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Old March 15th, 2015, 01:28 AM   #10681
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Originally Posted by Bohdan Astro View Post
It is interesting, how they decided that on the top of this 1007m building should be Liebherr (not Wolff) crane?
They choose the best in relation to the costs.
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Old March 15th, 2015, 01:35 AM   #10682
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i'm outing myself now as someone who knows nothing about cranes. so could someone explain what the difference about them are. is it just quality and cost or does each company have their own pros and cons or are usually used for different stages of construction?
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Old March 15th, 2015, 03:51 AM   #10683
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That photo reminds me the Burj Khalifa at its early construction stages... What a nice shot from far!
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Old March 15th, 2015, 04:20 AM   #10684
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Quote:
Originally Posted by ThatOneGuy View Post
Yeah, totally...
[img]http://i57.************/2n1eybt.jpg[/img]
Can anyone clarify the notes on the left side of this drawing? It says 43,300 mPa concrete @ 90 days. If I'm reading that correctly that would be the required breaks on the test cylinders of concrete and I've never seen mud higher than ~20,000 psi in the U.S. This would mean they are using 6,000,000 psi mud?!?! I must be reading that wrong.
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Old March 15th, 2015, 06:28 AM   #10685
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Quote:
Originally Posted by Arch_Angel 753 View Post
Can anyone clarify the notes on the left side of this drawing? It says 43,300 mPa concrete @ 90 days. If I'm reading that correctly that would be the required breaks on the test cylinders of concrete and I've never seen mud higher than ~20,000 psi in the U.S. This would mean they are using 6,000,000 psi mud?!?! I must be reading that wrong.
Yeah it was confusing too, even when I had asked my professors back in college about MPa when I had first learned about it in the Petronas Towers' construction, because the professors were simply used to PSI. But back when I was asking myself the same thing about MPa on this thread, I did find this site:
http://www.ribmc2.com/estref/popular..._strengths.htm

It shows that 6,000 PSI is roughly 41 MPa so close enough.

Thus at the base, 85 MPa so probably a ~14,000 PSI mix. I believe this type of concrete is the same that's in the WTC / 432 PA etc. Super strong, dense high grade concrete. Only makes sense.
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Old March 15th, 2015, 09:31 AM   #10686
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Is the "sky raft" the last inhabitable floor?
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Old March 15th, 2015, 11:20 AM   #10687
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Quote:
Originally Posted by IngMarco View Post
Is the "sky raft" the last inhabitable floor?
Yes the 'sky raft' indicates the highest floor which the public can visit, which is a viewing deck I think. However it is not the last inhabitable floor since there are many others above that will be for maintenance and telecommunications at the top.
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Old March 15th, 2015, 02:32 PM   #10688
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fake the building only goes up to 670, the rest is just dead concrete. Burj is more impressive
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Old March 15th, 2015, 02:38 PM   #10689
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Dead concrete all the way from Level 167 up to Level 240!!!
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Old March 15th, 2015, 02:55 PM   #10690
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Quote:
Originally Posted by Supertall Robbo View Post
fake the building only goes up to 670, the rest is just dead concrete. Burj is more impressive
Building is fake because it has dead concrete? I bet the Burj has dead concrete too.
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Old March 15th, 2015, 02:56 PM   #10691
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Originally Posted by Ch.W View Post
They choose the best in relation to the costs.
I hope so...
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Old March 15th, 2015, 08:48 PM   #10692
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Quote:
Originally Posted by Supertall Robbo View Post
fake the building only goes up to 670, the rest is just dead concrete. Burj is more impressive
The Burj has 200m+ "Dead Steel". And now?
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Old March 15th, 2015, 11:06 PM   #10693
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The Burj has 200m+ "Dead Steel". And now?
Children, can we all get along?
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Old March 16th, 2015, 02:13 AM   #10694
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Quote:
Originally Posted by Xvioxify View Post
Yes the 'sky raft' indicates the highest floor which the public can visit, which is a viewing deck I think. However it is not the last inhabitable floor since there are many others above that will be for maintenance and telecommunications at the top.
Actually from what I remember, didn't the owner request a few more floors to be put in the tower? So what we see on that diagram might be outdated a bit. I could be wrong.
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Old March 16th, 2015, 02:30 AM   #10695
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any suggestions about car parking?
there are no underground floors right?
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Old March 16th, 2015, 02:36 AM   #10696
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Quote:
Originally Posted by The-Real-Link View Post
Yeah it was confusing too, even when I had asked my professors back in college about MPa when I had first learned about it in the Petronas Towers' construction, because the professors were simply used to PSI. But back when I was asking myself the same thing about MPa on this thread, I did find this site:
http://www.ribmc2.com/estref/popular..._strengths.htm

It shows that 6,000 PSI is roughly 41 MPa so close enough.

Thus at the base, 85 MPa so probably a ~14,000 PSI mix. I believe this type of concrete is the same that's in the WTC / 432 PA etc. Super strong, dense high grade concrete. Only makes sense.
To be precise 85 MPa is 12 328 psi. That is some very strong concrete, although not the strongest in the world. The currently strongest concrete in the world is in 432 Park Avenue and the new World Trade Center, both in New York City, which has 14 000 psi. The title will however soon be overtaken by the 433 meter Steinway Tower, which is in New York too. It will use 16 000 psi concrete
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Old March 16th, 2015, 02:47 AM   #10697
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Originally Posted by KillerZavatar View Post
i'm outing myself now as someone who knows nothing about cranes. so could someone explain what the difference about them are. is it just quality and cost or does each company have their own pros and cons or are usually used for different stages of construction?
Difficult but interesting questions.
To put it in a few sentences:

- of course is every typ of crane an unique instrument and specialiced for certain tasks
For example tower cranes used on every skyscraper, which one is needed depends on:
- the expected weight every crane has to carry
- the expected height to climb up
- the sizes of them, especially the lengh of the cantilever in relation to the maximum weight to carry
- how easy and unproblematic is it to build it up and break it down
- the radius that a crane can reach without replacing it. So for the lower construction stages mobile cranes are often used additional.
- for sure the costs for renting and furthermore the working costs

Pro and cons for different companys delivering similar cranes:
- the available of spare parts when something gets damaged, is there a storage in the used country or does every part needs expensive and long time shipping?
- the experiences and references of the company
- quality and reliability
- what others products additional needed offers the company? It's easier (should be) to deal with one company delivering more than cranes
And at last at every economic decision the "climate" beetween client and deliverer, fixed and known contacts.

For an example of knowledge and international references the Liebherr company which cranes also build the Kingdom Tower (for calming i don't stand on their payrole)
- 1949 Liebherr was the first company constructed an easy build up and break down transportable tower crane
- from then on they invented a lot of new technics to lower the working costs at the same time increase the performance
- international availibility of their products and solutions from a single source
- Liebherr and the bin ladin group had worked before on some great projects and "know each other". So this fact was one desisive point why Liebherr won the race and no other company.
- and so on...see what cranes is needed isn't easy to say.

(i hope you can follow me. I'm a long time out of school and usually don't need english in my daily life, so i'm still learning every day more... sorry for typo and perhaps weird grammar)
Further very detailed information about types of crane and their fields of application on the well known website:
en.m.wikipedia.org/wiki/Crane_(machine)
de.m.wikipedia.org/wiki/Turmdrehkran
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Last edited by Ch.W; March 17th, 2015 at 03:02 AM. Reason: typo and adding
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Old March 16th, 2015, 08:00 AM   #10698
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Quote:
Originally Posted by Xvioxify View Post
Yes the 'sky raft' indicates the highest floor which the public can visit, which is a viewing deck I think. However it is not the last inhabitable floor since there are many others above that will be for maintenance and telecommunications at the top.
that sky raft thing is not for the public to visit IIRC
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Old March 16th, 2015, 11:33 AM   #10699
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nice picture
Yepp very nice...btw your nickname is hilarious
You're welcome!
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Old March 16th, 2015, 11:35 AM   #10700
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that sky raft thing is not for the public to visit IIRC
I think he meant the viewing deck for last visible public floor
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