JPH0751621A - Method for regenerating inner surface of pipe by electrostatic attraction - Google Patents

Abstract

PURPOSE:To easily an surely regenerate the inner surface of a pipeline by coating the part to be repaied by electrostatic attraction. CONSTITUTION:An aq. soln. (b) of a special material (a) to be attracted having an electrostatic positive charge is injected into a pipe 1 such as an underground pipeline to form a uniform coating of the material (a) on the inner wall of the pipe by electrostatic attraction, and the material (a) is efficiently used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for rehabilitating an inner surface of a pipe, such as a sewer pipe, which is buried underground by electrostatic attraction.

[0002]

2. Description of the Related Art Generally, as a method for repairing a leaked portion such as a crack or a crack that occurs in a pipeline such as a sewer pipe buried in the ground, regardless of the shape of the pipeline, for example, a predetermined pipe is used. An air packer is installed at the front and rear positions of the road to close the inside of the pipe, pressurize and inject the aqueous solution into this pipe, and while recirculating and circulating, the aqueous solution that has penetrated into the ground from the leak point hardens and repairs underground A method for repairing leaks in buried pipes is known. In addition, as a repair method for fine cracks (cracks), a small hole is deliberately made in the peripheral wall of the buried pipe to let grout leak through it, and even small water leak points such as fine cracks are easy, And there are some that can be repaired properly.

[0003]

However, in the prior art, the repair material is injected (backfilled) to the outside of the pipe wall, and the hardening of the material is simply intended to stop the water. It is not a repairing method that considers even reinforcement.

In view of the above-mentioned circumstances, the present invention provides a pipe inner surface rehabilitation method by electrostatic adsorption that solves the above problems by simultaneously coking and hardening the surface of the inner wall of the pipe with a special adsorbent so as to simultaneously strengthen the water. It is intended to be provided.

[0005]

According to the present invention, an aqueous solution in which a special adsorbent that can be electrostatically charged is mixed is injected into a pipe that is electrically grounded, such as a buried pipeline, and the special adsorbent is charged by static electricity. The inner wall of the tube is uniformly coated by adsorption.

Further, after the aqueous solution mixed with the special adsorbent injected into the pipe is adsorbed on the inner wall of the pipe, reinjection of the new same special adsorbent or the aqueous solution mixed with the special adsorbent having different materials is repeated. A special adsorption material may be laminated in multiple layers on the inner wall of the tube to form an adsorption coating having a predetermined thickness.

Further, the inner wall surface formed by electrostatic adsorption may be thermally cured by injecting and circulating an aqueous solution mixed with the special adsorbent injected into the tube.

[0008]

As described above, in this pipe inner surface rehabilitation method, a negatively charged underground buried pipe is charged with an aqueous solution filled in the pipe to be positively charged with static electricity. If you inject it into the tube closed with an air plug,
This positively charged special adsorbent is electrically adsorbed and coated on the inner wall of the pipe on the ground side, so that a reliable repair coating is obtained.

Further, in this case, after a certain amount of the special adsorbent is adsorbed on the inner wall of the pipe, a process of injecting a new special adsorbent or an aqueous solution containing the special adsorbent having a different material is repeated several times to form a multilayer. A coating is formed.

Further, the special adsorbent adsorbed on the inner wall of the pipe is cured by heating the aqueous solution injected into the pipe and circulating it under pressure.

[0011]

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

The drawing shows a pipe inner surface rehabilitation method for a underground buried pipeline, which is carried into the front and rear ends of a pipeline 1 to be repaired buried in the underground A through manholes 2 and 2'which are front and rear facing vertical holes. The air plugs 3 and 3'of the water stopper are fitted and set, and the air hoses 4 and 3 are led out to the outside.
Air is blown from 4'by a separate means to inflate the pipe 1
Block the upstream and downstream. In this case, the heating / injecting liquid pipe 5 is extended between the air plugs 3 and 3 ', and the both ends of the heating / injecting liquid pipe 5 are provided with an injection pipe 6 and a return pipe 7 led out to the outside. Connect the relevant injection pipe 6
And, each tip of the return pipe 7 is guided to the regeneration circulation device 8 installed on the ground. A heating boiler 9, a static electricity generating device 10, a special adsorbent mixing and pumping facility 11 are incorporated in the regeneration circulation device 8 and constitute an aqueous solution circulation passage as a whole.

Explaining this action, first, an in-pipe monitoring TV camera or the like is previously carried into the predetermined pipe line 1 and the inside of the pipe is inspected to find defective portions such as cracks in the connecting portion and the pipe wall. When regenerating the inner surface of this fixed section repair pipeline 1,
Air plugs 3 and 3'are carried in from the manholes 2 and 2'at the front and rear positions which are the upper and lower ends of the pipe 1 and are set and expanded to form a closed repair pipe 1.

Here, the special adsorbent a of the hardening resin such as thermosetting resin is electrostatically charged by the static electricity generator 10 of the regeneration circulation device 8 standing on the ground, and this special adsorbent a is next charged. Stage special adsorbent mixing and pumping facility 1
The mixed solution 1 is mixed with a predetermined aqueous solution b by 1 and is pumped from the injection pipe 6 on the downstream side to the heating / injection pipe 5 in the repair pipeline 1.
For this reason, the aqueous solution b is ejected from the ejection port 5a of the heating / injection pipe 5.
To fill the repair conduit 1 with an aqueous solution b containing the special adsorbent a.

Since the special adsorbent a mixed with the aqueous solution b is electrostatically charged positively, the special adsorbent a migrates toward the conduit 1 which becomes negatively charged on the ground side, and due to the ionic effect. The coating B is formed by adsorption on the inner wall 1a of the tube. Therefore, even if there is a water leakage site C such as a crack on the inner wall 1a of the pipe, the coating B inevitably repairs it. Of course, this wall surface coating B also reinforces the conduit itself.

In this case, the aqueous solution b is driven through the regeneration circulation device 8 until the special adsorbent a is adsorbed and formed on the pipe wall to a predetermined finished thickness, and the aqueous solution b is heated from the injection pipe 6 through the heating / injection pipe 5. Forced circulation is performed from the return pipe 7 back to the regeneration circulation device 8, and charging and special adsorbent a are added in the regeneration circulation device 8. After this (after the predetermined coating), the aqueous solution b accumulated in the conduit 1 is sucked up by the regeneration circulation device 8 and collected, or is made to flow downstream. Also,
The air plugs 3 and 3'are completed by removing and compressing the internal air.

As another embodiment of the wall surface coating, an aqueous solution b in which the predetermined special adsorbent a similar to the above is mixed is injected into the inner wall 1a of the tube to form the adsorption coating once in the tube. After that, an aqueous solution b in which the new special adsorbent a is mixed is further injected into the conduit 1, and this step is repeated several times.
Is formed.

If the aqueous solution b filled in the conduit 1 is heated and circulated under pressure, the aqueous solution b is evenly heated, so that the hardening of the special adsorbent a can be promoted.

Although the above description of the pipeline 1 has been made by burying it in the ground to make the ground negative, the pipeline 1 is not limited to the use of buried pipelines, but also bridges and piping in buildings. As described above, it is sufficient that the pipeline has a substantially negative state of static electricity.

[0020]

As described above, according to the method for constructing the inner surface of the pipe by electrostatic adsorption of the present invention, the special adsorbent is charged to a positive electrostatic charge, mixed with the aqueous solution, and injected into a predetermined pipe to be repaired. The adsorbent is electrostatically transferred to the inner wall and is automatically adsorbed, so that a reliable coating is made. In other words, if it is a underground buried pipe line that is negatively charged, it can be uniformly coated with a special adsorbent regardless of its shape and diameter, and it can also repair fine cracks on the pipe inner wall surface that do not cause water leakage. . In addition, since the special adsorbent itself adsorbs on the inner wall surface of the pipe, the charged special adsorbent is used without waste, and the material remaining in the aqueous solution can be recovered by the circulation device side. Further, since the special adsorbent itself adheres to the surface of the inner wall of the pipe, it is possible to perform multi-layer coating by repeating the process with a time lag. In this case, if the material of the special adsorbent is changed as necessary, a multi-layer coating of different materials can be performed, and a coating according to repair conditions can be obtained. Furthermore,
Although the present invention has been described for the underground buried pipe, virtually all pipes can be used as long as the pipe is electrically negative. In addition, it is difficult to coat the inner wall of an existing pipe due to rising, bending, branching, etc. of small-diameter pipes inside the building, but if the method of the present invention is adopted, any pipe can be uniformly coated as long as it can circulate an aqueous solution. It has the effect of being able to.

[Brief description of drawings]

FIG. 1 is a schematic view for carrying out a pipe inner surface rehabilitation method of the present invention.

[Explanation of symbols]

 1 Pipeline 3 Air plug 3'Air plug 5 Heating / injection pipe 6 Injection pipe 7 Return pipe 8 Recycler 9 Boiler 10 Static electricity generator 11 Special adsorbent mixing and pump facility

Claims (3)

[Claims] 1. An aqueous solution mixed with a special adsorbent that can be electrostatically charged is injected into a pipe that is electrically grounded, such as a buried pipe line, and the special adsorbent uniformly adsorbs and coats the inner wall of the pipe by static electricity. This is a method of rehabilitating the inner surface of the pipe by electrostatic attraction. 2. After the aqueous solution mixed with the special adsorbent injected into the pipe is adsorbed on the inner wall of the pipe due to static electricity, a new aqueous solution containing the special adsorbent or a special adsorbent having a different material is reinjected. The method for rehabilitating the inner surface of a pipe by electrostatic adsorption according to claim 1, wherein the special adsorption material is repeatedly laminated on the inner wall of the pipe to form a multi-layered adsorption coating. 3. The pipe inner surface rehabilitation method by electrostatic adsorption according to claim 1, wherein the inner wall surface formed by electrostatic adsorption is thermally cured by injecting and circulating an aqueous solution mixed with the special adsorbent injected into the pipe.