JP3160354B2 - Pipe line repair method by suction lining - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a pipe buried underground for city gas or water supply using a resin, and more particularly, to use a negative pressure for an underground buried pipe consisting of a branch pipe and a service pipe. Related to the repair method.

[0002]

2. Description of the Related Art Conventionally, a so-called resin lining method has been known, in which a two-component mixed-room-temperature-curable epoxy resin is applied to the inner surface of a pipe to form a coating film in order to repair an underground pipe. .

[0003]

However, the conventional resin lining method uses an in-pipe transporter called a pig, so that repairing a pipe of a different diameter requires labor such as exchanging the pig. It is difficult to construct the bent part of the pipeline, and the clogging of the pig due to the dent or rust of the pipeline is likely to occur,
Construction efficiency was not good.

[0004] Pigs are known to be transported by wire or by high-pressure air, but it is difficult for the pig to be inserted through a pipe. In addition, the pumping by high pressure air was apt to cause breakage of aged buried pipes and blow-through at corrosion holes.

[0005] Further, at the end of the pipe, there is a risk that a pig or a resin may be blown out to collide with an operator or to stain the work site.

According to the present invention, a negative pressure is used to transfer a resin, a pipe to be repaired is not burdened by high-pressure air, a buried pipe is not broken, and a blow-through at a corrosion hole does not occur. An object of the present invention is to provide a resin lining method that requires only a single installation of a control device, does not require time and effort for movement, does not require a pig, is easy to perform, and has low noise.

[0007]

In order to achieve the above object, the present invention provides a method in which a resin is injected into one end of a pipe buried underground, and the resin is moved by air pressure to form a resin film on the inner surface of the pipe. In the method of repairing a pipeline to be formed, one end of the pipeline is connected to a vacuum pump having a resin recovery function connected to a vacuum pump, and the other end of the pipeline is opened. After injecting resin to form a resin plug,
The resin plug is transferred by the negative pressure of the vacuum pump to form a resin film in the pipe, and the amount of injected resin is sufficient to form the resin film in the pipe within several meters at a time. It is characterized in that the operation of repeatedly injecting the same amount of resin is continuously performed every time the injected resin blows through.

Further, according to the present invention, when repairing a pipeline composed of a branch pipe and a plurality of internal pipes, only the end of the pipeline to be repaired is opened first, and a resin is injected from the opening. Is formed, the end of the other pipeline is closed, the first repair is performed by the suction lining, and then the pipeline to be repaired next is similarly repaired.

Further, according to the present invention, after repairing a branch pipe first, repairing a plurality of service pipes, supplying a leveling pig from the end of the branch pipe into the pipe, closing the end, While supplying compressed gas from the end of each service pipe, the leveling pig is moved by negative pressure from a vacuum pump to level the resin in the branch pipe.

[0010]

According to the present invention, the resin injected into the open end of the conduit is sucked and moved by the negative pressure generated by the vacuum pump connected to the other end by having the above-mentioned unique structure. Then, a resin film is formed in the pipeline. At this time, the amount of the resin to be injected is set to a constant amount enough to form a resin film in a pipe within several meters at a time, and the same work is performed every time the injected resin is consumed by the resin film and blows through. Repeatedly, a small negative pressure creates a rapid resin flow,
You can work smoothly.

An underground buried pipeline generally comprises a thick branch pipe and a plurality of thin internal pipes connected to each home branched from the branch pipe. When repairing such a pipeline, first, the branch pipe is used. It is preferable to construct the pipes in order, and then to sequentially construct a plurality of branch pipes. The reason is that when applied to a thick branch pipe, the narrow internal pipe becomes clogged with resin at the connection with the branch pipe, but the clogging is resolved by blow-by by the subsequent application to the internal pipe. is there.

Further, when a negative pressure is applied, a vacuum tank is interposed between the vacuum pump and a pipe line to which the vacuum pump is connected. In addition, the negative pressure pulsation by the vacuum pump is eliminated, a stable resin flow is obtained, and the thickness of the resin film becomes constant.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a construction state of a branch pipe 1 portion. Referring to the drawing, the construction procedure will be described. Work holes 10 are excavated at both ends of a section to be repaired of a pipeline composed of a branch pipe 1 and a service pipe 2 buried underground.

In the borehole 10, the branch pipe 1 is cut, and a resin hopper 4 is fixed to one of the cut pipes. A vacuum tank 6 is connected to the other end by a hose 8. Further, the distal end of the service pipe 2 is also cut and closed by a detachable cap 3. A vacuum pump 7 is connected to the vacuum tank 6 by a hose 9, and a negative pressure acts on the branch pipe 1 via the vacuum tank 6 by the operation of the vacuum pump 7.
The vacuum tank 6 functions as a resin receiving container for collecting excess resin, and also functions as an accumulator for storing vacuum and stabilizing negative pressure.

In the embodiment configured as described above,
First, a predetermined amount of resin is injected into the resin hopper 4 from above. The resin is preferably a two-part mixed room-temperature curing epoxy resin having a viscosity of 100,000 cps or less and a curing time of 4 hours or more.

Next, when the vacuum pump 7 is operated, a negative pressure acts on the branch pipe 1 via the vacuum tank 6. Since the inlet of the resin hopper 4 is open to the atmosphere, the resin in the resin hopper 4 is pulled by the negative pressure and advances in the branch pipe 1. Then, a so-called resin plug 11 is formed and the process proceeds, and a resin film 12 is formed on the progress of the process so that the resin lining is performed.

At this time, since the negative pressure has a very small pressure fluctuation due to the action of the vacuum tank 6 as an accumulator, the progress of the resin plug 11 becomes very stable, so that the thickness of the resin film 12 is reduced. It has a constant thickness. The amount of resin required for the resin lining of the branch pipe 1 can be easily obtained by calculation. However, it is better to work the resin plug 11 by dividing it by several meters rather than injecting the entire amount into the resin hopper 4 at once. The amount is small and flows smoothly, and the condition is good.

Next, FIG. 2 is a cross-sectional view showing a construction state of the service pipe 2 immediately after the construction of the branch pipe 1 is completed. In this state, the end of the service pipe 2 on the side of the branch pipe 1 is clogged with resin. Referring to FIG. 2, the construction procedure will be described. A resin hopper 4 is connected to the open end of the service pipe 2 to be constructed, and all other pipe ends are closed by caps 3. The same as when constructing. The resin 13 in the resin hopper 4 proceeds in the service pipe 2 to form the resin film 12 and blows into the branch pipe 1. Therefore, clogging of the distal end portion of the serving pipe 2 is resolved.

The blown resin accumulates in the branch pipe 1.
Since the branch pipe 1 has a relatively large diameter, there is practically no hindrance. However, as shown in FIG. 3, the smoothing pig 16 having a diameter equal to the inner diameter including the resin film 12 in the branch pipe 1 is moved by suction. It is desirable to carry out the work. At this time, Pig 1
In order to prevent the resin pushed by 6 from entering the service pipe 2 again, an orifice 14 is provided at each end of the service pipe 2.
The compressed gas cylinder 15 is connected via
By flowing a gas at a rate of about 1 / min, the resin does not enter the inside pipe 2.

After the above construction, if the so-called curing is performed by blowing warm air of about 40 degrees into the pipe for 1 hour to 10 hours, the resin can be cured quickly. Alternatively, the resin film 12 may be cured with time in a live tube state through which gas is passed immediately after the application, without performing this curing.

[0021]

According to the present invention, the branch pipe 1,
The service pipes 2 can be constructed in order and collectively, without damage even in aging pipes, and as in the case of using high-pressure air, spouting of earth and sand due to the damage of the pipes and accidents caused by flying gravel and debris Does not occur.

Further, even if there is a corrosive hole in the pipeline, it is buried with earth and sand, so that the construction can be performed without taking any special measures for closing the corrosive hole. In addition, since a pig is not used, construction is easy even for a bent pipe or a pipe having a large unevenness on the inner surface of the pipe, and excess resin can be easily collected. Do not break down.

Further, the clogging of the resin in the service pipe 2 at the portion where the service pipe 2 is connected to the branch pipe 1 is removed in accordance with the work procedure, so that the work is facilitated. Vacuum pump 7
The pressure difference between the negative pressure and the atmospheric pressure is about 0.3 to 0.9 atm and cannot be higher than that, and it is extremely stable. In addition to being safe, no control device for pressure adjustment is required, and noise is smaller than when a compressor is used.
Also, during the construction, power sources and control devices such as the vacuum pump 7 and the vacuum tank 6 do not need to be moved at all, so that less labor is required.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view when a branch pipe 1 is constructed.

FIG. 2 is a cross-sectional view of the internal pipe 2 during construction.

FIG. 3 is a cross-sectional view of the branch pipe 1 during a break-in operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch pipe 2 Serving pipe 4 Resin hopper 6 Vacuum tank 7 Vacuum pump 11 Resin plug 12 Resin film 14 Orifice 15 Compressed gas cylinder 16 Normalization pig

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B05D 7/22 F16L 55/16

Claims (3)

(57) [Claims] In a method of repairing a pipeline in which a resin is injected into one end of a pipeline buried underground and a resin film is formed on the inner surface of the pipeline by moving the resin by air pressure, a vacuum is applied to one end of the pipeline. Connected to pump to recover resin
Connect the vacuum tank with, and opens the other end of the conduit, the open ends from the resin injected into mixture was allowed to form a resin plug, the resin plug is transferred by the negative pressure by the vacuum pump To form a resin film in the pipeline ,
At a time, the amount of resin to enter into a pipe within several meters
Insufficient amount of resin to form a grease film
Injecting the same amount of resin repeatedly every time
A method of repairing pipelines using suction linings. 2. A supplementary pipe comprising a branch pipe and a plurality of service pipes.
When repairing, open only the end of the pipeline to be repaired first.
Release and inject resin from here to form a resin plug,
Close the end of the other line and start the suction line
After repairing, the same applies to the next pipeline to be repaired.
2. The method of repairing a pipe line by suction lining according to claim 1, wherein the pipe is repaired. 3. After repairing a branch pipe first, a plurality of pipes are repaired.
Repairs the service pipe and removes the pig from the end of the branch pipe.
Into the tubes to close the ends, and from the end of each
Negative pressure from vacuum pump while supplying compressed gas
3. The method of repairing a pipe line by suction lining according to claim 1 , wherein the resin in the branch pipe is leveled by moving the leveling pig .