西宁机场新建T3航站楼中央C区网架施工关键技术OA

Steel grid structures are widely employed in large-scale public buildings owing to their advantages of large span and low self-weight.The steel grid structure in central zone C of the newly built terminal 3(T3)building at Xining Airport has the characteristics of large span,significant elevation difference,heavy self-weight,and long cantilever,which poses considerable construction challenges.Addressing construction challenges,an innovative combined lifting technology integrating"multi-stage expansion cumulative lifting"and"virtual axis+vertical rotational lifting"was adopted,which boasts multiple advantages including high efficiency,precision,and safety.Prior to construction,SAP2000 software was utilized for modeling and analysis to obtain key data such as structural stress and deformation,thereby providing reliable support for the construction scheme.The multi-stage expansion cumulative lifting technology,through three-level aerial stagnation and lifting in the order of high stage first and low stage second,resolves the problem of staggered-floor construction,substantially reduces high-altitude operations and the usage of temporary support frames,and shortens the construction period.The virtual axis technology,by deriving equations to determine the optimal rotation axis,breaks through the limitations of traditional technologies and achieves precise installation of the hyperboloid grid.This technology provides reliable reference for the construction of steel grid structures in large-scale public buildings such as stadiums and exhibition centers,and has significant promotional value.