公铁两用桥防护棚架设计与快速施工技术研究

Research on Structure Design and Rapid Construction Technology of Protective Isolation Scaffolding for Highway-railway Bridge

为保障在不中断铁路正常运行的情况下进行公铁两用桥公路桥面升级改造,防护隔离技术应运而生,伴随着这项技术的发展,如何在有限的天窗点内实现防护隔离棚架的快速施工成为一个新的课题。结合九江长江大桥和南京长江大桥公路桥面升级改造工程,从既有公铁两用桥梁的边界条件及棚架结构功能方面进行分析,对棚架结构的整体性设计、分块化设计以及各主体结构的快速施工技术进行研究,提出了一套在天窗点内实现防护隔离棚架快速施工的技术。

Due to the upgrading and reconstruction of the deck for the highway-railway bridge will be carried out without interruption of normal operation of the railway, the protective isolation technology arises at the historic moment. However, how to achieve the rapid construction of the shed frame within the definite reserved construction and maintenance period has become a new issue. In this paper, the study of the integrated design, partitioned design of the shed frame structures and the rapid construction of the main structures will been carried out based on the analysis of the boundary conditions of the shed frame structures as well as the construction technologies of the existing combined highway and railway bridges in combination with the upgrading and reconstruction of the Jiujiang Yangtze River Bridge and Nanjing Yangtze River Bridge to form a complete set of new technologies.