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Old August 5th, 2009, 02:50 PM   #9661
Ebola
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As far as I know, the new cranes will be used to install the jumbo perimeter steel columns this fall.

Ok, so to sum things up: there will be the two tower cranes we see now, there will be a third tower crane (according to the program director in the World Trade Center Construction Department), and there will be two crawler cranes for the jumbo colums. Is this right?

The rooftop structural steel will top out in 2011, but I'm not sure when the spire will come.

The north core will catch up to the south one this month, and the steel on both sides of the cores will be equal by the end of September.
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Old August 5th, 2009, 04:52 PM   #9662
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http://rebuildgroundzero.org/webcam/rgz_000.jpg works again !

Not a great view in the morning , a good deal too !
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Old August 5th, 2009, 05:19 PM   #9663
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Holy crap, it looks like a huge chunk of WTC Tower 4 is already at street level.
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Old August 5th, 2009, 06:03 PM   #9664
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Until what point(height) do they usually use Reinforced concrete in construction and then switch to Steel?

Is the core going to be completely made of concrete until the top?
I wonder if Rebar(reinforced concrete) is only going to be used on the bottom floors?
I really dont know much about construction of skyscrapers, can anybody give me a hand?

Last edited by ElCrioyo; August 5th, 2009 at 06:10 PM.
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Old August 5th, 2009, 08:32 PM   #9665
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concrete is always reinforced to some degree. in the case of this building, the core is steel shrouded in concrete. alllllllllllll the way up
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Old August 5th, 2009, 09:09 PM   #9666
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Just one question about the freedom tower,

On this website, and the original design site at skidmore the tower was always listed as having 82 floors. Does the building that's going up now actually have 108 floors or are they just numbering the top floors in the hundreds just for publicity kind of like with the libeskind tower which had 110 "floors". I know it might seem like a silly question but i was just curious


http://www.glasssteelandstone.com/Bu...Detail/439.php
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Old August 5th, 2009, 09:26 PM   #9667
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Quote:
Originally Posted by pattali View Post
http://rebuildgroundzero.org/webcam/rgz_000.jpg works again !

Not a great view in the morning , a good deal too !
Not a great view at all, it looks like the cam is flipped over, pointing to the sky... And why the hell is it pink.
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Old August 5th, 2009, 10:33 PM   #9668
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Quote:
Originally Posted by Hightech Pro View Post
Not a great view at all, it looks like the cam is flipped over, pointing to the sky... And why the hell is it pink.
The color balance is not properly set, since I've seen pink images from this cam for a long time. It's probably pointing in the wrong direction because someone hit it, but they will notice this some day.
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Old August 5th, 2009, 10:43 PM   #9669
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Quote:
Originally Posted by pattali View Post
http://rebuildgroundzero.org/webcam/rgz_000.jpg works again !

Not a great view in the morning , a good deal too !
Looks like we have a skycam in addition to the earthcam

Really though, who runs that site/camera? Surely they can't be so oblivious to the position of their camera
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Old August 5th, 2009, 11:27 PM   #9670
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Quote:
Originally Posted by Jay View Post
Just one question about the freedom tower,

On this website, and the original design site at skidmore the tower was always listed as having 82 floors. Does the building that's going up now actually have 108 floors or are they just numbering the top floors in the hundreds just for publicity kind of like with the libeskind tower which had 110 "floors". I know it might seem like a silly question but i was just curious


http://www.glasssteelandstone.com/Bu...Detail/439.php
The tower will have 86 floors. The top floor is 108. Nobody seems to know for sure, but they might be numbering the floors according to height which causes them to skip numbers when taller floors cause it to get out of sync.
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Old August 5th, 2009, 11:38 PM   #9671
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It looked like they were dumping rocks or something down one of the holes in the top of the concrete on the southern side of the memorial. Anybody know why? It wasn't concrete as far as I can tell, and It got put in via a conveyor belt system of sorts. I have no idea what it was for.
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Old August 6th, 2009, 02:12 AM   #9672
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Quote:
Originally Posted by philvia View Post
concrete is always reinforced to some degree. in the case of this building, the core is steel shrouded in concrete. alllllllllllll the way up
Would it be suffice to say that in this instance the core is a composite/hybrid system, as opposed to traditional reinforced concrete? As i understand it there is quite a difference, but that's what i imagine is the case.

Quote:
Originally Posted by ElCrioyo View Post
Until what point(height) do they usually use Reinforced concrete in construction and then switch to Steel?

Is the core going to be completely made of concrete until the top?
I wonder if Rebar(reinforced concrete) is only going to be used on the bottom floors?
I really dont know much about construction of skyscrapers, can anybody give me a hand?
In very simple terms, the steel provides the tensile strength needed for the concrete to be used in such applications, so building with plain concrete is out of the question.
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Old August 6th, 2009, 04:16 AM   #9673
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http://rebuildgroundzero.org/webcam/rgz_000.jpg



anyone know who's building the cam is in...because isn't that an Academy Award in the reflection?
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Old August 6th, 2009, 05:42 AM   #9674
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Good question.
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Old August 6th, 2009, 08:14 AM   #9675
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I love your avatar.

Anyway, back on topic, has anyone confirmed what the steel laying around is for? Or is it still just speculation?
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Old August 6th, 2009, 08:19 AM   #9676
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Quote:
Originally Posted by Desparye View Post
I love your avatar.

Anyway, back on topic, has anyone confirmed what the steel laying around is for? Or is it still just speculation?
I'm 99% sure that steel is support for a crane that will be placed there. To make sure concrete will not get damaged, they placed steel, and then looks like wood on top of it.
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Old August 6th, 2009, 08:22 AM   #9677
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Quote:
Originally Posted by webeagle12 View Post
I'm 99% sure that steel is support for a crane that will be placed there. To make sure concrete will not get damaged, they placed steel, and then looks like wood on top of it.
I'll take your word for it. Thanks. ^_^
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Old August 6th, 2009, 08:57 AM   #9678
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Thanks. It's for a crawler crane, which will be used to install stuff like the jumbo columns.
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Old August 6th, 2009, 04:30 PM   #9679
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new quarterly report is finally available on

http://www.panynj.gov/wtcprogress/index.html

with lots of infos and details!!!
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Old August 6th, 2009, 09:29 PM   #9680
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Port Authority meets 19 WTC Building Milestones






... but screws up another 500
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