JP2002036362A - Method for repairing underground pipe and repairing material used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repairing method capable of shortly setting a curing time even in such a case that the lowering of temperature is estimated by a crack or the like, and a repairing material used therein. SOLUTION: A flexible cylindrical repairing material (liner hose) 11A is arranged in an underground pipe 10 to be repaired and cured by heat while pressed to the inner wall of the underground pipe 10 to repair the inner wall of the underground pipe 10. In this repairing method, a heat insulating means 12 is interposed between the repairing material 11A and the underground pipe 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair method for repairing an underground pipe such as a drainage pipe by pressing a repair material against the inner surface of the underground pipe and a repair material used therefor.

[0002]

2. Description of the Related Art In repairing underground pipes such as drainage pipes, a repairing method has been conventionally performed in which the repairing material is heated and hardened while the repairing material is pressed and held on the inner surface of the underground pipe.
For example, by placing a flexible tubular repair material in an underground pipe in a folded state, and introducing a pressurized fluid into the tubular repair material, the repair material can be expanded into a cylindrical shape and outward. 2. Description of the Related Art A method of repairing an underground pipe in which a repair material is heated while being pressed against an inner surface side of the underground pipe to harden a thermosetting resin is performed.

According to this repair method, the tubular repair material is expanded, pressed along the inner surface of the underground pipe and hardened in a tubular shape, and the repair material forms a self-standing pipe. This is called a liner because it covers the underground pipe when viewed from the inside.

In such a repairing method, a repairing material having a layer of a fibrous material impregnated with a thermosetting resin is used as the repairing material on the outer peripheral side of the flexible film or sheet or between the film or sheet. As the thermosetting resin, thermosetting unsaturated polyester or epoxy resin is used in consideration of durability and mechanical strength.
Here, in order to complete the curing of these thermosetting resins, it is desirable to maintain the temperature as high as possible for a long time.

Here, the method of circulating hot water at about 80 ° C. as a heating means is to form a tubular liner extending several tens of meters in the longitudinal direction so that the entire repair material is uniformly and
Since it has advantages such as safe heating, it is adopted as a practical method. The predetermined time required to complete the curing of the thermosetting resin is set in consideration of the type and amount of the thermosetting resin to be filled therein by setting the temperature.

[0006]

However, in actual repair of an underground pipe, the condition of the outer periphery of the underground pipe may vary depending on the repaired portion. For example, when using a repair material that extends for a length of several tens of meters in the longitudinal direction, the condition of the outer periphery of the underground pipe may differ depending on the position of the underground pipe in the longitudinal direction. Further, when repairing a cracked underground pipe, the temperature of the underground pipe near the cracked location may decrease due to rainwater flooding the cracked location or the like.
In particular, the inflow of rainwater is not always constant, and is accompanied by instability.

On the other hand, in order to maintain the strength of the liner as a self-supporting tube and to maintain the mechanical strength of the liner at a predetermined level or more, the distribution of a thermosetting resin filled therein and a fibrous material for reinforcing the same is required. It is necessary to keep the thermosetting resin uniform, but it is important for quality control that the thermosetting resin is completely cured throughout.

Therefore, in the actual repairing process, in any case, it is necessary to set a curing time sufficient to complete the curing of the repairing material at all locations. For this reason, a hardening time required for heat hardening is set on the basis of a portion where the temperature may be lowered due to a crack or the like, and this hardening time requires several hours or more in normal repair.
Here, the ratio of the curing time to the entire repair work is high. Therefore, it is desired to shorten the setting time required for curing.

In order to shorten such curing time,
It is conceivable to increase the heating temperature, thereby accelerating the curing of the thermosetting resin. However, in consideration of safety and thermal efficiency, it is not advisable to raise the temperature of hot water indiscriminately.

Accordingly, an object of the present invention is to provide a repair method capable of setting a short curing time even when the temperature is expected to decrease due to cracks and the like, and a repair material used therefor.

[0011]

In order to achieve this object, according to the first aspect of the present invention, a flexible tubular repair material is provided on an underground pipe to be repaired, and the repair material is provided. A method of repairing an underground pipe by pressing the inner wall of the underground pipe with heat while curing the repair material by heat, wherein a heat insulating means is provided between the repair material and the inner wall of the underground pipe. This is a method for repairing underground pipes, wherein the repair is carried out with an intervening hole.

According to this structure, the layer containing the thermosetting resin is insulated from the underground pipe by the heat insulating means provided along the outer periphery of the cylindrical body. Can be cured without being affected by external temperature. Thereby, it is possible to cure in the same curing time as the other parts even in the place where the underground pipe has a crack, and the liner obtained in this way is entirely mechanically including the longitudinal direction of the pipeline. The strength is also uniform, and the performance as a self-standing tube is improved.

[0013] Further, since the curing time can be shortened, the energy required for the curing can be reduced in addition to the shortening of the working time by the curing.

The heat insulating means may be formed of a heat insulating material integrated with the repair material, or may be formed of a heat insulating material separate from the repair material.

For example, the repairing material includes a layer containing a thermosetting resin on or around the film or sheet, and is composed of a flexible cylinder, and a heat insulating material is formed along the periphery of the cylinder. A repair material provided with a layer can be used.

[0016]

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

First, FIGS. 1 and 2 are views for explaining a cross section of a piping structure in which a liner is provided in a sewer pipe 10 based on an embodiment according to the present invention.

In this figure, reference numeral 10 denotes an underground pipe such as a sewer pipe buried underground. This underground pipe 10
Is an existing one, in which a coated tubular body (liner) 11 as a self-standing pipe is formed via a heat insulating material layer 12, and a pipe 2 through which sewage passes is formed inside. Reference numeral 15 indicates a crack formed in the underground pipe 10.

Here, the liner 11 of the present invention is used.
Disposes a flexible tubular repair material on the underground pipe 10 to be repaired, presses the repair material against the inner wall of the underground pipe 10, hardens the repair material by heat, and heats the inner wall of the underground pipe. The underground pipe 10 is arranged, for example, by folding it flat, and the pressing is performed by expanding the repair material into a tubular shape.

As such a repair material, a material provided with a layer of a fibrous material impregnated with a thermosetting resin is used on the outer peripheral side of a flexible film or sheet or between the films or sheets. This repair material is not yet cured of the liner 11, and is hereinafter referred to as a liner hose 11A.

In the present invention, the underground pipe 10 is
It is free regardless of the pipe type, pipe diameter, pipe shape, etc. For example,
They are fume pipes, pottery pipes, steel pipes, etc.
The shape is not limited to the illustrated circular tube, but may be an oval shape or a rectangular shape.

Such a liner 11 is obtained by, for example, an all-liner method managed by the All Liner Association (a method of repairing an old sewage pipe buried underground).
Has a bending strength of 20 N / mm ² or more and a flexural modulus of 3
000 N / mm ² or more.

According to this repair method, the tubular repair material is expanded, pressed along the inner surface of the underground pipe, and hardened in a tubular shape, and the repair material forms a self-standing pipe. This coat is called a liner 11 because it covers the underground pipe 10 when viewed from the inside.

Here, the liner 11 of the first embodiment
Is the base hose 13 and the calibration hose 14
It is roughly composed of

The base hose 13 comprises an outer layer impermeable film (or sheet) 131 and an outer layer resin impregnated felt 132 impregnated with a curable resin, and the calibration hose 14 comprises an inner layer impermeable film (or sheet). (Sheet) 141 and an inner resin absorption felt 142 impregnated with a curable resin, and each of the curable resins is cured.

The outer layer impermeable film 131 is impervious so that the uncured curable resin inside can be prevented from being transmitted or scattered by evaporation or the like, and is inexpensive in consideration of durability. Material can be selected. Specifically, for example, polyolefins such as polyethylene and polypropylene are exemplified.

Similarly, the inner layer impermeable film 141 is impermeable so that the uncured resin inside can be prevented from being transmitted or evaporated by evaporation or the like. Also,
Since the inner layer impermeable film forms the inner surface of the liner 11, the film is selected in consideration of the smoothness, scratch resistance, durability, and the like of the finished inner surface. For example, polyurethane or the like is used. Thereby, it is also used as a sewer pipe in which a large amount of rainwater flows.

The curable resin is appropriately selected in consideration of the durability and mechanical properties of the liner. For example, a liquid epoxy resin or an unsaturated polyester resin is exemplified, but not limited thereto, various curable resins can be used.

These curable resins are used after being impregnated with felt made of organic fibers such as polyester, nylon, acrylic, vinylon, and carbon fibers. Of course, the type of fibrous base material such as felt is not limited to this.For example, when it is desired to increase mechanical strength, not only organic fibers, but also inorganic fibers such as glass fibers are used. The fibrous base material may be a knitted or woven fabric, a nonwoven fabric, a web, a mat such as a mat, or a laminate thereof. The liner is reinforced by a fibrous base material to increase mechanical strength such as bending strength and bending elasticity. This allows the liner to function as a freestanding tube and is stable for a long period of time.

Here, the outer resin impregnated felt 132
Is selected according to the desired strength for maintaining the strength of the liner 11 as a self-standing tube.

Further, by including a glass fiber layer in the fibrous base material, the cured liner 11 has a bending strength of 1%.
00N / mm ² or more, a flexural modulus 5000N / mm ² or more,
By setting the tensile strength to 50 N / mm ² or more, the mechanical strength of the liner 11 is further increased, and the liner 11 can be applied to a remodeling method of the underground pipe 10, thereby being buried underground such as a road. It can be used effectively even when renovating and repairing old sewer pipes.

Next, the heat insulating material layer 12 is provided to suppress the heat transfer from the underground pipe 10 to the uncured liner hose (repair material) 11A. Any material may be selected as long as it does not adversely affect the repair of the vehicle.

For example, plastic foams such as porous films and sponge-like films, calcium silicate moldings, fibrous materials such as glass wool and rock wool, other vacuum heat insulating materials, and tubular materials such as air-containing films are exemplified. Is done. By providing the heat-insulating material layer 12, even if there is a temperature change in the outer periphery (underground) of the underground pipe 10, the heat-insulating material layer 12 does not change the conditions under which the liner hose 11A is cured by heat. .

These heat insulating layers 12 are preferably impermeable to water. If the underground pipe 10 to be repaired has cracks 15 if it is impermeable, and there is a possibility that rainwater may enter the underground pipe from the crack 15 during the repair work,
This impermeable insulation layer 12 blocks rainwater.
Thereby, the immersion does not directly contact the liner hose 11A, and the curing failure does not occur.

Further, the heat insulating material layer 12 may include an aluminum foil or a composite of other reflective and radiating materials, so that heat is blocked by both heat transfer and radiation. The main purpose of the heat insulating material layer 12 is to suppress cooling from the outside, but the heat insulating material layer 12 can also serve to keep the temperature of the liner hose 11A heated for curing. Thereby, when the thickness of the liner hose 11A is large,
The required energy can be dramatically reduced along with the time required for curing.

The heat insulating material layer 12 is a tubular heat insulating hose (tube) 12A provided with the heat insulating material layer 12 on the outer periphery of the liner hose 11A when the liner hose 11A is manufactured.
(Refer to FIG. 3).
The heat insulating material layer 12 may be integrally formed on the outer surface of the liner hose 11A during the production of the liner hose 11A. Further, the inside of the pipe 2 may be covered with a heat insulating material in advance, or a heat insulating hose 12A forming the heat insulating material layer 12 is disposed in the pipe 2, and the liner hose 11A is drawn into the heat insulating hose 12A. It may be provided between the underground pipe 10 and the liner 11.

Next, an example of the repair work according to the present invention will be described with reference to FIG. Here, S1 to S5 are the liner hoses in the factory (the state before the liner 11 is cured) 1
1A shows a preparation process, and S11 to S21 show a construction process on site.

First, in S1, an appropriate material suitable for the purpose is prepared. As the material, the material of the base hose base material 13A and the calibration hose base material 14A and the heat insulating hose 12A are selected according to the diameter, shape and length of the sewer pipe at the construction site, and cut into appropriate lengths.

Here, as the insulating hose 12A, for example, a synthetic resin foam film such as a urethane foam having a tubular closed cell shape can be used.

The base hose base material 13A is a material before the base hose 13 is impregnated with the curable resin, and includes a tubular impermeable film (or sheet) and a felt laminated inside. The calibration hose base material 14A is a material before the curable resin is impregnated into the calibration hose 14, and has a tubular impermeable film (or sheet) and a felt laminated inside the film. It is composed of

Next, in S2, the curable resin to be impregnated is mixed and adjusted, and this curable resin is impregnated in each felt layer of the base hose base material 13A and the calibration hose base material 14A in S3. When the base hose base material 13A is sufficiently impregnated with the curable resin, the impregnation of the calibration hose base material 14A may be omitted.

In S4, the inside and outside of the calibration hose base material 14A are reversed, and the base hose base material 13A
And an insulating hose 12A is put on the outside. Thereby, this liner hose 11A is
Calibration hose 1 inside base hose 13
4 is an outer resin-impregnated felt 13 impregnated with a curable resin
2 and inner layer resin absorbing felt 14 impregnated with curable resin
2 is directly contacted, an outer layer impermeable film (or sheet) 131 is disposed on the outer layer of the tube, and an inner layer impermeable film (or sheet) 141 is laminated on the inner layer of the tube. And a heat-insulating hose 12A
Is a laminated body covered in layers over the entire circumference and the entire length.

Thus, the impermeable film (or sheet) is laminated on the inner and outer layers of the cylindrical body, thereby preventing the resin inside from leaking out of the cylindrical body.

The liner hose 11A is folded at a construction site in a state where the tubular body is folded flat and wound up or folded for ease of transportation and construction, and is kept at a low temperature by a cold storage vehicle. Conveyed.

On the other hand, at the construction site, the preparation for the construction of the all-liner method is started in S11, and in S12, the inside of the pipe line 2 is cleaned and an inspection by a television camera is performed, and it is confirmed whether or not there is any part that is not suitable for repair. Then, in S14, the heat insulating hose 12A is provided.

Next, a liner hose 11A whose periphery is covered by a heat insulating hose 12A is conveyed from the insulated car, drawn into the pipeline 2 by a winch or the like, jigs (not shown) are attached to both ends, and hot water is used as a heating fluid. A heating hose through which the water is circulated is connected.

Here, since the liner hose 11A is folded, it can be easily disposed in the pipeline 2. The folded state is usually a state in which the cylindrical body is simply crushed and flattened, but may be a three-folded or multi-folded state. It is sufficient that the liner hose 11A is guided into the conduit 2, and the liner hose 11A may be introduced into the manhole in a partially expanded state, and the form is not limited.

Next, the folded liner hose 11
A liner hose 11A is expanded by applying pressure, such as water pressure, by a pressure unit to the inside of A, and while circulating hot water,
Heating is performed while circulating hot water of 80 ° C. by a boiler or the like to cure the impregnated resin. Here, the heating holding time required for curing is as follows. The heating holding time of the conventional liner 11 considering safety is 1 hour for every 3 mm in thickness, that is, 15 mm.
Under the condition that the liner 11 is about 5 hours, the heating holding time can be reduced by almost half.

As a result, the liner hose 11A expands in the radial direction of the pipeline 2 and is hardened in a pressed state with the heat-insulating hose 12A interposed on the inner peripheral surface of the underground pipe 10, and is formed into a pipe shape as a self-standing pipe. Is formed. At this time, there is a crack 15 or the like in the underground pipe 10, and even if rainwater or the like intrudes from the crack 15, this rainwater is blocked by the heat insulating hose 12A and does not reach the liner hose 11A. It is cured uniformly throughout.

In accordance with S17 to S21, after the hot water is cooled and drained, the pipe opening is finished, and if there is a branch, etc.,
At S19, the branch pipe is mounted by piercing the mounting pipe. A final check is made in S20 and the order is 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 surface of the pipeline 2, and a portion of the pipeline 2 where the crack 15 exists is provided. Can also be repaired.

It should be noted, by the liner 11 is reinforced by glass fibers, bending strength 100 N / mm ² or more, the flexural modulus 5000N / mm ² or more, a tensile strength of 50 N / mm ² or more, the With such a configuration, the liner 11 has a high mechanical strength, so that the underground pipe 10 can also be reconstructed. Thereby, it can be effectively used even when renovating and repairing an old sewage pipe buried under the road.

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 can 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 hose 11A is composed of four layers of a two-layer calibration hose and a two-layer base hose. For example, the liner hose 11A has a tubular shape whose outer surface is covered with a highly airtight plastic film. The cloth may have a three-layer structure in which a curable resin is impregnated, or may have a multilayer structure of five or more layers.

The heat required for curing (thermosetting means) circulates warm water. However, the present invention is not limited to this, and other heating fluid such as heated air or non-contact type heating means such as an infrared heater may be used. May be heated.

[0056]

As described above, according to the present invention, since the repair is performed by interposing the heat insulating means between the repair material and the inner wall of the underground pipe, the repair material is insulated from the underground pipe. Repair material can be cured without being affected by external temperature. As a result, even underground pipes can be cured in the same curing time as other locations even when there is a crack in the underground pipe. By using this, it is possible to provide a repair method capable of setting the curing time to be short and a repair material used therefor.

[Brief description of the drawings]

FIG. 1 is a partial perspective view illustrating a piping structure according to a first embodiment of the present invention.

FIG. 2 is a partial sectional view of the piping structure of FIG.

FIG. 3 is a perspective view illustrating a heat insulating hose used in the piping structure of FIG. 1;

FIG. 4 is a process diagram illustrating a process of applying the piping structure of FIG. 1;

[Explanation of symbols]

2 Pipeline 10 Underground Pipe 11 Liner (Hardened Coating Cylinder) 11A Liner Hose (Flexible Coating Cylinder, Repair Material) 12 Heat Insulation Layer 12A Heat Insulation Hose 13 Base Hose 14 Calibration Hose

Continued on the front page F term (reference) 3H025 EA01 EB25 EC06 ED02 4F211 AA36 AD07 AD12 AD17 AD20 AG03 AG08 AG20 SA13 SC03 SD04 SD11 SD15 SN11 SP12 SP21

Claims (4)

[Claims] A flexible tubular repair material is disposed on an underground pipe to be repaired, and the repair material is cured by heat while pressing the repair material against the inner wall of the underground pipe. An underground pipe repair method for repairing an inner wall of an underground pipe, wherein the repair is performed by interposing a heat insulating means between the repair material and the inner wall of the underground pipe. 2. The underground pipe repair method according to claim 1, wherein said heat insulating means is formed of a heat insulating material integrated with said repair material. 3. The method for repairing an underground pipe according to claim 1, wherein said heat insulating means is formed of a heat insulating material separate from said repair material. 4. A flexible tubular body having a layer containing a thermosetting resin between or around the film or sheet,
A repair material for an underground pipe, wherein a layer of a heat insulating material is provided along an outer periphery of the cylindrical body.