Stacked tunnel common plate building structure

The utility model provides a common-plate building structure for overlapped tunnels. The common-plate building structure comprises an upper-layer tunnel and a lower-layer tunnel, the upper-layer tunnel and the lower-layer tunnel are both square double-hole tunnels; the vertically overlapped part of the upper-layer tunnel and the lower-layer tunnel is a tunnel combined construction section, the tunnel combined construction section is divided into an upper combined construction part and a lower combined construction part, and the upper combined construction part and the lower combined construction part are connected into a whole through a middle plate in a common plate mode; nine reinforcing columns which are reinforced according to columns are arranged at nine crossed positions of the three side walls of the lower composite part and the three side walls of the upper composite part, and the nine reinforcing columns vertically penetrate through the upper composite part and the lower composite part; and except fo