Tunnel arc-shaped piece erector fine adjustment platform and arc-shaped piece

The utility model discloses a fine adjustment platform of a tunnel arc-shaped piece erector, which is of a rectangular frame supporting structure, vertical jacking type adjustable supporting legs are arranged at four top corners of the fine adjustment platform, and the fine adjustment platform can ascend or descend in the vertical direction. The longitudinal moving rack is erected on the basic rack and can slide back and forth in a reciprocating mode in the longitudinal direction of the basic rack; the transverse moving platform can slide back and forth in the left-right direction of the longitudinal moving rack; the rotating bearing is arranged on the upper portion of the transverse moving platform. The rotary platform is located on the rotary bearing, and the geometric center of the rotary platform is vertically collinear with the geometric center of the rotary bearing; the jacking fine adjustment oil cylinders are vertically arranged on the upper portions of the four corners of the rotary platform respecti