Pile foundation hole and special long spiral hole drilling machine

The invention belongs to the technical field of building foundations and foundation construction equipment and specifically discloses a pile foundation hole and a special long spiral hole drilling machine. According to the main technical scheme, the long spiral hole drilling machine structurally comprises a drill bit, a drill pipe and a pile frame thereof, the bottom of the drill bit is provided with a shaft-fixed valve mechanism; a spiral blade constituting the drill bit is provided with a toothed piece mechanism; the toothed piece mechanism is retracted to the inner lower side of the spiralblade during drilling of the drill bit and pulled out to form a tooth protruding out of the spiral blade when the drill bit is lifted upward and rotated. The long spiral hole drilling machine can forma spiral groove in the side wall of a pile hole, the side friction resistance of a pile foundation is increased, and the bearing capacity of a pile is improved. At the same time, the strength of thepile foundation is utilized