Drilling auxiliary device for hole wall reinforcement and hole body straightening

The invention belongs to the technical field of cast-in-situ bored pile construction equipment, and particularly relates to a drilling auxiliary device for hole wall reinforcement and hole body straightening. The drilling auxiliary device comprises a central shaft, several reinforcing rings and a plurality of metal pipes, wherein the two ends of the central shaft are used for being butted with a drill bit and a drill rod corresponding to a cast-in-situ bored pile correspondingly, the several reinforcing rings are distributed along the axial direction of the central shaft, the reinforcing ringsand the central shaft are connected and fixed through a plurality of connecting ribs, the reinforcing rings and the central shaft are coaxial, the plurality of metal pipes are uniformly mounted and fixed in the circumferential direction of the reinforcing rings, all the metal pipes are parallel to the central shaft, and twice of the farthest distance between the outer walls of the metal pipes andthe centers of the reinfo