1) back reamer
回扩钻头
1.
The paper dis- cussed the main technical points of bedrock drilling,the design and selection of back reamers for different formations and drilling diameters,detailed construction technology of bedrock with typical engineering cases in China and prospected the future development.
论述了非开挖基岩钻进的技术要点及在不同地层、不同管径施工条件下对非开挖回扩钻头的设计及选用。
2.
The improved back reamer is in favor of rock cutting,taken effects on drilling guiding and stabilizing,low cutting resistance,high strength,and good wear resistance,thus have improved drilling efficiency greatly.
针对导向钻进非开挖铺设地下管线施工中回扩钻头存在的口径大、包泥堵钻、进尺缓慢、切削齿不耐磨等问题,对钻头结构进行了研究,并从导向钻头、出水口、刮刀、切削齿等四个方面对钻头进行了改进。
2) three wing back reamer
三翼回拉扩孔钻头
1.
The mechanical characteristics of the three wing back reamer used in guided boring in difficult formation is examined.
分析了导向钻进法用三翼回拉扩孔钻头在复杂地层条件下的力学性质 ,推导了计算不同岩石的最优切削角公式 ,并得出常见岩石的最优切削角值 ,进一步对回拉扩孔钻头的结构形式提出了优化 ,为导向钻进法回拉扩孔施工达到最优钻进 ,提供了必要的力学计算依
3) back reaming
回扩钻进
4) Ream bit
扩孔钻头
1.
When wind force cutting pick-up drilling is applyed in coal seam if dedusting equipment is installed in the opening of the bore,it should enlarge drilling bore with ream bit so that dedusting equipment can be installed,and then retreat drilling and replace bit of drill.
在煤层采用风力排渣打钻时,如果在钻孔孔口处安装除尘设备,在打钻前要采用扩孔钻头打一个能够安装除尘器的钻孔,然后退钻更换钻头钻进。
5) pedestal drill
扩底钻头
6) reamer bit
扩眼钻头
补充资料：三一回五一回
1.犹言三番五次。
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