宽幅矮塔斜拉桥悬臂施工关键技术研究

发布时间：2018-07-03 08:46

本文选题：三角形挂篮 + 宽幅箱梁　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：随着斜拉桥设计和施工技术的飞速发展,矮塔斜拉桥作为连续桥梁和斜拉桥之间的一种新桥型,逐步进入桥梁研究人员的视野,其设计理论和施工技术日渐成熟和完善。正是由于矮塔斜拉桥的经济性和美学景观等特点,得到了广大桥梁设计人员的青睐,国内桥梁建设中采用这种桥型的越来越多,尤其是在城市市政桥梁建设中得到了广泛的应用。本文以陈村大桥为工程背景,重点研究了宽幅矮塔斜拉桥箱梁挂篮悬臂浇筑施工关键技术。首先,根据本工程具体特点设计了悬臂施工三角形挂篮,介绍了三角形挂篮的工作原理,利用midas软件对整个结构进行了受力验算,从强度、刚度和稳定性三个方面验证了矮塔斜拉桥三角形挂篮悬臂浇筑的适应性;其次,对矮塔斜拉桥主梁挂篮悬臂施工关键技术进行了研究分析,结合矮塔斜拉桥主梁挂篮悬臂浇筑工程实例,对三角形挂篮安装及试验、主梁悬臂浇筑施工工艺、主梁模板安装、钢筋绑扎、混凝土浇筑和养护、预应力的施加与孔道压浆等关键施工技术进行了仔细研究,解决了施工中的关键技术难题。第三,对主梁在施工中的线型和内力进行了适时监控,指导挂篮前移就位,并确定箱梁模板安装标高,确保桥梁施工安全和成桥后主梁的线形和内力满足设计要求。
[Abstract]:With the rapid development of cable-stayed bridge design and construction technology, as a new type of bridge between continuous bridge and cable-stayed bridge, the design theory and construction technology of the cable-stayed bridge are gradually becoming mature and perfect. Because of the economic and aesthetic features of the cable-stayed bridge with low tower, it has been favored by the vast number of bridge designers, and more bridges are used in the construction of domestic bridges. Especially in the city municipal bridge construction has been widely used. Taking Chencun Bridge as the engineering background, this paper focuses on the key construction technology of box girder cantilever construction of wide and low tower cable-stayed bridge. First of all, according to the specific characteristics of this project, the cantilever construction triangle hanging basket is designed, the working principle of the triangle hanging basket is introduced, and the force of the whole structure is checked by using midas software. Three aspects of stiffness and stability verify the adaptability of cantilever construction of triangle hanging basket of low tower cable-stayed bridge. Secondly, the key construction technology of cantilever construction of main girder of low tower cable-stayed bridge is studied and analyzed. Combined with the example of cantilever casting of main girder of cable-stayed bridge with low tower, the installation and test of triangle hanging basket, the construction technology of cantilever pouring of main beam, the installation of main beam formwork, the binding of steel bar, the pouring and maintenance of concrete, etc. The key construction techniques, such as the application of prestress and the grouting of holes, are studied carefully, and the key technical problems in construction are solved. Thirdly, the alignment and internal force of the main beam in the construction are monitored in time, guiding the forward position of the hanging basket, and determining the installation elevation of the box girder formwork, so as to ensure the safety of the bridge construction and the alignment and internal force of the main girder after the completion of the bridge to meet the design requirements.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27

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