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Old April 23rd, 2008, 03:23 AM   #6301
storms991
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Quote:
Originally Posted by CULWULLA View Post
^days before the OH&S rules and regulations. no wonder many died building ESB.
Only 5 workers died constructing the Empire State Building according to Wikipedia.
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Old April 23rd, 2008, 04:28 AM   #6302
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Quote:
Originally Posted by glassNsteel View Post
OMG!!!.....now please guys, stop complaining that the steel is taking too long to put up!
Seriously I would be taking my sweet time to bolt the structure together if I were up there. I wouldn't want to risk my life or serious injury because I was rushing. Plus the wind up there must be very unfriendly.
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Old April 23rd, 2008, 04:40 AM   #6303
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Hi all.

Here is the 2 pics from the crane.

08 04 03



08 04 06




IMO reasonable progress for 3 days.

Let me repeat from a prev. post - I hope this photog will continue to take pics from here. Nice perspective.

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Old April 23rd, 2008, 05:22 AM   #6304
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Quote:
Originally Posted by Fury View Post
Hi all.

Hey Cul the steel they are working on is at 630.5 m. - the top of level 160 mezz. 3.

Hey Ember - nice idea to show the tiers but your numbers are not exactly correct. The crane the shot is taken from is the same perspective as all the blueprints - approx. 120 degrees. The tier tops are also the terrace for the next level.

Here is an part of my tier methodology to help show which direction the terraces face.



I will use a 360 degree directional compass for the approximate direction the points of the wings face.

Tier 30 Top is a platform 1.5 M diameter with a hatch.
Tier 30 - pinnacle 4 is circular 1.2 M diameter.
Tier 29 - pinnacle 3 is circular 1.35 M diameter.
Tier 28 - pinnacle 2 is circular 1.5 M diameter.
Tier 27 - pinnacle 1 begins with tier 26 terrace facing 180, then rises up circular 2.1 M diameter.

Tier 24, 25, and 26 wings are 1.5 M long.
Tier 26 - spire 5 begins with tier 25 terrace facing 60 then rises up with 1 wing facing 180.
Tier 25 - spire 4 begins with tier 24 terrace facing 300 then rises up with 2 wings facing 60 and 180.
Tier 24 - spire 3 begins with tier 23 terrace facing 240 then rises up symmetrically with 3 wings facing 60, 180, and 300.

Tier 21, 22, and 23 wings are 6 M long.
Tier 23 - spire 2 begins with tier 22 terrace facing 120 then rises up with 1 wing facing 240.
Tier 22 - spire 1/roof 4 begins with tier 21 terrace facing 0 then rises up with 2 wings facing 120 and 240.
Tier 21 - roof 3 begins with tier 20 terrace facing 240 then rises up symmetrically with 3 wings facing 0, 120, and 240.

Tier 18, 19, and 20 wings are 6 M long.
Tier 20 - roof 2 begins with tier 19 terrace facing 120 then rises up with 1 wing facing 240.
Tier 19 - roof 1 begins with tier 18 terrace facing 0 then rises up with 2 wings facing 120 and 240.
Tier 18 begins with Tier 17 terrace facing 300 then rises up symmetrically with 3 wings facing 0, 120, and 240.




They are working on the first level / section of tier 18. We can see the terrace faces opposite of the shot - 300 degrees and the 3 wings of tier 18 facing 0, 120, and 240 degrees. Then tier 18 top (first section of tier 19 terrace) faces 0 degrees (North) or where Ember's 20 is. My methodology can then be followed to get the rest. Also tier 27 to 30 are circular.

I could make an accurate diagram using the pic like Ember did if anyone is interested.

No offence intended Ember.

Thanks Fury.
So, to put it another way, at the top of Tier 18 the wing with '18' on it in Embers pic stops and the other 2 wings continue to the top of Tier 19 where the '20' wing stops? Then the final wing '19' continues to the top of Tier 20?
Then the same thing continues with Tiers 21, 22, 23 but with the smaller scale wings within the triangular core section and so on?

So if you like Tier 18 is a full or symmetrical tier with all 3 wings with 21, 24, 27 being the same?

Last edited by B787-938; April 23rd, 2008 at 05:33 AM.
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Old April 23rd, 2008, 10:28 AM   #6305
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These builders are real supermen!!!
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Old April 23rd, 2008, 10:54 AM   #6306
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But I`m surprised - at top working so less workers?! They have to increase the amount!
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Old April 23rd, 2008, 11:01 AM   #6307
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flickr, april 16th by Stewie1980

image hosted on flickr


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April 22th by Potdeyahourt

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Old April 23rd, 2008, 11:02 AM   #6308
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TO AXEL.....::__increase>>?????? there are 4000 workers working there....It s normal. U expect 100 workers to work at 35 degrees at that height....???Anyway,i wonder how long does it takes for the cranes to lift the steel segments from that height>.....Maybe that s why they are going so slow....and the heat as well,.....
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Old April 23rd, 2008, 11:03 AM   #6309
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WOW!!beutiful pictures!!
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Old April 23rd, 2008, 11:12 AM   #6310
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More pics on Stewie1980 flickr own page:



http://www.flickr.com/photos/stewie1980/
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Old April 23rd, 2008, 11:28 AM   #6311
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Quote:
Originally Posted by Fury View Post
Hi all.

Here is the 2 pics from the crane.

08 04 03

http://img217.imageshack.us/img217/6...theburjlp4.jpg

08 04 06

http://img518.imageshack.us/img518/9...theburjdk9.jpg

IMO reasonable progress for 3 days.

Let me repeat from a prev. post - I hope this photog will continue to take pics from here. Nice perspective.

what's the source of these photos?
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Old April 23rd, 2008, 11:56 AM   #6312
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I get vertigo just looking at that top down photo. Awesome.

BTW, there's a google sketchup model (chido.skp??) of the BD doing the rounds. Anyone spotted the man sitting on the top of the spire?
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Old April 23rd, 2008, 12:36 PM   #6313
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Quote:
Originally Posted by Fury View Post
Hi all.

Here is the 2 pics from the crane.

08 04 03

,,,snip...

08 04 06

...snip...

IMO reasonable progress for 3 days.

Let me repeat from a prev. post - I hope this photog will continue to take pics from here. Nice perspective.

Great stuff

That looks like a very sturdy "little" tower they are building out of steel.
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Old April 23rd, 2008, 12:49 PM   #6314
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Quote:
Originally Posted by fröding View Post
Too bad Burj Dubai will be beaten by this 1 km tall sun tower in Namibia:

Wow...that looks like the world's biggest crack pipe!!!..

Breaking News: Amy Whinehouse moves to Namibia!

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Old April 23rd, 2008, 01:05 PM   #6315
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Quote:
Originally Posted by lucianmx_2007 View Post
TO AXEL.....::__increase>>?????? there are 4000 workers working there....It s normal. U expect 100 workers to work at 35 degrees at that height....???Anyway,i wonder how long does it takes for the cranes to lift the steel segments from that height>.....Maybe that s why they are going so slow....and the heat as well,.....
2 and a half to 3 minutes... there's also at least 14 more tower sections on the ground at about 2.5 metres high... by the time these cranes reach their highest operating level... it'll be about 3.5 minutes...
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Old April 23rd, 2008, 01:55 PM   #6316
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Quote:
Originally Posted by Skymyhusband View Post
More pics on Stewie1980 flickr own page:



http://www.flickr.com/photos/stewie1980/



Merci beaucoup!

But I allready posted the pictures on page 315!
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Old April 23rd, 2008, 02:01 PM   #6317
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Quote:
Originally Posted by DiazZ View Post
I wonder if the weight from the cranes cables give a problem at this height. I mean 650meters of steel cables must weigh a lot aswell. Maybe they even have to use smaller pieces of steel because of that?
That's a very good point actually. Not quite on the same scale as the Space Elevator (http://en.wikipedia.org/wiki/Space_lift) but it must surely come into play?
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Old April 23rd, 2008, 02:30 PM   #6318
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Agree, good point. But maybe the smaller crane in the height 350-400 meters lifts the pieces from ground to the tier 13-14 or which one that is and then the top cranes take it from there so the crane cables don't have to be 600m+ long...
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Old April 23rd, 2008, 03:04 PM   #6319
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Quote:
Originally Posted by abc View Post
2 and a half to 3 minutes... there's also at least 14 more tower sections on the ground at about 2.5 metres high... by the time these cranes reach their highest operating level... it'll be about 3.5 minutes...
just one question. How can a crane have a highest operating height? I thought these Kangaroo Cranes were self raising and thus would get taller as the building got taller
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Old April 23rd, 2008, 04:01 PM   #6320
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I looked up some formulas.

One says that the force a "standard" steel cable can take is

F= 700[N/mm^2] * d^2 [mm]

So now the weight-force of that cable would be

(d^2 * Pi / 4 ) [m^2] * length [m] * 7850[kg/m^3] * 9.81[m/s^2]

So you put that in an equation and transform 700 [N/mm^2] to 700,000,000 [N/m^2] you get that the maximal length of a steel cable can be 11573 metres = 11.6 km.

At this length it will break due to its own weight. Notice that this is not dependent from the diameter anymore!

So let's look at that at more convenient data for the burj. Let's estimate a cable diameter of 15mm=0.015m. The gravity force of a 900meter cable of that diameter would be

0.015^2*Pi/4 * 900 *7850*9.81= 12247.67N what makes 1224kg or 1.224 metric tons.

The maximum load of that 15mm cable would be: 700N/mm^2 * 15^2 mm = 157500N what makes 15750 kg or 15.75 tons.

Substract the weight of the cable itself... the crane could lift about 14.5 tons from the ground.
Of course there is a high security factor of i guess... ~5.

The crane could lift about 3 tons from the ground from 900 metres up.

PS: This value doesnt change very much as the length increases... i calculated it for several cable lengths with a security factor of 5:

Diameter 15mm in all cases:

length maximum load

100m 3.12 tons
200m 3.09 tons
300m 3.06 tons
500m 3.01 tons
600m 2.98 tons
700m 2.95 tons
800m 2.93 tons

So the height of the tower doesnt have any real influence on the lift weight. This fact gets eaten by the security factors anyway.

Last edited by idkblk; April 23rd, 2008 at 04:46 PM.
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adrian smith, burj dubai, burj khalifa, downtown, dubai, dubai tower, emaar, megatall, middle east, rascacielos, sarajevo construction, skyscraper, spire, tallest, uae

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