jackhammering with a bobcat 341 excavator and a 500 lb hammer. Concrete was 4-5″ thick with wire mesh. The ground under it was very firm and held up well under the demo. Watch what happens to the entire slab @ 21 seconds into the video. You will see all the dirt vibrating from the impact of this hard hitting hammer.

341, 500, Bobcat, Excavator, hammer, lb