To provide an earth drill and a pile driver, capable of drilling precisely a hole, even when hole-drilling a soil buried with a gravel in a hole drilling portion or nonuniform in a strength, for example, using the pile driver with no leader.
This earth drill 10 includes a drill head 40 in a lower end of a drill shaft 20, and a hollow casing 30 fixed rotatably onto the drill shaft 20 by an adjustable fixing tool 34, in an upper side of the drill head 40, a shaft side stirring blade 21 directed toward a diameter outside, in an outer circumferential face opposed to the casing 30 in the drill shaft 20, a casing side stirring blade 33 directed toward a diameter inside, in an inner circumferential face of the casing 30, and a locking rib 32 for deterring the casing 30 from being rotated together with the drill shaft 20.
Motoaki Nagata
Hironori Nishihara
Eiji Ota