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



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Old January 27th, 2015, 02:05 AM   #10141
jogiba
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Quote:
Originally Posted by abukhaled View Post
Did burj khalifa use a web cam on site ?
No, but here are some shots from 2005 to 2006 :
http://www.burjdubaiskyscraper.com/2...ressreport.jpg
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Old January 27th, 2015, 02:47 AM   #10142
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Quote:
Originally Posted by jogiba View Post
No, but here are some shots from 2005 to 2006 :
http://www.burjdubaiskyscraper.com/2...ressreport.jpg
But the tower is not delay as the Burj
Isn't it?
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Old January 27th, 2015, 08:34 AM   #10143
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Quote:
Originally Posted by DubaiM View Post
Sou can do this much easier

a²+b²=c²

6370km²+b²=(6370km+1km)²
=
6371km²-6370km²=c²
12741=c²
√12741=c
112,8km=c

So you can see the the tip of the Kingdom Tower in a distance of max. 112,8km.

It's called Pythagoras and it isn't so complicated at all
Right.
I already said this on a previous page, 113km - tip, ~5km - bottom.
I don't know what you are calculating here, but there is muuuuch more simpler formula...
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Old January 27th, 2015, 08:47 AM   #10144
oud-Rotterdammer
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Quote:
Originally Posted by ColBogota View Post
But the tower is not delay as the Burj
Isn't it?
Seemingly, there is no delay on KT.

I remember that BD had a setback when the window installation should start.
The window company had gone bankrupt, and another supplier had to be selected in a short time. Including a test wall, etc.
But that all succeeded, and window installation was sped up, and reday in time.
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Old January 27th, 2015, 01:37 PM   #10145
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27/01/2015



















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Old January 27th, 2015, 02:38 PM   #10146
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Quote:
Originally Posted by egramsb View Post
You are substracting two almost-equal numbers in this method. It is not wrong but with a bit of algebra you get a more intuitive result:
(r+h)² - r² = c²
=> r² + 2rh + h² - r² = c²
=> 2rh + h² = c²
=> h(2r+h) = c²
Because r >> h this is very well approximated by
2rh = c²
=> c = √(2rh)
So the distance is only proportional to the sqare root of the height.
This might be a bit disappointing, but the visible area within the horizon is πc² = 2πch which is proportional to the height. In fact, the visual area is the product of the height and the earth's circumference. Or more poetically: the area of a ribbon around the equator with a width equal to the height of the building. This can also be proved in a more direct geometrical (less algebraic) way, which I leave to all of you as an exercise
Yes that's an easy possibility too. It's exactly the same result (not more intuitive), just an other way to get there.
Ok lets say, there are multiple ways to calculate it.
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Last edited by DubaiM; January 27th, 2015 at 02:55 PM.
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Old January 27th, 2015, 02:39 PM   #10147
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The core right now is really high! It's maybe more than 65m
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Old January 27th, 2015, 03:13 PM   #10148
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LOL at you guys discussing the distance from where you can watch the tip of the spire .... as if everything is on vacuum
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Old January 27th, 2015, 03:43 PM   #10149
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20/11/2014



27/1/2015



awesome progress
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Old January 27th, 2015, 06:16 PM   #10150
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Old January 27th, 2015, 06:38 PM   #10151
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Quote:
Originally Posted by R_g View Post
i wonder why they built the red cranes high and then lowered them.
anyone know why?
See my posting #10190 on the previous page.
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Old January 27th, 2015, 07:41 PM   #10152
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Quote:
Originally Posted by oud-Rotterdammer View Post
These are not the final high-rise tower cranes, at least not on these positions (inside the core).
One of the final cranes will go all to the top and build the spire. This means that it must be outside the core.

(NB This is different from Burj Khalifa, which has the roofs of the tiers on which cranes could be installed. Once the Burj became +/- 600 m, one crane of 3 went to a tier at +/- 300 m The 2 other cranes went further up, but only one all to the top.)


Final cranes at KT are now being built up. But not as close to each other as now. They must also serve the construction of the 3 wings.

It is to say that rather than the it Tower will rise the crane in the end
truth?
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Old January 27th, 2015, 07:50 PM   #10153
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http://www.liebherr.com/en/deu/lates...di-arabia.html

Just wait and see how they erect and dismantle the cranes.
It will be spectacular.
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Old January 27th, 2015, 09:57 PM   #10154
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Quote:
Originally Posted by R_g View Post
on vacuum?
Yes on vacuum.
The air itself make things in the distance appear more bluish.
Blue perspective...and particles, dust and sand, especially in the desert does the rest.
So this calculation works only in space without anything=vacuum.
Just take a looks at the "clean" chinese cities...smog everywhere.
But i don't know how you can re-calculate it in a more realistic way?
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Old January 27th, 2015, 10:06 PM   #10155
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*In* a vacuum.
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Old January 27th, 2015, 10:36 PM   #10156
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Quote:
Originally Posted by londonfai View Post
*In* a vacuum.
o.k. in a vacuum...i train my english:-)
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Old January 28th, 2015, 12:17 AM   #10157
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Lift me higher: Building the world's tallest lift
http://www.bbc.com/news/technology-30930513
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Old January 28th, 2015, 12:38 AM   #10158
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Quote:
Originally Posted by hamadx View Post
Lift me higher: Building the world's tallest lift
http://www.bbc.com/news/technology-30930513
It's a pretty decent article about KT.

¿"Magnetic levitation lifts"?

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Old January 28th, 2015, 02:56 AM   #10159
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I wonder, with a telescope, would you be able to see Burj Khalifa in the distance from the top floor??
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Old January 28th, 2015, 03:32 AM   #10160
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Quote:
Originally Posted by Shaddorry View Post
I wonder, with a telescope, would you be able to see Burj Khalifa in the distance from the top floor??
No. You could have the most powerful telescope in the universe and it wouldn't matter because the curvature of the Earth makes it impossible to see from that distance, which is about 2,000 km.
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