Prediction of Construction Traction Force for Corroded Pipeline Rehabilitation Using Multilayer Composite Liners

The rehabilitation of corroded pipelines is critical for maintaining the global energy supply chain. Traditional repair methods, involving the replacement of damaged sections, are economically prohibitive and environmentally disruptive. This study addresses these challenges by focusing on the innovative inserted liner method, a trenchless technique offering a more sustainable and cost-effective solution. Through numerical simulations and full-scale experimental investigations, the study predicts the traction forces required during the liner insertion process, especially in pipelines with multiple bends. The effects of bend angles, friction coefficients of the pipeline’s inner wall, and number of bends on the traction forces are investigated. Results indicate that the traction force increases with higher friction coefficients and a greater number of bends, while it decreases with larger bend angles. To further enhance the feasibility of this method, friction reduction measures, such as the application of lubricating oil and filling the annular space with water, are explored, demonstrating significant reductions in traction forces. This research employs the longest full-scale experimental platform for inserted liner methods, providing insights and practical guidelines for the implementation of this technique in complex long-distance pipeline systems.