cracked manhole cover

Sometimesthe most inconspicuous things provoke the most questions. It may be hard to see from this picture.

1. What could have been on this manhole cover to not only crack it clean through, but also crack the sidewalk clean through and leave both with a 10 degree bend?
2. Who was the guy who put that weight there?
3. Did this guy say anything to anyone or just ignored the fact that he broke the street?

My guesses. Construction worker, crane, never said a word, never even thought twice about it.