The heavy shelf is assembled by the column, beam, cross brace, diagonal brace and self-locking bolt, which can effec- tively prevent the instability of the shelf after the bolt is loosened.

The beam adopts special cold rolled P-type closed beam, which has the characteristics of simple and reliable, light weight, strong bearing capacity and low cost. When  the column card is connected with the column, it is equipped with a special design safety pin, which can ensure that the beam will not fall off under the impact of external force; The laminate is made of international strip laminate, which has the characteristics of strong bearing capacity, wear resistance, simple replacement and low mainte- nance cost.