“CIPP UV UV curing non-excavation repair technology (also often referred to as UV-curing pipeline trenchless repair technology, drag-in CIPP pipeline trenchless repair technology) refers to the use of mechanical traction to impregnate the felt with photosensitive resin The hose is dragged into the pipeline to be repaired, compressed air is injected to make it close to the inner wall of the pipeline, and the resin is cured inside the pipeline through ultraviolet light irradiation to form a high-strength resin-lined new pipe lining repair technology for the entire section of the pipeline.
CIPP UV UV curing non-excavation repair technology (also often referred to as UV-curing pipeline trenchless repair technology, drag-in CIPP pipeline trenchless repair technology) refers to the use of mechanical traction to impregnate the felt with photosensitive resin The hose is dragged into the pipeline to be repaired, compressed air is injected to make it close to the inner wall of the pipeline, and the resin is cured inside the pipeline through ultraviolet light irradiation to form a high-strength resin-lined new pipe lining repair technology for the entire section of the pipeline.
Lande CIPP UV curing site construction: Construction flow chart:
2. Preliminary preparation:
1) Construction preparation
a) Traffic maintenance shall temporarily occupy roads in accordance with the approval of the traffic management department and the road management department. Set up temporary traffic guidance signs, set up roadblocks, and isolate facilities. Set up a full-time traffic evacuation staff to conduct traffic guidance.
b) Construction technical and safety technical clarification: The former refers to the technical confession made by the technical person in charge of the construction team to the personnel involved in the construction before construction. The purpose is to enable the construction personnel to understand the characteristics of the project, technical quality requirements, construction methods and measures Have a detailed understanding of safety and safety in order to organize the construction scientifically and avoid accidents such as technical quality. The latter refers to the training of the safety operation procedures and precautions of the operation conducted by the safety personnel of the construction team to the personnel participating in the construction before the construction, the purpose of which is to improve the safety awareness of the construction personnel and avoid accidents causing personal safety injuries. The main content includes the wearing of labor protection supplies, precautions for the safe operation of equipment, safety management regulations for limited space operations, and precautions for safe construction of specific projects.
2) Site survey: survey the construction site, clarify the well number, purpose, buried depth, direction, pipe diameter, material, length, whether there are branch pipes and curved pipe sections, and the soil quality of the landfill outside the pipe section to be repaired; confirm the drawings and related materials Confirm the correctness of each section of pipeline repair process requirements and acceptance standards.
3) CCTV video detection (pre-CCTV detection) Use CCTV video detection equipment to detect the pipeline to be repaired, clarify the basic condition of the pipeline and the workload of dredging, cleaning, pretreatment, and CIPP repair in the subsequent construction; image interpretation, defect identification, and evaluation Define and classify various types of defects inside the pipeline, and determine their grade according to the severity; measure the relevant parameters of the non-excavation repair of the pipeline to be repaired and the diameter and length of the original pipeline. For the pipe diameter with obvious deformation, multi-point measurement (obtain the length and short diameter of the ellipse) to calculate the ellipticity of the pipe, and provide an accurate data source for the subsequent correct calculation of the diameter and thickness of the liner.
3. UV lining design:
1) Develop UV lining repair plan based on CCTV inspection report and pipeline attribute information. The design of the UV restoration project should meet the following principles: ①, after the restoration, meet the structural strength requirements of the original pipeline design load; ②, after the restoration, meet the flow capacity requirements of the original pipeline design drainage flow;
2) If there are more than 3 spot repairs on the same pipe section, the overall repair should be adopted.
3) When the pipeline is partially damaged, such as missing or missing parts of the pipeline, dislocation of the pipeline joint, cracking of the pipeline, local corrosion of the pipeline, and leakage of the pipeline, the pipeline can be repaired in point.
4) When the hose is towed, it should meet the requirements of the maximum allowable pulling force.
5). The thickness of the lining pipe wall should be based on the image data of the pipeline to be repaired or the pipeline evaluation report, and at the same time sufficient factors such as post-saving groundwater, road dynamic load, original design data of the pipeline, specific requirements of the builder, etc.
6) The structural defect level is level four, and the pipeline is mainly aging or damaged along the way. Structural repair should be adopted. The structural defect level should be level 3, and the main structure is aging or damage along the way. Semi-structural repair should be adopted; When the defect level is Class II or Class 1, and the pipeline tightness is the repair target, it is advisable to adopt anti-extravasation repair.
4. Dredging, cleaning, and testing
1), pipeline plugging, dredging, flushing and local treatment
①. Before the pipeline is repaired, it is necessary to block the pipeline with water, and then use a high-pressure cleaning truck and a suction truck to dredge the pipeline to be repaired.
Flushing and pumping;
②. It is found that there are large protrusions on the inner wall of the pipeline, foreign objects interspersed and other defects, and the pipeline cutting and polishing robot should be used for local treatment and avoidance.
Scratch-free lined hose;
③. If it is found that there is a local leakage in the pipeline, which affects the curing and repair of the UV lining, a local spot repair should be carried out first.
2), pipeline inspection
Before the pipeline is repaired, the inner wall of the pipeline shall be inspected, and the quality of the dredging and cleaning work and the basic condition of the pipeline shall be satisfied
Repair construction requirements of UV light curing lining;
It is required to be able to accurately locate the pipeline defects and judge the defect names and grades.
5. Repair construction:
1) Pull in the UV lined hose
①, pull in the bottom film
Before pulling in the hose, a cushion film (bottom film) should be laid in the original pipe. The cushion film should be placed at the bottom of the original pipe and cover more than 1/3 of the pipe circumference, and it should be fixed at both ends of the original pipe.
②, pull in the lining
Pull the lined pipe into the pipe section to be repaired according to the following specifications: The resin-impregnated hose shall be pulled into the original pipe smoothly and slowly along the cushion film at the bottom of the pipe, and the pulling speed shall not exceed 5m/min; During the process of entering the hose, do not wear or scratch the hose; the ends of the hose should be 300-600mm longer than the original pipe. After the hose is pulled into the original pipe, it should be folded and placed on the bottom film.
3) UV curing
① Inflatable expansion hose
Flush the compressed air according to the requirements of the lining hose material and pipe diameter for inflation pressure and speed, and expand the hose: Before inflation, carefully check whether the tie-head binding is proper;
The inflation device should be installed at the inlet end of the hose, and it should be equipped with a device to control and Display the pressure of the compressed air; check the tightness of each connection of the hose before inflation, and install a regulating valve at the end of the hose; the compressed air pressure should be able to The hose is fully expanded and expanded to closely adhere to the inner wall of the original pipe; it should be carried out in strict accordance with the inflation process of the lining product manual, and a large amount of compressed air should not be rushed into the hose at one time or too quickly to avoid wrinkles in the lining and affect the quality of the solidified pipe .
②. UV curing should meet the following requirements when using ultraviolet light to cure: During the UV curing process, maintain air pressure in the lining pipe to make the lining pipe closely contact the original pipe; the ultraviolet light should be controlled according to the diameter and wall thickness of the lining pipe The pressure, temperature and cruising speed of the lamp chain during the curing process should be recorded in detail in real time, and video recordings of the process before and after curing should be provided; after the lining is cured, the pressure in the tube should be slowly reduced to atmospheric pressure;
2) Post-processing and acceptance:
1 Removal of the end of the lining:
After the curing is completed, remove the tie head, pull back the inner membrane, and the end of the liner pipe should be sealed and cut; the port should be cut flat, and the gap between the liner pipe and the original pipe should be sealed; air-sealed or closed-water test, Confirm that there is no rupture or leakage of the lining hose;
2 Branch pipe opening:
After repairing the main pipeline with branch pipes, the pipe cutting and polishing repair robot shall be used to grind the through holes at the branch pipe joints in accordance with the requirements of the pipeline owner. The main methods to find the location of the drilled hole are as follows: Before laying the lined hose, let the cutting and repairing robot enter the pipeline, drive to the branch pipe and record with tape at the cable meter counter; High-quality lining material, when the pipe diameter is appropriate, After curing, the branch pipe will be dented, and the position of the hole will be found by visually identifying the recessed position; a push rod type small cutting and repairing robot is used to enter from the branch pipe to open the through hole from the branch pipe to the main pipe lining.
Related equipment and construction team manpower allocation
List of construction personnel:
6. Safe construction management
1. Relevant laws and regulations based on safe construction:
1) The construction safety complies with the relevant regulations of the current national standard “Building Construction Safety Inspection Standard” JGJ 59-2011.
2) The pipeline repair construction complies with the “Technical Regulations for the Maintenance of Urban Drainage Pipelines” CJJ 6-2009 and “Technical Regulations for the Maintenance of Urban Drainage Pipes and Pumping Stations” CJJ 68-2007
3) The use of construction machinery complies with the “Technical Regulations for the Use of Construction Machinery” JGJ 33 C 2012.
4) Temporary use of electricity for construction complies with the requirements of “Technical Specification for Safety of Temporary Use of Electricity at Construction Site” JGJ 46 C 2005.
Link to this article：CIPP UV UV curing pipeline trenchless repair lining method