针对500 kV同塔三回路铁塔结构和组立施工特点，研制了可旋转座地双摇臂与外拉线悬浮混合抱杆。三回路铁塔下部吊装时，具有根开大、质量大、吊装作业幅度要求大的特点，抱杆可选用座地双摇臂工况；三回路铁塔上部吊装时，具有根开小、质量相对小、吊装作业幅度要求小的特点，抱杆可灵活转换为悬浮工况。

According to the structure and erection method features of 500 kV triple circuit tower, a mixed suspension gin pole with rotatable-seating double-rocker and outside guy wire has been developed. If the hoisting of the lower part of triple circuit tower has the feature of big root distance, heavy weight and high requirement of hoisting operation, the gin pole can choose seating-type and double rockers; if the hoisting of the upper part of triple circuit tower has the feature of small root distance, relatively light weight and low requirement of hoisting operation, the gin pole can be changed to suspension type.