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目前我国排水管道采用原位固化内衬(CIPP)进行非开挖修复的设计理论并不完善,主要参考《城镇排水管道非开挖修复更新工程技术规程》CJJ/T210-2014,存在的主要问题是没有考虑CIPP内衬出现的各种几何缺陷,包括褶皱、环状间隙等对圆周支撑系数K值的影响。通过总结已有的研究成果认为:内衬的尺寸比DR、褶皱和环状间隙等参数对K值有重要影响,建议在CIPP修复设计中,引入褶皱和环状间隙等几何缺陷的强度折减系数;在进行CIPP内衬修复设计时,应该通过施工前CCTV检查结果,结合施工经验预测几何缺陷尺寸,综合确定相应的圆周支撑系数K值。
At present, the design theory of non-excavation repair of drainage pipelines by using CIPP in China is not perfect, mainly referring to the main problems of CJJ / T210-2014, Technical Guidelines for Trenchless Reconstruction of Urban Drainage Pipelines It does not take into account the geometric defects of CIPP lining, including the influence of wrinkles, annular clearance and so on on the circumferential support coefficient K value. By summarizing the existing research results, it is considered that the size of the liner has an important influence on the K value than the DR, the wrinkle and the annular gap, and it is suggested that the strength reduction of geometric defects such as wrinkles and annular gaps should be introduced in the CIPP repair design Coefficient; in the design of CIPP lining repair, CCTV inspection results before construction should be combined with the construction experience to predict the geometric defect size, comprehensively determine the corresponding circumferential support coefficient K value.