Simply put, it is to use steel (mostly steel pipes) to form two flat grids, such as a flat grid composed of many small squares. Then the two plane nets are made into a three-dimensional structure net with vertical steel pipes. If the two small square grids are aligned up and down, they can form a cube, but the force is not good. Usually the two grids are stacked up and down, and the nodes of one small grid are centered in the middle of the other small grid to form a four-sided pyramid structure. Without pictures, it is difficult to explain. The grid is used in large-span spaces. Many gas station sheds are grid-structured, as are some high-speed toll stations.

Steel structure grid: a spatial structure formed by connecting multiple rods through nodes in a certain grid form.

It has the advantages of space stress, light weight, high rigidity, and good seismic performance;

The steel structure grid is widely used as the roof structure of stadiums, exhibition halls, clubs, theaters, canteens, conference rooms, waiting halls, hangars, workshops, etc. It has the characteristics of high degree of industrialization, light weight, good stability and beautiful appearance.

Grid: a spatial structure system composed of rods, nodes and supports. It belongs to a special case of trusses in steel structures. There are generally square pyramids, triangular pyramids and other structural forms.