无铰钢管混凝土拱桥增跨顶升关键技术  

Key Techniques for Jacking-up and Span Lengthening of a Hingeless Concrete-Filled Steel Tube Arch Bridge

作　　者：刘世忠[1] 欧阳永金 张慧[1] 蔺鹏臻[1] 王佳[3] 冀伟[1] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070 [2]厦门市市政建设开发总公司,福建厦门361009 [3]兰州工业高等专科学校建筑工程系,甘肃兰州730050

出　　处：《桥梁建设》2012年第3期24-30,共7页Bridge Construction

基　　金：国家自然科学基金(50968008);甘肃省道路桥梁与地下工程重点实验室开放基金(No.Kfjj-10-01)~~

摘　　要：为满足交通需求,厦门市某无铰钢管混凝土拱桥桥下道路需从双向6车道拓宽至双向10车道,相应需对原拱桥进行顶升增跨改造。改造需将原拱桥整体提升1.7 m,跨径由43.2 m增加至46 m。改造时首先在原结构上张拉临时系杆,使桥梁由无铰拱变为系杆拱,然后进行拱脚切割、顶升增跨施工,最终形成新的无铰钢管混凝土拱桥并解除临时系杆。为确保各施工阶段结构的安全,采用ANSYS建立拱桥有限元模型,对施工全过程进行仿真分析及位移和应力监测。仿真分析及监测结果表明,结构实际位移及受力与理论分析结果吻合较好;改造全过程中结构位移及受力的变化均在合理范围,不影响改造后的使用安全。To cater for the traffic demand, the road under a hingeless concrete-filled steel tube arch bridge in Xiamen City needed to be widened from dual 3 lanes to dual 5 lanes and ac- cordingly the existing arch bridge over the road had to be rehabilitated by jacking up and span lengthening, i.e. the bridge was to be integrally jacked up 1.7 m and the span of the bridge was to be lengthened from 43.2 m to 46 m. In the rehabilitation process of the bridge, the temporary tie members were firstly added to and tensioned on the existing bridge to make the bridge change from a hingeless arch to a tied arch, then the arch springs of the bridge were cut off, the bridge was jacked up, the span was lengthened and finally a new hingeless bridge was formed and the temporary tie members were released. To ensure the structural safety of various construction sta- ges, the finite element model for the bridge was established, using the ANSYS, the simulation a- nalysis of the whole construction process was made and the displacement and stress were moni- tored. The results of the simulation analysis and monitoring show that the aetual displacement and force conditions of the bridge are in good agreement with those of the theoretic analysis. The changes of the structural displacement and force conditions tion process are within rational range and the service safety affected after rehabilitation. of the bridge in the whole rehabilita- of the bridge has not been adversely

关 键 词：系杆拱桥 钢管混凝土结构 增跨 顶升 改造 监测 有限元法 

分 类 号：U448.225[建筑科学—桥梁与隧道工程] U445.6[交通运输工程—道路与铁道工程]