PROBLEM TO BE SOLVED: To provide a drilling auger head capable of carefully performing agitation of improved soil without increasing the number of reciprocation of the drilling auger head.;SOLUTION: A drilling auger head 1 includes: a drilling shaft 2 which is rotatingly driven; drilling blades 3, 4 fixed to a lower end of the drilling shaft 2 and each having a plurality of drilling bits 9; a plate-like corotation prevention blade 6 attached to the drilling shaft 2 above the drilling blades 3, 4 in a rotatable manner and extending outward in the radial direction of the drilling shaft 2; a belt-like first agitating blade 7 fixed to the drilling shaft 2 above the corotation prevention blade 6 and formed so that it draws a spiral around and along the drilling shaft 2 in a position separated outside of the drilling shaft 2 in the radial direction; and a plate-like second agitating blade 8 fixed to the drilling shaft 2 above the first agitation blade 7 and extending outward in the radial direction of the drilling shaft 2.;COPYRIGHT: (C)2014,JPO&INPIT
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