| 释义 | pile extractorpile extractor[′pīl ik‚strak·tər]  (mechanical engineering) A pile hammer which strikes the pile upward so as to loosen its grip and remove it from the ground. A vibratory hammer which loosens the pile by high-frequency jarring.pile extractorA machine for pulling piles from the ground, e.g., by means of a double-acting pile hammer attached to a pile, each blow of which produces an upward force on the pile. |