VERTICAL HOLE EXCAVATOR

PROBLEM TO BE SOLVED: To increase the efficiency of excavating work and soil dislodging work. SOLUTION: This excavator is provided with a support stand 14 supported and secured to the interior wall face of a vertical hole 11; an upper cylinder 15 provided in such a way as to pass through the center part of the support stand 14 and to be capable of moving back and forth in the vertical direction; and a lower cylinder 18 which is joined to the lower end of the upper cylinder 15 in such a way as to be rotatable relative to the upper cylinder 14 and which has a cutting bit 16 at its lower end and a soil opening 17 on its side. Further, the excavator is provided with a helical drum excavating unit 19, in which a conveying passage for soil excavated by a helical vane is mounted in such a way as to communicate to the soil opening 17, and with a suction pipeline 20 inserted into the lower cylinder 18 through the upper cylinder 15.