Arm guard device for one-step hole-forming steel template at easily-collapsed hole section of pebble bed of pile foundation

The invention belongs to the technical field of pile foundation arm guards, and particularly relates to a pile foundation pebble bed easy-to-collapse hole section one-time hole forming steel formwork arm guard device which comprises a pile foundation, a steel formwork arm guard device body and a steel formwork arm guard device body. The supporting assembly is connected with the pile foundation and used for supporting the side wall of the pile foundation; the supporting assembly comprises a mounting rod in sliding connection with the pile foundation. The toothed plate is fixedly connected with the mounting rod; one end of the push rod is rotationally connected with the toothed plate, and the other end of the push rod is rotationally connected with a push block; one side of the push block is slidably connected with a bottom frame, and the bottom frame is connected with a pile foundation through bolts. The end, away from the pile foundation, of the bottom frame is connected with a supporting plate through a hing