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grouting hole to emerge, the grouting will stop. 4. During grouting, due to improper grouting or mechanical failure, the grouting was suspended, but the corrugated pipe behind the front grouting was not cleaned in time. As a result, when grouting again, it could not proceed normally due to blockage, forming an internal hole. 5. The parts that need special treatment are still pressed according to the general operation, resulting in uncompacted grouting. 6. Theition of the pulping hole is wrong, and it is not at the highest point of the corrugated tube. Therefore, when there is a slurry overflow in the pulping hole, it is mistakenly thought that the pulping body in the corrugated tube is full; In addition,