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Old December 10th, 2005, 11:15 AM   #201
malec
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Quote:
Originally Posted by TowerPower
Even ruling out all smog you'd still have to look almost 500 km to see Bahrain from Dubai.
So, no way.
On the clearest day you could see the tower from a maximum of about 100km away. I calculated it for a 700m tower before and it turned out about 90km. (this is base on the curvature of the Earth)
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Old December 10th, 2005, 02:17 PM   #202
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Quote:
Originally Posted by Dubai-Lover

palm deira = bigger than manhattan, construction has just begun

skyline in deira = this is the slyline along the creek with about 30 high-rises and a few more coming up, can be described as the heart of dubai

park square = a new project launched recently next to a brand new recreation park, which has not yet opened but is awesome!!!
this is where the 666m park square tower will rise. park square has 40 to 50 high-rise plots

new dwtc = a project launched 3 days ago, a brand new wtc with 40 high-rises

dubai international financial centre = the name says it all, 50 high-rises if not more

burj dubai downtown - you know what it is, about 100 high-rises +

business bay = a mammoth project with more than 250 towers and thousands of villas built around an extended creek which is coming from the right side of the pic and will be extended back to the sea. currently the creek is running alone this deira skyline which you can see in the background. it ends about 10km in the continent and will now be expanded all the way back into business bay and straight back to the sea

BLOODY HELL!! how many people live in dubai? because that is a MAMMOTH number of buildings goin up!! How long can they sustain it?
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Old December 10th, 2005, 08:04 PM   #203
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a very interesting artcile from today


Level 17: Burj Dubai continues long climb into record books


Changing the skyline: The world’s tallest tower is expected to top the 800 m mark, dwarfing the skyscapers that currently dominate Sheikh Zayed Road.

CW explores how the challenges of construction are being met as the world’s tallest tower takes shape in dubai
Currently standing at floor number 17, the Burj Dubai is slowly creeping towards its final height of 160 floors.

Approximately 250 000 m3 of concrete, 35 000 tonnes of steel and 40 000 trucks to deliver the concrete and steel to site are being used on the project.

To meet this logistical challenge, several new technologies are being employed in the design and construction of this US $3.2 billion leviathan.

The cranes and hoists; the concrete for the vertical elements; the speed of the lifts; and the formwork, all feature technology and methodologies which are pushing the construction boundaries.

The height of the Burj was originally penned at 723 m, but this has since been extended. Emaar is still keeping the final figure under wraps, but it is expected to top 800 m.

The additional height will be gained by extending the steel pinnacle that sits above the 575 m-tall reinforced concrete shaft core.

According to construction manager Saad Al-Joudi, design
restrictions mean the final height of the concrete section (154 floors) cannot be extended any more — wind tunnel tests have shown that people standing on the top floor of the Burj will be treated to a 1.6 m sway.

One factor limiting the height of the building is the capacity of the cranes — and the massive weight of the cables themselves.

Each of the three tower cranes on the Burj has a maximum lifting capacity of 25 tonnes, and each has a cable in the drum approximately 900 m long.

“The cable already weighs eight tonnes; if we extend the cable length, the weight of it will become unfeasible, so we do have a height limit which we cannot exceed,” says Al-Joudi.

Dismantling the three tower cranes will require a complex process. The first crane will be dismantled using the other two cranes; the third crane will dismantle the second crane; then jump form technology will be used to dismantle the final crane — which could take up to one month.

The design lifetime of the Burj is another achievement. While new regulations stipulate that a design lifetime should be 35 years or 40 years, the design lifetime of the Burj is 100 years.

All of the concrete used on the project is triple or four blends.
“The concrete quality used on the slabs is grade 35, and for the vertical slabs we’re using grade 80,” explains Al-Joudi.
The aggregates for the concrete come from the mountains of Ras Al Khaimah and Fujairah.

How to transport hundreds of people within the building is a crucial element in the tower’s design, with Otis winning the contract to supply around 60 lifts of different specifications in the Burj tower and ancillary buildings.

Triple-decker lifts — which would have been a world first — were at one time under consideration but this was later modified to double-decker lifts, and this will be the first time
that such lifts are installed in the Middle East.

The Burj will also feature some of the fastest lifts in the world: Two lifts will carry visitors from the ground floor up to the 120th floor in one minute (travelling at 10 metres per second).

While Austrian firm Doka is supplying the self-climbing
formwork for the Burj, Germany’s Hünnebeck is providing the plan and materials for the wall, soffit and joist formwork for the five to nine-storey podium area — in addition to the soffit and joist formwork for the first 10 storeys of the tower itself.

For the soffit areas in the podium and tower alone, Hünnebeck is supplying 9500 m2 of Variomax wooden beam formwork; almost 5000m2 of table forms; 900 ID 15 frame supports; and around 12 000 tubular steel props to the site.

All of this will be joined for the walls and columns by approximately 1000 m2 of Manto giant frame formwork, 14 Manto column sets and almost 700 m2 of Ronda circular formwork.

According to Frank Odzewalski, CEO of Hünnebeck Middle East, the main advantage of using the Manto giant steel-frame formwork on the walls is its aligning clamp, which connects the Manto panels flush with tension- and vibration-resistant joints in a single action.

“The easier the handling of the formwork equipment employed, the smoother the operations on site,” he says.
The aligning clamp permits the multi-panel erection, lining and moving of up to 40 m2 of Manto elements with a single crane lift, without having to fit extra stiffeners.

Another benefit of Manto is its frame thickness of 14 cm.
This and the interior stiffening ribs make the panels extra rugged and permit full-speed concrete pouring up to a height of 3.3 m.

Hünnebeck’s formwork is being used to produce the spindle-
like entrances and exits of the multi-storey car park — a task that calls for some sophisticated formwork engineering. The wall surfaces are being poured with Ronda circular formwork, which enables the creation of circular radii from 2.75 m upwards with millimetre precision.

In the areas where relatively large slab surfaces have to be shuttered (eg on the parking decks), Hünnebeck’s project planners recommended using soffit table forms. For the other slab areas in the podium — and particularly the first 10 slabs in the tower where small and confined areas need to be shuttered — Variomax wooden beam formwork is being used.

The Variomax system’s adaptability and versatility is particularly useful for the tower, which calls for the shuttering of joists of varying dimensions. Variomax is suitable for room widths of less than 2.65 m, slab thicknesses of over 30 cm and room heights of over 4.5 m.

On the project, the wooden beam formwork is being supported not only by tubular steel props, but also by ID 15 towers. In the multi-storey car park they are supporting the inclined ramps of the entrances and exits — with a footprint of just 1 m by 1 m. The load supports have an articulated bearing plate on the head and base jacks, which can cope with adaptation to pitches of up to 6%.

According to Odzewalski, the frame support is simple to handle: “Because none of the small number of parts weighs more than 19 kg, they are particularly easy to erect and dismantle. An ID 15 tower can be assembled to the desired height on its side on the ground, before being lifted upright and positioned by the crane.”

Odzewalski and his team were faced with a logistical challenge when delays caused the contracting JV to change the concreting cycle for the first 10 tower slabs.

Instead of pouring in succession (as originally planned), the second and fourth slabs were leapfrogged at short notice. This resulted in slab heights of almost 10 m, which demanded the rapid extension of the required number of ID15 supports.

As the Burj Dubai inches towards its accolade of being the world’s tallest building (as well as the world’s tallest man-made structure), the designers and construction teams are constantly finding new challenges to overcome.

“By the end of next year, we won’t be able to see the men working at the top of the structure from down here on the ground,” says Al-Joudi.

To counter this, the team is using satellite navigation systems from Leica to help ensure accurate levels of measurement and precise construction techniques.

“Seven control points have been planted within the steel piles on the site,” explains Al-Joudi. “These points are checked on site and counter-checked with another control system placed on top of a nearby building.”

The scale of the project means that logistics will play an increasingly important role as construction of the tower progresses and nears its scheduled completion date of December 2008.

“Currently there are 2300 construction workers on site; this figure will peak at around 8000 in August or September next year,” says Al-Joudi.

“The physical aspect of actually delivering the materials to site — not to mention raising them 800 m up — calls for some very close coordination,” adds Uwe Hinrichs, NSC/BWIC chief coordinator.

But since overcoming seemingly insurmountable obstacles
is a key element of this project, the task of coordinating materials for the half mile-high Burj will surely be par for the course.
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Old December 10th, 2005, 08:23 PM   #204
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1.6 m sway!

nice statistics! Thanks! The 1.6 m sway would make me sick when trying to sleep at night but I think one gets used to that after a little night-cap

Last edited by minime; December 10th, 2005 at 08:55 PM.
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Old December 10th, 2005, 09:03 PM   #205
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Very interesting.
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Old December 10th, 2005, 10:11 PM   #206
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yepp and some amazing figures and facts.
this tower will rise at an immense speed in some time...
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Old December 10th, 2005, 10:28 PM   #207
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theres no reference point, so it is said that occupants wont even notice it... maybe unless you have a big glass of water sitting on a table..
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Old December 10th, 2005, 10:37 PM   #208
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Can't they use those gigantic russian helicopters to tear the crane down?
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Old December 10th, 2005, 11:42 PM   #209
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amazing stuff
speechless
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Old December 10th, 2005, 11:44 PM   #210
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Quote:
Originally Posted by Bender
Can't they use those gigantic russian helicopters to tear the crane down?

well i guess it could be dangerous for the workers ..
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Old December 10th, 2005, 11:58 PM   #211
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Quote:
Originally Posted by Bender
Can't they use those gigantic russian helicopters to tear the crane down?
You mean the Sikorsky's?
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Old December 11th, 2005, 12:22 AM   #212
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I don't know the name

Sikorsky is not Russian, isn't it? Anyway, that's probably a stupid idea (even if I don't see why it would be dangerous for workers) and I don't want to digress.
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Old December 11th, 2005, 01:51 AM   #213
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Quote:
Originally Posted by CrazyCanuck
You mean the Sikorsky's?
Sikorsky is an american company
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Old December 11th, 2005, 07:01 AM   #214
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$3.5 To Build a Tall One?

If it takes 3.5B to build in Dubai, can anybody have the $4B to build a tall one in the US? Or, since 9/11, will there ever be one taller than Sears highest floor (not crappy spires)?
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Old December 11th, 2005, 10:48 AM   #215
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the whole project is $3.5 billion.

the tower itself costs $1 billion
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Old December 11th, 2005, 02:24 PM   #216
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the whole projects is confirmed to be over 20B after all.
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Old December 11th, 2005, 02:25 PM   #217
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Quote:
Originally Posted by dubaiflo
the whole projects is confirmed to be over 20B after all.
but that's not in $$$

It's actually twice the cost luv2bebrown said
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Old December 11th, 2005, 05:41 PM   #218
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Kilometer tall building

Hey guys. Thought you might be interested in this article from New Scientist of another super tall building. It has references to the Burj Dubai. Take care.



http://www.newscientist.com/article.ns?id=dn8445
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Old December 11th, 2005, 05:48 PM   #219
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The skyscraper could house 7000 people, but would cost an estimated £84bn to construct and could take 25 years to complete.
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Old December 11th, 2005, 06:10 PM   #220
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Quote:
Originally Posted by Marky30
Hey guys. Thought you might be interested in this article from New Scientist of another super tall building. It has references to the Burj Dubai. Take care.



http://www.newscientist.com/article.ns?id=dn8445
could take 25 years to complete

Newscientist obviously didn't had enough knowledge to know that they got fooled. The key to make huge projects profitable is a short building time. This article is cannot be taken serieus by me.
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