钢管混凝土连拱桥拱肋拆除施工控制关键技术及工程应用  

Key Technologies and Engineering Application of Arch Rib Demolition Construction Control of Concrete-filled Steel Tube Double Arch Bridge

作　　者：杨继承 魏家乐 余曾 雷波涛 YANG Jicheng;WEI Jiale;YU Zeng;LEI Botao(Shaanxi Transportation Holding Group Tongyu Transportation Research Co.,Ltd.,Xi’an,Shaanxi 710118,China)

机构地区：[1]陕西交控通宇交通研究有限公司,陕西西安710118

出　　处：《水利与建筑工程学报》2022年第5期166-171,共6页Journal of Water Resources and Architectural Engineering

基　　金：陕西交通运输厅2021年度交通科研项目“基于缆索吊装施工的大跨径钢管混凝土连拱桥拆除控制关键技术研究”(21-65K)。

摘　　要：大跨径危旧钢管混凝土连拱桥成桥拱肋内力复杂,拆除过程体系多次转换,连拱效应突出,且受外界条件影响十分敏感,施工风险高,为保证拆除过程的安全,有必要对拱肋拆除施工控制关键技术进行研究。文章以某桥为工程背景,拟定了拱肋变形、应力、临时索索力的拆除控制原则,制定了迭代仿真模拟计算方法,结合温度、索力参数敏感性分析结果和拆除过程的关键风险点,提出了拆除前拱肋刚度识别、拱顶打开应力监测与控制、全过程临时索索力检测和关键项目实施监测技术等四项措施。依托工程按照文中提出的施工控制技术顺利完成了全桥拱肋的拆除,实施效果良好,可为类似工程提供参考。The internal force of the arch rib of the long-span dilapidated concrete-filled steel tubular double arch bridge is complex.The demolition process system has been converted many times which means the double arch effect is prominent.It is very sensitive to external conditions,and the construction risk is high.In order to ensure the safety of the demolition process,it is necessary to analyze the key technology of arch rib demolition construction control.Taking a bridge as an engineering background,this paper formulates the demolition control principles of arch rib deformation,stress and temporary cable force,and formulates the iterative simulation calculation method.Combined with the sensitivity analysis results of temperature and cable force parameters and the key risk points in the demolition process,four measures are proposed,including the identification of arch rib stiffness before demolition,the monitoring and control of arch crown opening stress,the detection of temporary cable force in the whole process and the implementation monitoring technology of key projects.Relying on the construction control technology proposed in this paper,the demolition of the arch ribs of the whole bridge was successfully completed,and the implementation effect is good,which can provide reference for similar projects.

关 键 词：钢管混凝土连拱桥 拱肋拆除 施工控制 斜拉扣挂法 迭代法 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]