JPH09234422A - Method for partially repairing existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for partially repairing an existing pipe which transports a required amt. of resin to the required point (corroding point) of the pipeline and forms a lining resin film at the required point. SOLUTION: A lining pig 3, the lining resin A and a resin transporting pig 5 are successively introduced into the pipe of the existing pipeline 1 from a first aperture 1A and a fluid pressure is added via a tube 6 under inversion to transport the resin, etc., forward. The fluid for transporting the resin is thereafter sucked and discharged outside the pipe from the first aperture 1a and the tube 6 is recovered outside the pipe while the tube is inverted in the direction reverse from the direction described above, by which the resin transporting pig 5, the resin A and the lining pig 3 are moved toward the first aperture 1a, by which the resin is applied on the inside surface of the pipe before and behind a leaking point h.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for partially repairing an existing pipeline by forming a resin lining film on a specific portion of the existing pipeline for repair.

[0002]

2. Description of the Related Art Conventionally, various construction methods have been proposed as a method for rehabilitating pipes that have been corroded by laying for many years.
As an example of such a construction method, for example, a method of applying a resin lining over the entire length of the existing pipeline and forming a resin lining film on the inner wall surface of the pipeline, or introducing an lining tube into the pipeline, There are construction methods such as providing a tube layer on the wall surface.

However, in any of the above-mentioned construction methods, an opening is provided at a predetermined position of the pipeline, and repair is started from this opening. However, it is rare that an opening for work is provided near a portion to be repaired due to housing or road conditions, and repair is often performed including a sound pipeline other than the corroded portion. In this case, most of the resin or tube is wasted, and the work cost becomes high.

As a method of solving the above-mentioned problems, a resin injection nozzle equipped with a resin supply hose is inserted into the pipeline from the opening of the pipeline, and the nozzle is placed at a desired location (corrosion location) in the pipeline. A method is used in which the resin is sprayed from the nozzle onto the inner wall surface of the pipeline to repair it.

[0005]

By the way, in the case of the above-mentioned construction method, when the distance to move the nozzle is long, the length of the resin supply hose is limited, and the nozzle is required to be located at a desired location (corrosion location) in the pipeline. There is a problem that you cannot move to. In addition, when there are many bends such as elbows in the pipeline to be inserted,
The nozzle is caught in the bent portion, and there is a problem in insertability.

The present invention has been devised in order to solve the above-mentioned problems, in which a required amount of resin is conveyed to a required location (corrosion location) of a pipeline, and a lining resin film is provided at the required location. It is intended to provide a method for partially repairing an existing pipeline to be formed.

[0007]

In order to achieve the above-mentioned object, the present invention provides a method for partially repairing an existing pipeline by partially repairing a required portion of the existing pipeline. A lining pig, a required amount of lining resin, and a resin carrying pig were sequentially introduced into the pipe through the opening, and the lining tube having one end fixed to the opening was turned upside down after the resin carrying pig. It is inserted into a pipe, a fluid pressure is applied to the inside of the lining tube, and the pressurizing action advances the reversing folded portion of the tube along the pipe, and at the reversing folded portion of the tube, the lining pig, the lining resin, The resin carrying pig is transferred to a required position in the pipeline, and after the transfer is completed, the lining tube is recovered, and the lining pig, the lining resin, and the resin carrying pig are opened. It is moved towards the side, characterized in that so as to form a lining layer to the required position of the conduit.

[0008] Further, in contrast to an existing pipeline having a first opening on one side and a second opening on the other side, which is a working section, a portion of the existing pipeline for repairing a leak point occurring in the working section. In the repairing method, a pump means for applying a required pressure in the working section and a pressure detecting means for detecting the pressure in the working section are air-tightly communicated with the second opening to form the first opening. A state in which a lining pig, a required amount of lining resin, and a resin carrying pig are successively introduced into the pipe, and the flexible tube having one end fixed to the first opening is turned upside down after the resin carrying pig. Fluid pressure is applied to the lining tube by means of the pressurizing action, and the reversing folded-back portion of the tube is sequentially advanced along the inside of the pipe, and the lining pig, liner The resin and the resin conveying pig are sequentially moved from the first opening portion side toward the second opening portion side in the working section, and after the working section is determined, the pump means is driven to make a predetermined movement in the working section. After applying pressure and confirming the airtightness in the pipeline by the pressure detecting means, the lining tube is recovered and the lining pig, the lining resin, and the resin conveying pig are moved toward the first opening side. The lining film is formed in the vicinity of the leaked portion.

Further, the resin carrying pig is characterized in that it has an outer diameter at least larger than the inner diameter of the conduit and is made of a deformable sponge material.

Further, the above-mentioned tube is provided with an insertion amount detecting means capable of detecting the insertion amount into the existing pipe, and the tube is a one-layer structure tube formed of a flexible elastomer layer. Is characterized by.

Furthermore, the lining pig and the resin carrying pig are connected by a flexible connecting member.

[0012]

According to the partial repairing method of the above-mentioned claim 1, the lining pig, the lining resin, and the resin conveying pig are pushed by the advancing of the lining tube in the pipeline, and the required location (corrosion location) in the pipeline is achieved. I am trying to transport it to. At this time, the lining tube has good insertability into the conduit, and particularly when a tube having a single layer structure formed of an elastomer layer is used, since it is rich in flexibility, the lining tube of the elbow or the like is The lining pig, the lining resin, and the resin carrying pig can be properly transferred because they have sufficient penetrability even in many pipelines. Further, when the tube is provided with the insertion amount detecting means, the positions of the lining pig, the lining resin, and the resin carrying pig can be grasped, and the lining pig, the lining resin, and the resin carrying pig can be accurately transferred to a corroded portion. it can.

Then, after the transfer is completed, the lining tube is recovered. At this time, since the resin transport pig and the resin are airtightly adhered to the inner surface of the conduit, the tube is recovered between the transport pig and the tube as the tube is recovered. Causes negative pressure. Therefore, when the tube is collected, the lining resin and the resin conveying pig come to move toward the opening side, and the movement of the lining pig connected to the conveying pig by the connecting material linings the inner wall surface of the pipe, that is, the corroded portion. A resin film is formed. As a result, it is possible to repair the corroded portion without cutting.

According to the partial repairing method of the second aspect, the pump means for applying a required pressure in the working section and the pressure detecting means for detecting the pressure in the working section on the second opening side. And air-tightly communicate with each other, and the lining pig, the lining resin, and the resin transport pig are sequentially moved to start / stop.
Then, when the progress is stopped, the pump means is driven to apply a required pressure to the working section. for that reason,
When the lining resin or the resin transport pig closes the leaking point occurring in the working section, the working section becomes airtight, so that the pressure in the working section does not drop. This is detected by the pressure detection means, and the tube is recovered, and the lining pig, the lining resin, and the resin transport pig are recovered.
A lining resin film is formed near the leakage point. As a result, it becomes possible to simultaneously detect the leakage and repair the leakage portion.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. In the figure, reference numeral 1 is an existing pipeline buried underground, and the pipeline 1 is provided with an opening 1a exposed on the ground, Part of the corroded or leaked part h is repaired.

In carrying out the partial repair of the pipeline, first, as shown in FIG. 1, the resin injection device 9 is installed in the opening 1a of the pipeline 1.
The tube delivery / storing device 10 is prepared so that it can be connected to the same opening 1a. Further, the fluid injection control device 12 and the fluid pump 1
3 and fluid tank 15 for tube delivery / storage device 10
Are connected in series in sequence.

The resin injection device 9 is preliminarily filled with the lining resin A for repairing the inside of the pipe.
The storage device 10 stores the tube 6 which is flexible and water-impermeable and which is flat and wound around a reel (not shown). The tube 6 is a single-layer tube formed of a flexible elastomer layer (for example, a polyurethane layer). Further, the fluid tank 15 contains a required amount of fluid such as water B.

The work for carrying out the partial repairing method of the first embodiment of the present invention by non-cutting using the above-mentioned equipment structure will be described as follows. First, the position of the corrosion point or the leakage point h in the pipeline 1 is detected by using an existing inspection technique such as ground survey.

Then, a lining pig 3 having a diameter slightly smaller than the inner diameter of the pipe line 1 is inserted into the pipe line 1 through the opening 1a, and then a resin injection device 9 is used to make a necessary amount, that is, a partial lining. Lining resin A required to do
Is injected like a plug into the tube through the opening 1a. And
A resin conveying pig 5 having a diameter slightly larger than the inner diameter of the conduit 1 and made of an elastic material such as sponge is inserted into the conduit 1 through the opening 1a so as to be positioned immediately after the resin A.
Here, the lining pig 3 and the resin carrying pig 5 are connected to each other by a flexible connecting member 2.

Thereafter, the tube delivery / storage device 10 is
It is connected to the opening 1 a of the conduit 1 via the connecting portion 11. Here, as shown in FIG. 2, one end 6a of the tube 6 is
Since it is folded back and fixed to the one end side 11a of the connection portion 11, the tube 6 can be turned over to the existing pipeline 1 while being turned over by the fluid pressure F from the rear side.

Next, by operating the fluid pump 13, the fluid in the fluid tank 15, for example water B, is injected into the tube delivery / accommodation device 10 via the fluid injection control device 12. This fluid pressure causes the tube 6 to deliver the tube.
/ Sequentially sent out from the storage device 10 and reverses along the pipe 1. At this time, since the tube 6 has a single-layer structure formed of an elastomer layer having high flexibility, the tube 6 has good insertability into the conduit 1, and in particular, can be properly inserted even in a bent portion such as an elbow, It reverses and advances in the pipeline 1.

As shown in the enlarged portion of FIG. 1, when the lining tube 6 is reversing and advancing in the conduit 1, the reversing and folding portion 6b of the tube 6 is lined with the lining resin A and the lining pig 3 via the resin conveying pig 5. Thus, the resin conveying pig 5, the lining resin A, and the lining pig 3 are transferred from the opening 1a side. In addition, at this time, since the tube 6 is provided with a measuring scale, the position of the reversing folded portion 6b of the tube 6 introduced into the tube,
That is, since the insertion length of the tube 6 that has been inverted and introduced into the pipe can be grasped from the outside, the positions of the resin conveying pig 5, the lining resin A, and the lining pig 3 can be grasped, and the resin conveying pig 5 can be grasped. , The lining resin A and the lining pig 3 are accurately transferred to the position of the corrosion point or the leakage point h which is detected in advance.

After the transfer is completed, the fluid tank 15, the fluid pump 13, and the fluid injection control device 12 are delivered to the tube.
/ Remove from storage device 10. And fluid recovery tank 1
6 and the suction pump 18 are sequentially connected in series to the tube delivery / storage device 10. Next, the suction pump 18 is operated, and the reel (not shown) that winds the tube 6 is reversed, so that the tube 6 reversely inserted into the tube is reversed from the inside of the tube in the opposite direction. Sequentially collected outside the pipe and wound on a reel. At that time, the fluid B is discharged from the inside of the tube 6, and the fluid recovery tank 16
Will be collected.

Here, when the tube 6 is collected, the resin carrying pig 5 and the lining resin A are airtightly adhered to the inner surface of the conduit 1, so that the tube 6 is collected along with the carrying pig 5.
A negative pressure is generated between the tube 6 and the tube 6. Therefore, when the tube 6 is collected, the lining resin A and the resin carrying pig 5 are moved to the first opening 1a side due to the negative pressure, and are connected to the carrying pig 5 by the connecting member 2. The existing lining pig 3 also moves toward the first opening 1a side. As a result, the lining resin A is lined by the lining pig 3, and a lining resin film is formed on the inner wall surface of the conduit 1, that is, the corroded portion.

Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment is a partial repairing method in which the corrosion location h occurring in the existing pipeline 1 is identified and the corrosion location h is repaired at the same time. The same members as those in the first embodiment are designated by the same reference numerals. The description is omitted.

As shown in the figure, as in the first embodiment, the resin injection device 9 is prepared so that it can be connected to the first opening 1a of the conduit 1, and the tube delivery / storage device 10 is also provided with the same opening. Prepare to connect to 1a. Also,
The fluid injection control device 12, the fluid pump 13, and the fluid tank 15 are sequentially connected in series to the tube delivery / accommodation device 10.

Further, in the second opening 1b on the other end side of the conduit,
A communication pipe 18 provided with a valve 19 is connected. Communication pipe 1
The other end side of 8 is connected to a pressure detecting means 16 equipped with a pressure gauge 17 and an orifice valve 20.
An air pump 15 that applies a required air pressure is communicated with one side of the. The air pump 15 can apply a required pressure to the working section, and the pressure gauge 17 can measure the pressure in the working section.

The work for carrying out the partial repairing method which also serves as a leak detection using the above-mentioned equipment structure will be described as follows.

First, as in the first embodiment described above, the lining pig 3 is inserted into the conduit 1 through the first opening 1a,
Next, using the resin injecting device 9, a required amount of the lining resin A is injected into the pipe from the first opening 1a in a plug shape. Then, the resin carrying pig 5 is inserted into the conduit 1 through the first opening 1a so as to be positioned immediately after the resin A. here,
The lining pig 3 and the resin conveying pig 5 are flexible connecting members 2.
Are interconnected.

Next, the tube delivery / accommodating device 10 is connected to the first opening 1a, the fluid pump 13 is operated to apply the fluid pressure P2 to the tube 6, and the tube 6 is reversed into the pipeline 1. Let As a method of advancing here, for example, the tube is advanced by 50 cm and temporarily stopped, an airtight test is performed, and the tube is sequentially advanced so as to be advanced by 50 cm again. Then, after stopping the tube, the air pump 15 is operated to apply the pressure P1 in the working section. Further, the pressure detection means 16 and the fluid injection control device 12 are adjusted so that the relationship of P1 <P2 is satisfied, so that the tube 6 properly inverts and advances inside the conduit 1.

In the process of transferring the lining pig 3, the lining resin A, and the resin carrying pig 5 from the first opening 1a side to the second opening 1b side while the tube 6 is reversed and advanced in this manner, the lining resin When A or the resin conveying pig 5 closes the leaking point h occurring in the pipe line 1, the working section becomes airtight, so that the pressure drop in the working section disappears. This is detected by the pressure detection means 16 and the tube 6 is recovered, and the lining pig 3, the lining resin A, and the resin transport pig 5 are recovered, and a lining resin film is formed in the vicinity of the leakage point h. As a result, it becomes possible to simultaneously detect the leakage and repair the leakage portion.

Even if an incompressible hydraulic flow is used as the fluid pressure in the partial repairing method of the first and second embodiments described above, the hydraulic flow is introduced into the lining tube 6. Therefore, the phenomenon that water is mixed into the resin A is completely avoided during the transfer process of the lining resin.

Although water is used as the fluid pressure during resin transfer in the above-described embodiments, the method of the present invention is not limited to this, and other fluids such as air may be used.

[0034]

EFFECTS OF THE INVENTION According to the method of the present invention, a required amount of resin can be properly conveyed to a corroded portion without cutting, even for a pipeline having many bends such as an elbow. It is possible to repair the part with a simple resin lining. As a result, it becomes possible to carry out an appropriate partial repair at a low work cost.

According to the second aspect of the present invention, since the leakage position can be specified and the leakage place can be repaired at the same time, it is possible to omit the leakage detection performed before the repair, and the working time can be reduced. Can be shortened, and further, work labor and work cost can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a construction state during resin transfer according to a first embodiment of the present invention.

[Fig. 2] Delivery of an inner lining tube used in the method of the present invention
/ Cross section of the storage device

FIG. 3 is an explanatory view showing a construction state at the time of resin lining according to the first embodiment of the present invention.

FIG. 4 is an explanatory view showing a construction state during resin transfer according to a second embodiment of the present invention.

[Explanation of symbols]

 1 Existing Pipeline for Work 1a First Opening Portion of Existing Pipeline 1b Second Opening Portion of Existing Pipeline 1c Resin Membrane 2 Flexible Connecting Material 3 Lining Pig 5 Resin Transfer Pig 6 Inner Tube 6a One End of Inner Tube 6b Folded part of lined tube 9 Resin injection device 10 Tube delivery / storage device 11 Connection part of tube delivery / storage device 11a One end of connection part 12 Fluid injection control device 13 Fluid pump 15 Fluid tank 16 Pressure detection means 17 Pressure gauge 18 Communication pipe 19 Valve 20 Orifice valve 25 Air pump h Leakage point A Resin B Liquid F Fluid pressure

Claims (6)

[Claims] 1. A method for partially repairing an existing pipeline, which partially repairs a required portion of the existing pipeline, wherein a lining pig is inserted into the pipe from an end opening of the existing pipeline.
A required amount of lining resin and resin conveying pig are sequentially introduced, and after the resin conveying pig, the lining tube whose one end is fixed to the opening is turned upside down and inserted into the pipe. A fluid pressure is applied to the inside of the tube, and the pressurizing action advances the reversing folded portion of the tube along the inside of the pipe, and at the time of the reversing folded portion of the tube, the lining pig, the lining resin, and the resin conveying pig are provided in the pipe. After the transfer is completed, the lining tube is recovered after the transfer is completed, and the lining pig, the lining resin, and the resin transfer pig are moved toward the opening side so that a lining film is formed at a required position of the pipeline. Partial repair method for existing pipelines characterized by 2. A portion of an existing pipeline for repairing a leak point occurring in the working section, with respect to an existing pipeline having a first opening on one side and a second opening on the other side, which is a working section. In the repair method, a pump means for applying a required pressure in the working section and a pressure detecting means for detecting the pressure in the working section are air-tightly connected to the second opening, and the first opening is provided. A state in which a lining pig, a required amount of lining resin, and a resin carrying pig are successively introduced into the pipe, and the flexible tube having one end fixed to the first opening is turned upside down after the resin carrying pig. The inside of the lining tube by applying a fluid pressure, and the pressurizing action causes the reversing fold portion of the tube to sequentially advance along the inside of the pipe, and the lining pig and lining at the reversing fold portion of the tube. The resin and the resin transfer pig are the first
The working section is sequentially moved from the opening side toward the second opening side, and after the working section is determined, the pump means is driven to apply a predetermined pressure to the working section, and the pressure detecting means is used. After confirming the airtightness in the pipeline,
The lining tube is collected, and the lining pig, the lining resin, and the resin transport pig are moved toward the first opening side to form a lining film near the leakage location. Partial repair method for pipelines. 3. The existing pipeline according to claim 1, wherein the resin conveying pig has an outer diameter at least larger than an inner diameter of the pipeline and is formed of a deformable sponge material. Partial repair method. 4. The method for partially repairing an existing pipeline according to claim 1, wherein the tube is provided with an insertion amount detecting means capable of detecting an insertion amount into the existing pipe. 5. The method for partially repairing an existing pipeline according to claim 1, wherein the tube is a single-layer tube formed of a flexible elastomer layer. 6. The method for partially repairing an existing pipeline according to claim 1, wherein the lining pig and the resin carrying pig are connected by a flexible connecting member.