The present invention relates to a horizontal reinforcing material that is horizontally coupled to the outer surface of an external formwork provided on the outside of the wall of a concrete structure and disposed to be spaced apart in the vertical direction of the outer formwork, and is vertically coupled to the outer surface of the horizontal reinforcing material in the longitudinal direction of the horizontal reinforcement. A connecting nut having one end inserted into the groove formed on the outer surface of the wall, passing horizontally between the vertical reinforcing materials of the gang form, which is made of vertical reinforcing materials disposed spaced apart from each other, and passing through the through hole formed in the external formwork, and the other end of the connecting nut A horizontal axis coupled to a worm wheel having teeth formed along the outer diameter, an anchor bolt spirally coupled to the inner diameter of one end of the connecting nut while embedded in the wall, is disposed on the upper side of the horizontal axis and is coupled to the vertical stiffener, in the vertical direction A clamp having a through hole formed by a clamp and a body portion penetrating the through hole vertically, a worm gear coupled to the lower end of the body portion, a thread is formed along the outer diameter and geared to the worm wheel in a state orthogonal to the horizontal axis, and is formed at the upper end of the body and rotates It relates to a gang form dismantling device for preventing fall of a worker including a vertical shaft having a head portion to which a tool is fastened. According to the present invention, the gang form can be dismantled from the wall by rotating the vertical axis by a worker safely positioned on the slab of the concrete structure, gear-engaging in a state orthogonal to the vertical axis, and rotating the horizontal axis located below the vertical axis forward and reverse. It not only provides the ease of work, but also secures the safety of the worker, thereby preventing the worker from falling when the gang form is dismantled.
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