Propagation of water wave over a periodically perforated bottom and the band structure
水波在周期性钻孔底部结构中的传播及其能带
tap(ping) drill
螺丝孔钻，螺丝底孔钻
counterbore with guide
有导柱的平底扩充孔钻
BHA directional behavior
底部钻具组合定向特性
multistabilizer BHA
多稳定器底部钻具组合
and are fitted with a cutting bit at the bottom.
它的底部装有钻头。
The first choice is to dig our heads and oil drills deeper into the ground.
第1种选择就是用石油钻孔机钻至更深的地底。
the round part of the bit by which it is held in the drill.
钻头上的控制钻孔机的圆形部分。
Drill three holes in the floor/base plate for anchoring the leg.
在地面/底板上为锚固支柱打钻三个孔。
Post pressure grouting of borehole cast-in-situ pile bottom and its quality control
钻孔灌注桩孔底后压浆施工工艺及质量控制
Analysis and treatment on pile bore checking collapse accidents of large diameter bored perfusion pile
大口径钻孔扩底灌注桩在孔形检测时的塌孔分析及处理
Acoustic Transmission and Measurement Method for Near-bit Dynamic Force Signal of Bottom Drill String
底部钻柱近钻头动态力测量及声传输方法
The Application Effect Analysis of Post grouting Under Bored Piles with Different Bearing Strata
不同持力层钻孔桩桩底后注浆应用效果分析
DEVELOPMENT AND APPLICATION OF UNDER-REAMED BORE PILE DRILLIED BY MECHNICAL ROTATING CUTTER
钻孔机械旋转刀扩底灌注桩的开发与应用
Latter Cenent-inject Technique Reseach and Application for Underlying of a Big Diameter Drill-affusing Pile in Nerilic Pool Region;
滩涂区钻孔灌注桩桩底注浆技术的研究和应用
Engineering Application in the Technology of Grouting after Pile Driving at Bottom of Pile;
钻孔灌注桩桩底后压浆技术的工程应用
Application of Under-reamed Bored Pile in a Bridge;
钻孔扩底灌注桩在桥梁基础工程中的应用
Numerical Simulation Optimization for Release Pressure Bore Hole of Roadway Floor in Three Soft Coal Seam
三软煤层巷道底板钻孔卸压的数值模拟优化