大跨变截面连续钢箱梁整跨架设技术研究

发布时间：2018-03-25 23:56

本文选题：大节段钢箱梁　切入点：起重船　出处：《重庆交通大学》2015年硕士论文

【摘要】：《大跨变截面连续钢箱梁整跨架设技术研究》依托位于长江入海口的江苏省崇启长江公路大桥工程,针对大跨度变截面连续钢箱梁整跨架设所面临的技术难题,其中包括总体架设方案、整体吊装、现场调位、接缝连接等；采用工程调研、理论分析、数值模拟、现场试验等多种方法,系统地开展了以下三个方面的研究：通过两种方案的对比分析,提出工厂整跨制作-现场吊装的施工方案；开展了不同安装顺序及合拢方案的研究,提出了边跨合拢工艺和确保结构内力满足设计要求的调控措施。在进行国内大型起重船调研的基础上,建立起重船选型系统,拟定了满足吊重和吊高要求的大型起重船及组合方案；进行了大型起吊吊索具系统研究,提出结构轻颖、受力合理的自平衡吊索具系统,并建立新型吊索具的计算方法和设计原则。在分析桥区水文历史资料和现场测试资料的基础上,提出了起重船应布置在上游进行吊装；针对架设参与船舶多、锚缆系统复杂的特点,研究了合理的船舶布置方案。根据墩顶结构形式及墩顶空间,开展了墩顶处调位系统研究,提出了结合永久支座的三向调位系统,实现了钢箱梁墩顶处的三向调位；展开了钢箱梁接缝间调位系统研究；提出了集结构连接和调位系统于一体的牛腿构造。由于在安装过程中各种误差的累计,会造成接缝间产生较大误差,为保证接头顺利连接,提出了压重、底板接缝处临时对拉、支座升降等现场调控措施；由于待安装梁与已安装梁间采用栓焊连接方式,需要对栓接与焊接工序安排及连接工艺进行研究,确保接头质量。本文系统地研究了长185m、重2690吨的钢箱梁大节段的整体安装调位等关键技术难题,研究成果为国内近海恶劣环境下的大规模钢箱连续梁桥建设起到示范和指导作用。
[Abstract]:Based on the project of Chongqi Yangtze River Highway Bridge in Jiangsu Province located at the mouth of the Yangtze River, this paper aims at the technical problems faced by the erection of long span continuous steel box girder with variable cross section. These include the overall erection scheme, integral hoisting, site adjustment, joint connection, and so on; the use of engineering research, theoretical analysis, numerical simulation, field testing and other methods, The following three aspects are systematically studied: through the comparison and analysis of the two schemes, the construction scheme of the whole span production and on-site hoisting of the factory is put forward, and the research on the different installation sequence and closure scheme is carried out. The technology of side span closure and the control measures to ensure that the internal forces of the structure meet the design requirements are put forward. Based on the investigation and investigation of large lifting ships in China, the selection system of lifting ships is established. In this paper, a large crane ship and its combination scheme which meet the requirements of lifting weight and lifting height are worked out, and the system of large lifting slings is studied, and the self-balancing sling system with light structure and reasonable force is put forward. Based on the analysis of hydrological historical data and field test data in the bridge area, it is proposed that the lifting ship should be arranged upstream for hoisting, in view of the large number of ships involved in the erection of the crane, the calculation method and the design principle of the new type of slings are established. According to the structure form of pier top and the space of pier top, the adjustment system at the top of pier is studied, and a three direction position adjusting system combined with permanent support is put forward, which is based on the complex characteristics of anchor and cable system. The three direction adjustment at the top of the steel box girder pier is realized; the research on the system of adjusting position between the joints of the steel box girder is carried out; and the corbel structure which integrates the structural connection and the alignment system is put forward. Because of the accumulative errors in the installation process, In order to ensure the smooth connection of the joint, the field control measures, such as pressing weight, temporary drawing at the bottom joint, lifting and lifting of the support, are put forward, since the connection between the beam to be installed and the installed beam is by way of bolting welding. It is necessary to study the arrangement and process of bolting and welding to ensure the quality of joint. In this paper, the key technical problems, such as the integral installation and adjustment of the large segment of steel box girder with a length of 185 m and a weight of 2690 tons, are systematically studied. The research results play a role in demonstration and guidance for the construction of large scale steel box continuous girder bridge in the harsh offshore environment.
【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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