Network frame manufacturers include Jiangsu Huahai Steel Structure Co., Ltd., Xuzhou Dinggu Steel Structure Co., Ltd., etc.
The grid can be divided into two types of nodes: welded ball grid and bolted ball grid. The plane shape of the flat grid is flexible and can be designed into various shapes. According to the different settings of the web rods, it can be divided into: cross truss system, quadrangular pyramid system, triangular pyramid system and other systems.
When the chord of the grid is perpendicular to the boundary, it is called a normal grid, and when it is oblique to the boundary, it is called an oblique grid. Countries around the world have successfully built many grid structures in large and medium-sized roofs, such as the expositions in Canada and Japan, the Congress Hall in Chicago, the United States, and the aircraft hangar in London, the United Kingdom. The plane dimensions are large and the total amount of steel used is relatively large. Economically, the former Soviet Union also used prestressing in the grid. In short, the grid structure has become one of the more commonly used new structures in the modern world.