Assembling structure, connecting device and connecting method for duct pieces with different radiuses

The invention relates to metro section engineering, and discloses an assembling structure, a connecting device and a connecting method of pipe pieces with different radiuses. The assembling structure of the pipe pieces with the different radiuses comprises a first pipe piece, a second pipe piece and a connecting device, the first pipe piece and the second pipe piece are connected through the connecting device, the connecting device comprises a first annular plate, a second annular plate and a third annular plate, the first annular plate is matched with the first pipe piece, the third annular plate is matched with the second pipe piece, and the first pipe piece and the second pipe piece are connected through the connecting device. The first annular plate, the second annular plate and the third annular plate are sequentially arranged and connected through the first connecting pieces, the first pipe piece is connected with the first annular plate and the second annular plate through the second connecting pieces,