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长沙市湘江三汊矶大桥主桥为双塔双索面五跨自锚式悬索桥,上部结构采用钢箱梁。项目施工采用新技术,将钢箱梁按照控制线形标高顶推安装就位后用混凝土预制块进行压重,预抬高桥面,无应力安装吊杆后落梁完成体系转换,该法减少了吊杆反复张拉的繁琐程序,施工更简单、直观。通过合理确定钢箱梁的顶升量及顶升施工分级和落梁施工分级,确保了吊杆的顺利安装和吊杆索力的控制,保证了各构件和施工临时结构的安全,解决了新技术中的关键问题,项目取得成功。
The main bridge of the Xiangjiang Sanjianji Bridge in Changsha is a five-span self-anchored suspension bridge with twin towers and a steel box girder used in the superstructure. The construction of the project adopts new technology to compress the steel box girder with concrete prefabricated blocks in accordance with the control line elevation elevation and pre-elevate the bridge deck. Repeated tension of the boom tension program, construction more simple and intuitive. Through the reasonable determination of the lifting amount of steel box girder and the classification of jacking construction and grading of falling girder construction, the smooth installation of the derrick and the control of the derrick force are ensured, the safety of each component and the temporary structure of the construction is ensured, and the new The key issues in technology are the success of the project.