Waterproof duct piece for large shield construction

The utility model relates to the technical field of shield construction sealing, in particular to a waterproof pipe piece for large shield construction. Comprising an arc-shaped cement sheet, the cement sheets are mutually spliced in the circumferential direction and the length direction of the tunnel to form the inner wall of the circular tunnel, and a connecting assembly used for reinforcing the splicing position and a waterproof assembly used for sealing the splicing position are arranged at the splicing position of every two adjacent cement sheets; the waterproof assembly comprises a mounting groove formed in the splicing face of the cement sheet, and a rebound part and a supporting part which are made of rubber materials are arranged at the mounting groove. The elastic deformation range of the springback part is larger than that of the supporting part, and the supporting part is nested in the springback part to form a waterproof rubber pad. The waterproof duct piece is simple in overall structure and con