It's 11:45 pm does anybody know what that banging is?

Seriously. For the most of the day and all through tonight (currently 11:46pm) I've been hearing what sounds like a piledriver sending "I" beams into the area of Atlantic Av and Vanderbilt. I'm blocks away and the echos of pounding haven't let up. Now I like to party as much as the next handsome young lad, but listening to "Clyde's Car Crusher" all through the night is not going help me knock out this flu. Plus it's late for this type of work, no? Anybody have a clue?