Lateral adjustable supporting device for installation of door frame of subway civil air defense door

The subway civil air defense door frame installation lateral adjustable supporting device comprises a base, and an elastic piece is installed on the upper end face of the base through a two-way air cylinder; the elastic piece comprises two first elastic sheets which are oppositely arranged and two second elastic sheets which are oppositely arranged; the two first elastic sheets and the two second elastic sheets are sequentially fixed end to end to form an annular structure; two piston parts of the two-way air cylinder are correspondingly fixed on the two first elastic sheets respectively; the two-way air cylinder drives the two first elastic pieces and the two second elastic pieces to act synchronously; after the two second elastic pieces abut against the civil air defense door frame, the two-way air cylinder continues to drive the first elastic pieces to act, the civil air defense door frame is gradually wrapped by the second elastic pieces, and the clamping blocks are clamped on the civil air defense door f