Abstract
In order to standardize the inspection and evaluation methods for Drains, by study the non-excavation pipeline repair project in Tianjin and the surrounding areas, the quality assessment parameters， choose CCTV Inspection for the best, finally concludes the defect type, establish the condition assessment model, including structural and functional defects. Investigate the technical specification for CCTV inspection and evaluation, it can provide a reliable basis for maintenance and economic analysis. At the same time, introduce absorpted and innovated many advanced repairing technology.
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