Pipeline non-excavation repair process

Abstract

The invention relates to the technical field of trenchless repair processes, and discloses a pipeline trenchless repair process, which comprises the following steps of: 1, arranging a professional to carry a geological detector and a pipeline detection radar to carry out field investigation, and evaluating and checking the interior of a pipeline through a pipeline endoscope and a CCTV pipeline detection robot; 2, determining the length of a pipe section needing to be repaired according to a detection result; thirdly, after cleaning is completed, a pipeline grinding robot is used for grinding the inner wall of the pipeline; and 4, a CIPP in-situ curing method is adopted, and a lining pipe, a winch, a reducing machine, an ultraviolet curing lamp used for resin curing and a CCTV pipeline detection robot are prepared and used for detection and comparison of the pipeline conditions before and after repairing. By adopting the CIPP in-situ curing pipeline repair process, an aged or damaged pipeline system can be efficiently repaired, and large-scale excavation work is avoided, so that the influence on the environment and the interference on traffic are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of trenchless repair technology, and in particular to a trenchless repair technology for pipelines. Background Art

[0002] In the rapid development of modern cities, underground pipeline networks, as the "lifeline" of the city, shoulder many key functions such as water supply, drainage, gas transmission, and communication. Their stable operation plays a vital role in ensuring the normal operation of the city and the quality of life of residents. However, with the increase in the service life of pipelines and the continuous erosion of complex external environmental factors, pipeline aging, damage, corrosion and other problems are becoming more and more frequent, and efficient and reliable repair methods are urgently needed.

[0003] Most traditional pipeline repair processes rely on large-scale ground excavation operations. During the excavation process, dust is flying everywhere, and a large amount of fine particles are discharged into the air, causing the air quality in the surrounding area to deteriorate sharply, posing a serious threat to the respiratory health of residents and damaging the environment. At the same time, construction machinery roars day and night, and the high-intensity noise generated far exceeds the environmental noise standard.

[0004] In addition, the operating costs and manpower costs of excavation machinery are huge. At the same time, traditional repair methods mostly use simple and extensive repair materials and processes, such as simple welding and patch repairs on damaged parts of the pipeline. These repair methods seem to solve the problem in the short term, but in the long run, due to the poor corrosion and wear resistance of the repaired parts, new damage will soon appear under the long-term scouring and erosion of the medium in the pipeline. The pipeline needs frequent maintenance and its service life is greatly reduced.

[0005] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to a person of ordinary skill in the art. Summary of the invention

[0006] In order to solve the problem that most traditional pipeline repair processes rely on large-scale ground excavation operations, during which dust is flying all over the sky and a large amount of fine particles are discharged into the air, causing the air quality in the surrounding areas to deteriorate sharply, posing a serious threat to the respiratory health of residents and damaging the environment, the present invention provides a pipeline non-excavation repair process.

[0007] The present invention provides a pipeline trenchless repair process that adopts the following technical solution:

[0008] A trenchless pipeline repair process, step 1: First, arrange professionals to carry geological detectors and pipeline detection radars to conduct on-site field surveys. Accurately locate the locations of various underground pipelines and mark them on the ground to avoid damage to other pipelines during construction. Then use pipeline endoscopes and CCTV pipeline inspection robots to evaluate and inspect the inside of the pipeline.

[0009] Step 2: According to the test results, determine the length of the pipe section that needs to be repaired, clean and pre-treat the pipe to ensure that the inner wall of the pipe is clean and smooth, laying a good foundation for subsequent construction. Set up sewage collection devices at appropriate locations downstream of the pipeline, such as large sewage suction pumps, temporary sedimentation tanks, etc., to promptly suck out and precipitate the cleaned sewage and debris to avoid secondary pollution.

[0010] Step 3: After cleaning, use a pipe polishing robot to polish the inner wall of the pipe to make it smooth and improve the bonding effect between the repair material and the original pipe.

[0011] Step 4: Use the CIPP in-situ curing method to prepare the liner pipe (resin-impregnated fiber liner pipe), winch, reducer, ultraviolet curing lamp for resin curing, and CCTV pipeline inspection robot for inspection and comparison of the pipeline conditions before and after repair.

[0012] Step 5: Carry the pre-customized resin-impregnated fiber liner to the construction site, and set a liner guide pulley on the inner wall of the pipeline to facilitate the smooth entry of the liner into the pipeline. Use a winch to slowly pull the liner into the pipeline to be repaired. After the liner is in place, seal its port. Use a special rubber sealing ring to ensure that there will be no resin leakage during the resin curing process, and at the same time ensure that the liner is tightly connected to the original pipeline port, laying the foundation for subsequent overall curing.

[0013] Step 6: Use UV curing technology. After the liner is installed, slowly push the UV curing lamp along the inside of the pipe to ensure that the UV rays can evenly irradiate the resin on the liner to cure it. During the curing process, the temperature sensor and light intensity sensor are used to monitor the curing conditions in real time to ensure the curing quality.

[0014] Step 7: After the repair material is cured, use cutting equipment to cut off the excess part of the liner pipe port to make the repaired pipe port neat. Clean the excess resin, sewage and other residues in the pipe. Use CCTV equipment to inspect the pipe again to confirm the quality of the resin lining. And perform a pipeline pressure test to ensure that the pipeline is unobstructed.

[0015] Preferably, the assessment inspection in step 1 includes assessing the damage of the inner wall of the pipeline, cracks, deformation, corrosion and sediments. Determine the type and extent of damage to the pipeline based on the video image. Check whether there are large-scale ruptures, collapses or other serious problems.

[0016] Preferably, the cleaning and pretreatment of the pipeline in step 2 comprises the following steps:

[0017] Use a high-pressure water gun, usually with a water pressure of 200-300 bar, to flush out pollutants such as sand, grease, and sediment in the pipe;

[0018] For more stubborn deposits, use mechanical cleaning equipment to physically clean them using pipe brushes and cutters.

[0019] Preferably, the pipe polishing robot polishes the rust and protrusions on the inner wall at a speed of 100-150 revolutions per minute.

[0020] Preferably, the diameter of the lining pipe is set slightly smaller than the inner diameter of the original pipe, and the reduction ratio of the reduction machine is controlled between 5% and 10% according to the characteristics of the resin and the construction process requirements.

[0021] Preferably, the speed of the winch is controlled at 0.5-1 meter per minute to ensure that the liner pipe moves forward smoothly and is not scratched.

[0022] Preferably, the moving speed of the ultraviolet curing lamp is controlled at 0.2-0.4 meters per minute.

[0023] Preferably, the pipeline pressure test is performed by conducting a water pressure or air pressure test at 1.2-1.5 times the designed operating pressure of the pipeline, and the pressure change is continuously observed, with the pressure maintaining time being no less than 30 minutes.

[0024] In summary, the present invention includes the following beneficial technical effects:

[0025] This application adopts the CIPP in-situ curing pipeline repair process, which can efficiently repair aging or damaged pipeline systems and avoid large-scale excavation work, thereby reducing the impact on the environment and interference with traffic. Secondly, the CIPP process uses resin curing technology, which makes the repaired pipeline have higher corrosion resistance, compressive strength and service life, and improves the overall reliability and safety of the pipeline. In addition, the process has low construction costs and a short construction period, which can significantly reduce repair costs and reduce pipeline downtime, ensuring the normal operation of infrastructure such as water supply and drainage. The entire repair process does not require large-scale excavation of the ground, which greatly reduces the dust pollution caused by earthwork, avoids dust in the construction area affecting the surrounding air quality, and plays a good protective role in the urban atmospheric environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a working status diagram of the trenchless repair of pipeline in an embodiment of the invention. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 The present invention is described in further detail.

[0028] The embodiment of the present invention discloses a pipeline trenchless repair process. Figure 1 , Step 1: First, arrange professionals to carry geological detectors and pipeline detection radars to conduct on-site field surveys. Accurately locate the locations of various underground pipelines and mark them on the ground to avoid damage to other pipelines during construction. Then use pipeline endoscopes and CCTV pipeline inspection robots to evaluate and inspect the inside of the pipeline. These devices can travel inside the pipeline and take images of the inner wall of the pipeline, thereby accurately locating the damage location and degree of the pipeline (such as the length and width of the crack, the area of ​​corrosion, etc.) and the structural condition of the pipeline.

[0029] In this application, the assessment inspection in step 1 includes assessing the damage of the inner wall of the pipeline, cracks, deformation, corrosion and sediments. The type and extent of pipeline damage are determined based on the video images. Check whether there are large-scale ruptures, collapses or other serious problems. If the pipeline damage is too severe (such as complete rupture, collapse), the CIPP process may not be applicable.

[0030] Step 2: According to the test results, determine the length of the pipe section that needs to be repaired, clean and pre-treat the pipe to ensure that the inner wall of the pipe is clean and smooth, laying a good foundation for subsequent construction. Set up sewage collection devices at appropriate locations downstream of the pipeline, such as large sewage suction pumps, temporary sedimentation tanks, etc., to promptly suck out and precipitate the cleaned sewage and debris to avoid secondary pollution.

[0031] Among them, the cleaning and pretreatment of the pipeline includes the following steps:

[0032] Use a high-pressure water gun, usually with a water pressure of 200-300 bar, to flush out pollutants such as sand, grease, and sediment in the pipe;

[0033] For more stubborn deposits, use mechanical cleaning equipment to physically clean them with pipe brushes and cutters. Break up large pieces of deposits and then use high-pressure water jets to clean them to ensure that the inner wall of the pipe is basically clean.

[0034] Step 3: After cleaning, use a pipe grinding robot to grind the inner wall of the pipe to make it smooth and flat, and improve the bonding effect between the repair material and the original pipe. The pipe grinding robot grinds the rust and protrusions on the inner wall at a speed of 100-150 revolutions per minute.

[0035] In this application, for the parts with cracks and holes, small electric tools are used to expand and trim the holes, remove loose concrete, metal debris, etc., and ensure that the edges of the repaired parts are neat. Then, a special cleaning agent is used to clean the inner wall of the pipe to remove impurities such as oil, dust, etc. The cleaning agent is an environmentally friendly product that is non-corrosive to the pipe material and volatile. After cleaning, the inner wall of the pipe is dried with a hair dryer or natural ventilation to create good conditions for subsequent repair work.

[0036] Step 4: Use the CIPP in-situ curing method to prepare the liner pipe (resin-impregnated fiber liner pipe), winch, reducer, ultraviolet curing lamp for resin curing, and CCTV pipeline inspection robot for inspection and comparison of the pipeline conditions before and after repair.

[0037] In this application, the diameter of the lining pipe is set slightly smaller than the inner diameter of the original pipe, and the reduction ratio of the reducing machine is controlled between 5% and 10% according to the characteristics of the resin and the construction process requirements.

[0038] Step 5: Carry the pre-customized resin-impregnated fiber liner to the construction site, and set a liner guide pulley on the inner wall of the pipeline to facilitate the smooth entry of the liner into the pipeline. The liner is slowly pulled into the pipeline to be repaired by a winch. The speed of the winch is controlled at 0.5-1 meters per minute to ensure that the liner moves forward smoothly and is not scratched. After the liner is in place, its port is sealed. If the pipeline is long or has multiple branches, it needs to be constructed in sections, and each section is independently lined. Use a special rubber sealing ring to ensure that there will be no resin leakage during the resin curing process, and at the same time ensure that the liner is tightly connected to the original pipeline port, laying the foundation for subsequent overall curing. .

[0039] Step 6: Use the UV curing process. After the liner is installed, slowly push the UV curing lamp along the inside of the pipe. The moving speed of the UV curing lamp is controlled at 0.2-0.4 meters per minute. Ensure that the UV rays can evenly irradiate the resin on the liner to cure it. During the curing process, the curing conditions are monitored in real time through temperature sensors and light intensity sensors to ensure the curing quality. The resin lining material is hardened through the curing process to form a new pipe, restoring the structure and function of the original pipe.

[0040] Step 7: After the repair material is cured, use cutting equipment to cut off the excess part of the liner pipe port to make the repaired pipe port neat. Clean the excess resin, sewage and other residues in the pipe. Use CCTV equipment to inspect the pipe again to confirm the quality of the resin lining. And perform a pipeline pressure test to ensure that the pipeline is unobstructed. The pipeline pressure test is carried out according to 1.2-1.5 times the designed operating pressure of the pipeline. The pressure change is continuously observed and the pressure maintenance time is not less than 30 minutes.

[0041] The implementation principle of a trenchless pipeline repair process in an embodiment of the present invention is as follows: First, through field survey, accurately grasp the information of the pipeline and the surrounding environment, formulate an adaptive repair plan based on this, and prepare professional equipment and qualified materials. After the construction starts, the pipeline is desilted by combining high-pressure water jets and mechanical desilting tools to remove silt and debris on the inner wall, and then the inner wall is pre-treated with a grinding robot and a cleaning agent to create a flat, dry and clean surface that is conducive to repair;

[0042] The CIPP in-situ curing method is used to pull the reduced diameter resin-impregnated fiber-lined pipe into the pipeline, and the speed and air pressure are precisely controlled to ensure that it is in place and the port is sealed; then, the repair material is cured according to the selected process and cured by ultraviolet light to form a stable structure of the repair material;

[0043] After curing is completed, the excess parts of the lining pipe are cut and trimmed, CCTV is used to review the local repair effect, and a pressure test with the design pressure multiple is carried out to verify the overall repair quality. The entire process does not require large-scale excavation of the ground. Relying on detection, fine operation, and adaptation of materials and processes, efficient repairs of underground pipeline damage, aging, and other problems can be achieved, and the pipeline's water and gas transmission functions and structural strength can be restored.

[0044] Finally, a few points should be explained: First, in the description of the present invention, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0045] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0046] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0047] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipeline trenchless repair process, characterized in that: The steps include: Step 1: First, arrange professionals to carry geological detectors and pipeline detection radars to conduct on-site field surveys, and then use pipeline endoscopes and CCTV pipeline inspection robots to evaluate and inspect the inside of the pipeline; Step 2: According to the test results, determine the length of the pipe section that needs to be repaired, clean and pre-treat the pipe to ensure that the inner wall of the pipe is clean and smooth; Step 3: After cleaning, use a pipe polishing robot to polish the inner wall of the pipe to improve the bonding effect between the repair material and the original pipe; Step 4: Use CIPP in-situ curing method to prepare the liner pipe, winch, reducer, UV curing lamp for resin curing, and CCTV pipeline inspection robot for inspection and comparison of pipeline conditions before and after repair; Step 5: transport the pre-customized resin-impregnated fiber liner to the construction site, set a liner guide pulley on the inner wall of the pipeline, and slowly pull the liner into the pipeline to be repaired by a winch. After the liner is in place, seal its port; Step 6: Using the UV curing process, after the liner pipe is installed, slowly push the UV curing lamp along the inside of the pipe for curing; Step 7: After the repair material has solidified, use cutting equipment to cut off the excess part of the liner pipe port, use CCTV equipment to conduct an internal inspection of the pipeline again to confirm the quality of the resin lining, and perform a pipeline pressure test to ensure that the pipeline is unobstructed.

2. A pipeline trenchless repair process according to claim 1, characterized in that: The assessment inspection in step one includes assessing the damage, cracks, deformation, corrosion and deposits on the inner wall of the pipeline.

3. The trenchless pipeline repair process according to claim 1 is characterized in that: The cleaning and pretreatment of the pipeline in step 2 includes the following steps: Use a high-pressure water gun, usually with a water pressure of 200-300 bar, to flush out pollutants such as sand, grease, and sediment in the pipe; For more stubborn deposits, use mechanical cleaning equipment to physically clean them using pipe brushes and cutters.

4. The trenchless pipeline repair process according to claim 1 is characterized in that: The pipeline polishing robot polishes the rust and protrusions on the inner wall at a speed of 100-150 revolutions per minute.

5. The trenchless pipeline repair process according to claim 1, characterized in that: The diameter of the inner lining pipe is set slightly smaller than the inner diameter of the original pipe, and the reduction ratio of the reduction machine is controlled between 5% and 10% according to the characteristics of the resin and the construction process requirements.

6. The trenchless pipeline repair process according to claim 1, characterized in that: The speed of the winch is controlled at 0.5-1 meter per minute to ensure that the liner pipe moves forward smoothly and is not scratched.

7. The trenchless pipeline repair process according to claim 1, characterized in that: The moving speed of the ultraviolet curing lamp is controlled at 0.2-0.4 meters per minute.

8. The trenchless pipeline repair process according to claim 1, characterized in that: The pipeline pressure test is carried out by conducting water pressure and air pressure tests at 1.2-1.5 times the designed operating pressure of the pipeline, continuously observing the pressure changes, and maintaining the pressure for no less than 30 minutes.

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