space frame structure of bar section should be calculated and determined according to the strength and stability. To reduce the calculation of compressive bar length to increase its stability, and can be used to add more points and measures to support bar, etc. Made of steel plate type rack and double shell mold rack nodes, nodes are cross board, welding hollow ball and bolt ball node three forms. Cross board node apply to the space truss structure of steel bar, bar and section

space frame structure by clicking the link plate, high strength bolt connection or welding. Hollow ball nodes and bolt ball node apply to the space truss structure of steel bar. Single layer shell mold rack of nodes should be able to withstand the bending internal force, under normal circumstances, the node of steel consumption accounted for the entire quantity of steel grid structure with steel 15 ~ 20%.