Trenchless rehabilitation of sewage pipelines from the perspective of the whole technology chain: A state-of-the-art review

Sewage pipelines play a pivotal role in urban underground lifeline systems. However, due to imperfect planning and design, inferior pipeline quality, rough construction, multi-load coupling, complex service environment, and chaotic coordination between management departments, the sewage pipelines in early service have experienced serious aging and deterioration. This paper provides a state-of-the-art review of trenchless rehabilitation technologies for sewage pipelines from the perspective of the whole technology chain, including cleaning technologies, rehabilitation technology decision methods, and trenchless technologies. In addition, a pretreatment technology for pipeline leakage plugging, subsidence lifting, and erosion void filling, based on two-component non-water reaction foaming polyurethane (TNRF-PU) material was presented. The technical characteristics, advantages, drawbacks, and application scenarios of each technology and method were summarized and compared. Moreover, 23 standards related to trenchless rehabilitation technology for sewage pipelines were collected to enable potential users to quickly identify standards to which they can refer. Finally, gaps, challenges, and future developments in the whole technology chain of trenchless rehabilitation of sewage pipelines were discussed.