基于三维激光扫描的钢桁拱桥吊索塔架施工线形监测研究  

Research on 3D Laser Scanning Based Line-Shape Monitoring for Towers of Cable-Stayed Cantilever Assembly System Used in Steel Truss Arch Bridge Construction

作　　者：石林泽 赵健 任延龙 安路明 程斌[1] SHI Lin-ze;ZHAO Jian;REN Yan-long;AN Lu-ming;CHENG Bin(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;China Railway Construction Bridge Engineering Bureau Group Co. ,Ltd. ,Tianjin 300300,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]中国铁建大桥工程局集团有限公司,天津300300

出　　处：《世界桥梁》2022年第1期79-85,共7页World Bridges

基　　金：天津市科技开发计划项目(19YDL ZSF00030);中国铁建股份有限公司科技开发计划项目(2018-C05);中国铁建大桥工程局集团有限公司科技研究开发课题(DQJ-2019-B24)。

摘　　要：为确保悬臂拼装钢桁拱桥施工的安全性与精准性,以主跨436 m的中承式钢桁拱桥——广州明珠湾大桥吊索塔架施工为背景,运用三维激光扫描技术对吊索塔架进行多工况线形监测,结合多点位多视角监测与智能点云数据处理,进行吊索塔架垂直度指标计算,并与全站仪测量结果对比。结果表明:三维激光扫描技术可直观表达吊索塔架空间姿态与构造形式,且可便捷地提取其垂直度监测指标;2种监测方法的垂直度指标差值基本在±1‰内,三维激光扫描结果可准确反映吊索塔架实际施工线形;结合三维激光扫描线形监测与风缆张拉控制,吊索塔架的各项垂直度指标均保持在±3‰内,满足施工安全要求。In this paper,the Mingzhu Bay Bridge in Guangzhou,which is a half-through steel truss arch bridge,is taken as a case to study the monitoring techniques that can assure the safety and accuracy of the construction of steel truss arch bridge when using a cable-stayed cantilever assembly system.The 3D laser scanning based monitoring technique was applied to monitor the line-shapes of towers of the cable-stayed cantilever assembly system under diverse load cases.Combined with the multi-perspective field monitoring and intelligent point-cloud processing,the perpendicular indexes of the fastening stay towers were computed.The monitoring results were compared with the results monitored by total station.It is shown that the 3D laser scanning can express the spatial posture and configuration of the fastening stay tower visually,and extract its perpendicularity index conveniently.The difference between the perpendicularity indexes of two monitoring methods is mostly limited within±1‰,indicating that the 3D laser scanning results can accurately reflect the actual line-shape of fastening stay towers.And perpendicularity indexes of fastening stay tower line-shape have been controlled within±3‰after the implementation of 3D laser scanning for line-shape monitoring and wind cables tensioning control,indicating that the construction safety met the requirements.

关 键 词：钢桁拱桥 吊索塔架 施工线形监测 三维激光扫描 垂直度指标 施工技术 

分 类 号：U448.224[建筑科学—桥梁与隧道工程] U446.2[交通运输工程—道路与铁道工程]