Supporting-free cutting structure and cutting method for supporting beam in deep foundation pit

The invention relates to the field of civil engineering deep foundation pits, in particular to a supporting-free cutting structure and method for a supporting beam in a deep foundation pit, the supporting-free cutting structure comprises a base, a transfer frame and a supporting mechanism, the base is detachably connected to the side wall of the foundation pit, the end of a supporting beam body can be inserted into the base, and the transfer frame is arranged on the supporting beam body in a penetrating mode; according to the supporting-free cutting structure for the supporting beam in the deep foundation pit, under the action of the supporting-free cutting structure for the supporting beam in the deep foundation pit, in the cutting and dismantling process of the supporting beam body, the supporting beam body can be cut and dismantled, and the supporting beam body can be cut and dismantled conveniently; according to the technical scheme, no extra supporting structure needs to be used for supporting the founda