The first part is the general survey of cracks in the floor of six-story platform, which mainly checks whether cracks appear in the floor under long-term load;
The second part is the health status inspection of long-span roof steel structure, mainly to conduct a comprehensive investigation on the health status of long-span roof steel structure;
The third part is the health monitoring of long-span roof steel structure, that is, setting some monitoring instruments to monitor the structural condition of the roof for a long time.