The project is located in Changxing Island, Dalian City, Liaoning Province. The main structure is H-shaped steel column, and the bolt opening at the bottom of the column is U-shaped; The roof truss has a span of 50m and is composed of Q235B angle steel truss. The roof truss of the project has a large span and a large number, and the wind is frequent at the seaside. The hoisting environment is very bad, and the hoisting requirements and difficulties are relatively high.