High-precision grouting hole opening sealing device convenient to construct and using method thereof

The high-precision grouting hole opening sealing device convenient to construct comprises an inner core steel pipe and a steel floral pipe which are inserted into a drill hole, the steel floral pipe is located on the lower side of the inner core steel pipe, the outer side of the inner core steel pipe is detachably sleeved with a rubber bag, and the rubber bag is used for filling a gap between the inner core steel pipe and the drill hole; an upper fixing ring is arranged on the upper side of the inner core steel pipe, a perforated hole is formed in the lower side of the steel perforated pipe, and the grouting pipe penetrates through the inner core steel pipe and the steel perforated pipe and completes grouting of a drilled hole through the perforated hole. The device is ingenious in design, can cope with the change of a drill hole, guarantees the accuracy of self installation, stable fixation and convenient operation, and provides guarantee for the quality and efficiency of grouting. 本发明提供一种便于施工的高精度注浆孔孔口封闭装置及其