The product is produced in a standardized manner, requiring only assembly on-site. The construction is safe, hygienic, dust-free, and pollution-free. The construction is not affected by weather conditions, and does not require on-site welding, cutting, or other processes. Only three or four ordinary workers are needed to achieve professional-level quality. The high-quality steel raw materials, all steel materials, and auxiliary accessories undergo processes such as shot blasting and electrostatic spraying. The quality is guaranteed, making it less prone to rust and ensuring a long service life. The application of connectors eliminates the need for welding and cutting on-site, making installation simple and rapid, and reducing the construction period.