采用“先缆后梁”施工方法的自锚式悬索桥施工方案研究  

Study on Construction Scheme of Self-anchored Suspension Bridge with Method of Erecting Cable Before Constructing Girder

作　　者：陆栢坚 王荣辉[1] 甄晓霞[1] LU Baijian;WANG Ronghui;ZHEN Xiaoxia(School of Civil Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510641

出　　处：《甘肃科学学报》2022年第6期62-69,共8页Journal of Gansu Sciences

基　　金：国家自然科学基金面上项目(51678247)。

摘　　要：以东江南支流港湾大桥为背景工程,研究设置临时锚锭的自锚式悬索桥“先缆后梁”施工方法。利用有限元软件对桥梁施工过程进行分析。结合“先缆后梁”施工方法的特点,采用梁段间临时绞连接,边跨段与支架段分离的主梁连接方法;通过对比不同方案,确定在边跨吊装4个节段后,进行支架段与边跨间合拢段的吊装;设置6个临时拉索张拉步骤,可有效平衡主缆的水平力,同时保证辅助墩的受力安全。辅助墩最大拉应力为1.00 MPa;通过设置梁面压重水袋可有效控制主塔应力,避免主缆滑移。主塔最大拉应力为1.65 MPa,塔顶位移控制在±16.0 cm内。施工方案的确定过程可为同类型桥梁施工提供参考。Taking Harbour Bridge across south tributary of Dongjian River as the background project, the construction method of erecting cable before constructing girder for self-anchored suspension bridge with temporary anchor is studied.The finite element software is used to analyze the bridge construction process.Combined with the characteristics of erecting cable before constructing girder construction method, the main beam connection method of temporary hinge connection between beam sections and separation of side span section and support section is adopted.By comparing different schemes, the closure segment between the support segment and the side span is lifted after lifting four segments of the side span.6 temporary cable tensioning steps are set to effectively balance the horizontal force of the main cable and ensure the force safety of the auxiliary pier.The maximum tensile stress of auxiliary pier is 1.00 MPa and the stress of the main tower could be effectively controlled and the slip of the main cable could be avoided by setting the water bag on the beam surface.The maximum tensile stress of the main tower is 1.65 MPa, the top displacement of the tower is controlled within ±16.0 cm.The determination process of construction scheme could provide reference for the construction of similar bridges.

关 键 词：自锚式悬索桥 临时锚锭 主缆滑移 钢箱梁 施工方案 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]