大跨宽幅钢箱梁斜拉桥主梁线形控制  

Geometric control of large span cable-stayed bridge with wide steel box girder

作　　者：郑建新[1,2] 于哲[3] 翁方文[1,2] 

机构地区：[1]中交第二航务工程局有限公司,湖北武汉430040 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430040 [3]中交第二公路勘察设计研究院有限公司,湖北武汉430056

出　　处：《中国港湾建设》2016年第12期35-39,共5页China Harbour Engineering

基　　金：中国交建项目(2012-ZJKJ-16)

摘　　要：沌口长江公路大桥为跨径五跨一联双塔双索面纵向半漂浮体系钢箱梁斜拉桥。主梁除塔区及墩顶梁段采用支架安装外,其余梁段均采用悬臂架设。为了实现成桥线形控制目标,采用有限元软件建立分析模型,对该桥不对称施工荷载下线形控制措施及架设过程安全性、主梁无应力制造线形、参数敏感性、宽幅钢箱梁吊装匹配等进行了精确的分析。结果表明,通过无应力索长控制,可以实现成桥及主梁制造无应力线形的对称性,确保施工安全;对主梁自重和斜拉索下料长度等影响线形的主要敏感性因素进行识别,能有效实现成桥线形控制目标;采用在腹板位置设置马板进行调节,能达到断面线形匹配的目的。Zhuankou Yangtze Highway Bridge is a cable-stayed bridge of longitudinal half-floating system with 5 spans anddouble-pylon double-plane. In addition to the beam segments over the pylon pier tops using the bracket installation, theremaining beams are taking cantilever erection. To realize the bridge geometric control target, we used the finite elementsoftware to modeling erection process safety and the bridge geometric control measures on asymmetric construction load, theunstressed manufacturing geometric shapes, structural parameter sensitivity, wide box girder hoisting matching. The resultsindicate that the bridge and girder unstressed manufacturing geometric shapes symmetry and the construction safety can berealized through the control of unstressed length of cables. By the structural parameter sensitivity identify of main beam weightand cable unstressed length, can effectively realize the bridge geometric control target. Using the mask in the web plate, canrealize the section line matching.

关 键 词：大跨宽幅钢箱梁 斜拉桥 主梁架设 敏感性分析 匹配分析 线形 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]