连续刚构桥线形控制关键技术研究

发布时间：2018-03-08 22:32

本文选题：连续刚构桥　切入点：线形控制　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着连续刚构桥悬臂浇筑法施工的广泛应用,施工过程控制显得尤为重要。施工控制的好坏直接影响成桥的线形和内力状态,同时还会影响桥梁建成以后的使用寿命。本文以云南一连续刚构特大桥为依托,在查阅大量文献的基础上主要介绍了连续刚构桥的发源、施工过程控制的意义以及悬臂施工控制理论,其包括施工控制所采用的方法和内容;然后以工程实例来说明施工过程中的一些关键技术,如施工监控方案的拟定、施工控制的理论计算、施工过程中挂篮荷载试验的实施以及施工控制的要求。在连续刚构线形控制中可以通过计算立模标高来保证每个节段的浇筑与设计相靠近,而其中挂篮变形值占有很大的地位,所以本文针对挂篮变形值进行了详细研究。由于之前施工过程中对于挂篮变形值都是采用线性内插值,而此种方法不能真实的反应挂篮的实际变形值。本文提出了一种可以通过理论计算结合结构力学分析而拟合出一个数学公式的方法,并将其同实测值进行对比,对比结果表明此种方法比原来的线性内插值更接近真实值,从而为以后连续刚构线形控制提供参考。文章最后一章对实际施工过程中出现的桥面调平层厚度调整问题进行了研究。尽管在施工过程中进行了严格的过程控制,但是由于各种各样的因素,在桥梁合拢以后,桥面高程与设计目标高程仍然存在着偏差,为了不影响桥梁的平顺性,就需要对桥面调平层进行拟合以防止局部凸起或凹陷。此处重点介绍了用余弦曲线来拟合桥面调平层厚度和分跨拟合桥面调平层厚度,并依据实桥数据进行了计算,最后得出分跨拟合调平层更能满足桥面的平顺性的结论。本文通过对连续刚构桥线形控制进行研究,得出了挂篮变形值预估的改进方法,同时分析了桥面调平层的拟合方法,为更准确的控制最终成桥线形奠定了基础,同时为以后连续刚构桥悬臂施工技术的改进提供一定的参考。
[Abstract]:With the wide application of the continuous rigid frame bridge cantilever construction method, construction process control is very important. The construction control has a direct impact on the bridge alignment and stress state, and the service life will affect the bridge after the completion of Yunnan. This paper takes a continuous rigid frame bridge as the basis, based on the literatures are mainly introduced the origin of the continuous rigid frame bridge, construction process control and the significance of the cantilever construction control theory, which includes the content and method of construction control is adopted; then with engineering examples to illustrate the construction process of some key technologies, such as the formulation of construction scheme, construction control calculation theory, the implementation of load test during the construction of hanging basket the requirements and construction control. In the linear control can be obtained by calculating the elevation of formwork to ensure the pouring and design of each segment is close to the continuous rigid frame, and The deformation of the hanging basket occupies a large place, so the deformation of the hanging basket is studied. Because of the construction process for deformation of the hanging basket is using linear interpolation, the actual deformation and this method could not reflect the true value of the hanging basket. This paper presents a theoretical calculation analysis the method of fitting a mathematical formula of structural mechanics, and the measured values are compared, results show that this method is more close to the true value than the original linear interpolation, so as to provide reference to the linear control of continuous rigid frame. The last chapter is the research on the adjustment of the deck leveling layer thickness in the actual construction process. Although in the construction process of strict process control, but due to various factors, in the bridge after closure, and the design objective of high bridge elevation The process still exists deviation, in order not to affect the smoothness of the bridge, we need to bridge the leveling layer are fitted to prevent local uplift or depression. The key points of using cosine curve to fit the deck leveling layer thickness and cross deck fitting leveling layer thickness, and on the basis of real bridge data were calculated, finally the cross fitting leveling layer can meet the comfort of the bridge. The conclusion based on the research of control of continuous rigid frame bridge, the improved method of deformation prediction value of hanging basket, and analyzed the fitting method of deck leveling layer, laid the foundation for a more accurate control of the final bridge line, at the same time after the improved technology of cantilever construction of continuous rigid frame bridge to provide a reference.

【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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