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Old May 13th, 2012, 11:21 PM   #10801
no1xc
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Quote:
Originally Posted by Nordschleife View Post
The tower and the podium are built on two separate slabs, since the tower part hasn't stopped sinking yet (several months ago, it is anticipated an another 8-11 centimeter or so), they couldn't fill the gap between those two slabs, therefore the construction of the podium is delayed.
Building the whole building on two slabs and waiting for the tower to stop sinking in order to start building the podium really sound sketchy. How can they ensure the two slabs will sink perfectly to the same level? The podium itself has an enormous weight, therefore it probably will sink too. So how could the rate of sinking possibly be calculated accurately before it was built? If this really is the case, to me, it sounds like cracking floor plates, bursting pipes and a lot more troubles. Maybe the reason why the construction has been delayed so much is because the fancy design is posing too many challenges to the contractor.
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Old May 14th, 2012, 02:40 AM   #10802
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This is why engineers and others are paid so much! They know there shit.
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Old May 14th, 2012, 02:59 AM   #10803
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Quote:
Originally Posted by Eric Offereins View Post
This tower is apparently nut founded on bedrock?
Isn't Shanghai known for having unstable and generally unfavorable ground for constructions (especially skyscrapers)? It's certainly not bedrock and not even sand.

Last edited by Pansori; May 14th, 2012 at 03:08 AM.
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Old May 14th, 2012, 04:20 AM   #10804
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Quote:
Originally Posted by Pansori View Post
Isn't Shanghai known for having unstable and generally unfavorable ground for constructions (especially skyscrapers)? It's certainly not bedrock and not even sand.
It's mud.
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Old May 14th, 2012, 06:17 AM   #10805
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Look how the core has risen - it must be past the 300 metre level.
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Old May 14th, 2012, 09:26 AM   #10806
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Almost but not quite.
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Old May 14th, 2012, 10:27 AM   #10807
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Quote:
Originally Posted by no1xc View Post
It's mud.
I don't get that! Wouldn't the tower slump after x amount of time?
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Old May 14th, 2012, 10:38 AM   #10808
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Actually the mud they have removed for the foundation weighs more than the tower itself. The earth underneath now acts more like a spring, as long as they don't add further weight on it, it would hopefully stop sinking.
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Old May 14th, 2012, 11:08 AM   #10809
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So essentially buildings in Shanghai are 'floating'?
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Old May 14th, 2012, 11:31 AM   #10810
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Don't forget the building sits on hundreds of very deep concrete piles drilled into that mud. At some depths the pressure against these piles is so strong that I believe after piles sunk what they suppose to the pressure provides enough support for the tower.

Anyways the structural engineers for this one is Thornton Tomasetti. They worked on the most challenging towers on earth. Kingdom Tower, Taipei 101, Petronas twins to name a few. See for yourself:

http://skyscrapercenter.com/list.php...nton+Tomasetti

I'm sure as someone already said they know theirs shit
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Old May 14th, 2012, 02:46 PM   #10811
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Old May 14th, 2012, 06:52 PM   #10812
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It has been growing really really really fast
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Old May 14th, 2012, 07:00 PM   #10813
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Quote:
Originally Posted by Pansori View Post
So essentially buildings in Shanghai are 'floating'?
It's more like standing on jell-o.
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Old May 14th, 2012, 08:10 PM   #10814
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soil conditions

Only if you are into foundation-issues:

I did some search on the internet about the soil conditions in Shanghai since there were several remarks about it. As mentioned is bedrock out of reach for the foundations since its around 300 m below groundlevel. But that is also not necessarily since there are deep sandlayers which can be reached with a pile foundation. In the information of ST its mentioned that they use concrete bore-piles up to 62 meters of length. http://www.ctbuh.org/LinkClick.aspx?...language=en-GB The good sand layers resides 65 m and deeper(depending on the location of course since this can fluctuate per location). The next link is a paper in which they show a method to predict the settlement of buildings over time in Shanghai, it cannot be used to compare with the ST project but its shows that it's possible to accurately predict settlement over time http://www.google.nl/url?sa=t&rct=j&...PEP33ADJQT7OTA

So there are layers of sand which can provide support and the settlement can be predicted quite accurate. Also the Tower itself is supported on a huge concrete slab which is supported by almost 1000 concrete piles of 55m+ in length(they start of course from basement level) resting on the sand layer. If the tower settles over time, I think it's not likely that it will tilt but will settle equally since the concrete slab and connected piles form a rigid mass. But maybe someone else can give some insight about that?

To clarify I added an example of a common diagram used by engineers. It shows the changes of resistance different layers of soil have over a certain depth. It shows for instance that there are 3 layers(blue) which provide more friction than others. Based on the load the engineers can calculate which ones can be used for a (pile)foundation. And yes the text is in Dutch

image hosted on flickr
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Old May 14th, 2012, 08:25 PM   #10815
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Whoa! What a progress lately! Congrats Shanghai, keep goin!
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Old May 15th, 2012, 12:15 AM   #10816
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Quote:
Originally Posted by Nordschleife View Post

Actually the mud they have removed for the foundation weighs more than the tower itself.
Is this really true? Sounds interesting.
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Old May 15th, 2012, 12:50 AM   #10817
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Old May 15th, 2012, 11:13 AM   #10818
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looks like a spine. construction skeletton at its finest
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Old May 15th, 2012, 11:21 AM   #10819
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RISE RISE RISE!

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Shanghai Tower Construction Site in a foggy night by ScaarAT, on Flickr
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Old May 15th, 2012, 12:22 PM   #10820
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Nice!!!
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