Detecting and repairing method for external diseases of buried drainage pipeline

A method for detecting and repairing external defects of a buried drainage pipeline, comprising steps of:

• S1, controlling a robot to enter the pipeline to perform comprehensive detection of pipeline defects;
• S2, analyzing detected pipeline defects with a computer terminal based on detection results of the robot, and determining locations of external defects of the pipeline according to internal defects of the pipeline located inside an external wall of the pipeline and the external defects of the pipeline located outside the external wall of the pipeline;
• S3, controlling the robot to detect a depth of the external defects of the pipeline relative to a ground surface;
• S4, determining a projection position of the external defects of the pipeline on the ground surface according to detection results of the step S2, and drilling a hole from the ground surface;
• determining a drilling depth according to detection results of the step S3, and inserting a grouting pipe;
• and
• S5, grouting and repairing the external defects of the pipeline through the grouting pipe.