摘要
攀枝花新密地大桥为主跨182m的混凝土拱桥,采用悬臂浇筑法施工拱圈,为确保施工过程的安全性和成桥状态的准确性,需要在施工各阶段对线形、索力及应力等参数进行监控。以上游拱圈监控工作为背景,利用MIDAS Civil建立全桥空间分析模型,基于正装法计算出各拱段浇筑及张拉过程的理想结构参数,在误差允许范围内合理调整扣锚索的索力来调整悬臂结构的实际状态,再根据拱段实测参数修正监控计算模型,达到计算模型与实桥施工状态的统一。施工过程中对拱圈线形、扣索和锚索的索力、拱圈应力、临时塔位移等结构参数的监控结果表明,主拱圈各项参数控制良好,满足设计要求。
The New Midi Bridge in Panzhihua is a concrete arch bridge with a main span 182 m and the arch ring of the bridge was constructed by the cantilever casting method. To ensure the safety of the construction process and the correctness of the completed bridge status, the geometric shapes, cable forces and stress of the bridge at various construction stages were monitored and controlled. By way of example of the construction monitoring and control of the arch ring of the upstream side part, the MIDAS Civil was used to set up the spatial analysis model for the whole bridge of the bridge, the ideal structural parameters of the cantilever casting and tensioning process of each segment of the arch ring were calculated, using the forward iteration method. Within the allowable error range, the cable forces of the fastening and anchoring stays were rationally adjusted so as to adjust the actual status of the cantilever structure and the calculation model for the monitoring and control was then updated in accordance with the measured parameters of the segments so as to make the model agree with the actual construction status. The results of the monitoring and control of the geometric shapes of the arch ring, cables forces of the fastening and anchoring stays, stress of the arch ring and displacement of the temporary towers in the construction process show that all parameters of the arch ring have been well controlled and can meet the design requirements.
出处
《桥梁建设》
EI
CSCD
北大核心
2012年第4期87-92,共6页
Bridge Construction
基金
中央高校基本科研业务费专项资金资助项目(2010ZT01)~~
关键词
箱形拱桥
悬臂浇筑
施工监控
施工阶段
扣索
锚索
box arch bridge
cantilever casting
construction monitoring and control
construction stage
fastening stay
anchoring stay
