Method for improving ventilation of extra-long tunnel

The invention discloses a method for improving ventilation of an extra-long tunnel, and relates to the technical field of tunnel construction.The method comprises the steps that S1, a reserved hole is formed, S2, parts are fixedly assembled, S3, intermittent ventilation is conducted, S4, high-power ventilation is conducted, and S5, waste gas is exhausted. In addition, the partition plate divides the inlet pipe into a left independent space and a right independent space, the left end of the inlet pipe is ventilated, the right end of the inlet pipe is exhausted, and therefore the inlet pipe can be conveniently and quickly embedded in the vertical shaft. The exhaust device can use a single inlet pipe in the harmful exhaust emission process, the air exhaust box works, air in the inlet pipe can be fed into the air collection box through the butt joint pipe, then the ventilation pipe feeds fresh air into the tunnel through the air outlet, the air exhaust box is adopted for high-power air exhaust, and the air exhaus