老旧城区供热一次网非开挖修复技术适用性研究

Key Points

• To assess the applicability of various non-dig repair techniques for heating networks under high temperature and pressure conditions.
• Systematic review of current non-dig repair techniques, including in-situ curing, insertion, folding liner, diameter reduction, and spraying methods.
• Construction of a multidimensional evaluation index system based on operational conditions and spatial constraints of heating networks.
• In-situ curing and folding liner methods demonstrate superior overall performance suitable for most aging urban heating networks.
• Significant differences were found in adaptability regarding pipe diameter, temperature resistance, structural loading capacity, and construction efficiency.
• Insertion and spraying methods are limited by temperature tolerance and structural strength but may serve as supplementary options under specific conditions.