Quote:
Originally Posted by BurnabyAaron
If the piece is damaged or irretrievable, which my guess it would be, I don't know how far the piece fell, but thats not something concrete is made for, there is a number to keep in mind prior to a new piece being created.
(this type of construction does use specific pieces in specific places)
28 days. That is the amount of time for the concrete to cure to 90% of its compressive strength. After that it'll taper off towards 100% which it will reach who knows when. (I believe 100% would is an asymptote)
So 28 days from the time its poured, getting the concrete isn't hard, they know whats needed in terms of the mix. They'll do all the testing as its poured, and compression testing will probably be done at 1, 7, 14 and 28 days (if I'm remembering the important times there right)
Hardest thing I can think of is getting the forms perfect, the very well might have taken their production facilities down awhile ago when they finished all the prefab pieces. Could be just a giant storage yard now.
I would guess the critical path here is the actual Crane. you have to salvage whats there, asses the damage and custom build any replaceable pieces. That's a big questions mark for a timeline.
In other words, 2 months doesn't seem to long for this at all. But that only makes sense if the approach was going to finish after the bridge span, It looked ahead of the bridge to me, so while this could delay the approach, the bridge could still finish on time.
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Good post, thanks for the information, I am surprised how my complete guess estimates are close to your numbers
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Sounds like they are lucky if you are right and the bridge is ahead of schedule. Still will cause obvious problems with the stoppage of work etc. but the biggest threat is not finishing on time and facing penalties and damage to their reputation.
Also Metro-One I would think you are right that they "maybe" can continue building the other approach after a investigation in to what went wrong and how to make sure that doesnt happen again. The problem is that the bridge cant be finished until "this section is finished" so it doesnt solve the delay problem. Also the reason I said maybe is because I am under the impression that the bridge deck needs to be balanced on both sides as it builds out from the cables towers so you have to be able to build in both directions at the same time, also even though I am obviously not a bridge engineer I am certain that the bridge during construction is very vulnerable(e.i. if a large earthquake hit today that bridge would likely fall). Because of that I wonder if there is a increased risk in building out a deck without connecting it all up and having it just hang there from the towers waiting for the other half of the bridge to catch up and connect. The increased risk imo would be that the more deck you have hanging from the tower means the more weight you have hanging from the tower and the more unstable it is going to be and prone to damage/disaster in a accident, wind storm, etc.(in other words my guess is that the most critical and dangerous point in the construction of the bridge is when the deck is fully built out from the towers and just needs to connect up, so leaving it hanging there in that state might not be a wise move).
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