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Megatalls Discussions of projects under construction at least 600m/2,000 ft tall.



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Old September 19th, 2014, 02:31 AM   #8721
Ivan the Immigrant
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Quote:
Originally Posted by K.S.A View Post
Burj khalifa :

piling : 192 piling

deepest piles : 50 m

Kingdom tower :

piling : 270 piling

deepest piles : 105 m


So, Burj Khalifa has piles instead of foundations as well....What about other supertalls or even highrises in Dubai and Saudi Arabia. Do they all have piles....?
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Old September 19th, 2014, 02:40 AM   #8722
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Quote:
Originally Posted by Ivan the Immigrant View Post
So, Burj Khalifa has piles instead of foundations as well....What about other supertalls or even highrises in Dubai and Saudi Arabia. Do they all have piles....?
They are literally building on sand. What do you think? Even lowrise buildings like Dubai Mall have piles. Also it's not "instead of a foundation". Piles are, like the raft / base mat, part of a foundation.
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Old September 19th, 2014, 02:41 AM   #8723
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Quote:
Originally Posted by Ivan the Immigrant View Post
So, Burj Khalifa has piles instead of foundations as well....What about other supertalls or even highrises in Dubai and Saudi Arabia. Do they all have piles....?
Piles are best foundations for sand soil. It's the same concept as a beach umbrella: at the beginning you can nail the umbrella easily, but when you go deeper the stick it's harder to nail because of side friction, until a point you can't go any deeper.
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Old September 19th, 2014, 02:49 AM   #8724
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Quote:
Originally Posted by Dubai Skyscraper View Post
They are literally building on sand. What do you think? Even lowrise buildings like Dubai Mall have piles. Also it's not "instead of a foundation". Piles are, like the raft / base mat, part of a foundation.
Yes, i knew they are building on sand. But i didn't know how deep that sand is going. I thought sand cannot be so deep. I thought sand is maybe 20-30 metres deep and after the sand there is a solid rock. But it seems there is not rock... How deep is send in Dubai and Jeddah?
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Old September 19th, 2014, 02:50 AM   #8725
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I mean, why didn't they excavated sand until they reached solid rock, and then start building foundations on solid rock?
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Old September 19th, 2014, 03:30 AM   #8726
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Ivan - For future reference, please simply edit your previous posts rather than double posting to add on to your previous one. Thanks!
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Old September 19th, 2014, 03:34 AM   #8727
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Quote:
Originally Posted by Pablobegood View Post
Piles are best foundations for sand soil. It's the same concept as a beach umbrella: at the beginning you can nail the umbrella easily, but when you go deeper the stick it's harder to nail because of side friction, until a point you can't go any deeper.
London and Brussels have them too. They're also great for swampy soil.
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Old September 19th, 2014, 04:12 AM   #8728
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Ivan, it's common in NYC and other areas to go directly to bedrock (stone), because it's relatively shallow. For Dubai, Jeddah, and many other areas of the world, having solid rock is not an option. The graphs I've seen show limestone and other somewhat solid material far below 400 meters / 1,300 feet down. In the Middle East, it's mostly sand and other varieties of loose stone so it's not suitable to dig that far for a foundation.

In other words, most of the newer buildings being built have to rely upon soil friction + piles + a mat to all add together to form the foundation, not just building steel on rock strong enough.

I'd imagine nearly any tall building still has a concrete base / mat, even if it's not as thick as this. But again, a smaller mat may rest on stronger ground and need less pile or caisson work to fully compile a foundation. Here, they don't have that so different techniques have to be used.
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Old September 19th, 2014, 02:27 PM   #8729
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Has this been posted?
Jeddah Kingdom Tower - 12th September 2014:
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Last edited by VacaLoca; September 19th, 2014 at 02:35 PM.
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Old September 19th, 2014, 04:01 PM   #8730
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Yes, it was
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Old September 19th, 2014, 04:27 PM   #8731
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The world's tallest trees, the California Redwoods, can grow over 100 meters tall, yet have root systems that only go down into the ground a few meters. It's about STRENGTH, not SIZE.


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Old September 19th, 2014, 10:07 PM   #8732
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Why do the branches have to be all the way up there? Lol
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Old September 19th, 2014, 11:48 PM   #8733
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18/09/2014
















Full Size




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Old September 20th, 2014, 01:51 AM   #8734
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impressive update ...

good progress ...
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Old September 20th, 2014, 01:54 AM   #8735
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great!!!come on KT!
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Old September 20th, 2014, 04:24 AM   #8736
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Powerful building!










http://architizer.com/blog/kingdom-tower-10-facts/
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Old September 20th, 2014, 04:25 AM   #8737
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edit.
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Old September 20th, 2014, 04:41 AM   #8738
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Quote:
Originally Posted by SkYsCrApEr2013 View Post
Why do the branches have to be all the way up there? Lol
Because the leaves need to catch sunlight. If they were at the base of the tree it's size would block the tree's sunlight, which would result that the tree would die. If they would have been smaller the sunlight would have been blocked by the surrounding trees.
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Old September 20th, 2014, 06:00 AM   #8739
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Quote:
Originally Posted by S.T.Y AP View Post

Really nice lobby!

Also, I can't wait to see that curved glass canopy. Seems to be an often overlooked detail.
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Old September 20th, 2014, 09:51 AM   #8740
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The height in the thread topic is still 1007m ? why ?

it is 1000M+
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