I wrote about this bridge a few weeks ago. Since then, the contractor has removed the approaches, including the fill for the approach headers. This weekend, if the weather didn't shut down the contractor, the interstate will be detoured to the service roads and the spans over the highway removed. It's something I would like to watch, but I have a feeling even trying to get close will be a lesson in futility.
I have a feeling the contractor will work, regardless of the weather. Demolition of this type will not be hampered by bad soil conditions, and if the contractor planned accordingly, the remainder of the bridge has a hard surfaced place to be stored. It can all be done if it's raining, and considering the scope of the work, backing out is really not an option.
So, how would I perform this job? It's a simple task, and easily performed with the right equipment. The concrete between the girders is broken quickly with large breakers on tracked excavators that work their way back to the approaches. The reinforcement is cut as the machines break the concrete, and the rubble is loaded into dump trucks by front end loaders. After the material is hauled away, large mobile cranes can lift the girders and load them on extendable haul trailers. The girders are then delivered to another crane at the disposal area. The columns, and caps, can be broken with the same large excavators, and the rubble cleaned after they're removed.
The hardest part of the work is logistics. Traffic control devices need to be at locations long before the work begins, and staged for quick placement. There is only a window from 8:00 pm Friday to 5:00 am Monday. When the okay is given, all side streets are closed, channelizing devices remove traffic from the interstate, and the work begins. Those in traffic on the interstate will face long delays due to the detours.
The equipment has to be on hand, with spares available at a moments notice. This includes all heavy equipment, cranes, dump trucks, haul trucks, light towers, cutting torches, and electronic traffic control devices. Police presence needs to be on site, and public notices on all available media. Multiple crews will be required, since the work is around the clock until complete.
I'll post any photos I can find, when they're available. I might even go and take a gander. Time will tell, but this one is something to watch.