This project is an overpass fabrication and installation project. The overpass is 30.5m long, installed between buildings A and B, and the installation elevation is+86.00m. The project is divided into prefabrication and installation: prefabrication includes BH steel fabrication, galvanizing and other work; The installation shall be carried out on site, including BH steel butt joint, K-frame assembly, installation, fixation, zinc supplement, painting, etc. Difficulty in fabrication and hoisting