Abstract:The cured-in-place pipe (CIPP) method, as the mainstream technology for trenchless repair of underground pipelines at present, is constrained in practical applications by many shortcomings of traditional temperature monitoring techniques. There are disadvantages such as blind spots in full-line monitoring, low accuracy in temperature measurement, and lack of quality traceability capabilities. And it is also prone to insufficient resin curing due to environmental interference such as groundwater infiltration, ultimately leading to poor repair effect and rework. The distributed optical fiber sensing (DOFS) technology based on the light scattering effect has the capability of long-distance real-time monitoring at centimeter-level intervals, and has the characteristics of anti-electromagnetic interference and corrosion resistance, which can be adapted to the complex underground construction environment. Applying this technology to CIPP repair projects can monitor the changes in curing temperature in real time, accurately locate the abnormal values and promptly adjust construction parameters, effectively addressing the pain points of traditional monitoring. At present, this technology has been successfully applied and validated in multiple pipeline repair projects in Shanghai, Zhejiang and other areas. The bending elastic modulus of the inner lining all meet the design requirements. The significant practical significance is for improving the quality of CIPP repair projects.
