English：

The steel structure of terminal T3B hall roof of Chongqing Jiangbei Airport is a special-shapedthree-dimensional curved welded spherical grid. Due to the non-stop flight of the surrounding aircraft,plus its complex structure, large structural height difference, large span, large number of rods and otherfactors,it brings great challenges and difficulties to the roof steel structure construction. Based on schemediscussion and expert evaluation , this paper proposes an optimized construction scheme, the steel roof ofthe hall is divided into seven lifting zones, each zone is assembled into small lifting blocks on the floor,and the construction is carried out through secondary and multiple cumulative lifting. Before construction,BIM technology is used for process rehearsal, and 3D3S, MIDAS Gen software are used for numericalsimulation analysis to provide strong support for the accuracy and safety of construction.