wgm: I wondered about that too. My exact thought was the guys took the nut off rather than tightened it. If you follow along close they state that they tightened the bolts more before the move to carry the load since the movers where closer to the middle than the original plan/design. So it would make sense to me they where lowering the tension back to what it should have been for the design. In the one picture you can see the thightener still attached to the rod. The rod is shot out of the concrete beam. Did the rod break or where they loosening it and the bottom nut came off????
I do not know if you caught it but they even could not use their safety harnesses correctly. The crane was setting there just so the workers on the roof could tie off to the crane. IF you watch the video real close you can see that the harness/crane failed to catch the worker. If you can not use a fall protection harness correctly should you be working on a bridge?????
So is worker/contractor error going to be the cause????
The NSB will find out what actually happened. They are very good at ferreting out the cause of this type of stuff.
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