Regarding to the wire line geological survey boring device which does core

摘要

PROBLEM TO BE SOLVED: To provide wire-line geological-survey boring equipment for performing coring by underground drilling, which can smoothly perform excavation when running into a crushed layer such as a fault, or the like and a soft collapsed layer.;SOLUTION: A boring device part 1 of the wire-line geological-survey boring equipment includes a wire line rod 2, a locking coupling 3, a first reaming opener 4, an adapter coupling 5, a first outer tube 6, a second reaming opener 7, a second outer tube 8, a third reaming opener 9 and a core bit 10, which are sequentially coupled together. The first, second and third reaming openers 4, 7 and 9 are formed into approximately the same outside-diameter dimension D2 equivalent to 106-125% of a bit diameter D1 of the core bit 10.;COPYRIGHT: (C)2012,JPO&INPIT