分压式孔底局部反循环钻具
differential pressure bore bottom locality reverse circulation tool
钻孔扩底灌注桩
Drilling Bottom-enlarged Grouting Pile
Bored club-footed pile
under-reamed bored pile
Bored Cast-in-place Pile with Enlarged Bottom
钻孔扩底桩
pedestal piles
amsacrine injection
under-reamed bored piles
Boring and Expanding Bottom Pile
大孔钻孔
big-diameter hole drilling
精密深孔钻孔工具
precision deep hole drilling tool