JP4245860B2 - Pipe repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention repairs a pipe line such as a drain pipe buried in the ground by pressing a repair material containing a thermosetting resin from the inner surface side to cure the thermosetting resin. Regarding the method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a pipe line repairing method in which a repair material containing a thermosetting resin is pressed from the inner surface of the pipe line and cured is widely known. According to such a pipe line repair method, it is possible to repair the pipe line such as a drain pipe buried in the ground from the inner surface side without digging back.
[0003]
When there is a branch pipe branched from the main pipe by such a pipe line repair method, the main pipe pipe is repaired across the branch portion with the branch pipe. When repairing a conduit traverses such bifurcation repairing material containing a tubular thermosetting resin is introduced across the bifurcation of the pipe, the branch portion therein mains A new tubular rehabilitation line is formed across . Next, in this rehabilitation pipe, a branch portion is drilled to connect the main pipe and the branch pipe.
[0004]
[Problems to be solved by the invention]
However, if the conventional pipe repair method is used, the thickness of the repair material at the bifurcation may increase, and a rehabilitation pipe (repair) is required to connect the main pipe and the branch pipe after repair. When trying to perforate the bifurcated portion of the material, the thickness of the repair material is so thick that much labor is required for perforation.
[0005]
This invention has been made based on this background, to provide a method of repairing a pipe capable of reducing the labor time of drilling the branch portion when repairing a pipeline across the bifurcation Objective.
[0006]
[Means for Solving the Problems]
As a result of intensive studies conducted by the present inventors in order to achieve this object, it was found that this thickness phenomenon was caused by a decrease in temperature of the repair material due to water leakage at the bifurcation, and hardening of the bifurcation was performed. It has been found that the occurrence of this thickness phenomenon can be eliminated if it is accelerated compared to the curing of other parts.
[0007]
In addition, since this branch part is connected to the outside by a branch pipe, auxiliary heating from the outside is possible, and if the repair material of the branch part is positively heated from the outside, the repair material at the branch part can be cured. It has been found that the delay is eliminated and in some cases hardening is accelerated compared to the other parts, thereby reducing the occurrence of thick parts and possibly eliminating the thick parts.
[0008]
That is, when repairing a repair material containing a thermosetting resin across the branch pipe from the inside of the main pipe, the repair material is heated from the inside of the repair material while being pressed from the inside toward the main pipe wall. The curable resin is cured. Here, if there is water leakage in the branch pipe at the upper part of the branching part in this pressed state, the water leakage stays at the upper part of the branching part. This repair material is heated from the inside of the cylindrical repair material in order to cure the impregnated curable resin, but the branch portion is cooled from the outside by this staying water, so the branch portion (the surface of the branch pipe) The temperature of the repair material in the vicinity does not rise to a desired temperature, and the curing of the repair material at this branch portion is delayed. As a result, in the middle of the curing reaction, the repair material located at the bifurcation part is slower to cure than the other parts, and the repair material located near the bifurcation part causes plastic deformation. A thickness phenomenon occurs in which the thickness of the repair material becomes thick.
[0009]
Therefore, since this branch portion is connected to the outside by a branch pipe, auxiliary heating from the outside is possible. If the repair material in the vicinity of the branch portion is positively heated from the outside by auxiliary heating, the delay in curing of the repair material at the branch portion is eliminated, and in some cases, curing is promoted as compared with other portions. Thereby, generation | occurrence | production of a thick part is reduced or eliminated.
[0010]
Here, water leaks in the branch pipe in the vicinity of this branch, but if a heating material that reacts with the water leak and generates heat, such as heat of hydration, is administered to the branch, Efficiently generates heat and raises the temperature of water leakage. As a result, when there is water leakage, the temperature drop due to water leakage can be avoided in the vicinity of the branch part, and in some cases, the repair material near the branch part is actively heated from the outside by using the water leak as a heating medium. Thus, the delay in curing is eliminated, and in some cases, curing is accelerated compared to other parts. Thereby, generation | occurrence | production of a thick part is reduced or eliminated.
[0011]
If a heating material that generates heat by contact with the leaked water staying as such heating means, for example, calcium oxide, is introduced from the side of the branch pipe toward the repair material, the leakage of water and the heating material react and the temperature of the leakage water is increased. The temperature can be warmed, and a decrease in temperature due to water leakage, that is, a delay in the curing reaction is avoided. In addition, since calcium oxide raises the temperature of water when it comes into contact with water, it is not limited to water leakage. The repair material can be heated from outside by being heated.
[0012]
In addition, the present inventors have found that the use of heat of hydration can be used as a heating medium filled in a repair material containing a thermosetting resin.
[0013]
That is, the present invention is a method for repairing a pipe line having a branch pipe branched from a main pipe , wherein the repair material containing the thermosetting resin is pressed against the inner surface of the main pipe. This is a method for repairing a pipeline heated from the inside. Here, the heating of the repair material may be performed only from the branch pipe side, or in addition to the heating from the branch pipe side, the heating from the main pipe side may be used in combination.
[0014]
For heating from the side of the branch pipe, it is easy to use a heat generating material that generates heat when it comes into contact with water, and the heat generating material may be introduced from the branch pipe toward the repair material.
[0016]
In the present invention, calcium oxide is exemplified as a preferable material as a heat generating agent.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
[0018]
Drawing 1 is a figure explaining the situation where underground pipe 1 used as the rehabilitation object of the rehabilitation method concerning the present invention is repaired by a section. The underground pipe 1 is composed of a branch pipe (attachment pipe) 2 and a main pipe 4 that joins the branch pipe 2 at a merging portion (branching portion 3) to flow waste water. The main pipe 4 is large enough to be accessible from the ground using a working robot or the like through manholes 5 and 5. Moreover, as shown in FIG. 2, the branch pipe 2 is connected to each household etc. via the housing lot 6 etc., and is for flowing the waste_water | drain (or waste water) discharged | emitted from each household. The diameter is as small as about 100 mm.
[0019]
The underground pipe 1 that forms the main pipe 4 and the branch pipe 2 is a concrete fume pipe, a ceramic ceramic pipe, a resin PVC pipe, or the like as a unit. Moreover, not only the circular tube to show in figure, but an egg shape and a rectangle may be sufficient.
[0020]
Here, the main pipe 4 is cracked or loosened (not shown) or the like over the entire pipe line for some reason. In the present invention, the crack or loosened connecting part or the like is generated. Repair (rehabilitation) shall be repaired (rehabilitation). Similarly, the branch pipe 2 is also cracked or loosened (not shown) due to some cause. Thereby, groundwater including rainwater leaks into the branch pipe 2 due to these cracks or loosening of the connection portion (hereinafter abbreviated as “crack”).
[0021]
When the main pipe 4 is cracked, a liner 10 as a long repair material having a cylindrical shape as shown in FIG. 3 is used. The liner 10 is schematically constituted by, for example, a base hose 11 and a calibration hose 12, and the base hose 11 is an outer layer impregnated with an outer layer impermeable film (or sheet) 13 and a thermosetting resin fixed thereto. The calibration hose 12 is composed of an inner layer impermeable film (or sheet) 15 and an inner layer resin absorption felt 16 impregnated with a thermosetting resin fixed thereto.
[0022]
The outer layer impermeable film 13 is impermeable so that the thermosetting resin does not permeate or evaporate, and an appropriate material can be selected from the viewpoint of durability and cost. Specifically, for example, polyolefins such as polyethylene and polypropylene are exemplified.
[0023]
The inner layer impermeable film 15 is also impermeable so that the thermosetting resin does not permeate or evaporate, and an appropriate material is selected in consideration of the smoothness, scratch resistance, durability, etc. of the finished inner surface. For example, polyurethane, polyamide, saturated polyester and the like are used.
[0024]
In addition, the thermosetting resin is appropriately selected in consideration of the durability, mechanical properties, handleability, cost, and the like of the liner 10, and a thermosetting unsaturated polyester resin is exemplified as a typical resin.
[0025]
These thermosetting resins are used by 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 the fibrous base material such as felt is not limited thereto, and may be a fabric such as a knitted fabric, a nonwoven fabric, a web, a mat, or a laminate thereof. The liner 10 is reinforced by the fibrous base material to increase the mechanical strength such as bending strength and bending elasticity. The liner 10 is flexible in a state where it is impregnated with a thermosetting resin. For example, the cylindrical liner 10 can be stored flatly folded or rolled up.
[0026]
Such a liner 10 is adjusted as follows, for example.
[0027]
First, an appropriate material suitable for the purpose is prepared. As materials, the materials of the base hose 11 and the calibration hose 12 are selected according to the diameter, shape and length of the main pipe 4 at the construction site, cut into appropriate lengths, and each polymerization initiator to be contained is contained. The thermosetting resin contained is mixed and adjusted, and the felt layers of the base hose 11 and the calibration hose 12 are impregnated with the thermosetting resin. The inside and outside of the calibration hose 12 are reversed and inserted inside the base hose 11.
[0028]
In this liner 10, the rehabilitation material is flatly folded and wound up or folded for ease of transportation and construction, and conveyed to the construction site in a state of being stacked. Of course, the series of operations including the impregnation step of the thermosetting resin may be performed at the work site.
[0029]
The inside of the main pipe 4 to be rehabilitated is cleaned in advance and surveyed by a TV camera, and it is confirmed whether there is a part that is not suitable for repair. Next, the liner 10 is drawn into the main pipe 4 by a winch through a roll or the like from a transport vehicle (boiler vehicle) 7 loaded with the boiler 7a. Since the liner 10 is folded, it can be easily disposed in the main pipe 4. The folded state is usually a state in which the rehabilitation material is simply flattened and flattened, but it may be tri-folded, multiple-folded, or the like. It suffices if the liner 10 is guided to the main pipe 4 and may be introduced into the manhole 5 in a partially swollen state, and the form is not limited. Thus, as shown in FIG. 1, the liner 10 is disposed in the main pipe 4 to be repaired, and the front end and the front end are tightened while maintaining airtightness by the plug body 17 or the like.
[0030]
Next, water pressure is applied to the folded liner 10 by a pressurizing unit (pressure adjusting device) 8 to expand the diameter of the liner 10.
[0031]
With the diameter of the liner expanded, calcium oxide (CaO) as a heating material is introduced from the ground toward the branch portion 3 through the branch pipe 2 using the housing lot 6 (FIG. 2). If groundwater leaks into the branch pipe 2, the groundwater 9 stays in the branch 3, but when calcium oxide (CaO) comes into contact with the groundwater 9, the groundwater 9 is warmed, so that the liner 10 is not cooled from the outside. Conversely, the liner 10 is warmed from the outside to accelerate the curing of the thermosetting resin in the liner 10.
[0032]
This calcium oxide (CaO) is known as a chemical substance that generates heat by generating heat of hydration when it comes into contact with water. Many such chemical substances have been proposed. They are, for example, a type that utilizes an addition reaction of water to an oxide and a type that utilizes an addition reaction of water to an anhydrous salt.
[0033]
In the present invention, any type of heat generating material may be used, but a material having a large amount of heat generation and having few disposal problems is preferable even when discarded. From such a viewpoint, it is preferable that the heat generating material used in the present invention uses calcium oxide (quick lime: CaO).
[0034]
Calcium oxide (CaO) reacts with water to generate a heat of hydration of 15.2 Kcal per mole and 271 cal / g when converted to gram. Thereby, it reacts with water leak etc. and the temperature of water leak can be raised. The smaller the particle size of calcium oxide (quick lime) used, the better the reaction rate. In the present invention, however, the reaction rate is not so important, so the particle size may be large or small.
[0035]
The method for charging the heat generating material toward the branch portion 3 is not limited. It can be directly put into the pipe of the branch pipe 2, or can be put into the branch pipe 2 after being stored (or filled) in a bag or container such as a net, nonwoven fabric, Japanese paper, or synthetic paper that allows water to penetrate.
[0036]
Next, warm water is supplied from the boiler 7a into the liner 10, and the warm water is circulated in the liner 10 along the arrow. As a result, the curing of the curable resin is completed while the liner 10 is pressed onto the inner peripheral surface of the main pipe 4, and the liner 10 becomes a pipe-like self-supporting pipe. Thereby, even if there is a crack or the like in the main pipe 4, the crack is brought into close contact with the liner 10 and the crack is not exposed in the main pipe 4.
[0037]
Hot water as a heating medium is cooled and drained. Thereafter, the pipe opening of the main pipe 4 is finished. Moreover, since the groundwater 9 staying in the branch pipe 2 exhibits strong alkalinity, it is appropriately neutralized.
[0038]
Next, by introducing a robot type drilling machine into the main pipe 4, the liner 10 in which the branch part 3 is located is drilled to connect the branch pipe 2 and the main pipe 4. The repair material (liner 10) in the vicinity of the branch part 3 eliminates the generation of a thick part in the vicinity of the branch part 3, and can smoothly perform the drilling operation with the hole drilling machine.
[0039]
Next, a description will be given construction example using a molding hose a reference example of the present invention.
[0040]
First, as shown in FIG. 4, a molding hose 19 is prepared to which a small bag 18 such as a net containing a predetermined amount of calcium oxide serving as a heat generating material is divided. The forming hose 19 is for pressing a felt hose 20 that is a pipe-shaped resin tube body against an existing pipe from the inside. The felt hose 20 includes an impermeable film layer on the outside and a felt layer impregnated with a thermosetting resin on the inside. The felt hose 20 is constructed as a double hose drawn into the molding hose 19.
[0041]
This double hose 20 is set in a reversing device (not shown), the hose end is fixed to the reversing device, and the double hose 20 is reversed by the compressed air sent into the reversing device. Inserted into.
[0042]
Next, when water is poured into the molding hose 19, as shown in FIG. 5, the water and calcium oxide in the sachet 18 react with each other to become warm water, and the curing of the resin is promoted. After the resin is cured, the pH of water is adjusted and drained, and the molding hose 19 is removed. Thereby, hardening of the thermosetting resin in a felt hose can be easily promoted, without using heating means, such as a heater and a boiler.
[0043]
Although FIG. 5 shows the repair related to the branch pipe, it is also possible to carry out the main pipe 4 by inserting calcium oxide into the pouch 18.
[0044]
Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. However, it is included in the present invention.
[0045]
For example, the liner 10 is composed of two layers of a calibration hose and two layers of a base hose. For example, the liner 10 is a tubular fabric or fiber whose outer surface is coated with a highly airtight plastic film. A three-layer structure in which a base material is impregnated with a curable resin may be used, or a multilayer of five or more layers may be used.
[0046]
In the above embodiment, an example of repairing an existing pipe is shown. However, the present invention is not necessarily limited to this, and the method of the present invention is applied to a pipe of a new pipe that does not require repair. Also good.
[0047]
The rehabilitation of the present invention is not limited to repairing cracks, but can be rehabilitation of pipes that have not been cracked and have simply deteriorated, or a liner as a self-supporting pipe is provided on the inner surface of a new pipe for some reason. In case of rehabilitation.
[0048]
【The invention's effect】
As described above, according to the present invention, the conduit repair method that labor can be reduced when drilling a branch unit when repairing a pipeline across the bifurcation is provided.
[0049]
Moreover, according to this invention, the repair method of the pipe line which hardens a thermosetting resin using the hot water whose temperature was raised using the heat generating material which generate | occur | produces heat by contacting with water as a heating medium is provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a rehabilitation method according to the present invention .
FIG. 2 is a cross-sectional view illustrating a situation where a heating material is charged into the branch pipe 2 of FIG.
FIG. 3 is a perspective view illustrating a liner 10 used for repairing the pipeline of FIG. 1 with a partially cutaway cross section.
FIG. 4 is a diagram for explaining a situation where a small pouch of heat generating material is attached to a molding hose according to a reference example .
FIG. 5 is a cross-sectional view illustrating a rehabilitation method according to a reference example .
[Explanation of symbols]
1: Underground pipe 2: Branch pipe (mounting pipe)
3: Branch
4: Main pipe 5: Manhole 6: Residential land wall 7: Transport vehicle 7a: Boiler 8: Pressure unit 9: Groundwater 10: Liner (repair material)
11: Base hose 12: Calibration hose 13: Outer layer impermeable film (or sheet)
14: outer layer resin impregnated felt 15: inner layer impermeable film (or sheet)
16: Inner layer resin absorption felt 17: Plug 18: Small bag 19: Molding hose 20: Felt hose (double hose)

Claims (4)

A method for repairing a pipeline having a branch pipe branched from a main pipe, the pipe being heated from the inside of the repair material while pressing a repair material containing a thermosetting resin toward the inner surface of the main pipe In the repair method of
A method for repairing a pipeline, wherein the repair material is heated only from a branch pipe side. A method for repairing a pipeline having a branch pipe branched from a main pipe, the pipe being heated from the inside of the repair material while pressing a repair material containing a thermosetting resin toward the inner surface of the main pipe In the repair method of
A method of repairing a conduit, characterized in that said main pipe side and the branch pipe side or al pressurized heat the repair material. The method for repairing a pipeline according to claim 1 or 2, wherein the heating from the side of the branch pipe uses a heat generating material that generates heat by contact with water. The pipe line repair method according to claim 3, wherein the heat generating material is calcium oxide.

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