1) hollow "primary-secondary" driller
空心"子母"钻
1.
Applying the hollow "primary-secondary" driller to expand the holes for reducing the peripheral frictional resistance of the internal drive pipe can make the internal drive pipe submerge to the position of the broken pile.
应用空心“子母”钻对桩基进行扩孔,通过减小内护筒周边的摩擦阻力,可使内护筒顺利下沉到断桩位置。
2) Hollow drill
空心钻
3) hollow boring bit
空心钻头
4) hollow rod
空心钻杆
5) core drill
岩芯钻机;空心钻
6) hollow-rod drilling
空心钻杆钻进
补充资料：冻土钻(见取土钻)
冻土钻(见取土钻)
dongtuzuan冻土钻见取土钻
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条