基于BIM的超大跨度空间网壳结构场馆三维激光扫描生成方法

BIM⁃based 3D laser scanning generation method for reticulated shell structure venues with large⁃span space

受网壳结构场馆跨度大小的影响,导致激光扫描图像空间轴与真实场景图像坐标轴之间的偏离程度较大,为保证扫描图像能准确、真实地反映网壳结构场馆的空间布局形式,提出基于BIM的超大跨度空间网壳结构场馆三维激光扫描生成方法。根据BIM建模原则实施Revit族参数化处理,再联合相关参数指标完成基于BIM的超大跨度空间网壳结构场馆建模。按照点云匹配条件连接提取得到的特征线段,通过解算激光点坐标的方式,确定扫描图像中的激光点布局形式,完成超大跨度空间网壳结构场馆三维激光扫描图像生成。实验结果表明:BIM建模方法可将扫描图像空间轴与真实场景图像坐标轴之间的偏离程度控制在5%以内,能够较好地反映超大跨度网壳结构场馆的空间布局形式。

Affected by the span size of the venue with reticulated shell structure,there is a large deviation between the spatial axis of the laser scanning image and the image coordinate axis of the real scene.In order to ensure that the scanning image can accurately and truly reflect the spatial layout of the reticulated shell structure venues,a BIM based 3D laser scanning generation method for the reticulated shell structure venues with large⁃span space is proposed.According to the BIM modeling principle,the parameterization processing of Revit family is implemented,and the related parameter indexes are combined to complete the BIM based modeling of the reticulated shell structure venues with large⁃span space.According to the point cloud matching conditions,the extracted feature line segments are connected,the laser point layout in the scanning image is determined by solving the laser point coordinates,and the generation of the 3D laser scanning image of the reticulated shell structure venue with large⁃span space is completed.The experimental results show that the BIM modeling method can control the deviation between the spatial axis of the scanned image and the coordinate axis of the real scene image within 5%,and can better reflect the spatial layout of the reticulated shell structure venues with large⁃span space.