Steel tube structures are widely used not only in ocean engineering and bridge engineering, but also in industrial and civil buildings. Steel tube structures are more and more used in building structures in China, such as Baosteel Phase III Project, Jilin Skating Hall, Harbin Ice and Snow Exhibition Hall, Shanghai "Oriental Pearl" TV Tower and Changchun Nanling Gymnasium. In the field of public buildings, unique structural forms of steel pipe structures emerge one after another, such as Sydney Water Sports Center and Garden Grove Crystal Church in the United States. In the field of single-story large-space buildings, (also used for power line towers, satellite launch pads, hydraulic gates, several of them, etc. )

Based on the application differences between the two, I simply cite one of the two products for reference only.

Square tube fixed truss is one of the most common trusses in the market. It not only built a span, but also suffered great strength. After transportation, storage, installation and fixation, it can be used indoors and outdoors. Truss does not need square head connection, which saves cost.

Tubular fixed truss is also a widely used truss, which can be used to build exhibition halls or background walls indoors and outdoors. This truss can replace the traditional aluminum alloy light frame (commonly known as truss). This truss can't be folded, so the bearing capacity is quite large, and the unsupported maximum span can reach 13 meters. The circular tube fixed truss also needs to be used in conjunction with the square head. Truss includes