Non-excavation ultraviolet curing repair construction method for municipal old pipe network

Abstract

The invention relates to the technical field of municipal old pipe network repair, and aims to solve the problems that a traditional excavation repair method is long in construction period and affects traffic and environment, and an existing ultraviolet light curing repair technology is not fine in process step and inaccurate in parameter control. The background technology shows that the municipal old pipe network maintenance demand is urgent in the urbanization process, the trenchless repair technology is concerned due to the fact that large-scale excavation is not needed, and the ultraviolet light curing repair technology is rapid in repair and reliable in quality, but the steps of pipeline pretreatment, material preparation and the like are lack of standardized processes. And improper control of key parameters such as curing temperature and time easily affects the performance of the lining pipe. On the basis, according to the non-excavation ultraviolet light curing repair construction method for the municipal old pipe network, through refined steps and strict parameter control, the repair effect and efficiency are improved, the influence on normal operation of a city is reduced, and an optimization scheme is provided for pipe network maintenance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of pipe network repair, in particular to a municipal old pipe network non-excavation ultraviolet light curing repair construction method. BACKGROUND

[0002] In the current process of urbanization, the maintenance and repair of municipal old pipe networks are becoming increasingly important. Traditional excavation repair methods require large-scale excavation of the road surface during construction, which not only prolongs the construction period, but also causes serious traffic congestion in the city. In view of this, non-excavation repair technology has emerged and received widespread attention. This kind of technology does not require large-scale excavation of the road surface, but only needs to use a small number of working wells to repair the underground pipe network, which can significantly reduce the adverse effects on urban traffic and the environment. Among many non-excavation repair technologies, ultraviolet light curing repair technology stands out due to its own advantages. It has fast repair speed, can greatly shorten the construction time, and has reliable repair quality. The cured inner lining pipe has high strength and corrosion resistance, which can effectively prolong the service life of the pipe. However, the current ultraviolet light curing repair technology still has room for improvement in practical application. The process steps are not fine enough, and there is a lack of standardized and fine operation procedures in the aspects of pipe pretreatment and repair material preparation, which can easily affect the final repair effect. The parameter control is not accurate enough, such as the key parameters of temperature, time, ultraviolet light irradiation intensity and speed during the curing process. If not properly controlled, it can lead to insufficient or excessive curing of the resin, reducing the performance of the inner lining pipe. SUMMARY

[0003] The technical problem to be solved by the present application is that the current ultraviolet light curing repair pipe is relatively rough, and there is a lack of fine control of each construction process.

[0004] The present application provides a municipal old pipe network non-excavation ultraviolet light curing repair construction method, comprising the following steps: Step one, preliminary investigation and data collection: before construction, use high-precision underground pipeline detection equipment to conduct comprehensive investigation on the area where the old pipe network is located; Step two, pipe detection and evaluation: use advanced pipe detection equipment to comprehensively detect the inside of the old pipe network that needs to be repaired; Step three, pipe pretreatment: according to the pipe detection result, pretreat the pipe that needs to be repaired; for the silt, debris and other blockages in the pipe, use a high-pressure water jet cleaning device to clean them; Step 4: Preparation of Repair Materials: Select suitable UV-curable repair materials, including resin, curing agent, reinforcing material, and inner lining tube; the resin should be epoxy resin or unsaturated polyester resin, with a viscosity controlled between 500-1000 mPa·s, a tensile strength of not less than 50 MPa after curing, and an elongation at break of not less than 10%; mix and impregnate the resin, curing agent, and reinforcing material according to the design requirements, so that the reinforcing material fully absorbs the resin to form an inner lining material with certain strength and flexibility; Step 5: Pulling in and positioning the inner liner: Connect one end of the prepared inner liner to the winch's traction rope, and seal the other end; set up a guide device at the pipe inlet to ensure that the inner liner can smoothly enter the pipe. Step Six: UV Curing: Install UV curing equipment inside the pipeline, including UV lamp assembly and control system; during the curing process, control the temperature inside the pipeline at 50-80℃, the temperature is monitored in real time by a temperature sensor and adjusted by a heating device; the curing time is determined according to the type and thickness of the resin, generally 30-60 minutes; during the curing process, the UV lamp assembly rotates inside the pipeline at a speed of 5-10 revolutions per minute to ensure that all parts of the inner lining tube are evenly irradiated with UV light, ensuring that the resin is fully cured; Step 7, Cooling and Curing Post-treatment: After curing, turn off the UV curing equipment and allow the pipeline to cool naturally or by force. Step 8, Quality Inspection and Acceptance: Conduct quality inspection on the repaired pipeline, including visual inspection, thickness measurement, strength testing, and sealing performance testing; Step 9, Pipeline endoscopic re-inspection: Use a CCTV pipeline inspection robot to re-enter the repaired pipeline and conduct a detailed endoscopic inspection of the repaired area; Step 10: Data Organization and Archiving: Organize and summarize the survey data, test reports, construction records, and quality test results throughout the construction process to establish a complete project archive.

[0005] Preferably, the underground pipeline detection equipment in step one includes, but is not limited to, three-dimensional ground-penetrating radar and pipeline detectors; it detects the distribution, direction, burial depth of underground pipelines and their positional relationship with surrounding structures, and records basic information such as the material, diameter, and length of the pipeline network; at the same time, through on-site surveys, it understands the geological conditions of the area, including soil type, moisture content, groundwater level, as well as surrounding traffic flow, building distribution, and other environmental factors; it organizes and analyzes the data obtained from the survey to establish a detailed pipeline network file, providing an accurate basis for the subsequent remediation plan design.

[0006] Preferably, the pipeline inspection equipment in step two includes a CCTV pipeline inspection robot; the inspection content includes the pipeline damage condition, such as the location, size, and severity of cracks, corrosion, leaks, and disconnections; the scale and sludge accumulation blockage on the inner wall of the pipeline; and the pipeline deformation condition, such as ellipticity and local depressions; during the inspection process, the travel speed of the inspection robot is controlled at 0.5-1.0 meters / minute to ensure the clarity and accuracy of the inspection images; the inspection data is analyzed using professional evaluation software to assess the structural integrity and operational status of the pipeline, determine the necessity of repair and the specific requirements of the repair plan, such as the pipeline section to be repaired, the repair thickness, and the strength requirements.

[0007] Preferably, in step three, the pressure of the high-pressure water jet is controlled at 15-30 MPa, and the flow rate is 50-100 liters / minute. During cleaning, the cleaning nozzle moves back and forth inside the pipe at a speed of 20-30 rpm to ensure that the dirt and blockages on the inner wall of the pipe are thoroughly removed. For scale and rust on the inner wall of the pipe, mechanical grinding equipment is used for grinding. The grinding tool speed is 100-200 rpm, and the grinding pressure is 0.5-1.0 MPa, so that the surface roughness of the inner wall of the pipe reaches Ra3.2-6.3 μm, so as to enhance the adhesion between the subsequent lining and the inner wall of the pipe. After the pretreatment is completed, the pipe is inspected a second time to ensure that the inner wall of the pipe is clean and free of debris, creating good conditions for the construction of the lining.

[0008] Preferably, in step four, the curing agent is selected according to the type of resin. For example, for epoxy resin, an amine curing agent can be used. The mass ratio of curing agent to resin is 1:10-1:5. The ratio is made by precise metering equipment to ensure uniform mixing. The reinforcing material is made of glass fiber cloth or carbon fiber cloth, with a unit area mass of 300-600g / m2 and a thickness of 0.2-0.5mm. The inner lining tube is customized according to the pipe diameter and length. The diameter of the inner lining tube is 10-20mm smaller than the inner diameter of the pipe to ensure that it can be smoothly pulled into the pipe.

[0009] Preferably, in step five, the winch is started to pull the inner liner into the pipe at a speed of 0.3-0.5 meters per minute. During the traction process, the traction force is monitored in real time and controlled within the range of 5-10 kN to avoid damage to the inner liner due to excessive force. After the inner liner is pulled into the predetermined position, it is precisely positioned by a positioning device to ensure that the interface position between the inner liner and the two ends of the pipe is accurate with an error of no more than 5 mm. After positioning, both ends of the pipe are sealed to prevent resin leakage during the curing process.

[0010] Preferably, in step six, the wavelength of the ultraviolet lamp group is 365-405nm and the power is 10-20kW. The number and spacing of the ultraviolet lamp groups are adjusted according to the pipe diameter and the thickness of the inner lining tube to ensure that the ultraviolet light can be evenly irradiated on the entire inner surface of the inner lining tube.

[0011] Preferably, during natural cooling in step seven, the ambient temperature is controlled at 20-30℃, and the cooling time is 2-4 hours; during forced cooling, an air compressor is used to introduce cooling air into the pipe at a flow rate of 10-20 cubic meters per minute, a cooling temperature of 10-20℃, and a cooling time of 1-2 hours; after cooling, the sealing devices at both ends of the pipe are removed, and the excess lining material at both ends of the pipe is cut and trimmed to make the interface between the lining tube and the pipe ends flat and sealed; at the same time, the inside of the pipe is cleaned to remove debris and impurities generated during the curing process.

[0012] Preferably, in step eight, the visual inspection observes whether the surface of the inner lining tube is flat, free of cracks, and free of air bubbles; the thickness is measured using an ultrasonic thickness gauge at different locations on the pipeline, with the thickness deviation not exceeding ±5% of the design thickness; the strength is tested using a hydrostatic test or a pneumatic test, with the hydrostatic test pressure being 1.5 times the pipeline's working pressure and the pressure holding time being 30 minutes, and the pneumatic test pressure being 0.3-0.5 MPa and the pressure holding time being 15 minutes, to ensure that the pipeline is leak-free; the sealing is tested using a smoke detector or a gas leak detector to detect whether there is any leakage in the pipeline; after the tests are completed, the test data is compiled, a quality inspection report is written, and acceptance is carried out according to relevant standards and specifications to ensure that the repaired pipeline meets the usage requirements.

[0013] Preferably, in step nine, the surface flatness of the inner lining tube, its fit with the original pipe, and the presence of uncured areas, bubbles, wrinkles, or other defects are checked; the images and data of the re-examination are recorded and compared with the test results before repair to evaluate the repair effect; if minor defects such as small bubbles or local unevenness are found, local repair measures can be taken; if serious defects such as large areas of uncured material or cracks are found, the repair process needs to be repeated. The data in step ten includes text documents, image data, and video data, which are archived and saved in accordance with the prescribed formats and requirements; this provides detailed reference for subsequent pipeline maintenance and management, and also provides experience for similar projects.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention, through refined process steps and strict parameter control, ensures the efficient application of ultraviolet curing repair technology in the repair of old municipal pipeline networks, improving repair quality and efficiency. The trenchless repair method effectively avoids the impact of traditional trenching repair methods on urban traffic and the environment, reduces construction time, and lowers repair costs. The construction method of this invention employs advanced pipeline inspection technology and quality control methods, enabling accurate assessment of pipeline conditions and ensuring the targetedness and effectiveness of the repair plan. Data compilation and archiving provide detailed reference for subsequent pipeline maintenance and management, and also offer valuable experience for similar projects, promoting the continuous progress and development of municipal pipeline network repair technology. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a process flow diagram for the construction of an embodiment of the present invention. Detailed Implementation

[0016] like Figure 1 As shown, this invention provides a trenchless ultraviolet curing repair method for municipal old pipelines, comprising the following steps: Step 1: Preliminary Survey and Data Collection: Before construction, a comprehensive survey of the area where the old pipeline network is located will be conducted using high-precision underground pipeline detection equipment. This equipment includes, but is not limited to, 3D ground-penetrating radar and pipeline detectors. The survey will detect the distribution, direction, burial depth of underground pipelines, and their positional relationship with surrounding structures, recording basic information such as the pipeline material, diameter, and length. Simultaneously, through on-site investigation, the geological conditions of the area will be understood, including soil type, moisture content, groundwater level, as well as surrounding traffic flow and building distribution environmental factors. The survey data will be organized and analyzed to establish a detailed pipeline network file, providing an accurate basis for subsequent remediation plan design. Step Two: Pipeline Inspection and Assessment: Advanced pipeline inspection equipment is used to conduct a comprehensive inspection of the interior of the old pipeline network requiring repair. This equipment includes a CCTV pipeline inspection robot. The inspection includes assessing the pipeline's damage, such as the location, size, and severity of cracks, corrosion, leaks, and disconnections; the presence of scale and sludge buildup on the inner walls; and the pipeline's deformation, such as ellipticity and localized dents. During the inspection, the robot's travel speed is controlled at 0.5-1.0 meters per minute to ensure clear and accurate images. The inspection data is analyzed using professional assessment software to evaluate the pipeline's structural integrity and operational status, determining the necessity of repair and the specific requirements of the repair plan, such as the pipeline sections requiring repair, the required repair thickness, and strength. Step 3: Pipeline Pre-treatment: Based on the pipeline inspection results, pre-treatment is performed on the pipelines requiring repair. For silt, debris, and blockages within the pipeline, high-pressure water jet cleaning equipment is used. The pressure of the high-pressure water jet is controlled at 15-30 MPa, and the flow rate is 50-100 liters / minute. During cleaning, the cleaning nozzle moves back and forth within the pipeline at a speed of 20-30 rpm to ensure thorough removal of dirt and blockages from the inner wall of the pipeline. For scale and rust on the inner wall of the pipeline, mechanical grinding equipment is used for grinding. The grinding tool's speed is 100-200 rpm, and the grinding pressure is 0.5-1.0 MPa, achieving a surface roughness of Ra3.2-6.3 μm on the inner wall of the pipeline to enhance the adhesion between the subsequent lining and the inner wall of the pipeline. After pre-treatment, a second inspection of the pipeline is conducted to ensure that the inner wall of the pipeline is clean and free of debris, creating favorable conditions for the construction of the lining. Step 4: Repair Material Preparation: Select suitable UV-curable repair materials, including resin, hardener, reinforcing material, and inner lining tube. The resin should be epoxy resin or unsaturated polyester resin, with a viscosity controlled between 500-1000 mPa·s. The tensile strength after curing should be no less than 50 MPa, and the elongation at break should be no less than 10%. Mix and impregnate the resin, hardener, and reinforcing material according to design requirements, ensuring the reinforcing material fully absorbs the resin to form an inner lining material with sufficient strength and flexibility. Select the appropriate hardener based on the type of resin. For example, for epoxy resin, an amine hardener can be used. The mass ratio of hardener to resin is 1:10-1:5, and precise metering should be used to ensure uniform mixing. The reinforcing material should be glass fiber cloth or carbon fiber cloth, with a unit area mass of 300-600 g / m² and a thickness of 0.2-0.5 mm. The inner lining tube should be customized according to the pipe diameter and length, with a diameter 10-20 mm smaller than the pipe's inner diameter to ensure smooth insertion into the pipe. Step 5: Pulling in and Positioning the Liner Tube: Connect one end of the prepared liner tube to the winch's traction rope, and seal the other end. Install a guide device at the pipe inlet to ensure the liner tube can smoothly enter the pipe. Start the winch and pull the liner tube into the pipe at a speed of 0.3-0.5 meters per minute. During the pulling process, monitor the traction force in real time, controlling it within the range of 5-10 kN to avoid damage to the liner tube due to excessive force. Once the liner tube is pulled into the predetermined position, use the positioning device to precisely position it, ensuring accurate interface positioning between the liner tube and both ends of the pipe, with an error not exceeding 5 mm. After positioning, seal both ends of the pipe to prevent resin leakage during the curing process. Step Six: UV Curing: Install UV curing equipment inside the pipeline, including UV lamps and a control system. During curing, control the temperature inside the pipeline between 50-80℃. The temperature is monitored in real time by a temperature sensor and adjusted by a heating device. The curing time is determined according to the type and thickness of the resin, generally 30-60 minutes. During curing, the UV lamps rotate inside the pipeline at a speed of 5-10 revolutions per minute to ensure that all parts of the liner tube are evenly irradiated with UV light, ensuring that the resin is fully cured. The wavelength of the UV lamps is 365-405nm, and the power is 10-20kW. Adjust the number and spacing of the UV lamps according to the pipe diameter and the thickness of the liner tube to ensure that the UV light can evenly irradiate the entire inner surface of the liner tube. Step 7: Cooling and Curing Post-treatment: After curing, turn off the UV curing equipment and allow the pipeline to cool naturally or by force. For natural cooling, maintain the ambient temperature at 20-30℃ and allow 2-4 hours of cooling. For forced cooling, use an air compressor to introduce cooling air into the pipeline at a flow rate of 10-20 cubic meters per minute, maintaining a cooling temperature of 10-20℃ and allowing 1-2 hours of cooling. After cooling, remove the sealing devices at both ends of the pipeline, cut and trim any excess lining material at both ends to ensure a smooth and sealed interface between the lining tube and the pipeline ends. Simultaneously, clean the inside of the pipeline to remove debris and impurities generated during the curing process. Step 8: Quality Inspection and Acceptance: The repaired pipeline undergoes quality inspection, including visual inspection, thickness measurement, strength testing, and sealing testing. Visual inspection involves observing whether the inner lining surface is smooth, free of cracks, and free of air bubbles. Thickness measurement uses an ultrasonic thickness gauge to measure the thickness of the inner lining at different locations on the pipeline; the thickness deviation should not exceed ±5% of the design thickness. Strength testing employs either a hydrostatic test or a pneumatic test. The hydrostatic test pressure is 1.5 times the pipeline's working pressure, with a holding time of 30 minutes; the pneumatic test pressure is 0.3-0.5 MPa, with a holding time of 15 minutes, ensuring no leaks. Sealing testing uses a smoke detector or gas leak detector to check for leaks. After inspection, the data is compiled, a quality inspection report is prepared, and acceptance is conducted according to relevant standards and specifications to ensure the repaired pipeline meets usage requirements. Step Nine, Pipeline Internal Inspection: Using a CCTV pipeline inspection robot, re-enter the repaired pipeline to conduct a detailed endoscopic inspection of the repaired area; check the surface flatness of the liner, its fit with the original pipeline, and whether there are any uncured areas, bubbles, or wrinkles; record the inspection images and data, compare them with the inspection results before repair, and evaluate the repair effect; if minor defects are found, such as small bubbles or local unevenness, local repair measures can be taken; if serious defects are found, such as large areas of uncured material or cracks, the repair process needs to be repeated. Step 10: Data Compilation and Archiving: Compile and summarize the survey data, test reports, construction records, and quality test results from the entire construction process to establish a complete project archive. The data includes text documents, image data, and video data, which are archived and preserved in accordance with the prescribed formats and requirements. This provides detailed reference for subsequent pipeline maintenance and management, and also provides experience for similar projects.

[0017] Example 1: Project Overview A 50-meter section of DN300 concrete pipe in a municipal drainage network was found to have multiple cracks and slight corrosion on its inner wall, requiring repair.

[0018] Construction steps Preliminary investigation and data collection: Using 3D ground-penetrating radar and pipeline detectors, the burial depth of the pipeline was determined to be 2.5 meters. There were no important structures in the vicinity, the geological conditions were silty clay, and the groundwater level was low.

[0019] Pipeline inspection and assessment: A CCTV inspection robot was used with a travel speed of 0.6 meters per minute. The inspection revealed that the cracks were mainly distributed at the bottom and sides of the pipeline, with a crack width of 0.5-1.0 mm. The corrosion area accounted for about 10% of the inner wall of the pipeline. The assessment indicated that the inner lining repair was required, and the designed inner lining thickness was 3 mm.

[0020] Pipeline pretreatment: High-pressure water jet cleaning is used at a pressure of 20MPa, a flow rate of 80 liters / minute, and a nozzle speed of 25 rpm to remove silt and debris from the pipeline; then, mechanical grinding equipment is used to grind the pipeline at a speed of 150 rpm and a pressure of 0.8MPa to achieve an inner wall roughness of Ra5.0μm.

[0021] Repair material preparation: Epoxy resin with a viscosity of 800 mPa·s is selected, the curing agent is an amine curing agent with a ratio of 1:8 (mass ratio), the reinforcing material is glass fiber cloth with a unit area mass of 400 g / m2 and a thickness of 0.3 mm, the inner lining tube has a diameter of 280 mm and a length of 51 meters.

[0022] Inner liner tube insertion and positioning: winch traction speed 0.4 m / min, traction force 7 kN, positioning error after insertion 3 mm, both ends sealed.

[0023] UV curing: UV lamps with a wavelength of 365nm, a power of 15kW, 3 sets installed, spaced 10 meters apart, the temperature inside the pipe controlled at 60℃, the curing time is 45 minutes, and the lamp set rotation speed is 8 revolutions / minute.

[0024] Cooling and curing post-treatment: Natural cooling is used, with an ambient temperature of 25℃ and a cooling time of 3 hours. Excess material at both ends is cut and trimmed.

[0025] Quality inspection and acceptance: No defects were found in the appearance; the average thickness measured by ultrasonic testing was 3.1 mm; the water pressure test pressure was 0.6 MPa (working pressure 0.4 MPa); there was no leakage after holding the pressure for 30 minutes; the acceptance was qualified.

[0026] Pipeline endoscopic re-inspection: The inspection robot showed that the inner liner was well-fitted, the surface was smooth, and there were no obvious defects.

[0027] Data organization and archiving: Organize all construction data and archive them.

[0028] Example 2: Project Overview A section of DN600 steel pipe, 80 meters long, in a municipal gas pipeline was found to have corrosion pits on its inner wall, with localized thinning of the wall thickness, requiring repair.

[0029] Construction steps Preliminary investigation and data collection: The pipeline was determined to be buried at a depth of 3.0 meters. There are main traffic roads nearby. The geological conditions are sandy soil and the groundwater level is relatively high.

[0030] Pipeline inspection and assessment: The CCTV inspection robot travels at a speed of 0.5 meters per minute and found corrosion pits with a depth of 20% of the pipe wall thickness. The pits are relatively scattered, and the assessment indicates that internal lining repair is required. The designed internal lining thickness is 5 mm.

[0031] Pipeline pretreatment: High-pressure water jet pressure 25MPa, flow rate 100 liters / minute, cleaning nozzle speed 30 rpm, to remove rust and debris from the pipeline; mechanical grinding speed 200 rpm, pressure 1.0MPa, inner wall roughness Ra3.2μm.

[0032] Repair material preparation: Unsaturated polyester resin with a viscosity of 900 mPa·s and a curing agent ratio of 1:6 (by mass) is selected. The reinforcing material is carbon fiber cloth with a unit area mass of 600 g / m2 and a thickness of 0.5 mm. The inner lining tube has a diameter of 580 mm and a length of 81 meters.

[0033] Inner liner tube insertion and positioning: winch traction speed 0.3 m / min, traction force 10 kN, positioning error 4 mm, both ends sealed.

[0034] UV curing: UV lamp group wavelength 405nm, power 20kW, 5 groups installed, spacing 15 meters, pipe temperature 70℃, curing time 60 minutes, lamp group rotation speed 10 revolutions / minute.

[0035] Cooling and curing post-treatment: Forced cooling, with a cooling air flow rate of 20 cubic meters per minute, a temperature of 15°C, and a cooling time of 1.5 hours, followed by trimming of the joints at both ends.

[0036] Quality inspection and acceptance: No defects in appearance, average thickness of 5.1mm, air pressure test pressure of 0.5MPa, no leakage after 15 minutes of pressure holding, acceptance qualified.

[0037] Pipeline endoscopic re-inspection: The inspection showed that the inner liner was tightly fitted to the original pipeline, and the corrosion pit area was effectively covered.

[0038] Data organization and archiving: Organize construction data and complete archiving.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A trenchless ultraviolet curing repair method for municipal old pipelines, characterized in that, Includes the following steps: Step 1: Preliminary survey and data collection. Before construction, use high-precision underground pipeline detection equipment to conduct a comprehensive survey of the area where the old pipeline network is located. Step 2: Pipeline inspection and evaluation. Advanced pipeline inspection equipment is used to conduct a comprehensive inspection of the interior of the old pipeline network that needs to be repaired. Step 3: Pipeline pretreatment. Based on the pipeline inspection results, pretreatment is carried out on the pipelines that need to be repaired. For silt, debris and blockages in the pipeline, high-pressure water jet cleaning equipment is used for cleaning. Step 4: Prepare the repair materials by mixing and impregnating the resin, hardener, and reinforcing material, allowing the reinforcing material to fully absorb the resin and form the lining material. Step 5: Install and position the inner liner. Connect one end of the prepared inner liner to the traction rope of the winch, and seal the other end. Set up a guide device at the inlet of the pipe to ensure that the inner liner can enter the pipe smoothly. Step 6: UV scratching. Install UV curing equipment inside the pipe, including UV lamp assembly and control system. The control system includes a temperature sensor to control the internal temperature of the pipe. During the curing process, control the UV lamp assembly to rotate inside the pipe at a speed of 5-10 revolutions per minute so that the inner lining pipe receives UV irradiation evenly. Step 7: Cooling and Curing Post-treatment. After curing, turn off the UV curing equipment and allow the pipeline to cool naturally or be forced to cool by a fan. Step 8: Quality Inspection and Acceptance. Conduct quality inspections on the repaired pipeline, including visual inspection, thickness testing, strength testing, and sealing testing. Step 9: Re-inspection of the pipeline. Use a CCTV pipeline inspection robot to re-enter the repaired pipeline and conduct a detailed endoscopic inspection of the repaired area. Step 10: Data organization and archiving. Organize and summarize the survey data, test reports, construction records, and quality test results throughout the construction process to establish a complete project archive.

2. The method for trenchless ultraviolet curing repair of municipal old pipelines as described in claim 1, characterized in that: In step one, the underground pipeline detection equipment includes a three-dimensional ground-penetrating radar and a pipeline detector to detect the distribution, direction, burial depth, and positional relationship of underground pipelines with surrounding structures. It records the material, diameter, and length of the pipeline network. At the same time, through on-site investigation of the geological conditions of the area, including soil type, water content, groundwater level, and surrounding traffic flow and building distribution environmental factors, the data obtained are sorted and analyzed to establish a detailed pipeline network file.

3. The method for trenchless ultraviolet curing repair of municipal old pipelines as described in claim 1, characterized in that: In step two, the pipeline inspection equipment includes a CCTV pipeline inspection robot, and the inspection content includes the pipeline's breakage, the structure of the pipeline's inner wall, the accumulation and blockage of silt, and the deformation of the pipeline. During the inspection process, the travel speed of the inspection robot is controlled at 0.5-1.0 m / min to ensure the clarity and accuracy of the inspection images. The inspection data is analyzed by software to assess the structural integrity and operational status of the pipeline, and to determine the necessity of repair and the specific requirements of the repair plan.

4. The method for trenchless ultraviolet curing repair of municipal old pipelines as described in claim 1, characterized in that: In step three, the pressure of the high-pressure water jet is controlled at 15-30 MPa, and the flow rate is 50-100 liters / minute. During cleaning, the cleaning nozzle moves back and forth inside the pipe at a speed of 20-30 rpm to ensure that the dirt and blockages on the inner wall of the pipe are thoroughly removed. For scale and rust on the inner wall of the pipe, mechanical grinding equipment is used for grinding. The grinding tool speed is 100-200 rpm, and the grinding pressure is 0.5-1.0 MPa, so that the surface roughness of the inner wall of the pipe reaches Ra3.2-6.3 μm. After the pretreatment is completed, the pipe is inspected a second time to ensure that the inner wall of the pipe is clean and free of debris, creating good conditions for the construction of the lining.

5. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step four, the resin used is epoxy resin or unsaturated polyester resin, with a viscosity controlled at 500-1000 mPa·s, a tensile strength of not less than 50 MPa after curing, and an elongation at break of not less than 10%. The reinforcing material is glass fiber cloth or carbon fiber cloth, with a unit area mass of 300-600 g / ㎡ and a thickness of 0.2-0.5 mm. The inner lining tube is customized according to the pipe diameter and length, and the outer diameter of the inner lining tube is 10-20 mm smaller than the inner diameter of the pipe.

6. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step five, the winch is started to pull the inner liner into the pipe at a speed of 0.3-0.5 m / min. During the traction process, the traction force is monitored in real time and controlled within the range of 5-10 kN to avoid damage to the inner liner due to excessive force. After the inner liner is pulled into the predetermined position, it is precisely positioned by the positioning device to ensure that the interface position between the inner liner and the two ends of the pipe is accurate with an error of no more than 5 mm. After positioning, the two ends of the pipe are sealed to prevent resin leakage during the curing process.

7. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step six, the wavelength of the ultraviolet lamp beads is 365-405nm and the power is 10-20kW. The number and spacing of the ultraviolet lamp groups are adjusted according to the pipe diameter and the thickness of the inner lining tube to ensure that the ultraviolet light can be evenly distributed on the entire inner surface of the inner lining tube.

8. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 7, characterized in that: In step six, during the curing process, the temperature inside the pipe is controlled at 50-80℃ using a temperature sensor and control system. The temperature is monitored in real time using the temperature sensor, and the curing time is controlled at 30-60 minutes.

9. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step seven, during natural cooling, the ambient temperature is controlled at 20-30℃ and the cooling time is 2-4 hours. During forced cooling, an air compressor is used to introduce cooling air into the pipe at a flow rate of 10-20 m³ / min, a cooling temperature of 10-20℃, and a cooling time of 1-2 hours. After cooling is completed, the sealing devices at both ends of the pipe are removed, and the excess lining material at both ends of the pipe is cut and trimmed to make the interface between the lining tube and the pipe ends flat and sealed. At the same time, the inside of the pipe is cleaned to remove debris and impurities generated during the curing process.

10. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step eight, the visual inspection of the inner liner includes checking the surface flatness, cracks, and bubbles. The thickness of the inner liner is measured using an ultrasonic thickness gauge to ensure that the thickness deviation does not exceed ±5% of the design thickness. The pressure holding time is 30 minutes. The pressure test pressure is 0.3-0.5 MPa, and the pressure holding time is 15 minutes to ensure that the pipeline is leak-free. The sealing test uses a smoke detector or gas leak detector to detect whether there is any leakage in the pipeline. After the test is completed, the test data is compiled and a quality inspection report is written.

11. The method for trenchless ultraviolet curing repair of municipal old pipelines according to claim 1, characterized in that: In step nine, the re-inspection includes checking the surface flatness of the inner liner, the degree of fit with the original pipe, and whether there are uncured areas, bubbles, wrinkles, or other defects; recording the re-inspection images and data, comparing them with the inspection results before repair, evaluating the repair effect, and if minor defects are found, making local repairs to the defective areas; if serious defects are found, repairing the pipe again.

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