跨铁路曲线桥水平转体施工及监控技术研究

发布时间：2018-07-21 21:36

【摘要】：在跨越交通繁忙的既有线路修建桥梁时,采用转体施工法有其独特的优越性。近些年来,桥梁转体施工法得到了广泛的应用,桥梁转体施工法正朝着更大跨度、更大转体重量、更多的桥梁结构形式发展。为保证桥梁施工质量与安全,对较大跨径、较复杂结构桥梁的施工过程有必要进行全程监测与控制。论文以西柏坡高速公路田家庄互通转体T构为研究背景,通过对施工过程进行理论分析与施工监测、控制,为桥梁施工过程的安全以及成桥后线形、结构内力的优化提供依据。论文利用有限元软件Midas Civil 2010建立全桥模型,按照设计施工步骤模拟实际施工顺序。全桥分析中主要提取了主梁张拉前后、支架拆除前后、转体后及合龙段施工等关键施工阶段结构线形变化和内力变化,总结其变化规律。利用有限元细部分析软件Midas FEA对T构根部及转体系统进行了空间应力分析,总结T构根部在复杂内力下的应力分布规律;分析研究转体过程中桥墩、转台、转盘、球铰、承台等结构的应力分布状态。根据施工监控的原则、方法以及施工阶段划分确定了相应的监测内容,主要采集主梁张拉前后、支架拆除前后、转体施工及合龙施工等关键施工阶段监测数据,通过综合分析及与理论值比较,判断桥梁结构在各施工阶段所处的内力及变形状态,并作为调整下一步施工过程的理论依据。为保证桥梁结构在转体过程中安全、稳定,转体前进行称重试验,测试T构不平衡力矩,根据试验结果合理布置配重,使T构转体过程中始终处于较为合理的平衡状态。
[Abstract]:In the construction of bridges across existing lines with heavy traffic, the method of rotary construction has its unique advantages. In recent years, the bridge rotation construction method has been widely used, the bridge rotation construction method is moving towards a larger span, greater weight and more bridge structure. In order to ensure the quality and safety of bridge construction, it is necessary to monitor and control the whole process of bridge construction with large span and complex structure. This paper takes Tianjiazhuang Interchange T structure of Xibaipo Expressway as the research background, through theoretical analysis and construction monitoring and control of the construction process, provides the basis for the safety of the bridge construction process, the alignment after the bridge completion and the optimization of the internal force of the structure. The whole bridge model is built by the finite element software Midas Civil 2010, and the actual construction sequence is simulated according to the design and construction steps. In the analysis of the whole bridge, the main beam before and after the tension, before and after the removal of the support, after the rotation and the construction of the closure section of the key construction phase of the structure shape changes and internal force changes, summed up the changes of the law. Using Midas FEA, a finite element software, the spatial stress analysis of T structure root and rotation system is carried out, and the stress distribution law of T structure root under complex internal force is summarized, and the pier, turntable, turntable and ball hinge are analyzed and studied. Stress distribution of structure such as cap. According to the principle of construction monitoring, the method and the division of construction stages, the corresponding monitoring contents are determined. The monitoring data of key construction stages, such as before and after the main girder tension, before and after the removal of the support, the rotary construction and the closing construction, are collected. Through comprehensive analysis and comparison with the theoretical values, the internal force and deformation state of the bridge structure in each construction stage are judged and used as the theoretical basis for adjusting the construction process in the next step. In order to ensure the safety and stability of the bridge structure in the process of rotation, the weight test is carried out before the rotation, and the unbalance moment of the T structure is measured. According to the test results, the weight distribution is reasonably arranged, so that the balance state of the T structure is always in a more reasonable balance state during the process of the T structure rotation.
【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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