Construction method for layered lifting of large-span open-web corridor steel platform

The invention relates to a construction method for layered lifting of a large-span open-web corridor steel platform, and belongs to the technical field of building steel structure installation and construction. The problems that when a multi-layer large-span corridor between high-rise buildings is constructed, the corridor steel platform needs to be hoisted layer by layer, hoisting is conducted from bottom to top through a traditional method, the requirement for a construction site is large, and the requirement for the station position of hoisting device is met are solved. The problem that the safety is poor due to the fact that an upper-layer steel platform is assembled on the basis of a lower-layer steel platform and then hoisting operation is conducted, but the construction face is insufficient is solved. According to the steel platform lifting construction method, main beam brackets are installed on the buildings on the two sides to serve as pre-installation pieces, and the lengths of the main beam bracke