In the 1980s, many countries in the world began to apply steel pipe profiles to the structure of iron towers when developing UHV transmission lines. Steel pipe towers with steel pipes as the main material of the towers appeared. In Japan, almost all of the 1000kV ultra-high voltage lines and towers use steel tube towers, and their research on the design of steel rods is very thorough.
Drawing on foreign experience, domestic steel pipe profiles have also been used in the 500kV double-circuit iron tower and the same tower four-circuit tower, which shows its good performance and benefits. Due to its large section stiffness, the steel tube tower structure has good stress characteristics, simple force and beautiful appearance, and has been well developed in different voltage grade lines. Especially in large-span structures and urban power grid tower structures.