摘要
交通强国目标促进着桥梁建造技术的发展,预制节段梁作为新型桥梁建造技术日趋成熟。在采用短线法进行节段梁预制、安装的过程中小误差易被累计放大,影响成桥线型。对此,以黄茅海跨海通道混凝土节段梁为研究对象,采用“理论+实例”的思路,系统地研究了基于点云的预制节段梁成品检测及虚拟预拼装的成套解决方案,即通过三维激光扫描仪快速获取节段梁的外形轮廓尺寸,研究随机抽样一致算法(RANSAC)对各切片进行自动化边界拟合及角点位置提取实现成品检测;采用普氏分析法(PA)和迭代最近点法(ICP)相结合的方法进行虚拟预拼装技术研究。结果表明:通过点云技术可实现节段梁成品外观尺寸的检测,准确高效;虚拟预拼装技术可有效控制节段梁相邻节段的匹配误差,保证成桥线型提高预制节段梁的质量。
The strategy of building China's transportation strength accelerates the development of bridge construction,and precast segmental beams are becoming more mature as a new bridge construction technology.The commonly used short-line method for the pre-assembly and installation of segmental beams would cause the accumulation of small errors which affects the shape of the bridge.Based on the concrete segmental beam of the Huangmaohai Sea-crossing Channel,this paper followed the concept of"theoretical+practice"to systematically study the complete set of solutions for the point cloud-based finished product inspection and virtual pre-assembly for the precast segmental beam,that is,using the 3D laser scanner to quickly obtain the contour and size of the segmental beam.The Random Sample Consensus(RANSAC)was used to automatically fit the boundary and extract the corner point position of each slice,to realize the finished product inspection,and the Procrustes Analysis(PA)and Iterative Closest Point(ICP)were combined to study the virtual pre-assembly technology.The results indicated that the point cloud technology could accurately and efficiently inspect the appearance and size of the finished segmental beams,and the virtual pre-assembly technology could effectively control the matching error of the adjacent segmentation of segmental beams,ensure the shape of the bridge,and improve the quality of the precast segmental beams.
作者
闫振海
刘天成
YAN Zhenhai;LIU Tiancheng(CCCC Highway Bridges National Engineering Research Centre Co.,Ltd.,Beijing 100088,China)
出处
《山西交通科技》
2024年第1期63-67,共5页
Shanxi Science & Technology of Transportation
关键词
节段梁
BIM
点云
虚拟预拼装
成品检测
segmental beam
BIM
point cloud
virtual pre-assembly
finished product inspection
