大跨度钢管混凝土系杆拱桥施工控制研究

发布时间：2018-09-02 06:57

【摘要】：钢管混凝土系杆拱桥施工监测与控制是桥梁施工技术的重要组成部分，其任务是对钢管混凝土拱桥施工过程进行预测和控制，确保桥梁在建设过程中结构处于安全与稳定状态，应力和变形始终处于安全范围内，以便成桥后符合设计要求。本文以兰新二线跨乌鲁木齐河1-128m大跨度钢管混凝土系杆拱桥为工程背景，建立施工监测控制体系，对施工控制方法、拱肋拼装技术、施工过程稳定性、钢管混凝土灌注优化、索力测试等展开研究。首先，，回顾了钢管混凝土及钢棍混凝土拱桥的发展和研究现状，介绍了施工控制的主要内容和控制方法，以施工阶段应力、变形、稳定性为控制目标，建立了适合该桥的施工控制体系。其次，采用软件MIDAS/CIVIL建立了考虑施工过程的有限元模型，对主要施工阶段结构应力、变形、稳定性进行了理论分析，预测了各施工阶段结构的变化规律，得出了主要施工阶段结构的稳定性系数和失稳模态。利用该模型，对拱肋混凝土不同灌注方案进行了力学分析。再次，以动态施工控制体系为指导，结合现场实测数据，对施工过程严格进行“双控”，对实测值和理论值进行比较，分析造成差异的原因，在下一个施工阶段予以考虑或改进，使结构状态沿着预定的轨道进行下去，直到成桥后结构各状态达到设计既定目标。通过有限元模型对索力优化计算的基础上，采用频率法对索力进行了测试，完成了初张拉，随后经过第一次调索，索力达到了设计要求。最后，针对乌鲁木齐河大桥拱肋拼装施工方法，介绍了施工工艺流程、安装顺序、设备选择和支架的拆除顺序，对钢管支架的强度、刚度和稳定性进行了计算。给出了每段拱肋的立模标高，并在架设过程中不断纠偏调整，使拱肋顺利合拢。
[Abstract]:The construction monitoring and control of concrete-filled steel tubular tied arch bridge is an important part of bridge construction technology. Its task is to predict and control the construction process of concrete-filled steel tube arch bridge to ensure that the structure of the bridge is in a safe and stable state during the construction process. Stress and deformation are always in the safe range to meet the design requirements after completion of the bridge. In this paper, the construction monitoring and control system is established based on the long span steel tube concrete tied arch bridge of Urumqi River 1-128m across Urumqi River. The construction control method, arch ribbed assembly technology, construction process stability, and the optimization of concrete-filled steel tube (CFST) pouring are established in this paper. The research of cable force test is carried out. Firstly, the development and research status of concrete-filled steel tube (CFST) and steel bar concrete arch bridges are reviewed, and the main contents and control methods of construction control are introduced. The control objectives are stress, deformation and stability in construction stage. The construction control system suitable for the bridge is established. Secondly, the finite element model considering the construction process is established by using the software MIDAS/CIVIL. The stress, deformation and stability of the structure in the main construction stage are theoretically analyzed, and the variation law of the structure in each construction stage is predicted. The stability coefficient and instability mode of the main construction stage are obtained. Using this model, the mechanical analysis of different pouring schemes of arch rib concrete is carried out. Thirdly, under the guidance of the dynamic construction control system, combining with the field measured data, the construction process is strictly controlled by "double control", the measured value and the theoretical value are compared, and the reasons for the difference are analyzed. In the next stage of construction, the state of the structure should be considered or improved so that the state of the structure goes on along the predetermined track until the state of the structure after the completion of the bridge reaches the target of the design. On the basis of the optimization calculation of cable force by finite element model, the cable force is tested by frequency method, and the initial tension is completed. After the first cable adjustment, the cable force meets the design requirements. Finally, aiming at the construction method of arch rib assembly of Urumqi River Bridge, this paper introduces the construction process, installation sequence, equipment selection and removal order of support, and calculates the strength, stiffness and stability of steel pipe support. The elevation of the vertical formwork of each arch rib is given, and the rectifying adjustment is made in the course of erection to make the arch rib close smoothly.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4;U448.225

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