Large-section underground excavation construction primary supporting tunnel-entering reinforcing structure for subway interval stop lines

The invention discloses a large-section underground excavation construction primary supporting tunnel-entering reinforcing structure for subway interval stop lines. The large-section underground excavation construction primary supporting tunnel-entering reinforcing structure comprises a section primary support arranged in a cross passage, a crossing primary support arranged on the bottom face of acrossing, an air passage temporary inverted arch arranged in the middle of the crossing, and a frame beam arranged on the outer contour within an interval main line horsehead range, and further comprises a single-tunnel double-line large section and a single-tunnel single-line standard section which are arranged in the frame beam; and the frame beam is of an n-shaped structure, and the frame beamis connected with the side wall of the cross passage. The n-shaped frame beam is additionally arranged on the outer contour within the horsehead range, stress systems at the interval main line horsehead can be transformed smo