DRILLING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a drilling device capable of drilling at such a deep place as a bottom part of a vertical shaft. SOLUTION: This drilling device is composed of an upper main body 11 suspended to be elevatable, a lower main body 12 supported at a lower part of the upper main body 11 to be rotatable around a vertical axis, and plural breakers 13 supported at a lower part of the lower main body 12 to be laterally movable.