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3
Posted on 10/15/19 at 10:06 pm to AndyCBR
quote:watch out Baw has been doing this his whole life and never seen it.
When they are this tall the assist crane leaves once the slewing unit, boom, and counterweights are placed on top of the lower mast at a lower height.
From there, the climbing section raises the crane with hydraulics 20 feet (typically) at a time and new sections of the tower are inserted.
This how they make lifts where heights are impossible to lift form the ground or not feasible due to limitations on the ground (room).
This post was edited on 10/15/19 at 10:07 pm
Posted on 10/15/19 at 10:07 pm to thermal9221
quote:what do you see in that photo that strikes you as odd?
The more photos I see the more I believe that there was a major faulty design or craftsmanship
Posted on 10/15/19 at 10:09 pm to MrLSU
All those skinny posts in MrLSU's picture, are they basically jackscrews that are put into place, then screwed to extend them so they are jammed between the floors to support the load of the concrete floors until they cure enough to be self-supporting? Then, once the slab is strong enough, they're removed?
I failed Civil/Structural 101.
I failed Civil/Structural 101.
This post was edited on 10/15/19 at 10:11 pm
Posted on 10/15/19 at 10:11 pm to CarRamrod
I think one of Turners Demag’s can reach that and I don’t think getting it in would be a problem. Weight wise on the street may be an issue but fixing a street is cheaper than rebuilding the Saenger.
The above linked video is similar. But I’m not a crane guy so that’s just a thought. I do know Turner hasn’t been contacted.
The above linked video is similar. But I’m not a crane guy so that’s just a thought. I do know Turner hasn’t been contacted.
Posted on 10/15/19 at 10:11 pm to TigerstuckinMS
Correct, they are slab support while the concrete cures. You can also see the post tensioned cables in the photo above.
Posted on 10/15/19 at 10:13 pm to CarRamrod
quote:
watch out Baw has been doing this his whole life and never seen it.
You're the expert here. Tell us how it works?
Man you should be there with Latoya with the solution of how to take the cranes down.
Educate us!
Posted on 10/15/19 at 10:13 pm to MrLSU
That’s not from the Saturday before the collapse. That may be from last October. I know for certain.
Posted on 10/15/19 at 10:14 pm to BigPerm30
It's Google Street View from January 2019
Google Street View
ETA: I'm going to assume that's the parking structure.
Google Street View
ETA: I'm going to assume that's the parking structure.
This post was edited on 10/15/19 at 10:15 pm
Posted on 10/15/19 at 10:14 pm to MrLSU
quote:
Photo from Saturday the day before the collapse.
I may be wrong, but that appears to be well before Saturday. The bottom floors were a lot more enclosed.
Posted on 10/15/19 at 10:15 pm to AndyCBR
Hey I was agreeing with you.
Posted on 10/15/19 at 10:15 pm to eng08
quote:
You can also see the post tensioned cables in the photo above.
Basically, they stretch the cables and anchor them to squeeze the concrete to basically keep it in compression at all times so it is less likely to fail, right?
I do seem to remember that concrete isn't really isotropic and it has much higher compressive strength and almost no tensile and that was the reason for the tensioning.
I might not have learned that much about Civil/Structural, but I think some things stuck.
This post was edited on 10/15/19 at 10:21 pm
Posted on 10/15/19 at 10:15 pm to BigPerm30
quote:
That’s not from the Saturday before the collapse. That may be from last October. I know for certain.
Correct that pic doesn't even have the structure built far above the parking garage section.
Posted on 10/15/19 at 10:15 pm to AndyCBR
quote:
You're the expert here. Tell us how it works?
I’m glad I got in this thread. It just gets better.
Posted on 10/15/19 at 10:16 pm to CarRamrod
Nothing out of the ordinary.
That’s what makes me think it was an underlying issue that was possibly sparked by a small something.
That’s what makes me think it was an underlying issue that was possibly sparked by a small something.
Posted on 10/15/19 at 10:17 pm to AndyCBR
quote:
When they are this tall the assist crane leaves once the slewing unit, boom, and counterweights are placed on top of the lower mast at a lower height.
From there, the climbing section raises the crane with hydraulics 20 feet (typically) at a time and new sections of the tower are inserted.
This how they make lifts where heights are impossible to lift form the ground or not feasible due to limitations on the ground (room).
I think you are talking about jumping the crane which is different from assembling and disassembling unless I’m misunderstanding what you are writing.
Posted on 10/15/19 at 10:17 pm to CarRamrod
quote:
Hey I was agreeing with you.
My bad, didn't read that way.
I don't have all the answers but a lot of posters here don't realize what a shite sandwich this is.
It's not as complicated as going to the moon but then again lawyers weren't involved in getting us to the moon...
Posted on 10/15/19 at 10:18 pm to TigerstuckinMS
It can fail in compression. It it just strong in compression. That's the f'c. Typical f'c used to be 3000psi but now is usually 4000-5000 psi. High strength goes into 10-12k and more.
This post was edited on 10/15/19 at 10:20 pm
Posted on 10/15/19 at 10:18 pm to BigPerm30
quote:
BigPerm30
Are you saying you need a crane to get the bigger crane sections off the truck and assemble them?
Or vise verse when disassembling?
Posted on 10/15/19 at 10:19 pm to TigerstuckinMS
quote:
All those skinny posts in MrLSU's picture, are they basically jackscrews that are put into place, then screwed to extend them so they are jammed between the floors to support the load of the concrete floors until they cure enough to be self-supporting? Then, once the slab is strong enough, they're removed?
Yes, they are re-shores. Typically there are two levels but there was a three foot transfer slab and it needed to be re-shored to the ground.
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