at which the strength of the liner becomes appropriate, the inside of the liner 13 is appropriately exhausted. If the pipe port is finally finished and there is a branch, etc., the installation pipe is pierced to attach the branch, and the final confirmation is made and cleared.

As a result, a highly rigid repair structure hardened in a cylindrical shape with a synthetic resin having the required strength is formed in close contact with the inner wall of the new pipeline 2, and the portion where the crack 10a exists can be repaired. .

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design may be changed without departing from the scope of the present invention. The present invention is also included in the present invention.

For example, the liner 13 is composed of four layers consisting of a two-layer calibration hose and a two-layer base hose. For example, the liner 13 has a tubular cloth whose outer surface is covered with a highly airtight plastic film. It may have a three-layer structure in which a curable resin is impregnated, or may have a multilayer structure of five or more layers.

Although the electromagnetic waves required for curing have been described using microwaves, the present invention is not limited to this, and electromagnetic waves can be widely used. For example, infrared light that emits heat rays or ultraviolet light may be used. Furthermore, these may be laser beams, or may be irradiated with a variable wavelength.

[0054]

As described above, according to the present invention, in a pipeline to be rehabilitated, a curable resin that absorbs and cures the energy of electromagnetic waves and absorbs energy by irradiation with electromagnetic waves. A rehabilitation material containing an electromagnetic wave absorber that transmits the absorbed energy to the curable resin is applied to the inner wall rehabilitation part of the pipeline, and this rehabilitation material is irradiated with electromagnetic waves to cure the rehabilitation material, so a large amount of hot water is circulated The present invention provides a pipe rehabilitation method capable of rehabilitating an inner wall with less curing unevenness because curing is advanced by heat without requiring a large-scale facility such as performing a hardening operation.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a pipe to be repaired according to an embodiment in a pipe rehabilitation method according to the present invention.

FIG. 2 is an explanatory view showing a liner used for repairing the pipeline of FIG. 1;

FIG. 3 is an explanatory view showing a state where a liner put in a pipeline is expanded with air and pressed against the pipeline.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing pipe line 2 Rehabilitated pipe line 10 Underground pipe 10a Crack (inner wall rehabilitation part) 13 Liner (rehabilitation material, repair material) 50 Irradiation means (irradiation device)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F211 AB13 AB16 AD12 AD19 AG03 AG08 AH43 AJ08 AK03 AK04 SA13 SC03 SD04 SD11 SD23 SH06 SH24 SN03 SP26 SP29

Claims (7)

[Claims] 1. A retread material containing a curable resin that is cured by absorbing energy of an electromagnetic wave and an electromagnetic wave absorber that absorbs energy by irradiating the electromagnetic wave and transmits the absorbed energy to the curable resin. A tube characterized in that a rehabilitating material is applied to an inner wall rehabilitating portion of a pipeline to irradiate the rehabilitating material with an electromagnetic wave so that the electromagnetic wave absorbent absorbs electromagnetic wave energy, and the absorbed energy cures the curable resin. Road rehabilitation method. 2. The thermosetting resin is a thermosetting resin,
The method of claim 1, wherein the thermosetting resin is cured by heat from the electromagnetic wave absorber. 3. The method of claim 1, wherein the electromagnetic wave is infrared light or microwave. 4. The rehabilitating material is a flexible tubular member, the rehabilitating material is disposed in the conduit, and a pressure medium is sealed in the rehabilitating material in a substantially sealed state. The method for rehabilitating a pipeline according to any one of claims 1 to 3, wherein the electromagnetic wave is irradiated in a state where the rehabilitation material is pushed out from an inner surface and pressed against an inner wall of the pipeline. 5. A flexible cylindrical body containing a curable resin and an electromagnetic wave absorber for transmitting energy to the curable resin by absorbing energy by irradiating the curable resin and electromagnetic waves with or around the film or sheet. A pipe rehabilitation material characterized by being made. 6. The rehabilitating material for a pipeline according to claim 5, wherein the electromagnetic wave absorber is a metal or a metal oxide. 7. The pipe rehabilitating material according to claim 5, wherein the curable resin is a thermosetting resin.