城市更新背景下，既有建筑屋面渗漏问题日益突出，传统检测方法存在定位精度低、主观性强、修补区域界定模糊等不足。本文提出一种基于红外热成像与无损电阻抗联合检测的屋面渗漏精准检测及修补区域确定方法。首先，建立“排雷格子法”网格化基准，将屋面划分为标准化检测单元；其次，采用红外热像仪进行面域扫描，结合RWS渗漏巡检仪进行线路追踪，构建“面域+线路”双重校验的多维联合检测体系；再次，基于Python算法实现渗漏区域连通域分析、DBSCAN聚类、凸包与最小包围矩形计算，建立最小修补面积确定模型；最后，通过某项目屋面渗漏检测工程进行验证。结果表明，该方法渗漏点定位误差小于0.5 m，修补面积计算误差低于5%，检测效率较传统方法提升约80%，为城市更新中既有建筑屋面渗漏精准检测与科学修缮提供了可靠的技术支撑。

城市更新；既有建筑；红外热成像；屋面渗漏；精准检测；修补区域确定

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