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。
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。
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。
Technology of 1000 meter directional borehole at large diameter for mine gas extraction
顶板大直径千米长钻孔抽采瓦斯技术
Pressure releasing and gas drainage with long bore hole in roof overburden of fully mechanized caving face
综放面顶板覆岩走向长钻孔卸压抽放瓦斯研究
Study on the Vertical Bearing Capacity of Large-Diameter Bored Cast-in-Situ Long Pile;
大直径深长钻孔灌注桩单桩竖向承载性能研究
Research on Axial Loading-Settlement Curve of Super-Long Bored Single Pile;
超长钻孔灌注单桩轴向荷载—沉降曲线研究
The Research on Backfilling Experiments of Long Distance Drilling
软土地区超长钻孔灌注桩后注浆试验研究
Technique for Construction of Large Diameter Over-long Drilled Piles in Complex Geology in Deep Water
深水复杂地质大直径超长钻孔桩施工技术
Boring Technique for Bored Piles of Main Bridge Pier No.7 of Dashengguan Changjiang River Brigde in Nanjing
南京大胜关长江大桥7号墩钻孔桩成孔技术
An experimental study of the auger bored cast-with-pressure concrete pile on soft ground
软土地区长螺旋钻孔压灌桩试验研究
Construction of Bored Piles in Double wall Steel Cofferdam for the Second Changjiang River Bridge in Wuhan
武汉长江二桥双壁钢围堰钻孔桩施工
Improving Growth of Street Trees by Boring the Rhizo$pheric Soil for Aeration
土壤钻孔通气法对行道树生长的改善
Study on the Reliability of the Auger Bored Cast-with-pressure Concrete Pile
长螺旋钻孔压灌混凝土桩可靠度研究
Research on the Bearing Performance of the Super-Long and Large-Diameter Bored Pile;
超长大直径钻孔灌注桩承载性能研究
tap(ping) drill
螺丝孔钻，螺丝底孔钻
The sorker was drilling.
此工人在用钻孔机钻孔。
A: The interval is too long. I'm afraid. Could you deliver the drillers sooner?
恐怕时间隔太长了。能不能快些交付钻孔机？
Construction Control in Bored Pile with Big Diameter of Anqing Yangtse River Bridge
安庆长江大桥大直径钻孔桩的施工控制
Technique to ensure construction quality of cast-in-place gun-concreting pile by auger rig
长螺旋钻孔压灌混凝土桩施工质量技术
The analysis of interval between long screw auger taking clay and static pressuring pile
长螺旋钻孔取土与静力压桩时间间隔的分析