科科迪桥钢梁曲线制造的线形控制技术  

Geometry Control Technology for Steel Beams of Cocody Bridges Curve Manufacturing

作　　者：卞佳 赵聪明 朱帆 BIAN Jia;ZHAOCong-ming;ZHU Fan(Road&.Bridge International Co.Ltd.,Beijing 100027,China)

机构地区：[1]中交路桥建设有限公司,北京市100027

出　　处：《公路》2024年第9期91-98,共8页Highway

摘　　要：为满足境外桥梁中钢梁曲线制造的景观要求,以主跨为200 m跨度的科科迪桥为背景,利用直线、圆曲线、二次多项式曲线分别拟合考虑预拱度的各钢梁梁段的制造线形,从标高、纵坡、对接错台等方面分析3类曲线的拟合误差并最终确定采用二次多项式曲线拟合制造线形,钢梁在厂内按曲线加工制造,现场安装时对线形进行精确控制。结果表明,二次多项式曲线比直线、圆曲线能更精确地拟合考虑预拱后的钢梁各梁段制造线形,经过控制后的主梁线形精度高,符合景观要求。In order to meet the landscape requirements of overseas steel beam curve manufacturing,using a Cocody Bridge with a main span of 2oo m as the background,a straight line,a circular curve,and a quadratic polynomial curve are used to separately fit the manufacturing line of each steel beam section considering pre-arching.The fitting errors of the three types of curves are analyzed in terms of elevation,longitudinal slope,misdocking,etc.,and the final decision is made to use quadratic polynomial curves for fitting the manufacturing alignment.The steel beams are processed and manufactured according to curves in the factory,and the geometry is accurately controlled during on-site installation.The results show that the quadratic polynomial curves can be more accurately fitted than straight lines and circular curves to consider the linear shape of each beam section of the pre-arched steel beam.After control,the main beam line shape has high accuracy and meets the landscape requirements.

关 键 词：桥梁工程 钢梁曲线制造 线形控制 制造线形 预拱度 

分 类 号：U445.472[建筑科学—桥梁与隧道工程]