The Albany County Rail Trail was the Delaware & Hudson Railroad.
I've seen a lot more pedestrian bridges than road bridges that have collapsed during construction. For example, the FIU Bridge.
Ed Bonapartian posted two photos with the comment: "We had a bridge beam failure in Slingerlands, NY, earlier this week when the concrete decking was being poured. This is a pedestrian walkway bridge replacement over a local road."
Miller Miller: Awful big iron for a pedestrian bridge.
Bob Featherstone: Miller Miller Yes. I think it was supposed to look like a railway bridge, not be a railway bridge. What drove on it?
James Torgeson: Bob Featherstone A cement mixer, apparently.
[Some comments indicate that the ready-mix truck was on the main span to the right of the yellow screed machine. As one comment said, this is what concrete pumps are for. The bridge was probably designed to carry an ambulance. But was it designed for trucks?]
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Note that the design they are trying to memic had support columns between the approach and main spans. The clearance of the old bridge was just 11' 2".
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| Street View, Jul 2018 |
As some comments in the above post indicated, the web needed some more stiffeners in the aread of the transition if it was supposed to support a ready-mix truck.
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| 16th of 21 photos in TimesUnion, Daniel Roberts/Times Union The $3.28m project started in March, and it was supposed to be finished by July 31. |
There was no concrete truck on the bridge, that is the truss screed. Don’t post misinformation
ReplyDeleteAs I mentioned, what we see is the screed machine. Supposedly there was a concrete truck out-of-frame to the right of the screed machine. For example, one of the comments about the truck:
DeleteRick Rowlands
Group expert
The clues are right there in front of you. It is a pedestrian bridge that they had a fully loaded concrete truck on to pour the deck. Wasn't bad welds or bad engineering, it wasn't designed for the weight of a concrete truck.
You can’t drive a concrete truck on the rebar. The truck would fall right through the deck. Also look at the abutments there is a gap that is no vehicle can cross at the ends. The only time a deck is poured the way you are saying is if this was a deck rehab where they milled the top surface only. Which is not the case here.
ReplyDeleteI was willing to believe that a bridge design could not hold an unexpected extreme live load. But I was not willing to believe that it could not hold less than its designed dead load. But I have to agree that in today's world they probably used a concrete pump truck from the road under the bridge. So I guess the bridge design was so bad that it could not hold itself up.
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