Single-hole multi-pipe synchronous grouting self-locking sealing device and method

According to the single-hole multi-pipe synchronous grouting self-locking sealing device and method, the device comprises a hole opening sleeve, a sealing cover, grouting pipes, a connecting ring, a sealing ring, a grout stop valve connector and an annular lock catch, through holes allowing the grouting pipes to penetrate through are formed in the sealing cover, the hole opening sleeve is pre-buried in a grout stop wall, the sealing cover and the hole opening sleeve are detachably connected through the annular lock catch, and the sealing ring is connected with the grout stop valve connector through the annular lock catch. Each connecting ring is located at the corresponding through hole and detachably connected with the grout inlet end of the corresponding grouting pipe, each grouting pipe penetrates through the corresponding through hole and extends into the same grouting hole, the grout outlet ends of the grouting pipes are located at the section positions of the same grouting hole with different depths, th