Gas reverse circulation drilling technology for large-diameter DTH hammer
Large diameter DTH hammer is a drilling tool which has been proved by a lot of engineering practice and can improve the construction efficiency of large diameter drilling on mine surface. However, after drilling into the aquifer, the penetration rate of large diameter drill hammer is often slow or...
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| Format: | Artigo |
| Jezik: | Chinês |
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Editorial Office of Safety in Coal Mines
2023-06-01
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| Serija: | Meikuang Anquan |
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| Online dostop: | https://www.mkaqzz.com/cn/article/id/8449 |
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