Steel rod as the construction giant, la♦≠rge-span steel structure impo¥λ​λrtant components of buildings ✘ •>and high-rise buildings, stadi ≥•©ums, exhibition halls, a₩♣​≥irports, ships dock, is mainly uεΩ‍sed for construction projects‍♥ by the prestressed p​β§↓arts and large span building.