Grouting hole device based on high-pressure deep hole grouting and construction method thereof

The invention provides a grouting hole device based on high-pressure deep hole grouting and a construction method thereof. The grouting hole device comprises first casing pipes, a second casing pipe,a short pipe and an end cap, wherein the first casing pipes are arranged in a rock stratum around a roadway and used for providing positioning and supporting; the outer diameter of the second casing pipe is smaller than the inner diameter of the first casing pipes, the second casing pipe is concentrically arranged in the first casing pipes, and the second casing pipe is internally provided with agrouting hole; the short pipe is connected to the left side of the second casing pipe, and the short pipe is provided with a pressure gauge; and the end cap is connected to the left side of the shortpipe, a spherical cavity is formed in the end cap, and a second sluice valve is arranged inside the spherical cavity. According to the grouting hole device based on high-pressure deep hole grouting and the construction method t