2013年9月上第42卷：
第17期
DOI:10.7672/sgjs2013170075
施工技术
CONSTRUCTIONTECHNOLOGY
大蒸港曲线宽幅矮塔斜拉桥施工监控
向科
（中铁二十四局集团有限公司，上海200071）
【摘要】以大蒸港曲线、宽幅、单索面矮塔斜拉桥工程为背景，述了自适应施工控制方法的运用。采用空间模型按实际施工顺序分析了斜拉索索力、整体结构内力和位移，对钢主塔应力、主梁应力和变形以及斜拉索索力进行了实时监控，并依据计算和实测结果对施工参数进行实时调整。实测钢主塔和主架各测试断面的应力和变形满足监
控要求，斜拉索家力监控值也与计算值吻合较好。该方法的运用为桥施工质量提供了可靠保证。[关键调］桥梁工程斜拉桥；施工控制；数值分析；监测
【中图分类号】U445
【文献标识码】A
【文章编号】1002-8498(2013)17-0075-03
Construction Monitoring for the Dazhenggang Curved Broad Width
Cable-stayed BridgewithDwarfedTowers
XiangKe
(China Railway 24th Bureau Group Co.,Lad.,Shanghai200071,China)
Abstract; Using the Dazhenggang curved cable-stayed bridge with broad width, single plane and dwarfed towers as an example,this paper illustrated the application of adaptive construction control method. Accordingto the actual construction sequence,thecable tension,the internalforces and overall structural displacements were analyzed with space models. The main tower stress,the stress and deformation of primary beams, and the cable tension forces were monitored on-site,The construction control parameters of the bridge were adjusted constantly on the basis of the calculation results and on-site monitoring results. It was shown that the stress and deformation of the main tower and primary beams satisfied the monitoring requirements, and the cable tension forces were in good agreement with the calculated values. The application of the construction control method effectively ensured the construction quality of the bridge.
Key words :bridges; cable stayed bridges; construction control; numerical analysis; monitoring
1工程概况
大蒸港矮塔斜拉桥是上海市A15公路工程中的3座大桥之，按双向8车道断面设计，桥梁桩号 K10+284.922—K10+629.922，大蒸港河床现状宽约137m，航道线与桥轴线斜交偏角约38°，为单索面矮塔斜拉桥，跨径组合为90+165+90=345m。主桥平面位于半径为3000m的缓和曲线上，全桥具有弯塔、曲梁和空间单索面等特点，是目前国内首座弯塔平曲面矮塔斜拉桥，桥梁立面布置如图1 所示。
该桥主塔高24m，为钢-混组合结构，上部拉索锚固区横断面呈纺锤形，矮塔横向向道路弧线外侧【作者简介】向科，博士，高级工程师，E-mail;xiangke@gmail.com
[收稿日期】2013-02-15 万方数据
75
倾斜。全桥布置2×6对共计24根斜拉索，塔上索距1.5m，梁上索距8m。主梁为3跨预应力混凝土变截面箱梁，采用单箱5室截面，箱顶宽34m，底宽 17.499~21.542m，翼缘悬臂板宽4.5m，箱梁根部梁高7m，梁端和跨中处梁高3.5m，采用挂篮法施工。桥墩墩身为倒梯形，采用斜交正做的方法，横断面为哑铃形，采用直径1.5m的钻孔灌注桩，边墩在岸上，采用3柱实心墩、PHC预应力管桩基础。 2施工监控
2.1施工监控方法
本桥的施工控制采用较为成熟的自适应法，其原理如图2所示。当结构监测到的受力状态与模型计算结果不相符时，通过将误差输入到参数辨识算法中去调节计算模型的参数，使模型的输出结果与