Abstract：
Four-frame primary truss and 12-frame assistant truss were used in a project. The truss span is 34 m and the largest truss has a weight of 45 t. Considering the heavy structure weight and high installation position, hydraulic lift was used to lift the whole truss to reduce the high-altitude construction workload and installation difficulty. The maximum down-warping deflection is about 5.8 mm and the maximum stress ratio of lifting bar is about 0.48, which could satisfy the lifting requirements; the maximum stress of the lift is about 223MPa and the maximum deformation is about 0.33mm, which could also meet the lifting requirements. The maximum down-warping deflection of the midspan of three-frame truss is about 9.6mm, the stress ratio of structural member is less than 0.5 and maximum lifting reactive force is about 451kN; during single truss lifting, the maximum deformation is about 3.3 mm and member stress ratio is less than 0.5, satisfying the lifting requirements.
