High pressure ring-shaped DTH drills are key equipment for underground high level large diameter long hole mining.
高气压环形潜孔钻机是地下矿山高阶段大直径深孔采矿的关键设备。
This paper describes the effects of bottom water cushion on long hole blasting.
本文论述了水垫层在深孔爆破中的作用。
In view of long hole section, milt-point, disconnected channels of Xing 1~3 block in Daqing oilfield, proposed countermeasure for detect and treatment channels outside tube.
针对大庆油田杏1~3区乙块三次加密试验区大段、多点、不连续窜槽井问题，提出了相应的管外窜槽检测及治理对策。
The principle of increasing gas emission rate by long hole blasting in the crossing hole is discussed. The radius cracked zone in coal seam caused by long hole blasting is calculated.
简要论述了深孔爆破提高瓦斯抽放的机理，以煤体中柱状装药爆炸后的裂隙圈半径进行了计算。
The sleeve is a hollow cylindrical sleeve; reinforced hoops are respectively arranged on the upper end and lower end of the sleeve; a vertical waist-shaped long hole is arranged on the sleeve.
所述的套筒为一空心圆柱形筒，套筒的上、下两端分别设有加强箍，套筒上设置有纵向的腰形长孔。
A new technique of the long-hole blasting has been used in raising and prospecting of the rooms and the pillars.
一次钻孔分段爆破的新工艺已成功地应用到天井掘进和矿房、矿柱的回采方面。
On these grounds, it is confirmed that the general blasting scheme of combining the long-hole and short-hole blasting with water-pressure blasting should be adopted so as to realize the design idea.
据此提出完成这一设计思想应采取深孔爆破、水压爆破及浅眼爆破相结合的最佳方案。
The blasting boulder yield is an important quality indicators in the step long-hole blasting of surface mine.
大块率是评价露天矿台阶深孔爆破质量的重要指标之一。
The technical requirements adopted for open long-hole blasting and its insurance countermeasures were put forward by summarizing the blasting operation during exploiting the Tunqiu Mine of Liugang.
通过对柳钢屯秋矿开采中的爆破工作进行总结研究，提出采用露天开采深孔爆破的技术条件与安全保障措施。
The parameters and layout of linear shaped charge, and the hole-pattern parameters, charging structure and priming method for long-hole blasting were discussed.
讨论了线形聚能装药的参数、设置方法以及深孔爆破的布孔参数、装药结构、起爆方法。
The parameters and layout of linear shaped charge, and the hole-pattern parameters, charging structure and priming method for long-hole blasting were discussed.
讨论了线形聚能装药的参数、设置方法以及深孔爆破的布孔参数、装药结构、起爆方法。
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