羊蹬河特大桥线形控制技术研究

发布时间：2018-02-26 18:42

本文关键词： 连续刚构桥悬臂施工线型控制立模标高　出处：《湖北工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：近些年国家大力投资基础设施建设,道路交通方面飞速发展的同时桥梁基础建设也在不断发展。其中预应力连续刚构桥以其特有的优点成为我国最具竞争性的桥型之一,特大桥成桥线形技术控制非常关键,且受到很多因素的影响。特别是连续刚构基础墩柱结构沉降、悬臂现浇施工过程的标高和合拢段控制、箱梁挂篮悬臂施工应力和挠度监测控制等。为解决目前施工问题,对成桥线形控制技术进行研究,推动桥梁技术的发展。本文依托羊蹬河大桥项目,分别进行以下几个方面的分析:第一对该桥的桥墩基础进行沉降分析;第二箱梁悬臂现浇过程立模高度和合拢段技术进行控制和分析;第三用模型对桥梁结构加载过程进行行应力和挠度变形监测,最后再进行全过程的误差分析,并得出以下结论:通过长时间的桥墩沉降观测数据分析,得出了两主墩沉降变化相近且与边墩存在极限沉降差时,对线形控制的影响最大;悬臂现浇箱梁施工过程得立模标高和合拢段控制技术是桥梁线形控制重点和关键;对桥梁施工全过程进行控制确保成桥后的线形状态与设计相吻合,必须对悬臂现浇箱梁每个梁段施工阶段的应力和挠度进行监测和跟踪分析,确保成桥线形状态;线形控制要对施工全过程技术参数误差精度进行控制,同时对桥梁施工测得数据进行计算处理分析、严密平差和合理的确定观测量的权,才能保证成桥线形复合设计要求。
[Abstract]:In recent years, the state has invested heavily in infrastructure construction, and the bridge infrastructure has been developing rapidly in the field of road traffic. Among them, prestressed continuous rigid frame bridge has become one of the most competitive bridges in China with its unique advantages. The alignment control of large bridge is very important and affected by many factors, especially the settlement of continuous rigid frame foundation piers, the elevation of cantilever cast-in-situ construction and the control of closing section. In order to solve the current construction problems, the linear control technology of the bridge is studied to promote the development of the bridge technology. This paper relies on the Yangzaihe River Bridge project. The following aspects are analyzed: the first pair of the bridge pier foundation settlement analysis, the second box girder cantilever casting process vertical die height and closing section technology control and analysis; In the third part, the model is used to monitor the stress and deflection of the bridge structure during loading. Finally, the error analysis of the whole process is carried out, and the following conclusions are drawn: through the analysis of the observation data of the settlement of the bridge pier for a long time, It is concluded that when the settlement of the two main piers is similar and there is a limit settlement difference with the side pier, the influence on the linear control is the greatest, and the elevation of the vertical formwork and the closing section control technology are the key points and keys of the bridge alignment control during the construction process of the cantilever cast-in-place box girder. The whole process of bridge construction is controlled to ensure that the linear state of the bridge is consistent with the design. It is necessary to monitor and track the stress and deflection of each section of the cantilever cast-in-place box girder in order to ensure the linear state of the bridge. Linear control must control the error precision of technical parameters in the whole process of construction, at the same time, calculate and analyze the measured data of bridge construction, adjust strictly and reasonably determine the weight of observation quantity, so as to ensure the requirements of the composite design of bridge alignment.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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