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Old December 9th, 2015, 04:43 PM   #13321
archur96
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Using 6376.74284 km as the radius of the earth (calculated with this formula: R=sqrt(((Rmax^2*cos(phi))^2+(Rmin^2*sin(phi))^2)/((Rmax*cos(phi))^2+(Rmin*sin(phi))^2)) phi is the latitude, 27.734257º) and an estimated height of 1 km.

The maximum visibility would be about 113 km in perfect conditions.
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Old December 9th, 2015, 05:21 PM   #13322
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Old December 9th, 2015, 05:22 PM   #13323
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Old December 9th, 2015, 06:15 PM   #13324
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Quote:
Originally Posted by Bradipo View Post
To solve the question whether the tower can be seen from Egypt you should use the formula described in the section "objects above horizon" at this link: https://en.m.wikipedia.org/wiki/Horizon I'm too lazy to do it.



I guess it's that time of the year already where we discuss if you will be able to see the tower from this tower, or that landmark over there, or maybe even the Hoover Dam.
This thread literally seasons like the weather
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Old December 9th, 2015, 06:19 PM   #13325
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Quote:
Originally Posted by archur96 View Post
Using 6376.74284 km as the radius of the earth (calculated with this formula: R=sqrt(((Rmax^2*cos(phi))^2+(Rmin^2*sin(phi))^2)/((Rmax*cos(phi))^2+(Rmin*sin(phi))^2)) phi is the latitude, 27.734257º) and an estimated height of 1 km.

The maximum visibility would be about 113 km in perfect conditions.


Actually 113 km is if you are upstairs in the ground.
The previous photograph from Barcelona has been taken uphill Tibidabo. That is 450 metres hight.
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Old December 9th, 2015, 06:40 PM   #13326
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Actually 113 km is if you are upstairs in the ground.
The previous photograph from Barcelona has been taken uphill Tibidabo. That is 450 metres hight.
Yeah, I know. I'm talking about Jeddah tower. There are not mountains around it so I have assumed that the ground is as high as the sea. If there are mountains round the tower you will have more visibility area.

Also Mallorca's mountains are higher than Jeddah Tower. They are 1.4 km high.
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Old December 10th, 2015, 12:07 AM   #13327
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Too easy.
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Old December 10th, 2015, 12:08 AM   #13328
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Ok, at 3 storeys per month, at this time next year it should be around 63 storeys high.

(3 X 12 = 36)
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Old December 10th, 2015, 05:37 AM   #13329
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Ok, at 3 storeys per month, at this time next year it should be around 63 storeys high.

(3 X 12 = 36)
The pace should accelerate as well. The work crews are getting more experienced and the floor area is decreasing with height.

Can anyone comment how this compares to the construction pace of other towers?
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Old December 10th, 2015, 06:45 AM   #13330
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Originally Posted by Dave-in-Toronto View Post
Ok, at 3 storeys per month, at this time next year it should be around 63 storeys high.

(3 X 12 = 36)
I just noticed in Hamcl's time lapse shot above, where part of the right wing rises...


You can also see the free-standing tower crane also jump, after it lifts up its support segment.
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Old December 10th, 2015, 06:55 AM   #13331
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[QUOTE=Gudavalli;129112306]December 3 by Shamim Baig


Where do they measure the building height from in this picture. At the ground where the bottom floor is here. And is that below sea level slightly.
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Old December 10th, 2015, 08:22 AM   #13332
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gayat

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projek yang menakjubkan
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Old December 10th, 2015, 10:17 AM   #13333
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core is rising right now
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Old December 10th, 2015, 10:59 AM   #13334
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Old December 10th, 2015, 11:34 AM   #13335
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Quote:
Originally Posted by dfiler View Post
The pace should accelerate as well. The work crews are getting more experienced and the floor area is decreasing with height.

Can anyone comment how this compares to the construction pace of other towers?
I agree with you. Modified schedule will be beneficial to all projects.
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Old December 10th, 2015, 12:01 PM   #13336
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Quote:
Originally Posted by dfiler View Post
The pace should accelerate as well. The work crews are getting more experienced and the floor area is decreasing with height.
One really limiting factor is the curing time of concrete, which can't be (safely) accelerated. They're pouring it on the spot, which means they have to wait for a while for the concrete to cure before they can put more weight above it.
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Old December 10th, 2015, 12:16 PM   #13337
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Quote:
Originally Posted by dfiler View Post
... and the floor area is decreasing with height.
This is only a very small decrease for each next floor, compared tot the total floor area.

The increase in height (hoisting times, etc.) compensates this, and will become the dominant factor above a certain height.


As far as I can remember, the pace at DB was 2 floors/week at a certain moment.
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Old December 10th, 2015, 02:11 PM   #13338
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So the tower now is : 29 floors right ?
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Last edited by Hamcl; December 10th, 2015 at 02:29 PM.
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Old December 10th, 2015, 08:18 PM   #13339
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Probably.
Looks like the end of the left wing is gonna rise soon. Might be wrong though.
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Old December 10th, 2015, 09:34 PM   #13340
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Quote:
Originally Posted by Arzonz View Post
Probably.
Looks like the end of the left wing is gonna rise soon. Might be wrong though.
Agree. It's on the left side of the structure must be made more quickly
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