Pipeline point-based in-situ curing trenchless repair construction method

Abstract

This invention discloses a trenchless, point-based in-situ curing method for pipeline repair, comprising the following steps: S1. Preparing a corresponding quantity of repair resin adhesive according to the specifications and quantity of the pipeline to be repaired; S2. Cutting a corresponding quantity of fiberglass cloth according to the specifications and quantity of the pipeline to be repaired; S3. Impregnating the fiberglass cloth from step S2 with the repair resin adhesive prepared in step S1 to form a wet liner, then wrapping the wet liner around a repair airbag to form a repair body, and moving the repair body to the defect location of the pipeline to be repaired; S4. Inflating the repair airbag to make the repair body expand and adhere tightly to the inner wall of the pipeline to be repaired, monitoring the hardness change of the repair resin adhesive in the wet liner in real time, and depressurizing the repair airbag when the hardness reaches a set value. At this time, the wet liner solidifies at the defect location of the pipeline to be repaired, thereby separating from the repair airbag, and then removing the repair airbag to complete the repair of the pipeline to be repaired; this method can improve the quality of pipeline repair.

Description

Technical Field

[0001] This invention relates to the field of pipeline construction technology, and in particular to a non-excavation repair method for point-based in-situ solidification of pipelines. Background Technology

[0002] Cured-in-Place Pipe (CIPP) is a trenchless technology widely used in pipeline repair for drainage, petroleum, and chemical industries. Point-based CIPP (also known as localized resin curing) is a highly efficient method for repairing localized pipeline defects such as cracks, misaligned joints, and corrosion pits. The traditional construction process mainly includes: calculating material usage based on defect dimensions; manually cutting fiberglass cloth; manually weighing and mixing resin and curing agent; coating the fiberglass cloth with resin to create a wet liner; installing the wet liner onto a repair airbag and placing it at the defect; inflating the airbag to ensure the liner adheres to the pipe wall; maintaining pressure until the resin cures; and finally removing the airbag.

[0003] However, this traditional method has the following significant drawbacks: 1) Low precision and efficiency in material preparation: Resin formulation relies on manual calculation and weighing, which is prone to errors and inefficient when multiple specifications and repair points are being constructed simultaneously; fiberglass cloth cutting relies on manual measurement and cutting, resulting in poor dimensional accuracy, low efficiency, and poor material utilization. 2) Subjective and crude control of the curing process: The determination of curing time largely depends on the experience of the construction personnel or a pre-set fixed time. The former is highly subjective and prone to under-curing (insufficient strength) or over-curing (waste of energy and time) due to differences in individual judgment; the latter cannot adapt to the influence of environmental temperature, humidity, and batch differences in resin, and lacks scientific rigor. These problems directly affect the uniformity and reliability of repair quality and the overall construction efficiency.

[0004] Therefore, it is necessary to improve the existing pipeline repair methods to achieve standardized operations and improve the quality and efficiency of pipeline repair. Summary of the Invention

[0005] In view of this, the purpose of this invention is to provide a non-excavation repair method for pipeline point-based in-situ solidification, so as to achieve standardized operation and improve the repair quality and construction efficiency of pipelines.

[0006] The pipeline point-based in-situ solidification trenchless repair construction method of the present invention includes the following steps:

[0007] S1. Prepare the appropriate amount of repair resin solution according to the specifications and quantity of the pipes to be repaired;

[0008] S2. Cut the appropriate amount of fiberglass cloth according to the specifications and quantity of the pipe to be repaired;

[0009] S3. The glass fiber cloth from step S2 is impregnated in the repair resin solution prepared in step S1 to form a wet liner. The wet liner is then wrapped around the repair airbag to form a repair body. The repair body is then moved to the defect location of the pipe to be repaired.

[0010] S4. Inflate the repair airbag to make the repair body expand and adhere tightly to the inner wall of the pipe to be repaired. Monitor the hardness change of the repair resin in the wet liner in real time. When the hardness reaches the set value, depressurize the repair airbag. At this time, the wet liner solidifies at the defect position of the pipe to be repaired, thus separating from the repair airbag. Then remove the repair airbag to complete the repair of the pipe.

[0011] Further, in step S1, a resin preparation mechanism is used to prepare the resin solution. The resin preparation mechanism includes a storage tank I, a storage tank II, and a stirrer. The storage tank I is connected to the stirrer through a conveying pipe I, and the storage tank II is connected to the stirrer through a conveying pipe II. The storage tank I is used to store the resin solution, and the storage tank II is used to store the curing agent. The conveying pipe I is equipped with a resin metering pump, and the conveying pipe II is equipped with a curing agent metering pump.

[0012] Further, in step S2, a cutting mechanism is used to cut the fiberglass cloth. The cutting mechanism includes a frame, a feed roller, a conveyor roller assembly, and a cutting assembly. The feed roller is disposed on the frame for placing the fiberglass cloth roll. The conveyor roller assembly is disposed on the frame and located next to the feed roller for conveying the fiberglass cloth. The cutting assembly is disposed next to the conveyor roller assembly for cutting the fiberglass cloth conveyed by the conveyor roller assembly to form fiberglass cloth of a set size.

[0013] Furthermore, the conveying roller assembly comprises at least two sets, which are spaced apart along the conveying direction of the fiberglass cloth, wherein the set of conveying roller assemblies closest to the cutting assembly is equipped with a positioning sensor.

[0014] Furthermore, in step S3, the repair airbag is equipped with an air inlet and a pressure relief valve.

[0015] Furthermore, in step S3, a hardness sensor is provided at a set position on the outer surface of the repair airbag, and the hardness sensor is used to obtain the hardness data of the repair resin liquid of the wet liner.

[0016] Furthermore, step S4 also includes a control unit, which is electrically connected to the resin metering pump, the curing agent metering pump, the positioning sensor, and the hardness sensor, respectively.

[0017] Furthermore, in step S4, the set value is determined based on the standard curing curve of the target resin material.

[0018] Furthermore, the cutting mechanism also includes a semi-finished product conveyor belt disposed on the frame and located at the discharge port of the cutting component.

[0019] The beneficial effects of this invention are as follows: The pipeline point-based in-situ curing trenchless repair construction method of this invention achieves precise control throughout the entire process, from resin ratio and lining size to curing degree, minimizing human error and ensuring uniform and reliable quality at each repair point, meeting high-standard engineering requirements. At the same time, it can realize standardized pipeline repair operations, reducing the excessive requirements on workers' personal experience and skills at the construction site, and is conducive to construction management, greatly improving work efficiency and construction quality. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a flowchart of the pipeline point-based in-situ solidification trenchless repair construction method of the present invention;

[0022] Figure 2 This is a schematic diagram of the cutting mechanism;

[0023] Figure 3 This is a structural diagram showing the fit between the prosthesis and the pipe.

[0024] Figure 4 This is a schematic diagram of the resin preparation mechanism.

[0025] Figure label:

[0026] 1. Frame; 2. Feeding roller; 3. Fiberglass cloth; 4. Conveyor roller assembly; 5. Cutting assembly; 6. Semi-finished product conveyor belt; 7. Pipeline; 8. Wet lining; 9. Repair airbag; 10. Hardness sensor; 11. Storage tank II; 12. Curing agent metering pump; 13. Storage tank I; 14. Resin metering pump; 15. Conveying pipeline I; 16. Conveying pipeline II; 17. Agitator; 18. Switch. Detailed Implementation

[0027] like Figure 1-4 As shown: The non-excavation repair method for point-based in-situ curing of pipelines in this embodiment includes the following steps:

[0028] S1. Prepare the appropriate amount of repair resin solution according to the specifications and quantity of the pipes to be repaired;

[0029] S2. Cut the appropriate amount of fiberglass cloth 3 according to the specifications and quantity of the pipe to be repaired;

[0030] S3. The glass fiber cloth 3 from step S2 is impregnated in the repair resin solution prepared in step S1 to form a wet liner 8. Then the wet liner 8 is wrapped around the repair airbag 9 to form a repair body. The repair body is moved to the defect location of the pipe 7 to be repaired.

[0031] S4. Inflate the repair airbag 9 to make the repair body expand and adhere tightly to the inner wall of the pipe 7 to be repaired. Monitor the hardness change of the repair resin in the wet liner 8 in real time. When the hardness reaches the set value, depressurize the repair airbag 9. At this time, the wet liner 8 solidifies at the defect position of the pipe 7 to be repaired, thereby separating from the repair airbag 9. Then remove the repair airbag 9 to complete the repair of the pipe 7 to be repaired.

[0032] Specifically, the repair resin adhesive consists of resin adhesive and curing agent. Fiberglass cloth 3 is impregnated in the repair resin adhesive to form a wet liner 8, which is then wrapped around the outer surface of the repair airbag 9. The repair body is quickly placed at the defect location of the pipe 7 to be repaired, and the repair airbag 9 is inflated, so that the wet liner 8 adheres tightly to the inner wall of the pipe 7 to be repaired. Once the repair resin adhesive has cured, the repair of the pipe 7 to be repaired is completed. The entire construction process can achieve standardized operation, greatly improving construction efficiency and construction quality.

[0033] In this embodiment, in step S1, a resin preparation mechanism is used to prepare the resin solution. The resin preparation mechanism includes a storage tank I 13, a storage tank II 11, and a stirrer 17. The storage tank I 13 is connected to the stirrer 17 through a conveying pipe I 15, and the storage tank II 11 is connected to the stirrer 17 through a conveying pipe II 16. The storage tank I 13 is used to store the resin solution, and the storage tank II 11 is used to store the curing agent. The conveying pipe I 15 is equipped with a resin metering pump 14, and the conveying pipe II 16 is equipped with a curing agent metering pump 12.

[0034] like Figure 4 As shown, the outlet of the agitator 17 is provided with an output pipe, and the output pipe is equipped with a switch 18, which facilitates the control of the discharge of the repair resin liquid. The resin liquid is precisely controlled by the resin metering pump 14, and the curing agent is precisely controlled by the curing agent metering pump 12. Therefore, compared with manual weighing, the accuracy of the material feeding can be improved.

[0035] In this embodiment, in step S2, a cutting mechanism is used to cut the fiberglass cloth 3. The cutting mechanism includes a frame 1, a feed roller 2, a conveyor roller assembly 4, and a cutting assembly 5. The feed roller 2 is disposed on the frame 1 for placing the fiberglass cloth roll. The conveyor roller assembly 4 is disposed on the frame 1 and located next to the feed roller 2 for conveying the fiberglass cloth 3. The cutting assembly 5 is disposed next to the conveyor roller assembly 4 for cutting the fiberglass cloth 3 conveyed by the conveyor roller assembly 4 to form a fiberglass cloth 3 of a set size.

[0036] The cutting mechanism includes a cutting blade, a drive motor, a support frame, and other structures, which facilitates the cutting of the fiberglass cloth 3.

[0037] In this embodiment, there are at least two sets of conveying roller assemblies 4, which are spaced apart along the conveying direction of the fiberglass cloth 3. The set of conveying roller assemblies 4 closest to the cutting assembly 5 is equipped with a positioning sensor. For example... Figure 2 As shown, the two sets of conveyor roller assemblies 4 maintain a set distance. The conveyor roller assembly 4 includes two rollers, a support frame and a drive motor, etc., which are existing technologies and will not be described in detail here.

[0038] In this embodiment, in step S3, the repair airbag 9 is equipped with an air inlet and a pressure relief valve. After the repair resin has cured to the set hardness, the repair airbag 9 is depressurized, thereby separating the repair airbag 9 from the wet liner 8, making it easier to remove the repair airbag 9 for reuse.

[0039] In this embodiment, in step S3, a hardness sensor 10 is provided at a predetermined position on the outer surface of the repair airbag 9. The hardness sensor 10 is used to acquire the hardness data of the repair resin adhesive of the wet liner 8. There can be several hardness sensors 10, which are disposed on the outer surface of the repair airbag 9, so that the hardness sensor 10 is disposed between the repair airbag 9 and the wet liner 8, which facilitates monitoring the degree of curing of the repair resin adhesive of the wet liner 8.

[0040] In this embodiment, step S4 further includes a control unit, which is electrically connected to the resin metering pump 14, the curing agent metering pump 12, the positioning sensor, and the hardness sensor 10. The control unit is generally a combination of a CPU and peripheral circuitry. Based on the specific defects in the pipeline to be repaired, it calculates the required amount of repair resin adhesive, thereby calculating the required amounts of resin adhesive and curing agent. It controls the operation of the resin metering pump 14 and the curing agent metering pump 12, thus eliminating human error in calculation and weighing, and enabling batch, accurate, and rapid material preparation for multiple specifications. The control unit controls the operation of the cutting assembly 5 based on data from the positioning sensor, thereby achieving precise cutting of the fiberglass cloth 3.

[0041] In this embodiment, in step S4, the set value is determined based on the standard curing curve of the target resin material. Therefore, when the hardness of the repair resin reaches the set value, the control unit alerts the operator to the completion of curing based on the hardness information from the hardness sensor 10. This completely eliminates the traditional method of relying on experience or fixed times during construction, ensuring the objectivity and scientific nature of the curing endpoint determination.

[0042] In this embodiment, the cutting mechanism further includes a semi-finished product conveyor belt 6 disposed on the frame 1 and located at the discharge port of the cutting assembly 5. The semi-finished product conveyor belt 6 also includes a drive motor and two rollers. The drive motor drives one roller, which in turn drives the other roller to rotate through the semi-finished product conveyor belt 6, thereby realizing the conveying of the semi-finished product.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for trenchless repair of pipelines using point-based in-situ curing, characterized in that: Includes the following steps: S1. Prepare the appropriate amount of repair resin solution according to the specifications and quantity of the pipes to be repaired; S2. Cut the appropriate amount of fiberglass cloth according to the specifications and quantity of the pipe to be repaired; S3. The glass fiber cloth from step S2 is impregnated in the repair resin solution prepared in step S1 to form a wet liner. The wet liner is then wrapped around the repair airbag to form a repair body. The repair body is then moved to the defect location of the pipe to be repaired. S4. Inflate the repair airbag to make the repair body expand and adhere tightly to the inner wall of the pipe to be repaired. Monitor the hardness change of the repair resin in the wet liner in real time. When the hardness reaches the set value, depressurize the repair airbag. At this time, the wet liner solidifies at the defect position of the pipe to be repaired, thus separating from the repair airbag. Then remove the repair airbag to complete the repair of the pipe.

2. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 1, characterized in that: In step S1, a resin preparation mechanism is used to prepare the resin solution. The resin preparation mechanism includes a storage tank I, a storage tank II, and a stirrer. The storage tank I is connected to the stirrer through a conveying pipe I, and the storage tank II is connected to the stirrer through a conveying pipe II. The storage tank I is used to store the resin solution, and the storage tank II is used to store the curing agent. The conveying pipe I is equipped with a resin metering pump, and the conveying pipe II is equipped with a curing agent metering pump.

3. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 2, characterized in that: In step S2, a cutting mechanism is used to cut the fiberglass cloth. The cutting mechanism includes a frame, a feed roller, a conveyor roller assembly, and a cutting assembly. The feed roller is set on the frame to hold the fiberglass cloth roll. The conveyor roller assembly is set on the frame and located next to the feed roller to convey the fiberglass cloth. The cutting assembly is set next to the conveyor roller assembly to cut the fiberglass cloth conveyed by the conveyor roller assembly to form fiberglass cloth of a set size.

4. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 3, characterized in that: The conveying roller assembly consists of at least two sets, which are spaced apart along the conveying direction of the fiberglass cloth. The set of conveying roller assemblies closest to the cutting assembly is equipped with a positioning sensor.

5. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 1, characterized in that: In step S3, the repair airbag is equipped with an air inlet and a pressure relief valve.

6. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 4, characterized in that: In step S3, a hardness sensor is provided at a set position on the outer surface of the repair airbag. The hardness sensor is used to obtain the hardness data of the repair resin liquid of the wet liner.

7. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 6, characterized in that: Step S4 also includes a control unit, which is electrically connected to the resin metering pump, the curing agent metering pump, the positioning sensor, and the hardness sensor, respectively.

8. The non-excavation repair method for point-based in-situ solidification of pipelines according to claim 1, characterized in that: In step S4, the set value is determined based on the standard curing curve of the target resin material.

9. The pipeline point-based in-situ solidification trenchless repair construction method according to claim 3, characterized in that: The cutting mechanism also includes a semi-finished product conveyor belt disposed on the frame and located at the discharge port of the cutting component.

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