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Old January 8th, 2008, 01:28 PM   #4661
harryc
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Quote:
Originally Posted by micrip View Post
...not to sound dumb here, but I'm not an expert on construction. I know what a slurry wall is, but what the heck is a secant? The only definition I know is that it is a trig function.
A fine example from OMPW


Used to build a wall in the ground, many many caissons will be drilled - just about touching. Then a caisson will be drilled between each ( taking a secant out of the neighbors ). In the end you have a deep wall in the ground and can excavate the earth on one side, while the river stays on the other side.

You ca see the scale at CS from the holes in the guide wall.


[ more secant photos http://picasaweb.google.com/harry.r....CaissonsSecant ]
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Old January 8th, 2008, 01:47 PM   #4662
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yes. but you'd have to admit that the party is over when the spire rises higher than their windows and they kiss their views good bye.
I'd say a view of the Spire is a pretty good consolation.
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Old January 8th, 2008, 03:27 PM   #4663
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Deep Slurry wall

After further study and discussion it appears that this is 1/2 of the cage, and 1/2 of the 70' + deep wall, hard to grasp the scale sometimes.

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Old January 8th, 2008, 04:22 PM   #4664
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stunning update as always harry, you do a fantastic job
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Old January 8th, 2008, 04:56 PM   #4665
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Quote:
Originally Posted by Ch.G, Ch.G View Post
I'd say a view of the Spire is a pretty good consolation.
Agreed. I dont think many people will be missing their unobstructed view of upper and lower LSD.
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Old January 8th, 2008, 08:02 PM   #4666
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how deep is the slurry wall that is in front of tha water ? and how deep is the water in that region.?
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Old January 8th, 2008, 08:12 PM   #4667
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Harry...thanks!
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Old January 8th, 2008, 08:39 PM   #4668
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Quote:
Originally Posted by micrip View Post
...not to sound dumb here, but I'm not an expert on construction. I know what a slurry wall is, but what the heck is a secant? The only definition I know is that it is a trig function.
They are also known as "continuous bore pile walls" or "continuous piled walls"
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Old January 8th, 2008, 11:23 PM   #4669
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Wonderful updates!..
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Old January 9th, 2008, 12:01 AM   #4670
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Case Foundation Tackles Spire Site

The Chicago Spire is a high-profile building in every sense. When it is completed in 2010. it wall be the tallest building in North America at 2.000 ft. Its estimated price tag of $2.4 billion reaches similar elevations. The Spire foundation may be record-breaking, too. The building will have the deepest underground parking garage in Chicago. 7 floors deep at the highly complex 2.2 acre site bordered by the Chicago River. Lake Shore Drive and Lake Michigan. That is the short version of what Case Foundation Company. Roselle. Ill., faced when they signed the foundation construction contract in the summer of 2007.
The Shelboume Development Group, headquartered in Dublin, acquired the site and undertook the mammoth project in mid-2006, and broke ground in September 2007. Case Foundation began work almost immediately. One consulting engineer alludes to the "raft" of issues at the site, among them adjacent buildings, utilities and deep basements. Remediation was also a site factor. Remarkably, the complex foundation occupies only half of the 2.2 acre site. The job included a total of 34 10-ft-diameter 120-ft-deep rock caissons. 14 on the site perimeter and 20 in core rock. Bell caissons were also part of the job. 85 of them. 3 ft diameter and 85 ft deep. Because of the sites proximity to water, a 104-ft-diameter sheet pile, 78-ft-deep cofferdam was placed around the 70-ft-deep circular core to keep the site dry and facilitate top-down construction of the parking garage. This method was chosen because of the water's proximity and associated settlement issues. The top level was built first, then earth beneath excavated, so the next level could be constructed. Each successive floor provided lateral support during construction.
The garage foundation included secant wall 42-in-diameter piles, and a 36-in-thick slurry wall. The work proceeded while two ramps were constructed from north and southbound lanes of Lakeshore Drive to the site, which also abuts a new recreational area. DuSable Park. The foundation work is scheduled to be done by the end of March 2008.
Above ground, the Spire building will transform the Chicago skyline. Spanish architect Santiago Calatrava has described his building design using metaphors such as a snail and a smoke spiral from a campfire lit by Native Americans. However the unusual shape has a highly practical aspect. Each floor of the seven-sided tower will rotate 2.4 degrees above the floor below to complete a full 360 degree rotation over its height. This torqued shape adds stability in high winds and helps dissipate wind forces. Shear walls and a tapering concrete core will also work to reduce wind effects. The Spires 150 floors and 1,200 apartments plus a 56-ft-high atrium will occupy slightly over 278,000 sq m (approximately 3.0 million sq ft) of floor space. The building will sit on seven columns surrounding the egg-shaped atrium.
In addition to Calatrava, the project team includes Perkins & Will, architects of record, Thornton Tomasetti Group, Buro Happold consulting engineers. Walsh Construction. STS AЕСОМ, and Cosentini Associates. The project team is aiming for LEED gold certification at the Spires completion.
At this writing, parties to the project were barred from speaking to the press. More details will follow in the spring issue of DEEP FOUNDATIONS.
http://www.dfi.org/DFM/Winter2008.pdf
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Old January 9th, 2008, 12:05 AM   #4671
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""The foundation work is scheduled to be done by the end of March 2008.""

wow, never thought they'll be so fast!!
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Old January 9th, 2008, 12:46 AM   #4672
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Originally Posted by ZZ-II View Post
""The foundation work is scheduled to be done by the end of March 2008.""

wow, never thought they'll be so fast!!
All they need to do is finish digging out the core then do the 20 piles in them.
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Old January 9th, 2008, 01:20 AM   #4673
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This is awesome project . It will really fresh up skyline of Chicago with this ultra modern look .
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Old January 9th, 2008, 01:27 AM   #4674
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whata stuning pictures, and a lot o lot of mud, man construction is hard
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Old January 9th, 2008, 02:30 AM   #4675
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The foundation will be finished earlier than I expected.
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Old January 9th, 2008, 03:35 AM   #4676
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Great job Harry!
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Old January 9th, 2008, 09:18 AM   #4677
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Quote:
Originally Posted by Ted Ward View Post
They are also known as "continuous bore pile walls" or "continuous piled walls"
...thank you!!!

That whole site is going to be excavated by March?
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Old January 9th, 2008, 02:04 PM   #4678
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Originally Posted by LYNX View Post
http://www.dfi.org/DFM/Winter2008.pdf

Because of the sites proximity to water, a 104-ft-diameter sheet pile, 78-ft-deep cofferdam was placed around the 70-ft-deep circular core to keep the site dry and facilitate top-down construction of the parking garage. This method was chosen because of the water's proximity and associated settlement issues. The top level was built first, then earth beneath excavated, so the next level could be constructed. Each successive floor provided lateral support during construction.
It seems this plan has changed. The central core is being excavated and supported by concrete rings not by a top down garage structure. Sure looks bottom up.
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Old January 9th, 2008, 02:50 PM   #4679
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It seems this plan has changed. The central core is being excavated and supported by concrete rings not by a top down garage structure. Sure looks bottom up.
Actually this was discussed earlier in this thread. The core has to be built first to support the building but the parking garage itself (area around the core) will be built "top down". The center core and the perimeter core borings which all go to bedrock will support the "top down" construction of the garage.
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Old January 9th, 2008, 04:31 PM   #4680
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i love this project, really i do!the only concern i have is this: aren't the surfaces too muddy?the building site is so close to a lake...
by the way well done Harry!do you work at it or what?here in italy we have so many issues in taking pictures of building sites because workers here think we may be thieves on recon...do you have the same problem there too?
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