【Key words】 bored pile; large floating rock; tubular drill; down-the hole hammer drilling
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A large number of floating impurities in the emulsion, and the valve chamber in the column bottom, left more coal, rock and iron tablets.
乳化液中有大量的漂浮杂质，在立柱缸底和阀腔，留有较多的煤粉、岩粒和铁屑。
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