津秦客专沙河特大桥连续梁悬臂施工技术研究

发布时间：2018-03-16 03:07

本文选题：悬臂施工　切入点：连续梁　出处：《兰州交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几年来,随着我国高速铁路的大规模建设,急需修建更多的大跨度桥梁以跨越大江、大河和海湾等障碍物。预应力混凝土连续梁桥在铁路客运专线桥梁中占据了越来越大的比重,同时悬臂浇筑施工法近年来也得到较快的发展,我国已建成的跨度较大的预应力混凝土连续梁桥大部分采用此法施工。连续梁桥变形小,刚度大,抗震能力强,行车条件好,养护简单。连续梁桥在生活中是一种比较常见的结构形式,本次设计我们主要针对的是连续梁中的典型代表:预应力混凝土连续梁桥。另外,对采用悬臂浇筑施工的桥梁,为确保桥梁结构合拢精度、成桥线形和运营一定时间后能达到设计所要求的标高,需要对施工过程中桥梁结构各部分的变形进行监测与监控。悬臂浇筑桥梁的施工监控主要包括结构线形和结构应力两方面内容,必须进行全面跟踪控制才能使桥梁施工顺利进行,达到设计标准。通过背景工程桥结构分析模型,选择合适结构参数识别,充分考各种影响因素,经计算监测、预测,实现大桥线形和应力的不断调和控制,达到了预定的目标。目前,虽然悬臂对称施工方法已比较成熟,但高速铁路的高标准要求又对该施工方法提出了更高的要求。本文结合沙河特大桥的施工,对三跨连续梁的悬臂施工技术做了详细的介绍。首先对目前国、内外的混凝土连续梁梁悬臂施工技术做了概括总结。其次,结合背景工程介绍了连续梁悬臂施工中的0#块施工技术、挂篮施工技术并详细阐述了托架的设计、检算和线性观测过程。然后,介绍了三跨连续梁桥的合拢技术,并结合背景工程提出了合拢段施工关键技术的解决方案。最后,本文结合背景沙河特大桥(60+100+60)m三跨连续梁的施工,对三跨连续梁桥施工方法、施工监控技术的介绍,论述了桥梁施工控制的重要性。并采用大型桥梁专业计算软件Midas/civil对该三跨连续梁桥进行有限元模拟分析,得到了与施工监控相关的位移、应力的理论值。论文结合背景工程对三跨连续梁悬臂施工技术进行了详尽的阐述,给出了三跨连续梁悬臂施工过程中的关键技术的解决方案。对以后同类桥型的建设起到了一定的指导作用。
[Abstract]:In recent years, with the large-scale construction of high-speed railway in China, it is urgent to build more long-span bridges to cross the river. The prestressed concrete continuous beam bridge has occupied more and more proportion in the railway passenger dedicated line bridge, and the cantilever pouring construction method has also been developed rapidly in recent years. Most of the long-span prestressed concrete continuous beam bridges in China are constructed by this method. The continuous beam bridges have the advantages of small deformation, large stiffness, strong seismic resistance and good driving conditions. Maintenance is simple. Continuous beam bridge is a common structural form in daily life. This design is mainly aimed at the typical representative of continuous beam: prestressed concrete continuous beam bridge. In order to ensure the closing accuracy of the bridge structure, the alignment of the bridge and the elevation required by the design can be achieved after the completion of the bridge line and the operation for a certain time. It is necessary to monitor and monitor the deformation of each part of the bridge structure during the construction process. The construction monitoring of cantilever pouring bridge mainly includes two aspects: the structure alignment and the structural stress. In order to carry out the bridge construction smoothly and reach the design standard, it is necessary to carry out the overall tracking control. Through the analysis model of the bridge structure in the background engineering, the appropriate structural parameters are selected, and all kinds of influencing factors are fully tested, and the calculation, monitoring and prediction are carried out. The continuous harmonic control of the alignment and stress of the bridge has been achieved. At present, although the cantilever symmetrical construction method is relatively mature, However, the high standard requirement of high speed railway puts forward higher requirements for the construction method. This paper introduces in detail the cantilever construction technology of three span continuous beam combined with the construction of Shahe super bridge. The cantilever construction technology of concrete continuous beam beam inside and outside is summarized. Secondly, the construction technology of 0# block in continuous beam cantilever construction, the construction technology of hanging basket and the design of bracket are introduced in combination with the background engineering. Then, the closing technology of the three-span continuous beam bridge is introduced, and the solution of the key technology of the closing section construction is put forward in combination with the background engineering. This paper introduces the construction method and construction monitoring technology of three-span continuous beam bridge based on the background Shahe Bridge's construction of 6010060m continuous beam. The importance of bridge construction control is discussed, and the finite element simulation analysis of the three-span continuous beam bridge is carried out by using the large-scale bridge professional calculation software Midas/civil, and the displacement related to construction monitoring is obtained. The paper expatiates the cantilever construction technology of three-span continuous beam in combination with background engineering. The solution of the key technology in the cantilever construction of three-span continuous beam is given, which plays a guiding role in the construction of the similar bridge type in the future.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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