Tunnel plain concrete secondary lining structure provided with flue plate and construction method

The invention discloses a tunnel plain concrete secondary lining structure provided with a flue plate and a construction method, the tunnel plain concrete secondary lining structure comprises a plurality of arched steel beam frameworks, two supporting bracket steel reinforcement frameworks and a secondary lining structure, and the arched steel beam frameworks are sequentially arranged in the longitudinal direction; the two supporting bracket steel reinforcement frameworks extend in the longitudinal direction and are connected with the multiple arched steel beam frameworks, and the two supporting bracket steel reinforcement frameworks are oppositely arranged in the transverse direction at intervals; and the secondary lining structure is poured and coated outside the plurality of arched steel beam frameworks and the two support bracket steel reinforcement frameworks. The arch-shaped steel beam framework is arranged in the longitudinal direction of the tunnel to form a framework structure of the secondary lining