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大跨度连续梁桥悬臂施工线形监控技术研究
摘要:本文以兰新第二双线跨肃州路(40+64+40)m的连续梁挂篮悬臂施工为例,介绍了其线形控制的理论及方法。为了保证桥梁能够按设计及规范要求顺利合拢,线形控制达到预期的目标,利用有限元正装分析法进行模拟计算,计算出在各外界因素影响下的梁体预拱度设置,然后通过实测数据与理论数据进行比较分析,对计算模型进行修正。最终合拢误差在1cm范围内,,中轴线误差在1cm范围内,梁体线形得到了较好的控制。
关键词:悬臂施工;线形监控;计算模型;误差分析
The technology research on linear control in cantilever construction of large-span continuous beam bridge
Abstract: with regard to the (40+64+40)m continuous beam bridge on the second double line cross Suzhou road from Lanzhou to Urumqi, the linear control theory and method are introduced to ensure the bridge plete closure essfully based on the designed standard and have an ideal linear. The FEM method is used to simulation. The camber is calculated under the influence of external factors, then the calculation model is corrected paring the measured data with theoretical data. Closure error is controlled within the range of 1cm, beam bottom elevation error within after the finished stage, axis error within 1cm, and finally the linear control achieves good result.
Key words: cantilever construction; linear control; calculation model; error analysis
0 引言
随着高速铁路的快速发展,挂篮悬臂浇筑法越来越广泛地被应用于预应力混凝土连续梁桥的施工中。由于受挂篮自重、变形,施工荷载,风力等因素的影响,大跨径预应力混凝土连续梁施工过程中线形控制难度较大。为保证合拢前两悬臂端高程及轴线误差及合拢后梁体各项控制指标符合设计、规范要求,对梁体施工过程进行全面监控,及时调整线形控制参数是十分必要的。
1工程概况
兰新第二双线酒泉立交特大桥以(40+64+40)m连续梁结构形式跨越肃州路,桥型布置如图1所示。,梁体为单箱单室,变高度、变