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Old October 1st, 2005, 06:26 PM   #101
spyguy
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Sweet.
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Old October 1st, 2005, 08:42 PM   #102
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Quote:
Originally Posted by kayosthery
This should go fairly well, there is no chance of a blowout because they are pouring all the way up to the sheet piling and the laborers and finishers will be there to grade the top and smooth it out later.
Great explanation of what's going on down there, but what does this sentence mean? What exactly is a blowout?
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Old October 1st, 2005, 09:08 PM   #103
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Wow, more pictures, this time from Pandemonious at 9:15 AM:



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Old October 2nd, 2005, 09:56 PM   #104
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So how long until it actually starts to to move upwards and we see the crane installed?
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Old October 2nd, 2005, 10:48 PM   #105
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Is the construction on schedule, behind, or ahead?
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Old October 3rd, 2005, 12:12 AM   #106
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Ahead I think. I remember hearing one month ahead even. But don't take my word for it.
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Old October 3rd, 2005, 12:57 AM   #107
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richardson... we were supposed to expect to see the tower back up street-level around February. I'm not sure where we are in terms of the schedule, but, I would guess that figure to be somewhat accurate (give or take).
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Old October 3rd, 2005, 02:42 PM   #108
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Quote:
Originally Posted by HowardL
Great explanation of what's going on down there, but what does this sentence mean? What exactly is a blowout?
A blowout occurs when the pressure of "fluid" concrete being placed in the forms is greater than what the formwork can handle. The hardware being used to connect the forwork together cannot handle the load, so it fails and the formwork splits open and makes a big mess in all the places you don't want it to. If I remember correctly, concrete should only be placed at a rate of 3 ft lifts per hour. However, nobody follows this rule because every construction company would lose money doing so. McHugh is pouring the mat slab all the way up to the edges of the sheet piling, which leaves no chance of a blowout.

If that is the base of the elevator core they just poured, the next step is to bring in the self-rising forms for the elevator core. The tower crane will also start being erected shortly.
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Old October 3rd, 2005, 07:40 PM   #109
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TEMPO UPDATE
Trump's Big Pour

It took 30 trucks 600 trips to make concrete history

By Mike Conklin
Tribune staff reporter
Published October 3, 2005

Builders of the Trump Tower, which will be the world's tallest concrete-reinforced building when it's completed in 2009, got serious over the weekend about their concrete.

Really serious.

In what contractors called the "big pour," trucks worked round-the-clock for nearly 24 hours to bring 5,000 cubic yards of concrete to the site and dump it into a single hole called the mat. This steel-reinforced opening that measures 200 feet long, 66 feet wide and 10 feet deep will be a below-ground level anchor for the 92-story building.

Unlike the Sears Tower, Aon Center and Hancock Building, which are all steel-reinforced, the Trump Tower is using concrete because there is less room available on the site for the foundation. Without the concrete mat, say architects, the structure could never climb as high and still stay as thin.

"This mat is the heart of the building," said McHugh Construction's Dale Hendrix, a 45-year senior vice president -- and veteran in concrete -- who coordinated the pour. "This was a really unique challenge, something you're going to look back on some day and be proud of. I love this."

The Trump Tower has a $600 million construction budget, and the concrete-only portion handled by McHugh will be an estimated $130 million of that total. The building is expected to require 180,000 cubic yards of concrete when it is completed, but at no point, said Hendrix, will anything be as complex as the weekend's big pour.

Highly anticipated by everyone on the Trump project, the big pour kicked off Friday at 12:10 p.m., a few minutes early. As pedestrians above walked by mostly unaware, workers scrambled to witness the convoy's first ready-mix truck -- its huge drum turning -- rumble onto the Lower North Wabash Avenue site.

This was the first of 30 green, orange and white concrete trucks used non-stop by Prairie Material Sales Inc., the Bridgeview-based supplier. Before this marathon of mixing ended late Saturday morning, the fleet would make 600 trips between the company's sprawling distribution site at Chicago Avenue and Halsted Street and the mat. An observer clocked the last delivery at 10:45 a.m.

Prairie, the largest privately owned ready-mix company in the U.S., used two shifts of drivers, and each truck carried up to 9 cubic yards, or slightly more than 1,800 gallons.

"We've had projects where maybe we've taken more concrete to one location -- O'Hare for one, but never with all the specifications like this," said Gerry Krozec, a Prairie vice president. "This [pour] involved things that have never been done in this business."

The sunny yet cool weather was perfect for the pour, which required a special formula for the cement -- the powderlike material mixed with sand, gravel or crushed stone, and water -- to create the concrete. Because this was the first time the formula has been used, chemists were on hand to test the concrete's consistency and temperature throughout the pour in a makeshift laboratory.

Conventional concrete is made to sustain weight at 7,000 pounds, or less, per square inch (psi). For the Trump Tower mat, where it will have to support the building's 360,000-ton bulk, it was specially mixed for 10,000 pounds psi, according to Krozec. This was done by making a concrete mix that was cooler and thicker than normal.

High-powered, portable lights ringed the pour as it continued through the night. McHugh and Prairie workers used suites booked at the Hotel 71, just across the Chicago River from the site, to catch a few winks during the long hours of work.

The fleet of Prairie trucks assembled four hours before their scheduled 12:30 p.m. site arrival at Prairie's distribution center, where they were gassed, warmed up and filled with concrete.

Their route, a five-mile round trip, took them east on Chicago Avenue past the old Montgomery Ward headquarters, under elevated tracks, past Moody Bible Institute and south on Clark Street, where they turned east on Kinzie Street to continue eastward into the street's lower level and onto the site.

On the return, Hendrix was careful to have the trucks go east on Kinzie to Lower Michigan Avenue, where they turned north and worked their way back to the Prairie premises to reload via Grand Avenue and Dearborn Street.

"It would've been closer, and probably easier to maneuver, if they'd used Rush Street instead of Lower Michigan," he said, "but that would've taken them within a few feet of an outdoor restaurant [Phil Stefani's 437 Rush] while everyone was eating. That's a trick you learn in this business."

When the Prairie drivers arrived at the Trump site, they proceeded to one of two points ringing the mat. They dumped the concrete on conveyor belts that could carry as much as 170 yards per hour.

Then McHugh workers spread the material across the mat opening and, when the pour was complete, covered it with protective sheets of Styrofoam and plywood purchased for this one-time use. They will remain in place for at least a month.

There still is plenty to be poured -- 5,000 yards of concrete is a small percentage of the 180,000 total to be used in the project. But now that the mat is complete, the concrete will flow on a floor-by-floor basis. It will take a custom-built pump imported from Germany to handle the job on the high-rise's uppermost levels.

"Some of our pumps would have to struggle to get it that high," said Hendrix. "That won't be a problem with this new one."

According to Emporis, a construction research database service, the tallest concrete building in the world now is CITIC Plaza in Guangzhou, China, which is 80 floors.

Chicago has seen its share of record-holders: the 64-story Two Prudential Plaza, completed in 1990, was the world's tallest reinforced concrete building until it was supplanted by the 65-story building at 311 South Wacker Drive completed the same year.

Decades earlier, Marina City, just a block from Trump Tower, held the title as the world's tallest concrete-reinforced structure. The two distinctive 60-story towers were a four-year project completed in 1964 -- and Marina City was the first job Hendrix worked in construction.

- - -

By the numbers

5,000 cubic yards of concrete poured for the mat

180,000 cubic yards of concrete to be used in total

30 trucks carried the concrete to the site

7,000 pounds per square inch is the strength of conventional concrete

10,000 pounds per square inch is the strength of the concrete for this mat


Copyright © 2005, Chicago Tribune
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Old October 3rd, 2005, 10:40 PM   #110
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Neat article.
No mention of Water Tower Place, WTRCB 1975-1990. The building get no respect at all.
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Old October 3rd, 2005, 10:57 PM   #111
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I had heard it rumored that the columns and walls supporting the extreme lowest floors will consist of 18,000 psi concrete. This would have been a primary reason for obtaining a special pump that could handle that type of job. The higher the strength of concrete the thicker and less "fluid" the mix, which leads to more clogs in the vertical pipe that brings it up the building on its way to the placing boom above the core. So, a stronger pump moves the concrete faster and with more force, allowing it to travel all the way to the top.
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Old October 3rd, 2005, 11:30 PM   #112
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Great article that summarized quite a bit.
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Old October 4th, 2005, 07:47 AM   #113
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The fresh mat pour hasn't slowed construction down at all. I took these this afternoon.

Steel rebar rising for the eventual formation of columns - 2005-10-3


Formwork being positioned on the recently completed mat foundation - 2005-10-3


Lowering a steel rebar cage into place that will eventually become part of a column - 2005-10-3
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Old October 4th, 2005, 09:51 PM   #114
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Thanks again for the pics. I used to build these things and I get nostalgic everytime these pics are posted.
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Old October 11th, 2005, 07:57 PM   #115
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The Tribune's web cam currently shows a pump truck pumping concrete for what I assume are the columns. Can anyone snap some pics on their lunch hour today?
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Old October 11th, 2005, 11:07 PM   #116
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Please! More Pics! More Pics! More Pics!
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Old October 12th, 2005, 02:52 AM   #117
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I will be in town by December so I hope a lot of progress is made by then. It might be worth hauling my luggage all the way to the Michigan Avenue bridge from Union Station just to see this. You got two months guys! Chop chop!
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Old October 12th, 2005, 02:45 PM   #118
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Looking good....
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Old October 13th, 2005, 12:14 AM   #119
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Quote:
Originally Posted by uberalles
Please! More Pics! More Pics! More Pics!
Okay, okay, geezzzzzz.......Aren't we demanding?

I took these yesterday (10/11/05)

Pouring concrete that will help to form the walls of the core - 2005-10-11


View into the construction site - 2005-10-1


Excavating dirt, clay and other debris from the site - 2005-10-11


Iron workers installing and tying steel rebar - 2005-10-11


Excavators digging out more of the site - 2005-10-11


Workers spreading recently delivered gravel - 2005-10-11
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Old October 13th, 2005, 01:22 AM   #120
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sweet! thanx Butler!
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