New Development on Application of Large Diameter DTH for Rock Emdedding pile Hole

Abstract:

This article analyses the properties and requiremrnts of large diameter rock embedding pile hole ,and believes thas the hard rock embedding pile hole is a difficult problem.Traditional hard rock drilling methods are still being used though they are far from adequate .This article details newly-developed large-diameter wet reverse circulation closed hollow DTH hammer drilling system and its core ponding equipment,tools.drilling parameters and its application results.