The assembly of the floating roof steel structure starts from the center of the tank, and the assembly of the floating roof steel structure is carried out in turn, starting from the center. If the inspection is qualified, the assembly of the floating roof steel structure shall be carried out in strict accordance with the drawings, and the deformed steel structure parts shall be adjusted in time. When assembling the outer flange of the floating roof, the verticality shall be ensured, and the assembly radius shall be enlarged appropriately to ensure that it and the wall panel Between the seal gap.