Safety cage for expanding excavation of diversion surge shaft

The safety cage comprises an upper disc and a lower disc, side stand columns are fixedly arranged at the four end corners of the lower end of the upper disc, the lower ends of the four side stand columns and the four end corners of the upper end face of the lower disc are fixedly arranged, and a middle stand column and side plates are arranged between the upper disc and the lower disc. A lifting device is arranged at the top end of the upper disc, symmetrical movable doors are arranged on the two sides of the lifting device and on the end face of the upper disc, a capturing device is arranged in the center of the lower end of the upper disc, supporting assemblies are arranged on the inner walls of the two opposite side plates, and an alarm assembly is arranged on the inner wall of the side plate on one side. According to the cage, workers can sit down conveniently through the supporting assembly, physical exhaustion of the workers is reduced, timely alarming and contact with external connection are facilitate