| 摘要 |
PROBLEM TO BE SOLVED: To provide an excavation working machine capable of successively discharging earth and sand excavated by a rotational excavation member onto the ground, and surely and sufficiently carrying out earth removal work. SOLUTION: This excavation working machine is so constituted that a rotational excavation member driving device 3 and a casing driving device 5 located downward of the driving device 3, vertically connecting a casing 4 in a rotationally driveable manner and having such a hollow structure as a rotational excavation member 2 can pass through it are provided at a leader 1 in a liftable manner, an opening section 13 led to the outside is provided at the necessary section in a continuous passage 12 making the rotational excavation member 2 pass through it in the casing driving device 5, the opening section 13 is always closed and, at the same time, when the excavated earth and sand is held by the rotational excavation member 2 and is lifted upward from the opening section 13, the continuous passage 12 is closed and that a continuous passage closing plate 14 for leading the earth and sand moved from the rotational excavation member 2 to the outside from the opening section 13 is provided at the opening section 13.
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