Abstract：
The No.4 business building of Beijing Greenland Center is 260m high and has truss transfer stories on 42F and 43F. The construction encountered various difficulties, such as complex node forms, high elevation of construction storey, a large number of super-heavy components and difficult welding of thick Q420 steel sheet, etc. These difficulties were successfully overcome by using various measures, e.g. disassembly of component, horizontal sliding of component, corner column, construction control of outrigger truss and ring truss, measurement control and welding process, etc. The structural quality satisfied the requirements after inspection.
