【作者】 谢洪波；

【导师】 金伟良； 陆耀忠；

【作者基本信息】 浙江大学 ， 建筑与土木工程， 2010， 硕士

【摘要】 随着我国高速公路的快速发展以及城市化进程的加快,公路立体交叉桥、互通区、枢纽的匝道桥、城市立交桥和高架桥等现浇形式的桥越来越多,在施工方法上多采用钢管支模架支撑现浇的工艺。碗扣式钢管支架因其良好的性能特点,成为我国目前桥梁施工中主要的支架形式。但是由于该结构体系设计理论的不足,与之匹配的技术规范的滞后和不完善,再加上施工管理和材料质量等方面的缺陷,导致近年来碗扣式脚手架和支模架在桥梁施工中不断发生坍塌事故。因此对碗扣式钢管支架进行分析和研究,具有重要的实际意义。本文的主要研究内容如下:通过大量的调研和收集钢管支模架在桥梁施工中的事故实例,分析总结引起事故的原因,并针对性地提出预防事故的对策和措施;对桥梁施工中常用的三种支架的优缺点进行了分析比较,对碗扣式钢管支架的性能特点作了介绍,提出了实际工程中选择应用新型脚手架支撑系统应遵循的基本原则和支架系统搭设方案,对特殊条件下的搭设方法进行了研究说明;对现行的碗扣式规范进行了研究,指出了其不合理或不足之处,并提出了改进的建议;对支架预压和预拱度设置进行了研究,结合桥梁施工支模架预压的目的,提出预压荷载和预压加、卸载方式,并引入工程实例验证;分析了作用在支架系统上的各种荷载,确定了荷载计算方法,使用ABAQUS有限元程序建立空间立体模型,模拟支模架受力情况,结合工程实例,对支模架进行了设计计算,保证了桥梁支模架施工安全,对此类结构的支模架设计和施工提供了借鉴参考的经验和思路。更多还原

【Abstract】 With the rapid development of highway and the acceleration of urbanization progress in China , more and more types of cast-in-situ bridges have been built ,such as spatial cross bridges on the highway , ramp bridges in traffic hinge, overpasses and trestles in cities and so on, which were supported by formwork-supporting systems during their construction periods . With its outstanding performance , cuplock joint scaffold has been the mainly used supporting system in our country . However , there have been a large number of collapse accidents of the cuplock joint scaffold and the supporting system in recent years , most of which were caused by the insufficiency of the design theory , imperfection of the Technical Specification and the faults in construction management and materials . Thus ,there will be of great practical significance to do research in this field.The main contents in this paper are as below : After a extensive collection and research of the accidents , this paper summarized causations of these accidents and brought forward some measures . The advantages and disadvantages of three normally used type of scaffold have been discussed, after that, the performance of the cuplock joint scaffold has been introduced , the fundamental principles and erection program for application of new type supporting system have been presented, and a research about erection programs under special conditions has been finished .Based on a study about the present specification of cuplock joint scaffold , several unreasonable and insufficient issues have been pointed out, and some pieces of suggestions have been presented. According to a research about precamber of the bridges , the number of prepressing , the ways to load and unload have been presented combining the purpose of prepressing , then all of these were validated against a practical project. The loads imposing on the scaffold have been analysed and the method for load calculation has been determined . A numerical model has been established , through which the simulation of the response to loads and safety calculation have been done . Based on the researches described previously , the write is hoping to provide some experience and solutions for the design and construction of cuplock joint scaffold.更多还原