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FORAGE FOND TROU [1 record]

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Filter results by subject field

Alphabetical list of terms

Record 1 2016-02-29

English

Subject field(s)
  • Boring and Drilling (Mines)
CONT

Down-the-hole drilling is air percussion type (for large-diameter blast holes) with the reciprocating pneumatic piston placed in the drill tools close to the bit for minimizing energy losses.

French

Domaine(s)
  • Sondage et forage miniers
CONT

Perforation fond-de-trou. Les exigences croissantes de rendement dans le forage en gradins conduisent à l'emploi de plus en plus répandu des grands diamètres de forage. La foration percutante classique est pratiquement limitée à un diamètre d'environ 4" (...) mais les marteaux fond-de-trou permettent d'obtenir des diamètres beaucoup plus grands. Un marteau fond-de-trou permet également de forer des trous plus droits qu'un marteau hors-trou, même dans des roches fissurées ou endommagées.

Spanish

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