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  #2341  
Old Posted Apr 19, 2017, 12:40 PM
chief56 chief56 is offline
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Originally Posted by petey2428 View Post
I thought the bedrock is pretty high in new york, so you don't have to go down deep unless it's for rock anchors. For example, 1WTC in New York sits pretty much on bedrock. You don't have that condition in Chicago.

PT construction is the standard for high rise residential construction in Chicago. You can curve the tendons to avoid conflict with conduits/pipes/etc.
Allows for less reinforcing in the slab, resulting in thinner slabs and the heigher floor to ceilings people want in residential buildings.

An easy way to tell where bedrock in NYC is look where all the tall buildings are. Southern end of the island and middle.
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  #2342  
Old Posted Apr 22, 2017, 4:52 PM
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4/21

Thanks Harry!

Goodbye wood under the new Upper Wacker extension



Could there be just one more floor to put up before being even with Upper Wacker...







Anyone know what the blue poles are for?






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  #2343  
Old Posted Apr 23, 2017, 1:55 AM
Bombardier Bombardier is offline
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Anyone know what the blue poles are for?
Those are for the carpenters installing the decking to tie off to as a means of fall prevention. If you go there during a day they are placing decking, you will see the carpenters tie off to the poles.
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  #2344  
Old Posted Apr 23, 2017, 3:39 AM
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Last edited by The Lurker; Apr 23, 2017 at 4:58 AM.
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  #2345  
Old Posted Apr 23, 2017, 12:19 PM
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Nice shots guys!
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  #2346  
Old Posted Apr 26, 2017, 12:47 AM
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Went to my first Wanda property in Shanghai last night. Nothing much to report but damn..big. Almost all the stores in the mall portion was food. World's biggest kid's ball pit too..
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  #2347  
Old Posted Apr 26, 2017, 6:34 AM
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  #2348  
Old Posted Apr 26, 2017, 8:59 AM
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Today
Is that other buiding currently in a reclad ?
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  #2349  
Old Posted Apr 26, 2017, 9:28 AM
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Those parking garge slabs are kind of small aren't they? Maybe I just dont have a good perspective. At 345 parking spaces there has got to be a crap ton of floors of parking on the east side of the project. Anyone got a floor count for the garage?
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  #2350  
Old Posted Apr 26, 2017, 2:03 PM
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Quick Snaps of Vista and OBP


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  #2351  
Old Posted Apr 26, 2017, 9:05 PM
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Is that other buiding currently in a reclad ?
If you're referring to the building directly east of Vista, no.
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  #2352  
Old Posted Apr 28, 2017, 5:37 PM
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Pole question

If the blue poles are for fall prevention for carpenters why did they leave them in place as they pour concrete today? I don't recall any other floor where they did that for this project.

Quote:
Originally Posted by Bombardier View Post
Those are for the carpenters installing the decking to tie off to as a means of fall prevention. If you go there during a day they are placing decking, you will see the carpenters tie off to the poles.
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  #2353  
Old Posted Apr 28, 2017, 5:40 PM
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^they anchor to the concrete deck below and will now rise with each successive deck pour. This was the first floor there was enough structure underneath to use them.
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  #2354  
Old Posted May 1, 2017, 7:07 AM
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I'm not exactly sure what the blue poles are about.


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  #2355  
Old Posted May 1, 2017, 11:58 AM
kayosthery kayosthery is offline
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Originally Posted by BVictor1 View Post
04/28/17

I'm not exactly sure what the blue poles are about.


The blue poles hold a horizontal life line. The workers can attach a lanyard or retractable to the line when exposed to a fall; usually the carpenters installing the deck formwork.
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  #2356  
Old Posted May 1, 2017, 2:13 PM
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Originally Posted by kayosthery View Post
The blue poles hold a horizontal life line. The workers can attach a lanyard or retractable to the line when exposed to a fall; usually the carpenters installing the deck formwork.
Interesting.....

And I'm guessing that lip-like formwork prevents the poles from being permanent and they'll slide back down through the floor.
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  #2357  
Old Posted May 1, 2017, 3:13 PM
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Interesting.....

And I'm guessing that lip-like formwork prevents the poles from being permanent and they'll slide back down through the floor.
They are raised as the floors set, the hole keeps them from getting stuck in the concrete. On some sites the holes have been filled in after the floors above have been completed.
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  #2358  
Old Posted May 1, 2017, 4:03 PM
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Originally Posted by kayosthery View Post
The blue poles hold a horizontal life line. The workers can attach a lanyard or retractable to the line when exposed to a fall; usually the carpenters installing the deck formwork.
Not that it matters in the whole course of events, but why have at least one of the poles in the middle of the slab, fall away from the edges.
Strange that none of the photos show any one actually connected to the poles, even the ones somewhat close to the edge.
Unless these poles are attached to something on the floor under the one actually being worked on, that would mean that the poles aren't attached to anything other then the form work, 3/4" plywood, which doesn't seem like that big of a support.
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  #2359  
Old Posted May 1, 2017, 4:37 PM
kayosthery kayosthery is offline
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Originally Posted by City Wide View Post
Not that it matters in the whole course of events, but why have at least one of the poles in the middle of the slab, fall away from the edges.
Strange that none of the photos show any one actually connected to the poles, even the ones somewhat close to the edge.
Unless these poles are attached to something on the floor under the one actually being worked on, that would mean that the poles aren't attached to anything other then the form work, 3/4" plywood, which doesn't seem like that big of a support.
The slab formwork in the picture is complete for those respective slabs. The handrail is in place where McHugh is breaking the pour between the West and East portions of the building. While the work was in progress those blue poles were actually in a more "useful" position.

As I'm looking at the pics more closely, they may not be an actual horizontal lifeline, but rather just a taller tie-off point to control fall distance.

The poles are actually anchored into the slabs below, as Harry mentioned. They are pulled up after each pour and the slab is filled in, or they exist in a mechanical opening that's in the same place on each slab.
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  #2360  
Old Posted May 1, 2017, 5:36 PM
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Originally Posted by City Wide View Post
Not that it matters in the whole course of events, but why have at least one of the poles in the middle of the slab, fall away from the edges.
Strange that none of the photos show any one actually connected to the poles, even the ones somewhat close to the edge.
Unless these poles are attached to something on the floor under the one actually being worked on, that would mean that the poles aren't attached to anything other then the form work, 3/4" plywood, which doesn't seem like that big of a support.
These Union folk are pretty anal about their safety measures - often both the GC and the Union will have safety inspectors on site. I will dig up some shots of them using the safety harnesses and fall prevention, when working below grade on the foundation mat.
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