轨道交通跨江连续梁桥施工监控技术研究

发布时间：2018-06-06 09:46

本文选题：轨道交通 + 预应力钢筋混凝土连续梁桥　；参考：《河南工业大学》2017年硕士论文

【摘要】：轨道交通以其低碳环保、速度快、准时、安全舒适、客运量大等技术特点,将成为大城市公共交通的发展方向。预应力混凝土连续梁桥以其独特的优点,被广泛应用在公路桥、铁路桥、城市立交桥及轨道交通。预应力混凝土连续梁桥悬臂浇筑法以其独特的施工特点,被广泛采用。但挂篮悬臂施工过程比较复杂,需经历体系转换的过程。施工过程中的不确定因素会对桥梁的受力状态和线形有很大影响,如不加以控制,可能会造成桥梁合龙困难,甚至会造成在建过程中桥梁坍塌。所以为了保证桥梁施工质量和安全,桥梁施工监控是不可缺少的的重要部分。因此,本文以轨道交通跨清排江连续梁桥为研究背景,对其挂篮悬臂施工过程进行施工监控技术研究。主要研究内容如下:(1)对跨清排江连续梁桥施工过程的有限元仿真分析,根据桥现场实际施工得到的桥梁材料特性、施工误差及边界约束情况对计算模型进行修正。(2)对该桥全过程施工阶段的结构变形、应变监控,以自适应监控方法指导该桥的实施。(3)通过数值模拟与实测数据的对比分析,控制立模标高和关键截面应力。主要研究结论如下:(1)桥梁施工监测的实施对轨道交通跨清排江连续梁桥的悬臂挂篮施工提供了全的、及时的监测和控制工作,为保证施工质量、工程进度和结构安全提供了有力的保障;在每一个梁段悬臂浇筑过程中,均进行了严格的检查和提供了准确的现场实测数据,发现问题及时解决,为大桥的顺利施工提供了有力支持;(2)主梁在悬臂施工过程中和成桥阶段,主梁顶板、底板的实测应力变化无明显的突变发生,其变化趋势与理论计算结果基本保持一致,且控制精度均基本满足±1.5MPa的允许控制偏差要求,结构最终实测受力状态在一般预应力混凝土桥的容许范围之内,结构应力监控表现良好;结构在施工过程及成桥阶段表现出的变形状态与理论计算及设计、监测要求基本一致,包括挠度控制、结构合龙精度以及成桥线形指标等,结构变形监控表现良好;(3)结构施工过程中,主梁内力和结构变形均得到了较好的控制,大桥施工全过程属于受控状态,结构各项成桥指标表现良好。
[Abstract]:Rail transit, with its low carbon environmental protection, fast speed, punctuality, safety and comfort, large passenger capacity and other technical characteristics, will become the development direction of public transportation in big cities. Prestressed concrete continuous beam bridges are widely used in highway bridges, railway bridges, urban flyovers and rail transit due to their unique advantages. The cantilever pouring method of prestressed concrete continuous beam bridge is widely used for its unique construction characteristics. But the construction process of hanging basket cantilever is complex and needs to go through the process of system transformation. The uncertain factors in the construction process will have a great influence on the force state and the line shape of the bridge. If it is not controlled, it may cause the bridge closure difficulty and even cause the bridge to collapse in the process of construction. Therefore, in order to ensure the quality and safety of bridge construction, bridge construction monitoring is an indispensable part. Therefore, based on the research background of rail transit continuous beam bridge across Qingpajiang River, the construction monitoring technology of the cantilever construction process is studied in this paper. The main research contents are as follows: (1) the finite element simulation analysis of the construction process of the continuous beam bridge across the Qinghai-Paijiang River, according to the bridge material characteristics obtained from the actual construction of the bridge, The calculation model is modified by construction error and boundary constraint. (2) the deformation and strain of the bridge during the whole construction stage are monitored, and the self-adaptive monitoring method is used to guide the implementation of the bridge. The comparison and analysis between the numerical simulation and the measured data are carried out. Control vertical die elevation and key section stress. The main research conclusions are as follows: (1) the implementation of bridge construction monitoring provides the whole, timely monitoring and control work for the cantilever hanging basket construction of the rail transit continuous beam bridge across the Qingpai River, in order to ensure the construction quality. The progress of the project and the safety of the structure provide a powerful guarantee. During the casting of the cantilever in each section of the beam, strict inspection is carried out and accurate field measured data are provided to solve the problem in a timely manner. It provides a strong support for the successful construction of the bridge. During the cantilever construction and the completion stage of the bridge, there is no obvious abrupt change in the measured stress change of the main beam roof and floor, and the change trend is basically consistent with the theoretical calculation results. And the control accuracy basically meets 卤1.5MPa 's allowable control deviation requirement. The ultimate measured stress state of the structure is within the allowable range of the general prestressed concrete bridge, and the structure stress monitoring performance is good. The deformation state of the structure in the construction process and the bridge completion stage is basically consistent with the theoretical calculation and design, monitoring requirements, including deflection control, structural closure accuracy and bridge alignment index, etc. In the process of construction, the internal force of the main beam and the deformation of the structure have been well controlled. The whole construction process of the bridge belongs to the controlled state, and all the structural indexes of the bridge are good.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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