1·The present applied calculation method is very complicated and low calculating accuracy, and this method can not determine the drilling hole position.
目前实际中采用的计算方法很繁杂，计算精度低，而且不能给出最优的钻孔位置。
2·It can improve gas suction effect, reduce drilling hole amount and save construction investment.
采用优化后的方法可以提高瓦斯抽放效果，减少钻孔数量从而节省施工投入。
3·In this paper, analytic geometry is drawn into drilling hole position calculation and have the aid of computer, the calculation is accurate.
本文引入解析几何，借助计算机对钻孔位置进行较精确计算。
4·The paper introduces a new technology of CFG pile-pressure grouting of long helical drilling hole, and analyses design, service scope and development trend of CFG pile.
介绍了CFG桩的一种新的成桩工艺——长螺旋钻孔压力灌浆法，对CFG桩的设计、使用范围和发展趋势作了分析。
5·Through analyzing the characteristics of the part, according to drilling hole on the conical surface, designed the special clamping tool.
通过对零件的工艺性分析，针对零件要在锥面上钻孔的特点所设计的专用夹具。