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Underground pipelines play an important role in production and daily life. Over time, due to factors such as corrosion and long service life, these pipelines inevitably suffer various damages and leaks, requiring continuous repairs or even replacement, which results in significant economic losses. Moreover, replacing all the pipelines with new ones involves a huge amount of work and a long construction period. Trenchless pipe repair technology enables the safe resumption of pipe operation in a more efficient and rapid manner, using scientific methods without disrupting traffic. Moreover, it poses no threat to the environment during construction, has a short construction period, which reduces the impact on people’s daily lives and production, thereby offering better economic and social benefits. Design requirements for trenchless pipe repair: 1. Applicability of trenchless pipe repair. Trenchless pipe repair technology is not suitable for repairing all damaged pipes; at present, it is not possible to reshape the pipe’s shape. Pipes with large misalignments or significant deformation require excavation and reconstruction. 2. After the repair, ensure that the drainage capacity is sufficient to meet the requirements for pipeline clearance and maintenance. The drainage capacity of the repaired section should generally meet the designed drainage volume; therefore, it is necessary to calculate the drainage capacity after the repair. If this requirement is not met, measures must be taken to compensate for the missing flow rate, otherwise excavation should be carried out to replace the pipeline. If the selected repair technique prevents the maintenance unit from carrying out maintenance, another repair technique should be chosen; if special equipment is required, its installation should be recommended. 3. The site conditions meet the requirements for non-invasive pipeline repair. When factors such as underground pipelines, traffic conditions, and the surrounding environment do not permit excavation for construction, but the conditions for non-invasive pipeline repair are met, then this method should be given priority, provided that it can satisfy the flow requirements of the pipeline after repair. What details should be considered in the trenchless repair of pipelines? 1. Before non-invasive pipeline repair, the inner wall of the pipeline should be inspected, with the ability to accurately locate and identify defects in the pipeline. 2. If local leaks are found in the pipeline, which affect the curing and repair of the UV lining, local spot repairs should be carried out first. 3. In the event of defects such as large protrusions on the inner wall of the pipeline or foreign objects embedded therein, a pipeline cutting and polishing robot should be used first for local treatment to avoid damaging the inner lining hose. 4. Before non-invasive pipeline repair, water-filled pipes must be sealed off; thereafter, high-pressure cleaning vehicles and sludge removal vehicles are used to clear, wash, and pump out water from the pipes to be repaired. Through non-invasive pipeline repair technology, it is possible to control the laying direction and depth of underground pipelines with high precision, as well as to guide the pipelines around underground obstacles. This technology features fast construction speeds and short project durations, which helps to reduce costs significantly. It also helps to avoid the troubles associated with demolition and environmental damage. Therefore, the prospects for non-invasive pipeline repair technology in the field of underground pipeline restoration are bound to be even brighter. Jinma Company offers a variety of trenchless pipeline repair techniques. When carrying out repairs, it is possible to select the appropriate pipeline lining method based on factors such as the outer pipe’s diameter, service life, pressure-bearing capacity, and burial conditions, thereby repairing damaged pipelines and eliminating safety hazards. 1. JMPE Interwoven Repair Method: The JMPE Interwoven Repair Method, an innovation developed by Jinma Company, involves inserting a PE pipe with a diameter smaller than that of the original pipe into the pipe to be repaired, under the condition that this reduction in diameter does not affect normal pipeline operation. Such repair techniques are suitable for water supply, drainage, and gas pipelines with diameters ranging from DN200 to DN2000, made of various materials such as carbon steel, cast iron, cement, PE, etc. The lining tube can independently withstand the design pressure of the pipeline, imposes low requirements on the existing pipeline, and safely extends its service life by 50 years. Single construction runs in rigid PE pipes can reach up to 1500 meters in length, effectively solving the problem of pipe repair in areas where excavation is not possible, such as near the sea, along rivers, beneath highways, or across railways. Pipes repaired through internal insertion not only enhance the strength of the pipes but also prevent leakage and corrosion; moreover, the quality of the repaired pipes remains stable over a long period of time, making it a very effective method within trenchless repair techniques. 2. CIPP In-situ Lining Method: The CIPP in-situ lining method involves applying a layer of thermosetting material to the existing pipe wall; then, by turning the lining, the flexible lining tube is pulled to the desired position, and it is cured through heating, thereby forming a lining tube that fits tightly around the pipe. CIPP is mainly suitable for the repair of pipelines with a diameter of DN600 or less, that are in relatively good condition and capable of withstanding the design pressure. The CIPP lining can reach a length of 1000 meters in a single application, featuring fast construction speeds and low overall costs.