Method and device for solidifying water-filling cracking surrounding rocks of tunnel by adopting high-pressure air water-dispelling grouting

The invention particularly relates to a method and a device for solidifying water-filling cracking surrounding rocks of a tunnel by adopting high-pressure air water-dispelling grouting, solving the problems of high cost and complex process during the solidification of the water-filling cracking surrounding rocks of the tunnel in the prior art. The method adopts the following processes: a. drilling horizontal geology after ascertaining the range and the water filling condition of the water-filling cracking surrounding rocks, and then inserting a pressure-withstand pipe and sealing the periphery of the pressure-withstand pipe; b. sealing an excavation working surface to form a pump stop wall; c. guiding high-pressure air into the pressure-withstand pipe to replace and drain water filled in clearances among the cranking surrounding rocks; and d. after the pressure of the air is kept balanced, guiding cement slurry into the pressure-withstand pipe to fill the cracking surrounding rocks with the water filled in the clearance being replaced by the air. In the invention, by pressing the high-pressure air into the water-filling cracking surrounding rocks, pressing and delivering sealing material which has light weight and expanses when meeting water, quickly condensing the slurry to drain water by pressurizing, and sealing a clearance water supplement passage of the surrounding rocks,the original water-filling cracking belt grouting is changed into the water-free cracking belt grouting, thereby realizing the comprehensive effects of improving the process, simplifying the construction, improving the work efficiency and reducing the cost.