CHICAGO | One Chicago | 971 FT & 574 FT | 78 & 49 FLOORS - Page 92

The Lurker · #**1821** Posted **Nov 18, 2019, 5:10 AM**

That black mobile crane is colossal. I wonder how it compares to the one at the Tribune Tower.

harryc · #**1822** Posted **Nov 20, 2019, 1:21 AM**

Nov 18

Additional soil testing outside of the wall ?

cozy · #**1823** Posted **Nov 20, 2019, 10:45 AM**

marothisu · #**1824** Posted **Nov 21, 2019, 12:20 AM**

The shorter tower received its full building permit yesterday

harryc · #**1825** Posted **Nov 27, 2019, 3:51 AM**

Quote:

Originally Posted by marothisu

The shorter tower received its full building permit yesterday

Seems odd the way they delay this until well after anything could reasonably be changed. Has a permit ever been denied at this stage ?

harryc · #**1826** Posted **Nov 27, 2019, 4:12 AM**

Nov 26

Chicago | One Chicago by Harry Carmichael, on Flickr

Chicago | One Chicago by Harry Carmichael, on Flickr

Finishing the ceiling ? - is this is the "mud coat" that the floor will be built upon.

Chicago | One Chicago by Harry Carmichael, on Flickr

Chicago | One Chicago by Harry Carmichael, on Flickr

Secant Wall - with tie-ins for the eventual floor beams

Chicago | One Chicago by Harry Carmichael, on Flickr

I take it this isn't a Jewish company

Chicago | One Chicago by Harry Carmichael, on Flickr

Cleaning with feeling

Chicago | One Chicago by Harry Carmichael, on Flickr

Note the yellow junction box set in the bottom of the slab - they will be digging out from the bottom.

Chicago | One Chicago by Harry Carmichael, on Flickr

Chicago | One Chicago by Harry Carmichael, on Flickr

A future Garage

Chicago | One Chicago by Harry Carmichael, on Flickr

Chicago | One Chicago by Harry Carmichael, on Flickr

In the background you can see the 2 excavators pulling clay out from the bottom of the shaft.

Chicago | One Chicago by Harry Carmichael, on Flickr

aaron38 · #**1827** Posted **Nov 27, 2019, 2:01 PM**

My word, they are flying, working like the world is ending.

cozy · #**1828** Posted **Nov 27, 2019, 3:26 PM**

Quote:

Originally Posted by aaron38

My word, they are flying, working like the world is ending.

they won't find any complaints here

awesome update harry, love your captions especially

chicagodeckerdude · #**1829** Posted **Nov 27, 2019, 5:13 PM**

Quote:

Originally Posted by aaron38

My word, they are flying, working like the world is ending.

Get it built before another possible economic collapse maybe!

Bombardier · #**1830** Posted **Nov 28, 2019, 12:46 AM**

Quote:

Originally Posted by harryc

Finishing the ceiling ? - is this is the "mud coat" that the floor will be built upon.

Chicago | One Chicago by Harry Carmichael, on Flickr

Yes, that is the mud mat being placed.

And this is a section of the permanent slab being cast on top of the mud mat:

Quote:

Originally Posted by harryc

Nov 26

Chicago | One Chicago by Harry Carmichael, on Flickr

harryc · #**1831** Posted **Nov 28, 2019, 3:31 AM**

Quote:

Originally Posted by Bombardier

Yes, that is the mud mat being placed.

And this is a section of the permanent slab being cast on top of the mud mat:

Haven't seen them smoothing out a mud-mat to this degree before. It appears that once the floor sets the mud-mat will be chipped off (after the next level is dug out). I had expected normal forms just placed directly on the soil.

Fvn · #**1832** Posted **Nov 28, 2019, 3:39 AM**

Quote:

Originally Posted by harryc

Haven't seen them smoothing out a mud-mat to this degree before. It appears that once the floor sets the mud-mat will be chipped off (after the next level is dug out). I had expected normal forms just placed directly on the soil.

I think they put more time into smoothing it out because it's essentially the formwork for the ceiling of the floor below, so it can't be as rough as mud mats usually are

Bombardier · #**1833** Posted **Nov 28, 2019, 1:29 PM**

^Yes, the mud mat is the formwork for the slab above and gets removed during the mining process. They cannot begin mining until the L1 slab is cast as that creates the top of the diaphragm and supports the cap beam at the top of the secant wall. After L1 is cast, the berm that is currently supporting the secant wall can be removed and LL1 can be placed all the way to the secant wall. Then LL2 is mined out and the process is repeated (place LL2 mud mat, place LL2 permanent slab, mine out under LL2 for LL3 slab). There are 4 lower levels, so the full process won't be complete until the towers are well underway (structure complete in the 20's or 30's).

cozy · #**1834** Posted **Nov 29, 2019, 4:54 PM**

Another permit has been issued, this time to start going up.

https://www.chicagocityscape.com/per...?pid=100829254

SolarWind · #**1835** Posted **Nov 30, 2019, 2:45 PM**

November 25, 2019

MPLS_Const_Watch · #**1836** Posted **Dec 2, 2019, 3:20 AM**

Very cool thread, thank you to all who have posted such comprehensive updates. I apologize if this has been covered, I've only been following this thread intermittently-- how many total below-grade levels are there, and how many are being excavated traditionally vs. built top-down? Are there floor plans publicly available?

HomrQT · #**1837** Posted **Dec 2, 2019, 4:07 AM**

Quote:

Originally Posted by MPLS_Const_Watch

Very cool thread, thank you to all who have posted such comprehensive updates. I apologize if this has been covered, I've only been following this thread intermittently-- how many total below-grade levels are there, and how many are being excavated traditionally vs. built top-down? Are there floor plans publicly available?

Page 1 of this thread might have what you are looking for.

harryc · #**1838** Posted **Dec 4, 2019, 4:14 AM**

Dec 3

Chicago | One Chicago by Harry Carmichael, on Flickr

The floor/ceiling waiting to be extended.

Chicago | One Chicago by Harry Carmichael, on Flickr

This would make a very low ceiling - area for planters ?

Chicago | One Chicago by Harry Carmichael, on Flickr

Waiting for the horizontal tie-in

Chicago | One Chicago by Harry Carmichael, on Flickr

Tower columns

Chicago | One Chicago by Harry Carmichael, on Flickr

Sumps waiting to be installed

Chicago | One Chicago by Harry Carmichael, on Flickr

Prepping the secant wall for a floor plate - notched the round parts, initial holes for re-bar marked and drilled.

Chicago | One Chicago by Harry Carmichael, on Flickr

A climbing form takes shape

Chicago | One Chicago by Harry Carmichael, on Flickr

Bombardier · #**1839** Posted **Dec 4, 2019, 10:30 AM**

Quote:

Originally Posted by harryc

Dec 3

This would make a very low ceiling - area for planters ?

Chicago | One Chicago by Harry Carmichael, on Flickr

Looks to be too big for planters. My guess is that is the storm detention tank and it is shallow enough for cars to drive underneath it in the parking level below.

Also, looks like the 3rd tower crane base was set. Looks like we will have two projects in the city with 3 active tower cranes before the end of the year. 2020 is going to be a fun year for construction watchers in Chicago!

harryc · #**1840** Posted **Dec 4, 2019, 1:02 PM**

Quote:

Originally Posted by Bombardier

Looks to be too big for planters. My guess is that is the storm detention tank and it is shallow enough for cars to drive underneath it in the parking level below.

Also, looks like the 3rd tower crane base was set. Looks like we will have two projects in the city with 3 active tower cranes before the end of the year. 2020 is going to be a fun year for construction watchers in Chicago!

The tower base is just sitting there - the gray area will be woven into a mat when it finds it's final home.

[ edit : thought I had posted this one ]

Chicago | One Chicago by Harry Carmichael, on Flickr