下承式连续钢桁梁顶推施工关键技术研究

发布时间：2018-06-12 02:17

本文选题：连续钢桁梁桥 + 顶推　；参考：《郑州大学》2014年硕士论文

【摘要】：下承式连续钢桁梁桥是由下层桥面系中的混凝土板与纵、横梁或下弦杆组成一体而共同受力，其具有较大的刚度、动力性能较好、建筑高度较低、行车时的噪声和振动较小等优点，是高速铁路大跨度桥梁较常用的结构形式之一。钢桁梁桥的节点及杆件较多，节点连接的构造比较复杂，给施工带来较大困难。顶推施工法具有经济安全、快速、无干扰、占用场地少等优点，在大跨度桥梁建设中应用广泛。所以研究大跨度下承式钢桁梁桥施工技术特别是顶推施工技术具有重要的工程应用价值。新建郑焦城际铁路黄河大桥为郑焦城际铁路暨改建京广铁路跨越黄河的共用桥梁，为4线铁路特大型桥梁。大桥主桥67#-88#墩采用11联2×100m下承式变高度连续钢桁梁，其中67#-79#墩水中6联12孔钢桁梁采用无导梁单联单点顶推方案施工，为国内首次采用，，顶推施工中钢桁梁节点处滑块单点最大反力达2650t，为国内最大，这给施工带来了很大的难度和风险。本文根据郑焦城际铁路黄河大桥主桥的结构特点，结合水文、地质、交通等情况，对郑焦城际铁路黄河大桥主桥钢桁梁顶推施工方案进行了研究，完成的主要工作有： (1)给出了郑焦城际铁路黄河大桥主桥总体施工方案，并分析了工程施工的重点和难点。 (2)建立钢桁梁桥顶推施工的仿真计算模型，利用有限元软件Midas/Civil对连续钢桁梁顶推施工总体方案进行了研究，模拟了顶推施工过程各工况下的受力状态。 (3)对连续梁顶推施工控制系统进行了研究，探讨了竖向顶升系统、水平顶推系统、防偏系统、锚固系统、滑块系统、上墩装置等系统的布置。 (4)对连续钢桁梁顶推施工工艺进行了研究，给出了钢桁梁拼装施工方案、钢桁梁顶推施工方案和落梁施工方案，确保了郑焦城际铁路黄河大桥施工顺利完成。
[Abstract]:The through continuous steel truss girder bridge is composed of concrete slabs, longitudinal beams or lower chords in the lower deck system, which has the advantages of high stiffness, good dynamic performance and low building height. The advantages of low noise and vibration are one of the common structural forms of long span bridges in high speed railway. There are more joints and members of steel truss bridge, and the structure of joint connection is more complicated, which brings more difficulties to construction. The push-push construction method is widely used in the construction of long-span bridges because of its advantages of economic safety, fast, no interference and less occupied space. So it has important engineering application value to study the construction technology of large-span through steel truss bridge, especially the jacking construction technology. The new Zhengjiao Intercity Railway Yellow River Bridge is a common bridge for Zhengjiao Intercity Railway and the reconstruction of Beijing-Guangzhou Railway across the Yellow River. For the 4-line railway super-large bridge. The main bridge 67#-88# pier adopts 11 through 2 脳 100m through continuous steel truss beam with varying height, among which the 67-79# pier water 6-link 12-hole steel truss beam is constructed by single point pushing scheme without guide beam, which is the first time adopted in China. The maximum reaction force of the slider at the joint of steel truss beam is 2650t, which is the biggest in China, which brings great difficulty and risk to the construction. According to the structural characteristics of the main bridge of the Zhengjiao Intercity Railway Yellow River Bridge, combined with the hydrological, geological and traffic conditions, this paper studies the construction scheme of the steel truss beam of the main bridge of the Zhengjiao Intercity Railway Yellow River Bridge. The main works accomplished are as follows: 1) the overall construction plan of the main bridge of Zhengjiao Intercity Railway Yellow River Bridge is given, and the key points and difficulties of the construction are analyzed. 2) the simulation calculation model of the jacking construction of the steel truss girder bridge is established. Using the finite element software Midas / Civil, the general scheme of continuous steel truss beam jacking construction is studied, and the stress state of continuous steel truss beam under various working conditions is simulated. The control system of continuous beam jacking construction is studied, and the vertical lifting system is discussed. Horizontal pushing system, Anti-deviation system, Anchorage system, Slide system, Upper Pier device, etc. The construction technology of continuous steel truss beam is studied, and the construction scheme of steel truss beam assembly is given. The construction scheme of steel truss beam pushing and falling beam ensures the construction of the Yellow River Bridge of Zhengjiao Intercity Railway to be completed smoothly.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.462

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