According to their shape, power towers can be generally divided into five types: wine cup type, cat head type, upper font type, dry font type and barrel type. According to the purpose, they are divided into: tensile tower, straight tower, corner tower, transposition tower (replacement Wire phase position tower), terminal tower and span tower. Their structural characteristics are that all tower types are space truss structures. The rods are mainly composed of single equilateral angle steel or combined angle steel. The materials generally use Q235 (A3F) and There are two types of Q345 (16Mn). The connection between the rods is made of crude bolts, and the bolts are connected by shearing force. The entire tower is composed of angle steel, connecting steel plates and bolts, and individual components such as the tower foot are welded by several steel plates to form an assembly. Therefore, it is extremely convenient for hot-dip galvanizing, transportation, and erection. For iron towers with a hoop height of less than 60m, foot nails are set on one of the main materials of the iron tower to facilitate the construction workers to climb the tower.