KR101600064B1 - Method For Repairing A Pipeline Using Liner and Moisture-Curable Foamable Resin - Google Patents

Abstract

The present invention relates to a method for repairing a pipeline using a liner and a moisture-curable foamed resin including the following steps. The method for repairing a pipeline using a moisture-curable foamed resin and a liner comprises: a step (S1) of mixing a reaction accelerator with the moisture-curable foamed resin after determining pot time; a pipeline washing step (S2) of removing scale and foreign matters by inserting a washer into the pipeline; a step (S3) of inserting a high pressure rotational spray into the pipeline; a step (S4) of coating the inside of the pipeline with the moisture-curable foamed resin using the high pressure rotational spray; a step (S5) of inserting the liner folded in a U-shape into the pipeline; a step (S6) of sealing both end parts of the liner, injecting steam under a pressure, and expanding the U-shaped liner into an O-shape; a step (S7) of cooling the liner and hardening the resin; and a step (S8) of finishing both ends of the liner. The method for repairing a pipeline according to the present invention is able to suppress the corrosion of the pipeline and secure the water flow function of the liner by not only suppressing the corrosion progress of the pipeline but also preventing damage to the liner as the pipeline and the liner are integrated in a single united body by sealing all fine pores between the pipeline and the liner by forming and infiltrating the moisture-curable foamed resin.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for repairing a pipeline using a liner and a water-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair method for repairing a pipeline using a liner and a hydraulic flexible foam resin, and more particularly, to a repair method for repairing a pipeline by filling and impregnating a pipeline between a pipe and a liner such as a hume pipe, a steel pipe,

Generally, conduits embedded at a certain depth below the ground, such as sewer pipes or water pipes, are made of concrete or metallic material in the shape of a circular tube. As time goes by, corrosion or corrosion due to microbial action or cracking or breakage .

FIG. 1 is a photograph showing corrosion inside the metal conduit, and FIG. 2 is a photograph showing corrosion and cracking in the concrete conduit. FIG. If such corrosion continues, the tube breaks and further leads to the depression of the tube, as shown in Figures 3 and 4. As a result, the water in the conduit leaks to the outside through the crack and the damaged portion, or the contaminated or unknown water flows into the conduit from the outside.

As a method of repairing cracked or broken buried conduit, there is a method of repairing or replacing the crack or damaged pipe by directly excavating it by using an excavator or the like, but the method of direct excavation requires a lot of construction cost and construction period , The risk of safety accidents and long-term traffic congestion, which detract from the aesthetics of the surroundings, and the construction cost is excessive.

In Korean Patent No. 10-0606188 ("Non-excavated PE lining rehabilitation method of old water pipe"), it is not necessary to replace the entire aged pipe buried in the ground with an excavation type, and the reinforced pipe made of synthetic resin (Liner) as a method of inserting water is a maintenance method that is intended only for passing water.

In addition, Korean Patent No. 10-1206997 ("Pipe Rehabilitation < / RTI > Method) discloses a non-rigid construction method in which a polyethylene flexible tube impregnated with a woven fabric or a thermosetting resin is inserted and heat is applied to the flexible tube, Describes a method of repairing a conduit that improves water flow by forming a tube that acts as a conduit. This patent is also a maintenance method for the purpose of passing water only.

According to this non-digging type pipe repairing method, the high-temperature and high-pressure steam is supplied to the inside of the reinforcing tube to make the reinforcing tube closely contact with the inner circumferential surface of the conduit. However, The method of inserting the reinforcing tube (liner) in the inside improves the water flow by smoothly transporting the water in the pipeline, and does not delay or prevent the damage of the old pipeline.

In addition, spaces and minute voids are inevitably present between the inner wall of the channel and the outer wall of the liner, which are repaired by the conduit repair method. Such spaces and fine voids lead to corrosion and cracking of the channel, As the crack progresses, it leads to depression and breakage, which damages not only the damage caused by the damage of the pipe itself but also the liner, so that the intrusion water, for example, groundwater or unknown water penetrates into the liner through the damaged part.

In addition, when the liner is inserted into the existing pipeline only for passing water as in the above-mentioned conventional patent, the pipeline and the liner are not integrated. Therefore, in a seasons where four seasons are clear as in Korea, due to the difference in temperature between summer and winter, pipelines and liners with different heat expansion and contraction rates repeatedly expand and shrink, resulting in pores between the pipelines and liner, .

Typically, water is fed to the water line at a high pressure of 6 to 14 kg / cm2. As such high pressure water is passed through the wall of the liner with impact, the liner can be moved out of the channel or a fine void can be formed by the impact.

Therefore, in order to prevent damage to the pipeline, it is most important to prevent or suppress the corrosion of the inner wall of the pipeline.

As a result of repeated researches to solve such problems, the present inventors have found that if fine cavities existing between the inner wall of the channel and the outer wall of the liner are penetrated and foamed with the hydraulically curable resin so that the channel is not broken or recessed, And the liner are tightly sealed to integrate the pipeline and the liner so that oxidation or corrosion of the pipeline by the microorganisms can be greatly delayed or prevented, and the present invention has been accomplished.

Accordingly, it is an object of the present invention to provide a repair method of pipelines which can significantly retard or prevent corrosion of pipelines by integrating pipelines and liners by infiltrating and foaming fine cavities or cracks between existing pipelines and liner with hydro- There is.

An object of the present invention is attained by providing a repair method of a pipe line using a foaming resin comprising the steps of:
(S1) mixing the reaction promoter with a water-vulcanizable foam resin of a polyurethane resin material after the determination of the pot life;
(S2) a pipeline cleaning step of drawing a scrubber into the pipeline to remove scale and foreign matter;
(S3) drawing a high-pressure rotary injector into the duct;
(S4) a step of applying a water-vaporable foaming resin to the inside of the pipe by a high-pressure rotary injector:
(S5) inserting a "U" -shaped liner into the channel;
(S6) closing both ends of the liner and injecting steam under pressure to expand the "U"
(S7) cooling the liner and hardening the resin; And
(S8) includes a finishing step at both ends of the liner,
Wherein the pot life includes a time required for inserting the liner into the pipeline and a time required to expand the U "-shaped liner into the""shape in the pipeline, And is mixed and controlled in the foaming resin,
The coating amount of the water-vaporable foaming resin applied in the channel is 800 g to 1,000 g per 1 m 2 of the coating area,
The viscosity of the hydroscopic foaming resin is 500 to 1,000 cps,
A lattice-shaped groove (scratch) was formed on the outer peripheral surface of the liner to a depth of 1 mm,
The reaction promoter is selected from one or more selected from 2,2-dimorpholinediethyl ether, triethylenediamine and dibutyltin dilaurate,

Wherein the internal temperature of the liner is 70 to 100 DEG C by the steam so as to promote the foaming and curing reaction of the hydrolyzable foaming resin. Provide the construction method.

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In still another embodiment of the present invention, there is provided a repair method of a pipe line in which a reaction promoter is added in an amount of 0.03 part by weight to 0.05 part by weight based on 100 parts by weight of a foaming resin so that the foaming resin is cured after 2 to 4 hours at room temperature .

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The maintenance method of the pipeline according to the present invention integrates the pipeline and the liner by sealing all the fine pores between the pipeline and the liner with a water-vaporable foaming resin to seal the pipeline, thereby suppressing the corrosion progress of the pipeline, Thereby ensuring the suppression of the corrosion of the pipeline and the function of passing the liner.

1 is a photograph showing a state in which the inside of the metal conduit is corroded.
FIG. 2 is a photograph showing corrosion and cracking in the concrete conduit. FIG.
FIGS. 3 and 4 are photographs showing a state in which the corrosion of the concrete conduit continues and the conduit is broken or depressed.
FIG. 5 is a view showing a process of a repair method with a state in which a water-hardenable foam resin infiltrates micropores according to the present invention and is sealed.

The repair method of the pipeline according to the present invention includes the following steps:

(S1) mixing the reaction promoter with the hydrocracking foam resin after determining the pot life;

(S2) a pipeline cleaning step of drawing a scrubber into the pipeline to remove scale and foreign matter;

(S3) drawing a high-pressure rotary injector into the duct;

(S4) a step of applying a water-vaporable foaming resin to the inside of the pipe by a high-pressure rotary injector:

(S5) inserting a "U" -shaped liner into the channel;

(S6) closing both ends of the liner and injecting steam under pressure to expand the "U"

(S7) cooling the liner and hardening the resin; And

(S8) Finishing step on both ends of the liner.

Hereinafter, the present invention will be described in more detail with reference to FIG.

In relation to the step (S1), in order to shorten the repair time, the application time is firstly determined, and then a coating agent is prepared in advance by mixing the reaction promoter with the hydrocycling foam resin. The term " pot life "means that a polyethylene tube having a liner or woven fabric or a non-woven fabric impregnated with a thermosetting resin is folded into a U-shape (S5), and both ends of the liner are sealed, "It means the time taken to expand to the shape (S6). The pot life may be adjusted by adjusting the amount of the reaction promoter depending on the diameter and length of the pipeline to be repaired and the type of the pipeline. For example, when repairing concrete conduits with a diameter of 400 mm and a length of 50 m, it is necessary to adjust the foaming resin to cure after 2 to 4 hours.

In step S2, scale and foreign matter are removed by cleaning the channel to be repaired with a high-pressure scrubber equipped with a scraper. When the pipeline is large (more than 700 mm in diameter), the operator directly enters the pipeline and applies the hydraulic flexible foaming resin to the high-pressure rotary injector. When the pipeline is small (less than 700 mm in diameter), it is applied by a small- do.

Then, a high-pressure rotary injector capable of uniformly injecting the inside of the pipe by rotating the nozzle is introduced into the pipe (S3).

In the step (S4), the hydraulic flexible foaming resin should be uniformly applied to the inside of the pipe with the high-pressure rotary injector. The foaming resin used in the present invention is a water-curable resin. Hydrophilic foaming resin is a polyurethane resin which is cured and foamed by reacting with moisture. In order to uniformly apply the water-vulcanizable foamable resin according to the present invention, the viscosity of the resin is preferably 500 to 1,000 cps at room temperature. When the viscosity is less than 500 cps, the foaming resin of the present invention becomes bulky below the inner wall of the conduit, making it difficult to uniformly foam and adhere in the conduit. If the viscosity exceeds 1,000 cps, uniform foam adhesion in the conduit becomes difficult.

As shown in step S7 of Fig. 5, the hydro-hardening polyurethane foaming resin (2) according to the present invention has excellent adhesiveness in addition to foamability, so that it infiltrates the damaged area of piping (1) So that the pipeline and the liner 3 can be integrated. As a result, since there is no gap between the inner wall of the channel and the outer wall of the liner, corrosion of the inner wall of the channel can be suppressed or prevented.

According to the present invention, it is preferable that the application amount of the water-vaporable foaming resin applied in the channel is in a range of 800 g to 1,000 g per 1 m 2 of the application area. When the hydrocracking foam resin is applied at the above ratio, the thickness of the foamed and cured resin is about 1 mm, which is foamed 4 to 5 times in an open environment and 1 to 2 times in a closed space. All of the fine voids are filled and hardened by the foaming force, so that all the voids are completely sealed, so that oxidation or microbial corrosion of the pipe can be suppressed or prevented.

If the coating amount of the water-softening foaming resin is less than 800 g per 1 m 2, the foaming power is weak and it is insufficient to penetrate all the pores. When the amount exceeds 1,000 g, the structure between the pipeline and the liner can not be densified, And a problem occurs in the integration of the liner.

Examples of the reaction accelerator that can be used in the present invention include 2,2-dimorpholine diethyl ether, triethylenediamine or dibutyltin dilaurate, and one or more of them can be selected and used. The amount of the reaction promoter to be used is preferably from 0.03 parts by weight to 0.05 parts by weight based on 100 parts by weight of the water-elastic foamable resin when the foam is cured after 2 to 4 hours from the application of the foam resin at room temperature. However, if necessary, for example, when the operation of inserting and spreading the liner takes less time or more, the amount of the reaction promoter can be used in an increasing or decreasing manner.

In addition, the amount of the reaction promoting agent to be used in the present invention can be controlled by controlling the amount of the reaction accelerator, so that the foaming and curing reaction is accelerated after a certain period of time and the temperature in the subsequent pressing and heating step (S6) Reactivity is further promoted at 70 to 100 < 0 > C.

In the step (S5), the step of inserting the liner folded in the "U" shape into the channel can be easily inserted into the channel by heating and softening the liner in the cured state. The liner used in the present invention is made of a high-density polyethylene resin. Since the outer circumferential surface is smooth, a lattice-shaped groove (scratch) is formed at a depth of about 1 mm on the outer peripheral surface of the liner in order to strengthen the adhesion between the inner wall of the channel and the outer wall of the liner .

In the present invention, a polyethylene tube (felt) liner in which a woven fabric or a nonwoven fabric is impregnated with a thermosetting resin may be used in place of the high-density polyethylene resin liner folded into a U-shape.

In step S6, both ends of the liner are closed and steam of 110 to 130 DEG C is injected under a pressure of 1 kg / cm < 2 > to expand the " U " At this time, the temperature inside the liner is 70 to 100 DEG C, so that the foaming and curing reaction is promoted as described above, so that the fine pores between the outer circumferential surface of the liner and the inner circumferential surface of the conduit disappear, thereby suppressing or preventing the corrosion of the conduit.

In the step S7, as described above, the integrated liner and the heated steam are exhausted from the pipe and the air is injected again to harden and fix the liner by cooling the liner.

Finally, at step S8, both ends of the liner are closed to allow connection with another liner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

1: Internal duct of existing pipe
2: foaming resin
3: Liner

Claims (9)

(S1) mixing the reaction promoter with a water-vulcanizable foam resin of a polyurethane resin material after the determination of the pot life;
(S2) a pipeline cleaning step of drawing a scrubber into the pipeline to remove scale and foreign matter;
(S3) drawing a high-pressure rotary injector into the duct;
(S4) a step of applying a water-vaporable foaming resin to the inside of the pipe by a high-pressure rotary injector:
(S5) inserting a "U" -shaped liner into the channel;
(S6) closing both ends of the liner and injecting steam under pressure to expand the "U"
(S7) cooling the liner and hardening the resin; And
(S8) includes a finishing step at both ends of the liner,
Wherein the pot life includes a time required for inserting the liner into the pipeline and a time required to expand the U "-shaped liner into the""shape in the pipeline, And is mixed and controlled in the foaming resin,
The coating amount of the water-vaporable foaming resin applied in the channel is 800 g to 1,000 g per 1 m 2 of the coating area,
The viscosity of the hydroscopic foaming resin is 500 to 1,000 cps,
A lattice-shaped groove (scratch) was formed on the outer peripheral surface of the liner to a depth of 1 mm,
The reaction promoter is selected from one or more selected from 2,2-dimorpholinediethyl ether, triethylenediamine and dibutyltin dilaurate,
Wherein the internal temperature of the liner is 70 to 100 DEG C by the steam so as to promote the foaming and curing reaction of the hydrolyzable foaming resin. Method. delete delete delete delete delete delete delete delete

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