摘要
宣杭铁路改建工程湖州特大桥为无竖杆整体节点平行弦三角桁架钢桁梁桥,采用浮托顶推工艺实施架设,由于顶推前端通过浮墩支撑导致施工稳定性较差。基于此,针对顶推姿态控制较难的问题,开发了一套快速、准确测量梁体偏位的装置,并据此开发了控制措施和配套的监控策略;同时针对浮托架设特点,通过Midas建立全桥空间有限元模型,分析支点的不平衡受力状态,根据计算结果给出主要的监控要点和监控措施。通过对监控方法的进一步研究,拓展了浮托顶推的应用范围,丰富了施工经验,对修建同类桥梁具有一定的指导和借鉴意义。
The Xuzhou-Hangzhou Railway Reconstruction Project Huzhou Special Bridge is a steel truss bridge with no vertical bars and parallel chords.It is erected by the floating roof jacking process.The construction stability is poor due to the thrusting front end supported by the floating pier.Based on this,a set of devices for quickly and accurately measuring the deflection of the beam body was developed for the problem of difficult push-pitch attitude control.Based on this,control measures and supporting monitoring strategies were developed.At the same time,the characteristics of the floating bracket were adopted.Midas establishes a full-bridge spatial finite element model,analyzes the unbalanced stress state of the fulcrum,and gives the main monitoring points and monitoring measures according to the calculation results.Through further research on the monitoring method,the application range of the floating support is expanded,and the construction experience is enriched,which has certain guidance and reference significance for the construction of similar bridges.
出处
《建筑技术开发》
2019年第23期47-48,共2页
Building Technology Development
关键词
桥梁
钢桁梁
施工控制
浮托
顶推
bridge
steel truss beam
construction control
floating support
push
