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Old October 12th, 2009, 10:58 PM   #3121
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Wow!
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Old October 12th, 2009, 11:43 PM   #3122
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sorry for the wrong statement ,glad to see the fast progress.
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Old October 13th, 2009, 04:13 AM   #3123
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it will complete on 2012...??
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Old October 13th, 2009, 04:18 AM   #3124
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A building this big, in just a little over 2 years? I highly doubt it.
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Old October 13th, 2009, 07:42 AM   #3125
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It will be finished in 2014.
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Old October 13th, 2009, 11:43 PM   #3126
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please explain piling compare to Dubai's BD -

Question for Fury, or anyone who knows - the differences in number of piles between Shanghai Tower and Burj Dubai - BD has about 192, and ST has nearly a thousand -
please explain the reasons for this large difference - considering that the two buildings are similar in size ( I may be wrong ).

Also, ST foundation goes much deeper - probably differences in the ground

A side-by-side comparison would be enlightening - if possible.

Thank you.
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Old October 14th, 2009, 12:07 AM   #3127
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I think it is because the ST is practically built on mud, which can support a lot less weight than sand, which the BD is built on.

putting more piles in, and deeper ones means there is more surface area contact with the ground, so more weight can be built on top compared to less and smaller poles.

I think this is why.
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Old October 14th, 2009, 05:52 AM   #3128
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Hi all.

I think Matt has it right.

I think I remember hearing Shanghai does have fairly unstable geology.
The Burj Dubai sits on 194 (yes - the 192 number is everywhere but I have pile layouts that show 194) 1.5 by ~50 meter - skin friction piles. The bedrock is too deep for piles of reasonable length to sit on.

The Shanghai Tower sits on 955 - 1 by ~86 meter piles. I still find it hard to grasp the 955 number - it seems unreal. The large number may be needed because of the unstable geology and the depth may be because there is bedrock down at that depth but I'm thinking they are not resting on bedrock because of the large number.

Too bad someone didn't get us a shot of the pile layout drawing - and a few hundred more drawings and prints to boot ...

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Old October 14th, 2009, 06:02 AM   #3129
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Wow....955 piles? Is that a record of some sort? That's a lot of holes!!!
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Old October 14th, 2009, 02:01 PM   #3130
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Here are some pics I took today! Oct 14.

Ground level you can see the cliff made by the hole.



Here is the shot from Jin Mao's 56th floor. Things sure have changed since I was last there!

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Old October 14th, 2009, 02:16 PM   #3131
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Thanks for the great pics! Already some piles visible
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Old October 14th, 2009, 02:23 PM   #3132
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Cool! You can see the piles already! Amazing speed here.
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Old October 14th, 2009, 02:42 PM   #3133
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Quote:
Originally Posted by Library User View Post
Question for Fury, or anyone who knows - the differences in number of piles between Shanghai Tower and Burj Dubai - BD has about 192, and ST has nearly a thousand -
please explain the reasons for this large difference - considering that the two buildings are similar in size ( I may be wrong ).

Also, ST foundation goes much deeper - probably differences in the ground

A side-by-side comparison would be enlightening - if possible.

Thank you.
Quote:
Originally Posted by MattTheTubaGuy View Post
I think it is because the ST is practically built on mud, which can support a lot less weight than sand, which the BD is built on.

putting more piles in, and deeper ones means there is more surface area contact with the ground, so more weight can be built on top compared to less and smaller poles.

I think this is why.
Quote:
Originally Posted by Fury View Post
Hi all.

I think Matt has it right.

I think I remember hearing Shanghai does have fairly unstable geology.
The Burj Dubai sits on 194 (yes - the 192 number is everywhere but I have pile layouts that show 194) 1.5 by ~50 meter - skin friction piles. The bedrock is too deep for piles of reasonable length to sit on.

The Shanghai Tower sits on 955 - 1 by ~86 meter piles. I still find it hard to grasp the 955 number - it seems unreal. The large number may be needed because of the unstable geology and the depth may be because there is bedrock down at that depth but I'm thinking they are not resting on bedrock because of the large number.

Too bad someone didn't get us a shot of the pile layout drawing - and a few hundred more drawings and prints to boot ...

Except the obvious soil differences, the shape of the designs have allot to do with it. Shanghai tower's shape isn't exactly wind resistance friendly as Burj Dubai is.

This is the same argument as for the 516 m tall Pentominium tower (in Dubai) that has 250 piles going 60 - 80 meters deep (more and deeper then Burj Dubai)
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Old October 14th, 2009, 08:36 PM   #3134
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Quote:
Originally Posted by Severiano View Post
This photo shows that they are making a secundary slurrywall around the outside edge of the plot. So maybe the core/tower has a bigger or deeper raft than the surrounding podium. Think about how deep the 'inner' hole will be....
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Old October 15th, 2009, 02:22 AM   #3135
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Hi all.

Hi Altin - good thought on the wind for the pile discussion.

Hi Severiano.

Great update. The digging is moving along - looks to be well over 10 meters deep in some places.



I had a look through my pics of this project and if the piles are evenly distributed through the hole (and it looks like they are by the shots that show some piles) the 955 number looks correct.

This will be a good one to watch ...

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Old October 15th, 2009, 04:03 AM   #3136
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i can see the whole area...nice up date...
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Old October 15th, 2009, 11:08 AM   #3137
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Thanks for the updates guys. It so great to have another megatall just beginning contruction as Burj Dubai is reaching final completion. And in many ways I think Shanghai Tower is even more exciting then BD because it doesn't involve a long taper at the top, plus it is such a incredible design, and it already has two of the tallest buildings on Earth sitting beside it. Fingers crossed it keeps powering ahead.
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Old October 15th, 2009, 12:22 PM   #3138
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I'm surprised those piles are exposed so early. I was expecting a much deeper hole, however these exposed piles might be the ones that were load tested and the caps of the other piles will be at the right depth.
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Old October 15th, 2009, 12:56 PM   #3139
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An engineer of the tower did mention something about the testing piles, to test the pressures and many other datas. I am not sure if those are the ones he was talking about though. I dont know much about foundations and engineering =/

So here is a question, how on earth are they going to continue digging with all these piles sticking around?
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Old October 15th, 2009, 12:58 PM   #3140
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This is what i mean, the piles are so closely packed together, there is no room to even fit the diggers.

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