Abstract: A device for breaking up concrete piles comprising a housing bounding a passage and having two relatively parallel plates, to which are secured supports extending between them, to which supports are fastened hydraulic rams each having a piston rod, to the end of which is fastened a chisel which can be displaced through the passage with the aid of the hydraulic ram concerned, the chisels being passed through openings matching the cross-sections of the chisels and provided in screening plates bounding the passage and extending between the relatively parallel plates.