利用三维激光扫描技术进行地铁隧道施工质量管控及病害检测

三维激光扫描技术具有不接触、高密度、高精度和数字化等特点,可实现地铁隧道全息、全面、快速三维测量。在土建施工阶段,分别对隧道初支及二衬进行三维扫描,可快速获取初支断面的超欠挖情况及二衬限界情况;将初支与二衬扫描获取的点云进行叠加计算,可分析隧道施工二衬的厚度。在地铁隧道运营阶段,采用移动三维激光扫描技术对隧道进行扫描,可快速获取隧道的全息数据,从点云中可分析、提取隧道渗水、裂缝、管片错台等病害信息。本文采用三维激光扫描技术对青岛地铁部分工点的施工质量及病害检测进行了测试、应用,介绍了其数据采集流程及点云分析处理,为三维激光扫描技术在地铁隧道的推广应用提供了一定的借鉴意义。

Construction quality control and disease detection of subway tunnel based on 3D laser scanning technology

The 3D laser scanning technology has the characteristics of no contact, high density, high precision and digitization, and can realize the holographic, comprehensive and rapid 3D measurement of subway tunnel. In the civil construction stage, the three-dimensional scanning of the first branch and the second lining of the tunnel can be carried out separately, and the over-underdigging and the second lining limit of the first branch section can be quickly obtained. In the operation stage of the subway tunnel, the mobile three-dimensional laser scanning technology is used to scan the tunnel, which can quickly obtain the holographic data of the tunnel, and can analyze and extract the disease information such as tunnel seepage, crack, pipe piece wrong platform and so on from the point cloud. The 3D laser scanning technology is used to test and apply the construction quality and disease detection of Qingdao subway parts, and its data acquisition process and point cloud analysis are introduced, which provides some reference for the popularization and application of 3D laser scanning technology in subway tunnel.