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



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Old January 25th, 2015, 08:05 PM   #10121
towerpower123
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The core is in the middle. The sloping part is the bracing walls at the end of each of the three wings for stabilization. The floor plates are wider, but the concrete portion is the maximum horizontal extent.



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Old January 25th, 2015, 08:12 PM   #10122
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Quote:
Originally Posted by Woonsocket54 View Post
will Earth's tallest tower be visible from Earth's poorest continent?
No. Not even with the aid of the Earth's most powerful optics, and bestestest sensor
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Old January 25th, 2015, 11:35 PM   #10123
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Quote:
Originally Posted by CopyLeft View Post
No. Not even with the aid of the Earth's most powerful optics, and bestestest sensor
Lol
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Old January 26th, 2015, 12:40 AM   #10124
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But if the poorest continent would build an equal tower directly opposite KT they would be able to see each others top.
To be exact: assuming a distance of 200km and a height of 1007m, you can, from the top of one tower, see the top 423m part of the other.
Or, the poorest continent being really poor, it could build just 584m high tower and they could obeserve each others top nanometer.
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Old January 26th, 2015, 02:45 AM   #10125
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Quote:
Originally Posted by towerpower123 View Post
The core is in the middle. The sloping part is the bracing walls at the end of each of the three wings for stabilization. The floor plates are wider, but the concrete portion is the maximum horizontal extent.



http://www.ctbuh.org/TallBuildings/F...B/Default.aspx
Thank you towerpower123 for posting something useful on this topic, rather than everybody else's rude responses to a legitimate question.
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Old January 26th, 2015, 07:00 AM   #10126
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Quote:
Originally Posted by fayzoon View Post
And they didn't use a webcam, yet !!

I think the reason is that they want people to keep searching about this tower's construction news

Did burj khalifa use a web cam on site ?
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Old January 26th, 2015, 07:14 AM   #10127
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Quote:
Originally Posted by alsaif2012 View Post
The two red cranes on the right became shorter how com ?
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Old January 26th, 2015, 07:55 AM   #10128
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Quote:
Originally Posted by abukhaled View Post
Did burj khalifa use a web cam on site ?
No
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Old January 26th, 2015, 08:26 AM   #10129
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Quote:
Originally Posted by Woonsocket54 View Post
will Earth's tallest tower be visible from Earth's poorest continent?
Nice question ahah, but even if isn't needed, it also has an exact answer.

If we take into account that African nearer point is 200km far way, and taking the Earth circunpherence slice from the center as more or less 40.000km of perimetre and 6370 of radius (rounded numbers), we can tell the next:

Distance between Jeddah and Afrika is arround 1,8 talking in angular degrees.

Making a triangle rectangle with our local earth radius and this angle, we does:

6370km x tan1,8 = 200,21km

This means that the top of a tower that is slightly "visible" from 200km angular distance is at 200,2km linear distance. Okay, lets calculate HIP:

HIP = V(200,2^2+6370^2) = 6373,1km

Sooo, the top of our tower is 6373,1 km fram from earths centers... and that means 3,1km far from surface.


So, conclusion: Even the best optical sensor, will only be able to watch a tower in Jeddah from Afrika's nearer point, if this tower is at least 3,1km high. ahahahahaha
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Old January 26th, 2015, 09:41 AM   #10130
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Quote:
Originally Posted by abukhaled View Post
Did burj khalifa use a web cam on site ?
No.
But there was a separate website about it (not an official one), with almost daily photo updates in high quality.
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Old January 26th, 2015, 09:44 AM   #10131
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Quote:
Originally Posted by abukhaled View Post
The two red cranes on the right became shorter how com ?
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.

Last edited by oud-Rotterdammer; January 26th, 2015 at 11:49 AM.
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Old January 26th, 2015, 10:48 AM   #10132
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We have a lot of good updates for this project, so much more than many other projects.
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Old January 26th, 2015, 10:50 AM   #10133
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It has quite OK'ish structural design, I must admit! "Quite OK'ish" is (on average) a very high and rare rating of my own.
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Last edited by CopyLeft; January 26th, 2015 at 10:57 AM.
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Old January 26th, 2015, 02:36 PM   #10134
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Quote:
Originally Posted by oud-Rotterdammer View Post
No.
But there was a separate website about it (not an official one), with almost daily photo updates in high quality.
That website was run by a SSC member (Bike), and most pictures were posted first here by the respective photographers (me included)
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Old January 26th, 2015, 04:26 PM   #10135
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It still exists!

http://www.burjdubaiskyscraper.com


(On the forum, I hold the 3rd position in the amount of posts.)
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Old January 26th, 2015, 10:04 PM   #10136
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Old January 26th, 2015, 10:24 PM   #10137
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Quote:
Originally Posted by rosonator View Post
Nice question ahah, but even if isn't needed, it also has an exact answer.

If we take into account that African nearer point is 200km far way, and taking the Earth circunpherence slice from the center as more or less 40.000km of perimetre and 6370 of radius (rounded numbers), we can tell the next:

Distance between Jeddah and Afrika is arround 1,8 talking in angular degrees.

Making a triangle rectangle with our local earth radius and this angle, we does:

6370km x tan1,8 = 200,21km

This means that the top of a tower that is slightly "visible" from 200km angular distance is at 200,2km linear distance. Okay, lets calculate HIP:

HIP = V(200,2^2+6370^2) = 6373,1km

Sooo, the top of our tower is 6373,1 km fram from earths centers... and that means 3,1km far from surface.


So, conclusion: Even the best optical sensor, will only be able to watch a tower in Jeddah from Afrika's nearer point, if this tower is at least 3,1km high. ahahahahaha
Sou can do this much easier

a+b=c

6370km+b=(6370km+1km)
=
6371km-6370km=c
12741=c
√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
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Old January 26th, 2015, 10:31 PM   #10138
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nice
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Old January 26th, 2015, 10:56 PM   #10139
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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) - r = c
=> r + 2rh + h - r = c
=> 2rh + h = c
=> h(2r+h) = c
Because r >> h this is very well approximated by
2rh = c
=> 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 πc = 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
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Old January 27th, 2015, 01:13 AM   #10140
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nice ..i understand nothing ..thank you guys for reminding me of how stupid im >_<
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