English：

After the construction of the main structure of the north and south parking building of aninternational airport project, it is necessary to use a 50t truck crane to dismantle the tower crane. Due tothe restrictions of the location of the tower crane and the site environment, the driving route and liftingarea of the truck crane are located in the overhead area reserved for the long term. The load is far beyondthe original design bearing capacity, and the original structural system cannot meet the bearing capacityrequirements. By dispersing the concentrated load of the steel plate, the overhead layer and its lowerlayer were arranged in the topping support frame body. The finite element software was used to establishthe overall cooperative force analysis model of the main structure and the topping support system, and thebearing capacity was calculated. The finite element analysis results were combined with the theoreticalcalculation to verify the feasibility and safety of the topping support scheme. Finally, the input of thetopping support system resources has been further optimized, thereby reducing the construction cost.