下承式钢箱提篮拱桥拱肋拼装支架方案研究  

COMBINED CONSTRUCTION OF ARCH RIB INCLINED SUPPORT AND VERTICAL SUPPORT OF THROUGH STEEL BOX BASKET HANDLE TIED ARCH BRIDGE

作　　者：周艇[1] ZHOU Ting(China Railway 18th Bureau Group Second Engineering Co.,Ltd.,130200,Tangshan,Hebei,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山130200

出　　处：《建筑技术》2024年第14期1672-1675,共4页Architecture Technology

摘　　要：以绵阳科技城大道涪江大桥为工程背景,采用数值模拟对拱肋的拼装支架方案进行比选。针对直立支架与斜支架方案,分别建立了有限元模型,分析了施工过程中结构的稳定性。结果表明,采用直立支架拼装拱肋,拱肋易发生侧向失稳,不满足工程要求。研究采用斜支架,因其结构稳定性较好,关键施工阶段的稳定系数均大于4.0,满足要求。依据稳定性分析结果,同时考虑2种方案的施工难易程度,进一步提出了斜支架与直立支架组合的方式进行拱肋拼装,并介绍了该方案的施工要点及流程。采用此方法,成功完成了涪江大桥的拱肋拼装。Taking the Fujiang Bridge on Mianyang Science and Technology City Avenue as the engineering background,the numerical simulation is used to compare and select the assembly support scheme of the arch rib.For the vertical support and inclined support scheme,the finite element models are established respectively,and the stability of the structure during the construction process is analyzed.The results show that the vertical support is used to assemble the arch rib,and the arch rib is prone to lateral instability,which does not meet the engineering requirements.The stability of the structure is good,and the stability coefficient of the key construction stage is greater than 4.0,which meets the requirements.According to the results of stability analysis and considering the difficulty of construction of the two schemes,the combination of inclined support and vertical support is further proposed for arch rib assembly,and the construction points and process of the scheme are introduced.Using this method,the arch rib assembly of Fujiang Bridge was successfully completed.

关 键 词：拱肋施工 斜支架 直立支架 稳定性 数值分析 

分 类 号：TU997[建筑科学—市政工程]