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pneumatic pile

noun, Building Trades.
a hollow pile, used under water, in which a vacuum is induced so that air and water pressure force it into place.
Origin of pneumatic pile
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for pneumatic pile
  • Heavy driving equipment such as a drop hammer, pneumatic pile driver, or steam pile driver are also used.

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