Street tenderizer

The street where I live is being rebuilt. An odd piece of construction equipment is creeping past, dropping a large, blunt chisel-like object onto the pavement every foot or so. A piledriver, perhaps? It looks like it's tenderizing the surface.

The building shakes with each blow. If I didn't see the thing, I'd think a tyrannosaur with a walker was out for a stroll. About two weeks ago it spent a day inching up and down the street in this same manner, so I suppose I have hours of jarring entertainment ahead.

Good thing I'm already awake, more or less.