龙葵路铁路跨线桥连续梁悬臂施工控制技术研究

发布时间：2018-06-23 18:50

本文选题：连续梁桥 + 悬臂施工　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：随着我国经济的迅猛发展以及桥梁施工技术的不断进步,越来越多的桥梁正在被兴建。预应力混凝土连续梁桥是其中的常用桥型,其多采用悬臂施工的方法进行建设。在施工过程中,由于材料容重、弹性模量、截面尺寸以及混凝土的收缩徐变等因素的影响,使得桥梁各阶段的内力和变形偏离预期,给全桥的顺利合龙带来困难。因此,为了保证全桥的顺利合龙以及成桥线形和受力状态符合要求,在桥梁施工过程中对桥梁结构状态进行准确的监控就显得十分必要。本文对桥梁施工监控的发展现状及其目的和意义进行了阐述,接着对施工监控的方法和内容进行了总结,详细介绍了挂篮预压试验和总体施工方案。通过Midas、桥梁博士建立龙葵路铁路跨线桥模型,分析了各施工阶段内力和变形情况,并得到施工预抛高值。在施工监控过程中,使用最小二乘法对材料容重和混凝土弹性模量进行了识别和修正,取得了较好的效果。本文在对龙葵路铁路跨线桥的监控结果进行分析过程中,对比了桥梁施工过程中的本阶段挠度、多个施工阶段造成的累计挠度和整体施工过程中截面应力测点的实际测量数据和理论计算数据。通过对比可得,成桥后全桥线形平顺、受力合理,说明施工监控是成功的。
[Abstract]:With the rapid development of our economy and the continuous progress of bridge construction technology, more and more bridges are being built. Prestressed concrete continuous beam bridge is one of the commonly used bridges, which is usually constructed by cantilever construction. During the construction process, due to the influence of material bulk density, elastic modulus, cross-section size and shrinkage and creep of concrete, the internal force and deformation of the bridge deviate from expectations, which makes it difficult for the bridge to close smoothly. Therefore, in order to ensure the smooth closure of the whole bridge, as well as the completion of the bridge shape and force state in line with the requirements, in the bridge construction process to accurately monitor the state of the bridge appears to be very necessary. This paper expounds the present situation, purpose and significance of bridge construction monitoring, then summarizes the methods and contents of construction monitoring, and introduces in detail the test of hanging basket preloading and the overall construction scheme. The model of the railway span bridge of Longkui Road is established by Midas and Dr. Bridge, and the internal force and deformation of each construction stage are analyzed, and the pre-throwing height of the construction is obtained. In the process of construction monitoring, the material bulk density and the elastic modulus of concrete are identified and corrected by the least square method, and good results are obtained. In this paper, in the course of analyzing the monitoring results of the railway bridge in Longkui Road, the deflection of the bridge in this stage is compared. The accumulated deflection caused by multiple construction stages and the actual measurement data and theoretical calculation data of the section stress measurement points in the whole construction process. Through comparison, it is found that the whole bridge is smooth, and the force is reasonable, which shows that the construction monitoring is successful.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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