京包铁路分离式立交转体桥施工控制技术研究

发布时间：2018-02-27 18:08

本文关键词： T构桥转体施工仿真模拟应力监测线形控制不平衡力矩　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着大规模基础设施建设，将不可避免地出现新建桥梁跨越既有路线，特别是跨越高速公路、高速铁路等重要路线。为尽可能减小桥梁施工对线下运营的影响，同时保证线路交叉的安全和经济适用，转体方法施工的桥梁逐步增加。京包铁路分离式立交桥为跨越京包铁路的一座大桥，跨径为2×75m，结构形式为预应力混凝土变截面T型刚构桥，首先采用平行铁路搭设支架现浇施工，然后平行转体跨越铁路，转体角度为62.5度。本文依托京包铁路分离式立交桥的转体施工，通过有限元仿真分析和现场施工监控以及转体过程监测研究，说明京包铁路分离式立交桥转体施工控制的关键技术的解决方案，为其它类似桥梁的施工控制提供借鉴。本文主要研究内容如下：（1）介绍转体施工的有关原理及方法，以及施工控制的主要流程，从而确定本文的主要研究内容。（2）根据京包铁路分离式立交桥转体施工的特点，，分析施工过程模拟计算的重点和难点，采用MIDAS Civil软件进行空间建模分析，确定合理成桥状态以及施工阶段的线形和应力结果，以便指导现场施工，同时运用Abaqus软件建立球铰构造细部分析模型，对球铰受力状态进行分析。（3）介绍T型刚构转体桥线形监控控制原理，提供预拱度指令指导现场施工，同时根据施工实际对有关线形控制参数进行监测，得出线形控制的有关结论。（4）介绍T型干够转体桥控制断面的应力监测方法，传感器布置要点，同时根据施工过程中监测重点断面的应力数值，确保施工过程安全。（5）介绍京包铁路分离式立交桥转体施工监测监控技术，重点介绍下转盘应力监测、墩柱底部应力监测、T构不平衡力矩测试、转体过程监测的原理及方法，保证转体安全顺利进行。综上，通过对京包铁路分离式立交桥转体施工控制技术研究，研究结果和结论可以为同类桥梁设计、施工及运营管理等部门提供指导，并进行相应的优化管理。
[Abstract]:With the large-scale infrastructure construction, it is inevitable that new bridges will cross the existing routes, especially the highway, high-speed railway and other important routes. In order to minimize the impact of bridge construction on off-line operation, At the same time, the safety and economic applicability of the crossing are ensured, and the number of bridges constructed by the rotation method is gradually increased. The separated interchange of Beijing-Baotong Railway is a bridge spanning Beijing-Bao-Baotong Railway with a span of 2 脳 75m.The structure is a T-type rigid frame bridge with prestressed concrete variable cross-section. First, the cast-in-situ construction of the support is used for parallel railway construction, and then the parallel rotation is used to cross the railway. The angle of rotation is 62.5 degrees. Based on the rotary construction of the separated interchange of Beijing-Bao-Baotong Railway, this paper explains the solution of the key technology of the construction control of the separated overpass of Beijing-Bao-Baotong Railway through finite element simulation analysis, on-site construction monitoring and monitoring research on the rotation process. The main contents of this paper are as follows:. 1) introduce the principle and method of rotary construction, and the main flow of construction control, and confirm the main research contents of this paper. 2) according to the characteristics of rotary construction of separated interchange bridge of Jingbao railway, the emphasis and difficulty of simulation calculation of construction process are analyzed, and the spatial modeling analysis is carried out by using MIDAS Civil software to determine the reasonable state of the bridge and the results of alignment and stress in the construction stage. In order to guide site construction and use Abaqus software to establish the detailed analysis model of spherical hinge structure, the stress state of ball hinge is analyzed. This paper introduces the principle of linear monitoring and control of T-type rigid frame rotary bridge, and provides the instruction of pre-camber to guide the field construction. At the same time, according to the actual construction practice, it monitors the parameters of the linear control, and draws the relevant conclusions of the linear control. This paper introduces the stress monitoring method of the control section of T type dry enough rotary bridge and the main points of sensor arrangement. At the same time, according to the stress value of the key section monitored during construction, the safety of construction process is ensured. This paper introduces the monitoring and monitoring technology of the rotary construction of the separated interchange bridge of Beijing-Bao railway, with emphasis on the stress monitoring of the lower turntable, the stress monitoring on the bottom of the pier column and the testing of the unbalance moment of the T structure, and the principle and method of the monitoring of the rotation process. To ensure the safe and smooth running of the rotation. In summary, through the research on the construction control technology of the separated interchange bridge of Beijing-Bao-Baotong Railway, the research results and conclusions can provide guidance for the similar departments of bridge design, construction and operation management, and carry on the corresponding optimization management.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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