潜孔锤泡沫钻进技术彻底攻克了潜孔锤在潮湿地层钻进的难关，加深了潜孔锤水下钻进的深度，找到了一条在涌水破碎地层进行潜孔锤钻进的有效途径。
Underhole drilling technology solved the difficulties of drilling in wet layers, deepened the drilling under water, and found an effective method of drilling hi pouring crushing layer.
实验以WC- 70潜孔锤为对象，研究泡沫对风动潜孔锤的影响。
This experiment based on WC-70 DTH hammer, study the influence of foam on the DTH hammer.
实验以WC- 70潜孔锤为对象，研究泡沫对风动潜孔锤的影响。
This experiment based on WC-70 DTH hammer, study the influence of foam on the DTH hammer.
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