梁式桥结构顶升关键技术研究

发布时间：2018-01-04 00:22

本文关键词：梁式桥结构顶升关键技术研究　出处：《重庆交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：近年来桥梁顶升改造工程越来越多。桥梁顶升是一项技术要求高、设计施工难度大、过程控制难度大的新兴施工技术，开展梁式桥顶升关键技术研究对保障施工过程安全及质量具有重要意义。本文针对连续梁桥，首先提出适宜的同步顶升系统及流程，并以成都市二环路交大立交桥顶升工程作为依托工程，主要从顶升系统构成中钢支撑托架系统的选用、限位系统设计、顶升液压系统的选择以及顶升施工流程等几个方面来进行研究；然后根据顶升支撑结构特点，并通过有限元软件验算拟定出适用于依托工程的支架系统，主要从支架系统的安全性、合理性和经济性几方面进行对比分析，提出适用于多跨连续梁桥顶升施工标准化的支撑体系；其次对依托工程的上部结构进行仿真模拟分析，，主要对梁体处于正常顶升状态、超顶现象和千斤顶失效状态的受力进行分析；然后对交大立交桥顶升过程监控的内容设计和测点布置进行分析，通过对其顶升过程中的应力、位移、裂缝和稳定系数等关键监控项的实测数据进行分析研究；最后根据国家规范验证依托工程在本次无损顶升改造施工过程中的可行性和可靠性。通过分析结果表明：本文提出的连续梁桥同步顶升系统及流程在依托工程中的应用情况良好。有限元软件分析结果表明：文中提出的八个钢管支撑对称布置方式比六个钢管钢支撑对称布置方式的更合理，顶升过程中不会产生附加内力而影响结构安全；在顶升过程梁体出现整体位移误差和倾斜位移误差时，中间墩比边墩因偏差产生的附加内力和拉、压应力都较大,因此在顶升过程中对中间墩进行严格控制，重点监测和调整。工程过程监控及应用情况表明：整个顶升过程中梁体变形和顶升高度误差在预警值及限值之内，符合要求；梁体和钢管支撑顶升过程中的受力情况良好，未出现任何病害，承台无异常沉降，本次顶升的施工质量、安全和工期都达到了预期效果。本文根据连续梁桥顶升的关键技术做出了比较全面可靠的分析研究，为今后梁式桥结构的顶升施工工程提供了设计和施工依据，也为今后编制顶升改造施工规范提供了实例依据。
[Abstract]:In recent years, there are more and more bridge uplift reconstruction projects. Bridge jacking is a new construction technology with high technical requirements, great difficulty in design and construction, and difficulty in process control. It is of great significance to carry out the research on the key technology of beam bridge uplift to ensure the safety and quality of the construction process. Aiming at the continuous beam bridge, this paper first puts forward the suitable synchronous lifting system and flow, and relies on the lifting project of the second Ring Road overpass in Chengdu. This paper mainly studies the selection of support bracket system, the design of limit system, the choice of hydraulic system and the construction process of lifting system. Then according to the characteristics of the jacking support structure and through the finite element software check calculation to draw up the support system for the support project, mainly from the security, rationality and economic aspects of the comparative analysis of the support system. A support system suitable for the standardization of lifting construction of multi-span continuous beam bridges is proposed. Secondly, the superstructure of the supporting engineering is simulated and analyzed, which mainly analyzes the force of the beam body in the normal lifting state, the phenomenon of overtopping and the failure state of the Jack. Then it analyzes the content design and measuring point arrangement of the monitoring of the uplift process of Jiao Tong University overpass, and analyzes and studies the measured data of key monitoring items such as stress, displacement, crack and stability coefficient in the process of uplift. Finally, the feasibility and reliability of the supporting project in the construction process of the non-destructive uplift retrofit are verified according to the national code. The results of analysis show that the synchronous lifting system and flow of continuous beam bridge presented in this paper are well applied in the supporting engineering. The finite element software analysis results show that:. In this paper, the symmetrical arrangement of eight steel tube braces is more reasonable than that of six steel tubes. The safety of the structure will not be affected by the additional internal force in the process of jacking. When there are integral displacement error and inclined displacement error in the uplift process, the additional internal force and tension and compressive stress caused by the deviation of the middle pier than the side pier are larger, so the middle pier is strictly controlled during the uplift process. The monitoring and application of engineering process show that the errors of beam deformation and elevation are within the early warning value and limit value, which accord with the requirements; Beam and steel pipe support during the uplift process of the force is good, there is no disease, no abnormal settlement of the cap, the construction quality of this uplift. According to the key technology of continuous beam bridge jacking, this paper makes a more comprehensive and reliable analysis and study, which provides the design and construction basis for the construction of beam bridge structure jacking in the future. It also provides an example basis for compiling the construction code of uplift reconstruction in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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