Device for crushing slag at hole bottom of large-size pile hole after reinforcement cage is placed

The utility model discloses a device for crushing slag at the bottom of a large-size pile hole after a steel reinforcement cage is placed, which comprises the steel reinforcement cage placed in the pile hole and a grouting guide pipe inserted into a central hole of the steel reinforcement cage, and further comprises a pulling rope which descends along a pipe cavity of the grouting guide pipe, anda barrel body is hung on the pulling rope; the side wall of the cylinder body is provided with an opening mechanism used for abutting against the inner wall of the lower opening of the grouting guidepipe; a rotating body is arranged at the lower end of an output shaft of the main motor; the rotating body comprises an upper rotating disc and a lower rotating disc, at least three groups of foldingcutters are circumferentially distributed between the two rotating discs, and each group of folding cutters comprises an upper cutter bar hinged to the upper rotating disc and a lower cutter bar hinged to the lower rotating dis