某上跨铁路大跨连续梁桥施工监测与控制研究

发布时间：2018-05-16 09:16

本文选题：桥梁工程 + 大跨连续梁　；参考：《长安大学》2017年硕士论文

【摘要】：为了保证桥梁施工质量和桥梁施工安全,桥梁施工控制是不可缺少的。桥梁施工控制是桥梁建设质量的重要保证措施。通过开展施工监控工作,每种体系的桥梁所采用的施工方法均按预定的程序进行,施工阶段中结构的内力和变形是可以预计的,同时可通过监测手段得到各施工阶段结构的实际内力和变形。论文围绕某上跨铁路大跨度预应力混凝土连续梁桥,跟踪每个施工环节,将施工控制技术成功用于指导生产实践,从而确保大桥顺利施工。(1)首先介绍了桥梁的工程概况,包括设计思路、总体布置。该桥跨径布置为(58+105+58)m,全长为221m,采用悬臂施工的方法。(2)从防电棚设计与施工和挂篮的设计与施工两个方面,总结归纳上跨铁路大跨连续梁施工安全控制。(3)进行了连续梁桥的施工监测与控制实施方案研究,给出了施工监控的依据,以及施工监控的实施过程包括施工仿真分析、阶段划分及测点布置。(4)对连续梁桥结构数值进行分析,研究桥梁结构建模思路,建模方法以及建模的主要过程,给出连续梁桥不同施工阶段下结构的内力及变形分析结果。(5)进行了连续梁桥理论计算值与施工监测结果对比分析,并进行了实测的应力及线形数据规律统计,各施工阶段结构体系变化所产生的拉、压应力(应变)变化,均在允许范围之内,控制目标线形与实测线形吻合较好,基本达到了预期的效果,满足桥面平顺性的要求。(6)分析了混凝土箱梁温度场特点,将实测温度梯度和规范梯度进行对比分析,并计算了最大悬臂状态下的主梁的位移和应力。总结归纳锚下预应力的检测方法和评定依据,对施工阶段的预应力检测结果进行分析。
[Abstract]:In order to ensure bridge construction quality and bridge construction safety, bridge construction control is indispensable. Bridge construction control is an important guarantee of bridge construction quality. By carrying out construction monitoring work, the construction methods used in each system of bridges are carried out according to the predetermined procedures, and the internal forces and deformation of the structures in the construction phase can be predicted. At the same time, the actual internal force and deformation of each construction stage can be obtained by means of monitoring. This paper focuses on a long-span prestressed concrete continuous beam bridge of an upper span railway, tracks every construction link, successfully applies the construction control technology to guide the production practice, thus ensures the smooth construction of the bridge, firstly introduces the general situation of the bridge engineering. Including design ideas, general layout. The span of the bridge is arranged as 58,105,58m, with a total length of 221m.The method of cantilever construction is used in the design and construction of electric sheds and the design and construction of hanging baskets. The construction monitoring and control scheme of continuous beam bridge is studied, the basis of construction monitoring and control is given, and the implementation process of construction monitoring includes construction simulation analysis. Stage division and measuring point arrangement. (4) analyzing the numerical value of continuous beam bridge structure, studying the bridge structure modeling idea, modeling method and main process of modeling. The analysis results of internal force and deformation of the structure under different construction stages of continuous beam bridge are given. (5) the theoretical calculation value of continuous beam bridge and the construction monitoring result are compared and analyzed, and the measured stress and linear data are calculated and analyzed. The variation of tensile and compressive stress (strain) caused by the change of structure system in each construction stage is within the allowable range. The linear shape of the control target is in good agreement with the measured one, and the expected effect is basically achieved. The characteristics of temperature field of concrete box girder are analyzed, the measured temperature gradient and the standard gradient are compared and analyzed, and the displacement and stress of the main beam under the maximum cantilever state are calculated. The test method and evaluation basis of prestress under anchor are summarized, and the test results of prestress in construction stage are analyzed.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4

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