JP3556041B2 - Partial repair method for existing pipeline - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method of repairing an existing pipeline by forming a resin lining film on a specific portion of the existing pipeline and repairing the same.
[0002]
[Prior art]
BACKGROUND ART Conventionally, various methods have been proposed as a method of rehabilitating and repairing a pipeline that has been corroded by laying for many years. As an example of such a construction method, for example, a construction method in which a resin lining is applied over the entire length of an existing pipeline and a resin lining film is formed on the inner wall surface of the pipeline, or a lining tube is introduced into the pipeline, and the inside of the pipeline is introduced. There is a construction method such as providing a tube layer on a wall surface.
[0003]
However, in any of the above-described construction methods, an opening is provided at a predetermined location in a pipeline, and repair is started from this opening. However, work openings are rarely provided near locations where repairs are desired due to housing or road conditions, and repairs are often performed including sound pipes other than corroded locations. In this case, most of the resin or the tube is wasted, and the operation cost is increased.
[0004]
As a method of solving the above-mentioned problem, a resin injection nozzle provided with a resin supply hose is inserted into the pipeline from the opening of the pipeline, and the nozzle is moved to a required portion (corrosion location) in the pipeline. Thereafter, a method of repairing the resin by spraying a resin from the nozzle onto the inner wall surface of the pipeline is used.
[0005]
[Problems to be solved by the invention]
By the way, in the case of the above-described method, when the distance for moving the nozzle is long, there is a problem that the length of the resin supply hose is limited, and the nozzle cannot be moved to a required portion (corrosion portion) in the pipeline.
Further, when there are many bent portions such as elbows in the pipe to be inserted, the nozzle is caught by the bent portions, and there is a problem in the insertability.
[0006]
The present invention has been devised in order to solve the above-mentioned problems, and has been developed to transport a required amount of resin to a required portion (corrosion portion) of a pipeline and form a lining resin film at the required portion. The purpose is to provide a partial repair method for pipelines.
[0007]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a method for partially repairing an existing pipeline in which a required portion of the existing pipeline is partially repaired.
A lining pig, a required amount of lining resin, and a resin transport pig are sequentially introduced into the pipe from an end opening of the existing pipeline, and a lining tube having one end fixed to the opening is provided at a stage subsequent to the resin transport pig. Insert it inside the tube with it turned upside down,
A fluid pressure is applied to the lining tube, and the pressurizing action causes the reversing folded portion of the tube to advance along the inside of the tube, and the lining pig, the lining resin, and the resin transfer pig are piped at the reversed turning portion of the tube. After the transfer, the lining tube is recovered, and the lining pig, the lining resin, and the resin transport pig are moved toward the opening, and the lining film is transferred to the required portion of the pipeline. It is characterized in that it is formed.
[0008]
Further, in an existing pipeline having a first opening on one side and a second opening on the other side serving as a working section, a partial repair method of an existing pipeline for repairing a leak point occurring in the working section. ,
Pump means for applying a required pressure in the working section, and pressure detecting means for detecting pressure in the working section, are hermetically connected to the second opening,
A lining pig, a required amount of lining resin, and a resin transport pig are sequentially introduced into the pipe from the first opening, and a flexible tube having one end fixed to the first opening is turned upside down after the resin transport pig. Insert it into the tube with it turned upside down,
A fluid pressure is applied to the lining tube, and the pressurizing action causes the turn-back portion of the tube to sequentially advance along the inside of the tube. At the turn-back portion of the tube, the lining pig, the lining resin, and the resin transport pig are moved. Sequentially moving in the working section from the first opening side to the second opening side,
After the work section is determined, the pump means is driven to apply a predetermined pressure in the work section,
After the airtightness in the pipeline is confirmed by the pressure detecting means, the lining tube is recovered, and the lining pig, the lining resin, and the resin transport pig are moved toward the first opening side, and the leakage point is detected. A lining film is formed in the vicinity.
[0009]
Further, the resin transport pig has an outer diameter at least larger than the inner diameter of the pipe, and is formed of a deformable sponge material.
[0010]
Still further, the tube is provided with an insertion amount detecting means capable of detecting an insertion amount into the existing tube, and the tube is a single-layer tube formed of a flexible elastomer layer. I do.
[0011]
Furthermore, the lining pig and the resin transport pig are connected by a flexible connecting member.
[0012]
[Action]
According to the partial repair method described in claim 1, the lining pig, the lining resin, and the resin transport pig are transported to a required portion (corrosion portion) in the pipeline by a pushing action accompanying the progress of the lining tube in the pipeline. Like that.
At this time, the lining tube has good penetrability into a pipe, and particularly when a tube having a single-layer structure formed of an elastomer layer is used, the lining tube is rich in flexibility, so that a bent portion such as an elbow is used. Since the lining pig, the lining resin, and the resin transport pig can be properly transferred since the lining pig, the lining resin, and the resin transport pig are sufficiently inserted into many pipes. Furthermore, when the insertion amount detecting means is provided in the tube, the position 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 the corroded portion. it can.
[0013]
Then, after the transfer is completed, the lining tube is collected. At this time, since the resin transfer pig and the resin are air-tightly adhered to the inner surface of the pipeline, a negative pressure is applied between the transfer pig and the tube as the tube is collected. Occurs.
Therefore, when the tube is collected, the lining resin and the resin transporting pig move toward the opening, and the lining pig connected to the transporting pig by the connecting member moves to line the inner wall of the pipe line, that is, the corroded portion. A resin film is formed.
As a result, the corroded portion can be repaired without cutting.
[0014]
According to the partial repair method, 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 are hermetically sealed on the second opening side. The lining pig, the lining resin, and the resin transporting pig are sequentially moved as they proceed and stop.
Then, at the time when the movement is stopped, the pump means is driven to apply a required pressure to the working section. Therefore, when the lining resin or the resin transport pig closes a leak point occurring in the work section, the work section becomes airtight, and the pressure in the work section does not drop. This is detected by the pressure detecting means, and the tube is collected, and the lining pig, the lining resin, and the resin transport pig are collected, and a lining resin film is formed near the leaked portion. As a result, the leak detection and the repair of the leak location can be performed simultaneously.
[0015]
【Example】
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
In the figure, reference numeral 1 denotes an existing pipeline buried underground, and the pipeline 1 has an opening 1a that is exposed above the ground. The corroded or leaked part h is partially repaired.
[0016]
When performing the above-mentioned partial repair of the pipeline, first, as shown in FIG. 1, a resin injection device 9 is prepared so as to be connected to the opening 1a of the pipeline 1, and the tube delivery / storage device 10 is connected to the same opening 1a. Prepare to connect to. Further, the fluid injection control device 12, the fluid pump 13, and the fluid tank 15 are connected to the tube delivery / storage device 10 in series.
[0017]
Although the lining resin A for in-pipe repair is previously contained in the resin injection device 9, the tube delivery / storage device 10 has a flat shape having flexibility and water blocking properties on a reel (not shown). The wound tube 6 is stored. The tube 6 is a single-layer tube formed of a flexible elastomer layer (for example, a polyurethane layer). The fluid tank 15 contains a required amount of fluid, for example, water B.
[0018]
The operation of performing the partial repair method according to the first embodiment of the present invention by non-cutting using the above-described facility configuration will be described as follows.
First, the position of a corroded portion or a leaked portion h in the pipe line 1 is detected by using an existing inspection technique such as a ground survey.
[0019]
Then, a lining pig 3 having a diameter slightly smaller than the inner diameter of the pipeline 1 is inserted into the pipeline 1 through the opening 1a, and then the resin injection device 9 is used to perform a necessary amount, that is, a partial lining. The necessary lining resin A is injected into the tube from the opening 1a in a plug shape. Then, a resin transport pig 5 having a diameter slightly larger than the inner diameter of the pipe 1 and made of an elastic material such as sponge is inserted into the pipe 1 through the opening 1a so as to be located immediately after the resin A. . Here, the lining pig 3 and the resin transport pig 5 are interconnected by the flexible connecting member 2.
Thereafter, the tube delivery / storage device 10 is connected to the opening 1a of the conduit 1 via the connection portion 11. Here, as shown in FIG. 2, one end 6a of the tube 6 is folded back and fixed to one end 11a of the connection portion 11, so that the tube 6 is turned over by the fluid pressure F from the rear to the existing pipeline 1 while being turned upside down. It can be turned around.
[0021]
Next, by operating the fluid pump 13, the fluid in the fluid tank 15, for example, water B, is injected into the tube delivery / storage device 10 via the fluid injection control device 12. Due to this fluid pressure, the tubes 6 are sequentially delivered from the tube delivery / storage device 10 and reversely travel along the inside of the pipeline 1. At this time, since the tube 6 has a one-layer structure formed of a highly flexible elastomer layer, the tube 6 has a good insertion property into the pipe line 1, and particularly, can be properly inserted even in a bent portion such as an elbow. The inside of the pipe 1 is reversed.
[0022]
As shown in the enlarged portion of FIG. 1, when the lining tube 6 is inverting and proceeding in the pipeline 1, the reversing folded portion 6 b of the tube 6 moves the lining resin A and the lining pig 3 forward through the resin transport pig 5. As a result, the resin transport pig 5, the lining resin A, and the lining pig 3 are transferred from the opening 1a side. At this time, since the measurement scale is attached to the tube 6, the position of the inverted turn-back portion 6b of the tube 6 introduced into the tube, that is, the insertion length of the tube 6 inverted into the tube, is grasped from outside. Therefore, the positions of the resin transport pig 5, the lining resin A, and the lining pig 3 can be grasped, and the corrosion spot or the leak location where the resin transport pig 5, the lining resin A, and the lining pig 3 are detected in advance. Transfer accurately to the position of h.
[0023]
After the transfer is completed, the fluid tank 15, the fluid pump 13, and the fluid injection control device 12 are removed from the tube delivery / storage device 10. Then, the fluid recovery tank 16 and the suction pump 18 are sequentially connected to the tube delivery / storage device 10 in series. Next, by operating the suction pump 18 and reversing the reel (not shown) for winding the tube 6, the tube 6 reversely inserted into the tube is inverted from the inside of the tube in the opposite direction to the above. It is sequentially collected outside the tube and wound on a reel. At that time, the fluid B is discharged from the tube 6 and collected in the fluid collection tank 16.
[0024]
Here, when the tube 6 is collected, the resin transporting pig 5 and the lining resin A are airtightly adhered to the inner surface of the pipe 1. Pressure occurs.
Therefore, when the tube 6 is recovered, the lining resin A and the resin transport pig 5 move toward the first opening 1a due to the negative pressure, and are connected to the transport pig 5 by the connecting member 2. The lining pig 3 is also moved toward the first opening 1a. 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 pipeline 1, that is, on a corroded portion.
[0025]
Next, a second embodiment of the present invention will be described with reference to FIG.
The second embodiment is a partial repairing method for simultaneously specifying a corroded portion h occurring in the existing pipeline 1 and repairing the corroded portion h. The same reference numerals as those in the first embodiment denote the same members. The description is omitted here.
[0026]
As shown in the figure, similarly to the first embodiment, a resin injection device 9 is prepared so as to be connectable to the first opening 1a of the conduit 1, and a tube delivery / storage device 10 is connected to the same opening 1a. Be prepared to do so. Further, the fluid injection control device 12, the fluid pump 13, and the fluid tank 15 are connected to the tube delivery / storage device 10 in series.
[0027]
In addition, a communication pipe 18 having a valve 19 is connected to the second opening 1b at the other end of the pipe. The other end of the communication pipe 18 is connected to a pressure detecting means 16 having a pressure gauge 17 and an orifice valve 20, and one side of the pressure detecting means 16 is connected to an air pump 15 for applying a required air pressure. The air pump 15 can apply a required pressure in the work section, and the pressure gauge 17 can measure the pressure in the work section.
[0028]
The operation of performing the partial repair method also serving as leakage detection using the above-described facility configuration will be described as follows.
[0029]
First, as in the first embodiment described above, the lining pig 3 is inserted into the pipeline 1 through the first opening 1a, and then a required amount of the lining resin A is poured into the first opening using the resin injection device 9. A plug is injected into the tube from the part 1a. Then, the resin transport pig 5 is inserted into the pipeline 1 through the first opening 1a so as to be located immediately after the resin A. Here, the lining pig 3 and the resin transport pig 5 are mutually connected by the flexible connecting member 2.
[0030]
Next, the tube delivery / storage device 10 is connected to the first opening 1a, and the fluid pump 13 is operated to apply the fluid pressure P2 to the tube 6, thereby causing the tube 6 to reversely advance into the pipeline 1. Here, as a method of proceeding, for example, the tube is advanced by 50 cm, temporarily stopped, an airtight test is performed, and the tube is sequentially advanced so as to advance again by 50 cm.
After stopping the tube, the air pump 15 is operated to apply the pressure P1 to the working section.
Further, the pressure detecting 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 can appropriately reversely advance in the pipeline 1.
[0031]
In the process of transferring the lining pig 3, the lining resin A, and the resin transporting pig 5 from the first opening 1a side to the second opening 1b side while the tube 6 is turned over in this manner, the lining resin A or the resin When the transport pig 5 closes the leak location h occurring in the pipeline 1, the working section becomes airtight, and the pressure drop in the working section is eliminated.
This is detected by the pressure detecting means 16, and the tube 6 is recovered, and the lining pig 3, the lining resin A, and the resin transporting pig 5 are recovered, and a lining resin film is formed near the leak location h. As a result, the leak detection and the repair of the leak location can be performed simultaneously.
[0032]
In the above-described partial repair method of the first embodiment and the second embodiment, even if an incompressible hydraulic flow is used as the fluid pressure, the hydraulic flow is introduced into the lining tube 6. The phenomenon that water is mixed into the resin A during the resin transfer process is completely avoided.
[0033]
Further, in the above-described embodiment, the description has been made using water as the fluid pressure at the time of transferring the resin. However, the construction method of the present invention is not limited to this, and another fluid such as air may be used.
[0034]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the construction method of this invention, even to the pipeline with many bent parts, such as an elbow, it is possible to properly convey a required amount of resin to a corroded portion without cutting, and furthermore, a simple resin It becomes possible to repair by lining.
As a result, appropriate partial repair can be performed at a low operation cost.
[0035]
According to the second aspect of the present invention, since it is possible to simultaneously specify the leak position and repair the leak location, it is possible to omit the leak detection performed before the repair, and to shorten the working time. In addition, it is possible to reduce the work labor and the work cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a construction state at the time of resin transfer according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view showing a delivery / storage device for a lining tube used in the method of the present invention; FIG. FIG. 4 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 at the time of resin transfer according to a second embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Existing pipeline 1a to be worked 1st opening 1b of existing pipeline 2c opening of existing pipeline 1c Resin film 2 Flexible connection material 3 Lining pig 5 Resin transport pig 6 Inner tube 6a One end of inner tube 6b Folded portion of lining tube 9 Resin injection device 10 Tube delivery / storage device 11 Tube delivery / storage device connection portion 11a One end of connection portion 12 Fluid injection control device 13 Fluid pump 15 Fluid tank 16 Pressure detecting 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)

In the partial repair method of the existing pipeline, which partially repairs the required parts of the existing pipeline,
A lining pig, a required amount of lining resin, and a resin transport pig are sequentially introduced into the pipe from an end opening of the existing pipeline, and a lining tube having one end fixed to the opening is provided at a stage subsequent to the resin transport pig. Insert it inside the tube with it turned upside down,
A fluid pressure is applied to the lining tube, and the pressurizing action causes the reversing folded portion of the tube to advance along the inside of the tube, and the lining pig, the lining resin, and the resin transfer pig are piped at the reversed turning portion of the tube. Transfer to the required part of the road,
After the transfer is completed, the lining tube is recovered, and the lining pig, the lining resin, and the resin transporting pig are moved toward the opening to form a lining film at a required portion of the pipeline. Partial repair method for existing pipelines. In a partial repair method of an existing pipeline for repairing a leak point occurring in the above-mentioned working section, for an existing pipeline having a first opening on one side and a second opening on the other side which is a working section,
Pump means for applying a required pressure in the working section, and pressure detecting means for detecting pressure in the working section, are hermetically connected to the second opening,
A lining pig, a required amount of lining resin, and a resin transport pig are sequentially introduced into the pipe from the first opening, and a flexible tube having one end fixed to the first opening is turned upside down after the resin transport pig. Insert it into the tube with it turned upside down,
A fluid pressure is applied to the lining tube, and the pressurizing action causes the turn-back portion of the tube to sequentially advance along the inside of the tube. At the turn-back portion of the tube, the lining pig, the lining resin, and the resin transport pig are moved. Sequentially moving in the working section from the first opening side to the second opening side,
After the work section is determined, the pump means is driven to apply a predetermined pressure in the work section,
After the airtightness in the pipeline is confirmed by the pressure detecting means, the lining tube is recovered, and the lining pig, the lining resin, and the resin transport pig are moved toward the first opening side, and the leakage point is detected. A partial repair method for an existing pipeline characterized by forming a lining film in the vicinity. 3. The method according to claim 1, wherein the resin transport pig has an outer diameter at least larger than an inner diameter of the pipeline and is formed of a deformable sponge material. 3. The method according to claim 1, wherein said tube is provided with an insertion amount detecting means capable of detecting an insertion amount into the existing pipe. 4. The method according to claim 1, wherein the tube is a single-layer tube formed of a flexible elastomer layer. The method according to claim 1, wherein the lining pig and the resin transport pig are connected by a flexible connecting member.

Images