刚性系杆拱桥更换吊杆的施工监控  

Construction Monitoring and Control of Hanger Replacement of a Rigid Tied Arch Bridge

作　　者：张西强 赵云强 陈慧 

机构地区：[1]中交路桥技术有限公司,北京100018 [2]北京深华达交通工程检测有限公司,北京102200

出　　处：《桥梁建设》2014年第5期118-122,共5页Bridge Construction

摘　　要：琼州大桥主桥为(88+98+108+98+88)m下承式钢管混凝土系杆拱桥,该桥5跨为互相独立的无推力外部静定体系,拱肋均为钢管混凝土哑铃形断面,共118根吊杆,下锚头部位锈蚀程度严重的8根吊杆采用临时兜吊系统进行更换施工。为保证吊杆更换施工中结构受力合理及安全,采用吊杆内力和桥面标高双控制原则,对吊杆更换过程进行施工监控。利用MIDAS Civil软件建立全桥有限元模型模拟吊杆更换施工,对吊杆拉力及桥面标高进行分析。结果表明:更换吊杆后桥面各项指标均在控制范围以内,且满足桥梁设计规范要求。The main bridge of the Qiongzhou Bridge is a concrete-filled steel tube （CFST） through tied arch bridge with span arrangement （88 ＋ 98 ＋ 108＋ 98 ＋ 88） m. The 5-span arch structures of the main bridge are the externally statically determinate systems that are mutually independent and are with no thrust. The cross sections of the arch ribs are all the CFST dumbbell-shape sections and there are totally 118 hangers for the whole bridge. Of these hangers, 8 hangers that were severely corroded at the parts of their lower anchor heads were replaced, using the temporary bottom-carrying lifting system. To ensure that the force conditions of the structures were reasonable and safe in the hanger replacement construction, the principle of double control of the hanger internal forces and bridge deck elevation was adopted and the construction process of the hanger replacement was monitored and controlled. The software MIDAS Civil was used to establish the model for the whole bridge, the hanger replacement construction was simu- lated and the hanger internal forces and deck elevation were analyzed. The results show that the various indices of the deck after the hanger replacement are within the controlled ranges and can meet the relevant requirements of the bridge design codes.

关 键 词：拱桥 刚性系杆 吊杆更换 临时兜吊系统 桥面标高 吊杆拉力 有限元法 施工监控 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U445.7[交通运输工程—道路与铁道工程]