screw-pile

screw pile

noun
a pile that is used for the foundations of bridges, lighthouses, etc., and has a screwlike lower end for drilling through and taking firm hold in compacted material.

Origin:
1830–40

screw piling, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
screw pile
 
n
a pile with a threaded tip that is screwed into the ground by a winch or capstan

Collins English Dictionary - Complete & Unabridged 10th Edition
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