Construction Technology of Punched and Drilled Grouting Pile in Karst Stratum

Combining practical projects,authors introduce the construction technology of punched and drilled grouting piles,which combines several construction method such as impulse reverse circulation drilling,steel cylinder protection and pressed grouting,and which can be used in karst areas having many rock cracks and cavities.This technology is a feasible and effective method for foundation construction of piles embedded on rock under similar geologic conditions.