Multi-section expansion anchor rod suitable for soft rock stratum of mine and using method of multi-section expansion anchor rod

The invention relates to the technical field of expansion anchor rods, in particular to a multi-section expansion anchor rod suitable for a soft rock stratum of a mine and a using method thereof.The multi-section expansion anchor rod comprises an upper rod body, a lower expansion pipe is fixedly connected to the outer portion of the upper rod body, an expansion groove is formed in the outer portion of the lower expansion pipe, and a threaded pipe is fixedly connected to the outer portion of the lower expansion pipe; the outer portion of the threaded column is in threaded connection with a threaded column, the outer portion of the threaded column is in threaded connection with an outer frame, the outer portion of the threaded column is rotationally connected with a transverse rod, the outer frame is fixedly connected with the upper rod body, the outer portion of the transverse rod is connected with a sliding sleeve, the outer portion of the sliding sleeve is rotationally connected with a fixing cone, the slidi