Research on construction technology of cantilever expansion of some stage hall grid structure

Based on some stage hall grid structure adopts high altitude scattered expansion construction technology, the original construction technical scheme adopts a T-shaped scaffold to construct, but this scheme will influence the underground stage hall´s construction, and its cost is larger, therefore recommend a bar supporting frame to be built as starting unit, then to form stable unit, then to dismantl scaffold for cantilever expansion construction. Using this new construction technology, we need to study the stability conditions of starting unit and stress and strain distribution of construction assembly process, to satisfy grid structure construction standard. Therefore, this article analyzes the grid construction according to construction steps in detail, altogether 45 construction steps, analyzes starting unit´s the change rule of the stresses and deformations, analyzes the stresses and deformations of the cantilever expansion part, analyzes construction arch of the grid structure. The analysis results show that the new construction technology is a feasible construction scheme.