| 摘要 |
PROBLEM TO BE SOLVED: To use one type of an excavator driving device supporting and rotatively driving a kelly bar at a low cost in a ground excavator selectively using combinations of an excavation bucket or an excavation auger and soil kelly bars according to the soil property and stratum. SOLUTION: A driving sleeve 26 is provided in the excavator driving device 25 driving a soft soil kelly bar or a hard soil kelly bar 7B selectively used according to the soil property and stratum, and a plurality of driving plates 27 are arranged on the inner periphery. A linear side face 27a to abut on the driving rib of the soft soil kelly bar is formed on the front side face of each driving plate 27 in the driving direction, and a key type recess 27b to be coupled with the driving rib 23 of the hard soil kelly bar 7B is provided on the rear side face. The soft soil kelly bar is rotated by the linear side face 27a of the driving plate 27, or the driving plate is vertically inverted and coupled with a key type projection 23b, and the hard soil kelly bar 7B is rotated.
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