Thread Content
As China’s modernization process accelerates, the types and quantities of underground pipelines are increasing steadily. Over time, buried pipes are subject to corrosion caused by soil and other substances, and the pipes themselves age naturally. Leaks and ruptures occur from time to time, which requires continuous repairs or even the replacement of the pipes. Traditional pipeline repair methods involve local patching or laying new pipes, and they present the following problems: 1. Leaks occur at unpredictable times and locations; local repairs can create new risks, failing to resolve the issue fundamentally ； 2. Laying new pipes requires a long construction period, involves large-scale road excavation, and disrupts traffic ； 3. The underground pipelines in enterprises are complex and interwoven, making excavation work difficult; they can easily damage various surrounding public facilities, resulting in negative consequences ； 4. The newly dug pipe trenches are soft; the pipes must adapt to changes caused by crustal subsidence, and weak points such as pipe joints and valves are prone to leakage ； 5. In environments such as roads and factory areas where excavation is not possible, traditional restoration methods are ineffective. Against this backdrop, trenchless pipeline repair technology came into being. Trenchless pipe repair technology first emerged in the oil and gas industry, where it was primarily used for the renewal and repair of oil and gas pipelines. It was later gradually applied to the renovation of water supply and drainage pipelines, and its use expanded rapidly with the adoption of new types of pipes. Unlike traditional repair methods that involve digging up the pipes and burying them again, non-invasive repair uses scientific approaches to carry out pipe repairs without disrupting traffic. Technical advantages: 1. Permanently solves the problem of intermittent pipeline leaks, ensuring safe pipeline management without any risks ； 2. The repair cost is low, at about 60% of that for new pipes ； 3. Local excavation of work pits reduces the amount of roadwork required and the impact on the public transportation environment ； 4. Easy to connect, short construction period, no need for curing, can be repaired and put into use immediately ； 5. There are diverse repair techniques, offering a wide range of applications. Construction advantages: 1. Minimal impact on the environment, traffic, and crowded residential or commercial areas ； 2. Utilize the existing route of the pipeline to be repaired, no route application required, resulting in a short construction period ； 3. It has little impact on the flow capacity of the repaired pipeline ； 4. The small exposed area during construction improves safety. The overall advantage of trenchless pipe repair technology lies in its minimal negative impact; it has little effect on the ground, traffic, the environment, and the surrounding underground pipelines. By making use of the existing pipeline location resources and applying relevant non-excavation pipeline repair techniques without or with minimal road excavation, the service life of the pipelines can be extended. With the continuous development of trenchless repair technologies, some pipes that require excavation can now be repaired using these techniques, leading to an increasing use of trenchless repair methods. Therefore, it is of great significance to promote the application of trenchless repair technology in the field of underground pipeline repair. Jinma Company boasts a variety of non-excavation repair techniques and extensive experience. When carrying out repairs, it selects the appropriate pipe lining method based on factors such as the outer pipe’s diameter, service life, pressure-bearing capacity, and burial conditions, in order to repair damaged pipes and eliminate safety hazards. 01 JMPE Inserion Repair Method: The JMPE Inserion 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. ① 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. ② 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. ③ The single construction length that can be accommodated within rigid PE pipes is up to 1500 meters, which effectively solves the problem of repairing pipes in areas where excavation is not possible, such as those 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 the field of trenchless repair techniques. 02 CIPP In-situ Lining Method: The CIPP in-situ lining method involves applying a layer of thermosetting material to the existing pipe wall; by turning the lining, the flexible lining tube is drawn to the desired position, and it is then cured through heating, thereby creating 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.