Ventilation and dust removal system for large-section tunnel cantilever type heading machine construction method

The utility model discloses a large-section tunnel cantilever type heading machine construction method ventilation and dust removal system. Space in a tunnel is narrow, dust cannot be removed as soon as possible, and environment in the tunnel is poor. The device comprises a full-section arch-shaped portal frame which is arranged at the joint of a tunnel face excavation area and a second lining construction area; an axial flow fan is arranged at the top of the arch-shaped portal frame and is connected with a vitiated air ventilation air belt, and the other end of the vitiated air ventilation air belt is arranged outside the tunnel; the hole is provided with a jet fan, the jet fan is connected with a fresh air ventilation air belt, and the other end of the fresh air ventilation air belt is arranged in a tunnel face excavation area; a partition facility is arranged on the side, located on the tunnel face, of the arch-shaped portal frame. According to the utility model, the full-section portal frame is adopted to