城市地下管网非开挖修复技术的力学适应性与工程应用

Mechanical Adaptability and Engineering Applications of Trenchless Rehabilitation Technologies for Urban Underground Pipeline Networks

摘要: 针对城市地下管网老化、泄漏等问题，传统开挖修复技术存在施工周期长、对环境扰动大等弊端，非开挖修复技术因其微创优势得到广泛应用。为揭示不同非开挖修复技术的力学适应性规律，指导工程选型与施工优化，本文系统梳理主流非开挖修复技术(CIPP内衬、折叠内衬、喷涂修复、机械制管法)的技术原理，通过室内试验与数值模拟分析其力学性能(抗压强度、抗裂性、界面粘结强度)及在复杂工况(不同管径、土壤压力、地下水作用)下的适应性；结合3个典型工程案例，验证技术应用效果，并提出力学性能优化路径。研究表明：CIPP 内衬技术在DN400-DN1200管径管道中力学适应性最优，修复后管道环刚度可达12 kN/m²以上；喷涂修复技术对不规则断面管道适配性强，但抗冲击性能较弱(冲击强度仅1.2 kJ/m²)；机械制管法在高地下水压力工况下(水压>0.8 MPa)稳定性优于其他技术。本文成果可为城市地下管网非开挖修复工程的技术选型、力学性能设计及施工质量控制提供理论支撑与工程参考。

Abstract: Aiming at the problems of aging and leakage of urban underground pipe networks, traditional excavation repair technology has drawbacks such as long construction period and great environmental disturbance. Trenchless rehabilitation technology has been widely used due to its minimally invasive advantages. To reveal the mechanical adaptability laws of different trenchless rehabilitation technologies and guide engineering selection and construction optimization, this paper systematically sorts out the technical principles of mainstream trenchless rehabilitation technologies (CIPP lining, fold-and-form lining, spray-on lining, mechanical pipe bursting). Through laboratory tests and numerical simulation, their mechanical properties (compressive strength, crack resistance, interface bonding strength) and adaptability under complex working conditions (different pipe diameters, soil pressure, groundwater action) are analyzed. Combined with 3 typical engineering cases, the technical application effect is verified, and the optimization path of mechanical performance is proposed. The results show that the CIPP lining technology has the best mechanical adaptability in pipes with diameters of DN400-DN1200, and the ring stiffness of the repaired pipe can reach more than 12 kN/m²; the spray-on lining technology has strong adaptability to pipes with irregular cross-sections, but its impact resistance is weak (impact strength is only 1.2 kJ/m²); the mechanical pipe bursting technology has better stability than other technologies under high groundwater pressure conditions (water pressure > 0.8 MPa). The results of this paper can provide theoretical support and engineering reference for the technical selection, mechanical performance design and construction quality control of urban underground pipe network trenchless rehabilitation projects.