双塔混凝土自锚式悬索桥施工控制研究

发布时间：2018-10-09 07:35

【摘要】：双塔混凝土自锚式悬索桥在国内应用广泛。此类桥梁最主要的构造特点就是主缆锚固于加劲梁上，施工过程中必须采用先梁后缆的施工步骤，这导致施工过程较为复杂。对此类桥梁的施工控制进行研究具有现实意义。目前，国内外在混凝土自锚式悬索桥施工控制方面的研究主要集中在对某一特定施工阶段的精细化模拟。施工过程的研究主要集中在张拉方案优化和参数敏感性分析等方面，对施工监控过程中的控制细节研究不足，对施工方法的创新不多。本文建立了双塔混凝土自锚式悬索桥的成桥有限元模型，由成桥模型推算了各关键施工阶段的模型，将有限元计算结果与解析法计算结果进行了对比，验证了有限元模型的正确性。在此模型基础上，探讨了依托有限元进行施工模拟及控制存在的问题及解决的方法，分析了不同控制方法的误差。根据工程背景的特点，提出了架设参数求解办法和施工控制方案。将双塔混凝土自锚式悬索桥的张拉过程分成：空缆架设、初张拉、位控过渡、体系转换、局部微调、最终成桥等个六阶段，分析了各阶段的自锚式悬索桥的受力特点和变形特征，有针对性的提出了不同阶段的施工控制目标和特色控制方案，具体为：针对边跨成桥线形高于空缆线形的特点，，提出了先顶再张法和边跨被动张拉法两项施工方案。张拉过程中，为减小位移控制法施工过程中的人为误差，改进了锚头外露量控制法，提出了标记线控制法。体系转换阶段，针对单根吊索张拉力过大特点，提出了一张一补张拉方案。针对双塔混凝土自锚式悬索桥共性特点及小龙湾大桥的个性特点提出了的施工方案，对部分方案及措施进行了改进，提高了施工的精度和施工效率，保证了小龙湾大桥体系转换工作的顺利完成。
[Abstract]:Double-tower concrete self-anchored suspension bridge is widely used in China. The main structural characteristic of this kind of bridge is that the main cable is anchored on the stiffened beam, and the construction procedure of the first beam and then the cable must be adopted in the construction process, which leads to the more complicated construction process. It is of practical significance to study the construction control of this kind of bridge. At present, domestic and foreign research on construction control of concrete self-anchored suspension bridge is mainly focused on the fine simulation of a specific construction stage. The research of construction process mainly focuses on the optimization of tensioning scheme and parameter sensitivity analysis, but the research on control details in construction monitoring process is insufficient, and the innovation of construction method is not much. In this paper, the finite element model of the double tower concrete self-anchored suspension bridge is established, and the models of each key construction stage are calculated from the bridge model. The results of finite element calculation are compared with those of the analytical method. The correctness of the finite element model is verified. On the basis of this model, the problems and solutions of construction simulation and control based on finite element are discussed, and the errors of different control methods are analyzed. According to the characteristics of engineering background, the method of setting up parameters and the construction control scheme are put forward. The tensioning process of double-tower concrete self-anchored suspension bridge is divided into six stages: aerial cable erection, initial tension, position control transition, system conversion, local fine-tuning, and finally bridge, etc. This paper analyzes the stress characteristics and deformation characteristics of self-anchored suspension bridges in different stages, and puts forward the construction control objectives and characteristic control schemes in different stages. The specific contents are as follows: according to the characteristics that the line shape of the side span bridge is higher than that of the empty cable line, Two construction schemes are put forward: first top and second stretch and side span passive tension. In order to reduce the artificial error in the construction process of the displacement control method, the control method of the exposure of the anchor head is improved and the marking wire control method is put forward. In the stage of system transformation, a one-piece-one-patch tension scheme is proposed in view of the excessive tension of a single sling. In view of the common characteristics of double-tower concrete self-anchored suspension bridge and the individual characteristics of Xiaolong Bay Bridge, the construction scheme is put forward, and some schemes and measures are improved to improve the construction precision and construction efficiency. The system conversion of Xiaolong Bay Bridge is guaranteed to be completed smoothly.
【学位授予单位】：南京林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.25

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