CHICAGO | St. Regis Chicago (Vista) | 1,191 FT | 101 FLOORS

[Zerton]

I think we said the same thing. Nice pics!

[The Lurker]

Thanks for all the great photo updates everybody. The documentation of this project is every bit as impressive as the construction progress so far. I'll be in town next weekend and I'll be sure to snap a few to add to the pool.

[deebirch]

2017-04-13

[J_M_Tungsten]

Today

[harryc]

Office worker - great set of closeups.
A few from Apr 12

[City Wide]

I have no hardly any experience with PT work, just a basic understanding of the core principals------the cables seem to start off nice and neat and well organized, but in the 2nd to last photo above it looks like something I'd see in a third world country, groups of cables bundled together, running right against vertical conduit, irregular spacing. The whole thing just looks sloppy, is this the norm for PT work?

[officeworker]

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?

[Bombardier]

Originally Posted by officeworker

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.

[The Lurker]

[officeworker]

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.

Originally Posted by Bombardier

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.

[Skyisnolimit]

Originally Posted by J_M_Tungsten

Today

Is that other buiding currently in a reclad ?

[spidey7312]

Originally Posted by Skyisnolimit

Is that other buiding currently in a reclad ?

If you're referring to the building directly east of Vista, no.

[KWILLSKYLINE]

I know this may be pretty basic to you engineer's but how does the complication of this site compare to those going on in new york? Obviously this isnt as massive as hudson yards but how do you compare this to some of those central park projects going on? I know, random and vague question, but i was just over at the vista site this weekend for the first time and I couldnt belive how gigantic it was in person.

[LouisVanDerWright]

^^^ I'm not an engineer, but I'm not sure there is any way to answer that question. The best answer is: They are different.

This is a huge footprint next to a multi level roadway that will have connections through the building. Compare that to the needles they are building in NYC which have a tiny site often excavating down deep into the ground (rather than just building up from here).

So on one hand you have tons of room to maneuver on this site, but complications like roadways running through the site or cassion foundations. On the other you have extremely tight sites for extremely narrow buildings, but it's also a much smaller floorplate and there's no roadway to worry about.

So they are totally different types of complexity, but that's what engineers do: find the best solution to each project's unique requirements.

[petey2428]

Originally Posted by LouisVanDerWright

^^^ I'm not an engineer, but I'm not sure there is any way to answer that question. The best answer is: They are different.

This is a huge footprint next to a multi level roadway that will have connections through the building. Compare that to the needles they are building in NYC which have a tiny site often excavating down deep into the ground (rather than just building up from here).

So on one hand you have tons of room to maneuver on this site, but complications like roadways running through the site or cassion foundations. On the other you have extremely tight sites for extremely narrow buildings, but it's also a much smaller floorplate and there's no roadway to worry about.

So they are totally different types of complexity, but that's what engineers do: find the best solution to each project's unique requirements.

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.

[chief56]

Originally Posted by petey2428

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.

[BVictor1]

04/28/17



















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

[kayosthery]

Originally Posted by BVictor1

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.

[aaron38]

Originally Posted by BVictor1

04/28/17

Is upper Wacker still being extended or is it done?

[KWILLSKYLINE]

Yeah, I kind of figured it was a silly question to ask after I posted it. Apples to oranges. haha.