To provide a dynamic consolidation method which is effective to improve low compression efficiency in a conventional iron-dropping method.

In the dynamic consolidation method, a compression rod 1 is releasably connected to the forward end of a hydraulic hammer, diesel hammer, or vibrohammer which can give continuous percussion or vertical vibration. In this case, cutting blades 4, 5 are provided at the forward end of the rod 1 in such a manner that the blades intersect crosswise each other and the central portion of the blades in the form of a cross protrudes most and the blades are retracted farther they are from the central portion of the blades.