The H-shaped steel of the upper section column of the steel column is up to 13m long, with low center of gravity, easy to deform at the step change, and difficult to lift. The construction site is narrow, the operation line outside is long, the turning radius of vehicles is small, and there are many cross operations. There are many small pieces on the roof of the main power house, many on-site assemblies, many aerial operations, and a large amount of welding. It is difficult to organize and coordinate on-site installation. 19 pages in total, prepared in April 2008