摘要
公路铁路两用桥大跨径钢桁梁采用桥位高强度螺栓动态拼接,精度要求达亚毫米级,是测量技术的难点。以沪通长江大桥跨横港沙112m简支梁和跨天生港336m钢拱桥钢桁梁拼装为背景,从施工测量控制网布设及改造、GNSS网基线解算、工厂制造精度管理、高墩变形应对措施、TS30全站仪三维坐标法精度分析等方面,探讨了复杂施工条件下大跨径钢桁梁拼装测量技术。结果表明,控制网投影变形小于1mm,结构变形后平面点位中误差为±0.9mm,高程点位中误差为±0.4mm。沪通长江大桥钢桁梁拼装测量技术合理可行,可供同类型桥梁借鉴。
Long span steel truss girder of road rail bridge uses dynamic splicing of high strength bolt with bridge position,and its difficult for measuring technology to reach submillimeter accuracy.Using the Hutong Changjiang River bridge crossing Henggang Sand with 112 msimple supported beam and crossing Tiansheng Harbor with 336 msteel arch bridge with steel truss girder as a background,the large span steel truss girder erection measurement technology under complex construction conditions is discussed from construction surveying control network layout and transformation,GNSS baseline solution,manufacturing precision management,solution measure for defortion of high piers,TS30 total station three-dimensional coordinate method and accuracy analysis.The results show that,the accuracy of baseline solution was 10^（-7）,the projection distortion of control network was less than 1 mm,the error of the plane point position after the structural deformation was ±0.9 mm,and the error of the height point was ±0.4 mm.The measurement technology of steel truss beam assembling of Hutong Changjiang River bridge was reasonable and feasible,which could be used for reference for the same type of bridge.
作者
蔡少云
李桂华
OAI Shao-yun;LI Gui-hua(Section of Hutong Changjiang River Project,CCCC Sencond Harbor Engineering Co.,Ltd,Nantong Jiangsu 226361,China;School of Earth Sciences and Engineering,Hohai University,Nanjing Jiangsu 210098,China)
出处
《现代测绘》
2018年第2期16-19,共4页
Modern Surveying and Mapping
基金
江苏省科技厅前瞻性联合研究项目(SBY2015002-04 0358)
关键词
公路铁路两用桥
大跨径钢桁梁
动态栓接拼装
GNSS网基解算
rail-cum-road brige
long span steel truss girder
dynamic bolting and assembling
GNSS net base solution
