连续箱梁桥挂篮施工监控关键技术研究

发布时间：2018-07-03 15:17

本文选题：桥梁工程 + 连续梁桥　；参考：《郑州大学》2017年硕士论文

【摘要】：郑州某市政组合立交高架桥处于城市主干道的交叉位置,道路交通量极大,该桥的修建不仅要满足通行需求,仍要兼顾与周边环境美观相协调的要求,社会关注度高,同时工期要求紧、任务重。该组合立交的中跨度最长、高度最高的M主线主跨桥,为单箱双室、双幅并排布置的预应力连续混凝土桥梁,设计为挂篮施工、双幅桥梁标高误差应控制在±30mm以内,建设单位要求应社会需求要提前合拢竣工,该工程在施工过程中首次采用8个挂篮同时施工、钢筋绑扎与混凝土养生同步进行的特有工艺,该工艺与常规的只考虑安全、质量,只考虑自身的线形标高有所区别,更多的引入了加快工期、双幅桥梁相互标高一致的问题,本文以该桥为例,针对该施工方法进行了以下几方面的研究工作:1.总结分析了国内外预应力混凝土连续梁桥的挂篮施工方法、监控方法、有限元建模分析等方法,为本工程的顺利施工提供了经验、数据依据。2.通过Midas软件进行桥梁有限元分析,通过Midas软件对桥梁和挂篮结构进行分析,精确地得到悬臂梁在各个节段、各个截面的内力和变形,为施工过程中的立模标高控制、预拱度控制等以及挂篮的制作提供了数据支持、安全性评价等。3.引入了自适应控制方法,通过对参数进行敏感性分析识别主要、次要参数,并对施工过程的监测数据进行调整,减小了参数误差的累计,保证了桥梁的顺利合拢。4.通过对线形、应力的监测,把桥梁高程及线形、桥梁结构及混凝土的受力状况,控制在了合理的范围内,使得整个施工工期结构处于安全、可控的范围内,确保了桥梁的内力状态和结构线形满足设计要求,为桥梁的顺利合拢打下了良好基础。5.研究了挂篮延伸施工过程中、双幅桥梁并排施工过程中桥梁梁体的内力和线形调整变化的特点,通过实测数值与计算值进行比较、分析和调整,有效的控制了桥梁的线形、应力变化过程,为成桥后达到设计和规范要求、类似桥梁的施工提供了相关施工参数。
[Abstract]:The viaduct of a municipal combination interchange in Zhengzhou is in the crossing position of the main urban road, and the traffic volume of the road is great. The construction of the bridge should not only meet the traffic demand, but also take into account the requirements of harmony with the surrounding environment, and the social concern is high. At the same time, the time limit is tight and the task is heavy. The composite interchange has the longest span and the highest height of the M mainline main span bridge, which is a prestressed continuous concrete bridge with single box and two chambers and two parallel frames. The design is a hanging basket construction, and the elevation error of the double bridge should be controlled within 卤30mm. The construction unit requires the completion of the project to be completed in advance according to the needs of the society. For the first time in the construction process of the project, eight hanging baskets are used at the same time. The special process of steel bar binding and concrete health preservation is carried out at the same time, and the process and routine only consider safety and quality. Only considering the difference of their own linear elevation, more introduced the problem of accelerating the construction period, and the two bridges are consistent in each other's elevation. This paper takes the bridge as an example and does the following research work on the construction method: 1. This paper summarizes and analyzes the construction method of hanging basket, monitoring method and finite element modeling analysis of prestressed concrete continuous beam bridge at home and abroad, which provides experience for the successful construction of the project. The finite element analysis of bridge is carried out by Midas software, and the bridge and hanging basket structure are analyzed by Midas software. The internal force and deformation of cantilever beam in each section and section are accurately obtained, which is the control of elevation of vertical formwork in construction process. Pre-arch control and the production of hanging basket provide data support, security evaluation, etc. 3. An adaptive control method is introduced to identify the main and secondary parameters by sensitivity analysis of the parameters and to adjust the monitoring data of the construction process to reduce the accumulative error of the parameters and to ensure the smooth closure of the bridge. Through the monitoring of line shape and stress, the bridge height and shape, bridge structure and concrete stress condition are controlled in a reasonable range, which makes the whole construction period structure in a safe and controllable range. It ensures that the internal force state of the bridge and the structural alignment meet the design requirements, and lays a good foundation for the smooth closure of the bridge. This paper studies the characteristics of the internal force and linear adjustment of the bridge beam during the construction process of hanging basket extension construction, and compares the measured value with the calculated value, analyses and adjusts effectively, and effectively controls the line shape of the bridge. The process of stress variation provides the relevant construction parameters for the construction of similar bridges after the completion of the bridge to meet the design and specification requirements.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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