Inner sleeve blocking method for leakage of small-diameter concrete drainage pipeline

The invention discloses an inner sleeve blocking method for leakage of a small-diameter concrete drainage pipeline. The method includes the following steps that first, a leakage well segment is judged out with a segmentation flow measurement method; second, a double-face conical iron bucket dredging device is sleeved with a rope to move back and forth to clean up impurities in the pipeline; third, in an upstream well segment inspection well of the pipeline to be handled, air is supplied into a pipe network continuously through an air blower, and the upstream pipeline is blocked; fourth, an inner sleeve is installed in the pipeline to be handled; fifth, the inner sleeve and the pipeline are blocked in the connection position of the inspection well, and mortar is injected between the inner sleeve and the pipeline for blocking. According to the method, the inner sleeve is additionally arranged in the leakage pipe segment, after the pipeline end is sealed, positions between the inner sleeve and the pipeline are grouted, so that a circular grouting ring is added to the inner side of the leakage pipe segment, and then the pipe leakage prevention effect is achieved. The method has the advantages of being simple in whole work procedure operation, short in construction period, low in cost and the like.