Virtual Preassembly Technology of Steel Box Segment Based on PCL

doi:10.3969/j.issn.1674-0696.2024.01.02

Abstract

Abstract: In view of the shortcomings of virtual preassembly technology in current engineering applications, such as strong subjectivity, low-level automation, and complex data processing process, the PCL was firstly introduced to virtual preassembly technology of steel box segment based on point cloud data. Firstly, a set of control point extraction method from surface to line, and from line to point was designed according to the section characteristics of steel box segment. Secondly, based on the high-efficient point cloud processing algorithm in PCL, the initial point cloud data of the assembly segment was preprocessed, control point extraction and matching were then carried out, and the assembly error results were output. Finally, the algorithms used in virtual preassembly technology were connected in series to form a complete set of virtual preassembly program for steel box segment, achieving data input and result output. The proposed virtual preassembly technology was applied to the adjacent segments of a certain steel box structure bridge, and the calculated maximum assembly error of 1.22mm was compared with that specified in the code. The results show that the virtual preassembly technology based on PCL can effectively complete the preassembly work of steel box segments, with the advantages of accurate results and high degree of automation. The vertical displacement of the segment control point under the state of hoisting stress is in the range of 0.08~0.14mm. The results show that the control point coordinates obtained by factory scanning can be used to guide the actual engineering assembly.

Key words: bridge engineering; steel box segment; virtual preassembly technology; PCL

摘要： 针对目前工程应用中的虚拟预拼装技术存在主观性强、自动化程度低、数据处理过程较为复杂等缺点，首次提出将PCL应用于基于点云数据的钢箱节段虚拟预拼装技术。首先根据钢箱节段截面特征设计一套由面到线、由线到点的控制点提取方法；然后基于PCL中的高效点云处理算法对待拼装截面初始点云数据进行预处理、控制点提取及匹配，输出拼装误差结果；最后将虚拟预拼装技术中使用到的算法串联成群，形成一套完整的钢箱节段虚拟预拼装程序，实现从数据输入到结果输出。将提出的虚拟预拼装技术应用于某钢箱结构桥梁相邻节段，并将计算所得最大拼装误差1.22 mm与规范规定误差进行对比分析，说明基于PCL的虚拟预拼装技术可以有效完成钢箱节段的预拼装工作，具有结果准确、自动化程度高等优点;吊装有应力状态下的节段控制点竖向位移处于0.08~0.14 mm范围内，结果表明工厂扫描得到的控制点坐标可用于指导实际工程拼装。

关键词: 桥梁工程；钢箱节段；虚拟预拼装技术；PCL

CLC Number:

U445.4

ZHU Aizhu1, WANG Jiameng1, PAN Wenming2，CUI Bing3, ZHU Hongping1. Virtual Preassembly Technology of Steel Box Segment Based on PCL[J]. Journal of Chongqing Jiaotong University(Natural Science), 2023, 43(1): 10-17.

朱爱珠1，王佳盟1，潘文铭2，崔冰3，朱宏平1. 基于PCL的钢箱节段虚拟预拼装技术[J]. 重庆交通大学学报（自然科学版）, 2023, 43(1): 10-17.

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