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1)  core-barrel bit
硬砂岩钻头
2)  hillside sand
仅磨钻头一侧的砂岩
3)  Hd.sd.
硬砂岩
4)  hard drilling
硬岩钻凿
1.
The large hole hard drilling is a technical difficult problem,though there are many researching thinking and methods from scientists and engineering technical personnel at home and abroad and achieved certain results.
大口径硬岩钻凿是一个技术难题,尽管国内外科学家和工程技术人员研究思路及方法较多,并取得了一定效果,但是,仍然存在着各种问题和不足。
5)  hard rock drilling
硬岩钻进
1.
With introduction of the main construction method,drilling equipment and technique used inlarge diameter hard rock drilling at home and abroad in the recent years,and comparison of the economical bene-fit,it is proposed that different drilling methods and the multi-process construction should be used to cope withdifferent conditions in large diameter hard rock drilling.
通过对国内外近年来在大直径孔硬岩钻进中主要采用的施工法、钻进设备和工艺的介绍及经济效益的分析对比,提出了在大直径硬岩钻进中应根据不同情况采用不同的钻进方法及多工艺施工。
6)  cut rock
钻硬岩层
补充资料:钻凿
1.犹言钻谋。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
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