Large-aperture single-hole non-pressure grouting method for karst water inrush

The invention provides a large-aperture single-hole non-pressure grouting method for karst water inrush. The large-aperture single-hole non-pressure grouting method comprises the following steps that1, a grouting hole and an air outlet hole are constructed; 2, a sleeve is hoisted and placed into the grouting hole, a grouting hopper is hoisted and inserted into the upper end of the sleeve, a lifting appliance of a crane is connected with a lifting lug on the sleeve, a grouting material is injected from the upper end of the grouting hopper through a grouting pipe of a grouting pump truck, and meanwhile the sleeve is hoisted to do up-down reciprocating motion; 3, when the water amount of a karst water inrush water outlet is obviously reduced to the flow, the up-down motion of the sleeve is stopped, and the grouting material continues to be poured; and 4, after the construction grouting hole is filled with the grouting material, hole sealing treatment is carried out. According to the grouting method, a large-size