Pneumatic jacking device for tunnel steel arch

The utility model belongs to the technical field of tunnel construction, and relates to a tunnel steel arch pneumatic jacking device which comprises an operation jig frame and an operation platform fixedly installed on the operation jig frame, a sliding rail is fixedly installed in the middle of the operation platform, a fixing device is installed on the sliding rail in a sliding mode, and an air cylinder is fixedly installed on the fixing device. A plurality of supporting inclined bars used for supporting the air cylinder are fixedly installed on the outer side of the air cylinder, the air cylinder is connected with an air source control system through an air cylinder air pipe, the air source control system is installed at the edge position of the operation platform, and the bottom of the air source control system is connected with a high-pressure air pipe. The problems that when the arch crown segment arch frame is assembled in the prior art, much manpower is used, the labor intensity is large, and some uns