Heavy steel grating is characterized by its large load-carrying capacity and strong impact resistance. It is recommended to use toothed steel grating, which can provide better friction. The press lock is a good manufacturing method, which can effectively prevent the tilting instability of the bearing flat steel. Avoid deformation of the loaded flat bar. The requirements for galvanizing are also very strict. When the thickness of the load-bearing flat steel is not less than 5mm, the average zinc layer weight after galvanizing shall not be less than 610g/㎡; when the thickness of the load-bearing flat steel is less than 5mm, the average zinc layer weight after galvanizing shall not be less than 460g/㎡ .