Single-track railway tunnel full-section initial support rapid ring forming construction method

The invention discloses a single-track railway tunnel full-section primary support rapid ring forming construction method which comprises the following steps: firstly, drilling a shot hole in a tunnel section according to a measurement result, then putting a water bag and an explosive bag into a mounting cylinder in turn, then putting the mounting cylinder into the drilled shot hole, and then taking out the mounting cylinder from the shot hole; and the blasting charge explodes to detonate the water bag, so that the effect of reducing smoke dust is achieved. After blasting is completed, smoke discharging and slag removing are conducted in time, then the advanced guide pipe is driven into a soil layer around the tunnel section, and cement mortar is poured into the advanced guide pipe; then, the inverted arch is excavated, and slag is removed in time after excavation is completed; then, an arch wall steel frame, a reinforcing mesh and steel frame longitudinal connecting steel bars are installed in the tunnel, an