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Old February 10th, 2010, 02:35 AM   #12941
Onn
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Quote:
Originally Posted by Zensteeldude View Post
You assume too much.

The PA controls the entire site except the Silverstein towers.

I refer to the Transit Hub.

One would be mistaken to assume it's just a pretty building above grade. It is probably the single most important (and most impressive) part of the WTC rebuilding, and it is going forward.
Oh okay, I got ya.
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Old February 10th, 2010, 02:52 AM   #12942
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Big snowstorm on the way to NYC. Probably won't be much happening for a while...
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Old February 10th, 2010, 03:48 AM   #12943
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It's snowing.
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Old February 10th, 2010, 04:04 AM   #12944
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Quote:
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I'd think that since the concrete in the core can't go any higher than the lowest part of the crane structure it would always have to lag the erecting steel by a few stories. And so far, the outer steel has been going up as soon as the erecting steel for that level was done.
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You're thinking of the slipforming process which was perfected in the 1980s. That process is ideal for less complex construction that requires little more than a hastily poured concrete service core and steel framing. This tower is more complex and has redundancies designed into it that you won't find in an ordinary tall. I think that there has to be variegated coreplates that disallow dragging the same form up as the framing slowly rises below.
Thank you for your answers. But, according to this announcement, the construction above the base should be more standard:

Quote:
Originally Posted by westmc9th View Post
http://www.panynj.gov/wtcprogress/index.html

(...) The initial 20 floors of the tower consist of a lobby and several mechanical floors, which required more complex construction due to security and the configuration of the floors. The next 69 floors will be standard office floors and will be built at a quicker rate. The tower is scheduled for completion in 2013. (...)
So, the question remains: When the base will be completed, does the concrete core will go beyond the steel structure? (sorry to be so picky, I still wonder why they build the core this way)
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Old February 10th, 2010, 04:25 AM   #12945
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Quote:
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Thank you for your answers. But, according to this announcement, the construction above the base should be more standard:



So, the question remains: When the base will be completed, does the concrete core will go beyond the steel structure? (sorry to be so picky, I still wonder why they build the core this way)
The concrete core well never be above the steel. The steel must be above the concrete core walls in order for the floor steel to bolt to the core steel.

Think of the core as the trunk of a tree and the floors are the branches of the tree, but the branches go up before the trunk.

Last edited by Zensteeldude; February 10th, 2010 at 04:32 AM.
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Old February 10th, 2010, 05:58 AM   #12946
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February 9th, 2010

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Old February 10th, 2010, 07:28 AM   #12947
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Double post sorry about that
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Last edited by kingsc; February 10th, 2010 at 07:46 AM.
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Old February 10th, 2010, 07:39 AM   #12948
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Quote:
Originally Posted by Zensteeldude View Post
The concrete core well never be above the steel. The steel must be above the concrete core walls in order for the floor steel to bolt to the core steel.

Think of the core as the trunk of a tree and the floors are the branches of the tree, but the branches go up before the trunk.
couldn't put it any better. Its snow pretty good out here.
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Old February 10th, 2010, 08:20 AM   #12949
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On the topic of snow, I am very disappointed that while the east coast is getting buried with snow,seattle hasn't had anything except a measly half inch this winter
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Old February 10th, 2010, 12:07 PM   #12950
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On the topic of snow, I am very disappointed that while the east coast is getting buried with snow,seattle hasn't had anything except a measly half inch this winter
Yeah I know.

All your rain came down to Long Beach
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Old February 10th, 2010, 03:03 PM   #12951
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Old February 10th, 2010, 05:36 PM   #12952
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By GreenwichBoy, WNY, 2-10-10.

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Old February 10th, 2010, 08:13 PM   #12953
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Quote:
Originally Posted by Zensteeldude View Post
The concrete core well never be above the steel. The steel must be above the concrete core walls in order for the floor steel to bolt to the core steel.

Think of the core as the trunk of a tree and the floors are the branches of the tree, but the branches go up before the trunk.
I thought I'd remembered that the floor connections to the core steel were outside the concrete, but I might have been hallucinating again. Dang the 60s anyhow.
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Old February 10th, 2010, 08:24 PM   #12954
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that pic in the snow looks great!
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Old February 10th, 2010, 09:22 PM   #12955
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Ewww...
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Old February 10th, 2010, 09:36 PM   #12956
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Well Manhattan recived very little snow last satruday compared to southern Jersey (i live in somerset and didn't get much snow either") ,which is a good thing for 1 WTC.
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Old February 11th, 2010, 01:47 AM   #12957
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Quote:
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Well Manhattan recived very little snow last satruday compared to southern Jersey (i live in somerset and didn't get much snow either") ,which is a good thing for 1 WTC.
On Saturday, here in Philly we got 28.5 inches of snow -- the second highest amount in a 24 hour period since they started recording these statistics 125 years ago. Today we are getting up to 2 more feet of snow. Philly is 90 miles southwest of NYC.
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Old February 11th, 2010, 01:56 AM   #12958
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I wished it snowed in my country too here in Portugal the only place we have snow is in the mountains
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Old February 11th, 2010, 02:31 AM   #12959
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yeah its been pretty bad all day today (wednesday). around half a foot right now, but its supposed to snow through the evening.
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Old February 11th, 2010, 05:31 AM   #12960
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Quote:
Originally Posted by Zensteeldude View Post
The concrete core well never be above the steel. The steel must be above the concrete core walls in order for the floor steel to bolt to the core steel.
Think of the core as the trunk of a tree and the floors are the branches of the tree, but the branches go up before the trunk.
Interesting, and very helpful!
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