Although the steel space frame structure has many rods, various shapes, and complex forces, it has strong space spanning ability, light weight, good integrity, and excellent seismic resistance. It is widely used in large-span, curved space, large overhangs, and shape In the unique complex space system, such as airport terminals, high-speed railway stations, automobile exhibition halls, Olympic sports venues, large playgrounds, film and television theaters, building canopies and even industrial plants, etc. The on-site inspection and measurement of the space frame structure is an important guarantee for the quality and safety of the large-span steel structure space frame. Inspection and identification etc. Although the space frame structure has many advantages, due to long service life, improper construction, variable loads, external influences, and unqualified steel quality, some structures will often have various apparent defects over time. For example, the rod is bent, the node is loose, falling off, the coating is peeling off, the bolt is loose, there is no sleeve, etc. However, the occurrence and development of these defects will affect the quality of the space frame structure to varying degrees, and some defects may be further upgraded to safety hazards. If measures are not taken to strengthen them, serious accidents may occur.
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