利用点云切片提取技术分析桥梁形变

Bridge deformation analysis based on point cloud slice extraction technique

三维激光扫描技术作为近年来发展迅速的测绘手段,在桥梁健康监测中,已经成为监测技术的重要组成部分。本文以武汉市某跨江大桥为例,首先采用Trimble SX10三维激光扫描仪对桥梁进行长期监测扫描,并对桥梁钢结构和桥墩的点云进行切片;然后在Trimble Business Center和Trimble RealWorks软件的帮助下对每期的扫描点云进行处理,提取桥拱断面点坐标并对桥墩切片点云进行最佳垂直圆柱体拟合,获取拟合平面中心点坐标;最后对比分析每期特征点平面坐标的偏差和三维偏移量。本文研究成果验证了三维激光扫描仪在桥梁变形监测中的可行性,丰富了桥梁监测数据的表现形式,可以为相关研究提供依据和参考。

As a rapidly developing surveying and mapping tool in recent years,3D laser scanning technology has become an important part of the monitoring technology in bridge health monitoring.In this paper,taking a cross-river bridge in Wuhan as an example,a Trimble SX10 3D laser scanner is used to scan the bridge for long-term monitoring,and the point clouds of the bridge steel structure and piers are sectioned.Then the scanned point clouds of each phase are processed with the help of Trimble Business Center and Trimble RealWorks software to extract the point coordinates of the bridge arch sections and perform the best vertical cylinder fitting of the bridge pier slicing point clouds.It obtains the coordinates of the fitted plane center points,compares and analyzes the deviations and 3D offsets of the plane coordinates of the feature points of each phase.The research results of this paper verify the feasibility of 3D laser scanner in bridge deformation monitoring,enrich the bridge monitoring data presentation,and can provide the basis and reference for related research.