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  #1721  
Old Posted Sep 23, 2016, 1:50 PM
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^ awesome shots, solar! thanks for posting, as always.

what a great moment in time to photo-document; the birth of a supetall.
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  #1722  
Old Posted Sep 23, 2016, 7:31 PM
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A day late -

Still getting stuff set up, 2 upright rigs doing the small stuff around the periphery, putting together a larger (Manitowac 999) rig for the big stuff.

Drill baby Drill




changing drill bits


gotta have just the right size re-bar.






Some assembly required.


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  #1723  
Old Posted Sep 23, 2016, 9:00 PM
LouisVanDerWright LouisVanDerWright is offline
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Nice, I thought it looked like a bigger one. Guess those 20' cages won't be light, makes sense. Gonna be a good show.
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  #1724  
Old Posted Sep 23, 2016, 10:45 PM
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Originally Posted by LouisVanDerWright View Post
Nice, I thought it looked like a bigger one. Guess those 20' cages won't be light, makes sense. Gonna be a good show.
More than the weight it's the torque required to get down to rock, also not sure if the upright rigs can reach over far enough for the bigger caissons. That said the crawler from ALL is probably the general purpose crane, until the tower crane is installed.
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  #1725  
Old Posted Sep 23, 2016, 11:34 PM
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WOOT Chicago!
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  #1726  
Old Posted Sep 25, 2016, 4:49 PM
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Finally, a new supertall for Chicago! I wish it were taller and had a smaller footprint though. I also wish it looked nicer.
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  #1727  
Old Posted Sep 25, 2016, 5:01 PM
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September 22, 2016
Is this the site of the proposed GEMS Phase II high school? Looks like they were able to "borrow" that land for a staging area, at least for foundation work.
Looks like the property line is roughly where the brick ground covering ends. I guess it will be a while before the school breaks ground.
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  #1728  
Old Posted Sep 25, 2016, 9:17 PM
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Finally, a new supertall for Chicago! I wish it were taller and had a smaller footprint though. I also wish it looked nicer.
Take his coat, get him out!
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  #1729  
Old Posted Sep 26, 2016, 2:22 AM
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Wow, it's finally starting?
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  #1730  
Old Posted Sep 26, 2016, 2:23 PM
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Wow, it's finally starting?
yes.

look at the numerous pictures of caisson rigs drilling into the earth posted on the previous page of this thread for confirmation.
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  #1731  
Old Posted Sep 26, 2016, 2:53 PM
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Take his coat, get him out!
You mean, you don't wish it were taller? This building is essentially three towers of different heights joined together. If they were stacked on top of each other, the total square footage would be unchanged while the cost of construction might not be much higher, and Chicago would again have the tallest building in the Western Hemisphere. It would be very slender, but NYC has plenty of ultra-slender buildings too.
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  #1732  
Old Posted Sep 26, 2016, 3:45 PM
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If they were stacked on top of each other, the total square footage would be unchanged while the cost of construction might not be much higher...
It's not that simple...taller buildings require more of their floor plan to be eaten up by lateral system and elevators and mechanicals....reducing the usable/sellable/rentable floor plan. There are also very expensive foundation concerns when you get very very tall.

There is a reason why the 40 to 60 story apartment building is so ubiquitous in Chicago. It is the sweet spot for a cheap/less complicated lateral system, and caisson foundations that are pretty standard and easy in Chicago's relatively shallow clay layer, while still cramming in lots and lots of area.
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  #1733  
Old Posted Sep 26, 2016, 4:15 PM
Kngkyle Kngkyle is offline
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Originally Posted by pianowizard View Post
You mean, you don't wish it were taller? This building is essentially three towers of different heights joined together. If they were stacked on top of each other, the total square footage would be unchanged while the cost of construction might not be much higher, and Chicago would again have the tallest building in the Western Hemisphere. It would be very slender, but NYC has plenty of ultra-slender buildings too.
The cost of construction would be extraordinarily higher and the usable floor space would be considerably less. This is a business venture not an egomaniacs wet dream.
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  #1734  
Old Posted Sep 26, 2016, 4:25 PM
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Originally Posted by Swicago Swi Sox View Post
It's not that simple...taller buildings require more of their floor plan to be eaten up by lateral system and elevators and mechanicals....reducing the usable/sellable/rentable floor plan. There are also very expensive foundation concerns when you get very very tall.

There is a reason why the 40 to 60 story apartment building is so ubiquitous in Chicago. It is the sweet spot for a cheap/less complicated lateral system, and caisson foundations that are pretty standard and easy in Chicago's relatively shallow clay layer, while still cramming in lots and lots of area.
Question for you: is this the main determinant of Chicago's prevailing building heights (particularly for office towers) in comparison to NY's?

I had always assumed it was about economics rather than engineering, but I'm curious.
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  #1735  
Old Posted Sep 26, 2016, 4:30 PM
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Wow, it's finally starting?
Yes, it's long overdue! Can't wait to be built.
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  #1736  
Old Posted Sep 26, 2016, 4:34 PM
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To 10023's comment:

New York has more wealth than Chicago. By an incredible amount. As a result, it makes sense to build tall, thin skyscrapers because the sale price or rent price can support the tall construction premiums.

On a side note: those point towers in NY benefit a lot from their ability to still use scissors stairs (not allowed anymore in Chicago and most places for that matter). Makes a huge difference. I would have thought they would have been outlawed after 911. But they were not.
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  #1737  
Old Posted Sep 26, 2016, 4:36 PM
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^ what!?! scissors stairs are still allowed in NYC?

i thought they were abolished in all building codes after 9/11.
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  #1738  
Old Posted Sep 26, 2016, 4:42 PM
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What is so bad about scissor stairs? It's just two sets of stairs placed into each other to save space, how is it different if they were in separate parts of the building?
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  #1739  
Old Posted Sep 26, 2016, 5:24 PM
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What is so bad about scissor stairs? It's just two sets of stairs placed into each other to save space, how is it different if they were in separate parts of the building?
It appears that in NYC you could count the 2 separate sets of stairs in a scissor configuration as 2 routes for fire escape - obviously not 2 separate routes.

This article (from 2008) says they are no longer allowed http://nymag.com/realestate/features/47812/
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  #1740  
Old Posted Sep 26, 2016, 5:57 PM
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Originally Posted by Kngkyle View Post
The cost of construction would be extraordinarily higher and the usable floor space would be considerably less. This is a business venture not an egomaniacs wet dream.
It depends on what economic factors were considered by the bean counters. If this were the tallest building in the Western Hemisphere, tenants might be willing to pay higher rents. Also, as discussed recently in this thread about the former Chicago Spire site, there are tricks to make a major attraction like "The Tallest Building Outside Asia" extremely profitable. Finally, how much money would be saved by reducing the footprint of the building (and hence area of the lot) by two thirds? Real estate in downtown Chicago isn't cheap.
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