Downwater and downgas control method of vibro-replacement stone column machine

The invention discloses a water and gas discharging control method of a vibro-replacement stone column machine, the vibro-replacement stone column machine comprises a telescopic guide rod and a vibro-replacement device, and the method comprises the following steps: obtaining the current stratum compactness in the vibro-replacement construction process; the lower gas pressure of supplied lower gas is obtained; according to the corresponding relation between the preset downward air pressure and the stratum compactness, the target downward air pressure corresponding to the current stratum compactness is searched for; according to the obtained current stratum compactness, the lower gas pressure for supplying lower gas is controlled, so that the lower gas pressure for supplying lower gas reaches the target lower gas pressure; and according to the current stratum compactness obtained in the vibroflotation construction process, the lower water flow of supplied lower water is controlled so that the vibroflotation dev