昆明跨线桥步履顶推施工关键技术研究

发布时间：2018-06-06 03:46

本文选题：顶推施工 + 钢槽梁　；参考：《广西科技大学》2014年硕士论文

【摘要】：多点同步步履顶推施工是近几年发展的新技术，该方法采用了一种步履顶推装置，其功能集顶升、平移、横向纠偏于一体。顶推过程中，顶推装置放置在临时墩上，相互独立支承主梁，不再像传统拖拉顶推那样支承点相互作用影响。另外，在装置内部设滑动面，滑动面不再在主梁底部，可有效保证顶推装置与主体结构的接触，改善主体结构受力，，对主体结构几乎零损伤。该方法通过各顶推装置上的临时垫块，易保证梁的预拱度曲线。目前，国内外对该项新技术研究较少，有必要对钢桥在顶推过程中的关键技术进行研究。文中以昆明市南昆铁路跨线桥的钢槽梁顶推施工作为工程背景,对步履顶推过程中的关键技术，进行了如下研究：（1）对步履式顶推的施工原理、顶推装置和顶推施工工艺过程进行了详细研究，针对南昆铁路跨线桥钢槽梁顶推研究出了详细、可行的施工方案。（2）运用有限元分析软件Ansys，建立全桥杆系有限元模型，对南昆铁路跨线桥钢槽梁顶推施工过程中整体结构受力进行了分析计算，并研究出相对合理的结构。（3）建立钢槽梁局部实体有限元模型，对钢槽梁在顶推装置处的局部受力状态进行详细分析，探究了橡胶垫块弹性模量和角隅加劲肋对钢槽梁局部受力性能的改善作用。利用杆系有限元模型整体分析的结果，对施工中最不利工况下的顶推装置钢结构进行接触受力分析，研究出合理的局部受力结构。（4）对步履顶推装置的最大顶升力、水平顶推的同步性能和竖向顶推的同步性能等方面进行了试验研究，为后续工程施工建立坚实的基础。（5）研究了南昆铁路跨线桥在顶推施工监控中的主要内容，并详细计算了钢槽梁顶推过程中墩顶标高的调整。工程施工过程中，证明了标高调整方法的正确性。
[Abstract]:In recent years, a new technique has been developed in the construction of multi-point synchronous stepping and pushing. This method adopts a kind of stepping and pushing device, which has the functions of lifting, translation and lateral rectifying in one body. In the process of pushing, the thrust device is placed on the temporary pier and supports the main beam independently. In addition, the sliding surface is no longer at the bottom of the main beam, which can effectively ensure the contact between the thrust device and the main structure, improve the force of the main structure, and almost zero damage to the main structure. This method is easy to guarantee the curve of beam camber by the temporary cushion on each pushing device. At present, there are few researches on this new technology at home and abroad, so it is necessary to study the key technology of steel bridge in the process of pushing. The key technologies in the process of stepping and pushing are studied as follows: (1) the construction principle, the pushing device and the construction process of the walking pushing are studied in detail, and the detailed research on the steel groove beam pushing of the railway span bridge of the Nan-Kun Railway is given. By using finite element analysis software Ansys, the finite element model of the whole bridge bar system is established, and the stress on the whole structure during the construction process of the steel slot beam of the railway span bridge in Nankun Railway is analyzed and calculated. The local solid finite element model of steel slot beam is established, and the local stress state of steel slot beam at the pushing device is analyzed in detail. The effect of elastic modulus of rubber cushion and corner stiffener on the local mechanical properties of steel grooved beam was investigated. Based on the results of the integral analysis of the finite element model of the bar system, the contact force of the steel structure of the thrust device under the most unfavorable working conditions in construction is analyzed, and the reasonable local force structure is studied. In this paper, the synchronous performance of horizontal push and vertical thrust are tested and studied to establish a solid foundation for the construction of subsequent projects. (5) the main contents of the supervision and control of the superbridge in the construction of the Nan-Kun Railway are studied. The adjustment of the height of the top of the pier during the pushing process of the steel slot beam is calculated in detail. In the course of engineering construction, the correctness of elevation adjustment method is proved.
【学位授予单位】：广西科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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