钢混组合梁步履式顶推横向偏位产生原因及纠偏对策研究

发布时间：2018-03-28 01:34

本文选题：步履式顶推　切入点：横向纠偏　出处：《西南交通大学》2015年硕士论文

【摘要】：顶推施工方法具有结构预制场地集中,有利于生产作业的最佳组织,施工快捷等优点,在跨越铁路线的桥梁中,被广泛使用。步履式顶推相对传统的拖拉式顶推有一定的优越性,对于一些跨线桥的梁体顶推有着较高的适用性和安全性。我国于2010年在杭州九堡大桥中首次采用步履式顶推工艺,对步履式顶推研究较少,其关键技术的研究远远不能满足实际工程需要。本文依托顶推工程项目,基于理论分析和数据统计分析相结合的研究方法,对钢混组合梁步履式顶推的横向偏位开展了专项研究。内容主要包括以下几个部分：首先,在阅读大量国内外相关文献基础上,综述了步履式顶推的研究现状,找出了该领域研究的不足之处,提出了开展钢混组合梁步履式顶推横向偏位产生原因、规律及纠偏策略的研究课题。其次,用ANSYS建立模型,分析了梁体横向偏位对桥墩横向变形,桥墩的局部压力和对钢箱梁局部稳定的影响。同时对每个行程各个桥墩的顶升千斤顶的行走距离差异进行统计,分析顶推过程中箱梁横向偏位的原因。然后,统计了左右幅在每个顶推循环结束,落梁后的箱梁偏位情况,并根据梁体的偏位监测结果,分析偏位增量的数理统计机理。统计结果表明,单次循环横向偏位增量基本满足正态分布。最后,利用线性优化理论,结合实测梁体偏位数据,提出较为高效的纠偏策略,减少纠偏耗时。以上研究结果可为步履式顶推横向偏位的工程应用和进一步研究提供参考。
[Abstract]:The method of jacking construction has the advantages of centralized prefabricated structure, favorable to the best organization of production operation and quick construction, etc., in the bridge crossing railway line, It is widely used. The walking push has some advantages over the traditional drag-and-pull push. In 2010, in Hangzhou Jiubao Bridge, the walking pushing technology was adopted for the first time. The research of the key technology is far from meeting the actual engineering needs. This paper relies on pushing the project, based on the combination of theoretical analysis and data statistical analysis. A special research on the lateral displacement of steel-concrete composite beams is carried out. The contents mainly include the following parts: firstly, based on reading a large number of domestic and foreign literatures, the research status of stepping thrust is summarized. This paper finds out the shortcomings of the research in this field, and puts forward the research topics on the cause, regularity and rectifying strategy of stepping push lateral deviation of steel-concrete composite beam. Secondly, the model is established by ANSYS. The effects of transverse deflection of beam body on lateral deformation of pier, local pressure of pier and local stability of steel box girder are analyzed. The reasons of transverse deflection of box girder in the process of pushing are analyzed. Then, the deviation of box girder with left and right amplitudes at the end of each pushing cycle and after falling beam is counted, and according to the monitoring results of deflection of beam body, The mathematical statistical mechanism of offset increment is analyzed. The statistical results show that the horizontal offset increment of a single cycle basically meets the normal distribution. Finally, by using the linear optimization theory and combining the measured deflection data of beam body, a more efficient deviation correction strategy is proposed. The results above can provide a reference for the engineering application and further research of step push lateral deflection.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.462

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