The pier structure and the placing of steel bars were proved by use of boreholesurveying.
利用钻孔探明了桥墩的结构和配筋情况。
2
Rotary drilling is a dominant way in geotechnical engineering boreholesurveying. Based on the principle of conversation of energy, the energy for rotary drilling has been analyzed.
旋转钻进是岩上工程钻探的主要钻进方式，从能量守恒原理出发，对旋转钻进的能量进行分析。
3
The only way to drill a high verticality borehole both in home and abroad is based on effective hole straightening, enhancing inclination surveying and on time straightening.