高墩大跨预应力混凝土连续刚构桥的施工控制研究

发布时间：2018-01-15 23:34

本文关键词：高墩大跨预应力混凝土连续刚构桥的施工控制研究　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着新工艺、新设备、新材料和新的设计手段的开发与应用,预应力混凝土连续刚构桥凭借其施工方便、线形美观以及跨越力大的特点在大跨桥梁中应用得越来越广泛。大跨连续刚构桥的施工方法一般采用平衡悬臂浇筑法。在进行悬臂施工的过程当中,结构必然会受到诸多因素对它的影响,比如控制参数存在的误差、施工存在的误差、测量存在的误差以及砼的收缩徐变、温度变化等等。在施工阶段中随着桥梁结构和荷载状态的不断变化,结构的内力以及变形将随之不断地发生变化,并且所产生的变化幅度比较大。为保证施工质量和桥梁建设过程中的安全,必须对桥梁的结构内力分布和成桥线形进行监控,这就是桥梁施工控制的内容。本文结合天桥特大桥这个实际工程,对连续刚构桥的施工关键技术问题进行研究,同时考虑到本桥承台混凝土为大体积混凝土,故进而对大体积混凝土的水化热温度监控问题进行研究,探讨承台冷却系统布置的可行性。本文重点对该桥悬臂施工过程中的线形控制和应力控制进行研究,把施工控制理论具体运用到工程实践进行了分析,同时采用桥梁结构分析软件MIDAS/CIVIL对全桥进行逐段施工仿真模拟分析,作为各施工阶段进行调整控制的依据。数值分析计算结果确定了成桥预拱度以及施工预拱度,最后得到了总的预拱度理论分析值,确定了立模标高的计算公式,通过与实际监测结果进行对比,说明了计算结果的正确性。在应力控制中,由软件分析计算,得到了各施工阶段结构的理论应力值,通过与实际监测结果进行对比基本吻合,达到了对该桥应力控制的目标。
[Abstract]:With the development and application of new technology, new equipment, new materials and new design means, prestressed concrete continuous rigid frame bridge is easy to construct. Long span continuous rigid frame bridge construction method generally adopts the balanced cantilever pouring method. In the process of cantilever construction. The structure is bound to be affected by many factors, such as the error of control parameters, the error of construction, the error of measurement and the shrinkage and creep of concrete. With the continuous change of the bridge structure and load state, the internal force and deformation of the structure will change continuously in the construction stage. In order to ensure the construction quality and the safety in the process of bridge construction, it is necessary to monitor the distribution of the internal force of the bridge structure and the alignment of the bridge. This is the content of bridge construction control. This paper studies the key technical problems of continuous rigid frame bridge construction, considering that the concrete of the bridge cap is mass concrete. Therefore, the hydration heat temperature monitoring of mass concrete is studied, and the feasibility of cap cooling system arrangement is discussed. This paper focuses on the linear control and stress control during the cantilever construction of the bridge. The construction control theory is applied to the engineering practice and the bridge structure analysis software MIDAS/CIVIL is used to simulate the whole bridge construction step by step. As the basis of adjustment and control in each construction stage, the numerical analysis results determine the pre-arch degree of the bridge and the pre-arch degree of construction. Finally, the theoretical analysis value of the total pre-arch degree is obtained, and the calculation formula of the elevation of the vertical formwork is determined. By comparing with the actual monitoring results, the correctness of the calculation results is illustrated. In the stress control, the theoretical stress values of the structures in each construction stage are obtained by the software analysis and calculation. By comparing with the actual monitoring results, the goal of stress control of the bridge is achieved.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.23

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