1) extension drill
接长钻
2) lengthening rod jig
接长杆钻胎
1.
Genralizition and standardization of lengthening rod jig;
接长杆钻胎的通用化、标准化
3) extension arbor for drill holder
钻夹头接长杆
5) jumper
[英]['dʒʌmpə(r)] [美]['dʒʌmpɚ]
跳线，跨接线，桥形接线;跨接管，跨接片;长钻
6) long borehole
长钻孔
1.
The paper introduced the technical method and benefits of the gas drainage with large diameter horizontal long boreholes applied to No.
介绍了千秋煤矿21121综放工作面利用大直径水平长钻孔抽放瓦斯的技术方法和效果。
2.
After the test, a long borehole in side wall of the gateway and the long borehole blasting in coal mining face could increase the air permeability of the seam.
介绍了突出煤层掘进工作面瓦斯抽放方法试验,考察得出了巷帮长钻孔,并利用工作面深孔爆破技术来增大煤层透气性,抽放卸压瓦斯效果较为理想,大大减少了突出危险性,安全提高了煤巷单进。
3.
The long borehole in side wall of the gateway and the long borehole blasting in coal mining face could increase the air permeability of the seam.
介绍了突出煤层掘进工作面瓦斯抽放方法试验,考察得出了巷帮长钻孔利用工作面深孔爆破技术来增大煤层透气性,抽放卸压瓦斯效果较为理想,大大减少了突出危险性,安全提高了煤巷单进。
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