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Old May 28th, 2013, 06:19 PM   #1421
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Any word on pilings or foundation work?
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Old May 28th, 2013, 11:40 PM   #1422
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Quote:
Originally Posted by AltinD View Post

The fastest reinforced concrete core level progressing so far has been in a 3 days cycle, so that alone would require in a a ideal hypothetical situation, a minimum of 660 days.
I am optimistic that techniques and materials have improved in erecting steel structured supertalls since the WTC and 'Sears' Tower.
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Old May 29th, 2013, 10:14 AM   #1423
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Quote:
Originally Posted by PMadFlyer View Post

I am optimistic that techniques and materials have improved in erecting steel structured supertalls since the WTC and 'Sears' Tower.
Of course they have
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Old May 29th, 2013, 01:21 PM   #1424
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Quote:
Originally Posted by NEO-TOKYO View Post
The way these pre fabricated buildings are being made, could they ever actually build different shaped buildings in the future, or just boxes?

Anything is possible with prefab construction. But do note that the main selling point for this project is 'sustainability'.


For example, this could have been a good prefab candidate ...

By tiger1018



Imagine clusters of 'Sky Cities' linked by a sustainable mode of public transportation such as a suspended monorail system.

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Old May 29th, 2013, 04:13 PM   #1425
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Quote:
Originally Posted by PMadFlyer View Post
I am optimistic that techniques and materials have improved in erecting steel structured supertalls since the WTC and 'Sears' Tower.
concrete =/= steel ... unless you are saying that the building could be build with a steel core.

Regardless, I stay put to the idea that the building must have a solid central core to stand up. Prefab elements do not provide structural strength.
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Old May 29th, 2013, 04:54 PM   #1426
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Quote:
Originally Posted by skyridgeline View Post
Anything is possible with prefab construction. But do note that the main selling point for this project is 'sustainability'.


For example, this could have been a good prefab candidate ...

By tiger1018
I was trying to find this building - designed by BIG I believe. I completely agree, this design would be a perfect design for Sky City. It would have garnered much more support and recognition for the project if only the building design was "prettier".
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Old May 29th, 2013, 09:39 PM   #1427
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The real Sky City looks far better than that modelled building
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Old May 29th, 2013, 10:35 PM   #1428
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Quote:
Originally Posted by AltinD View Post
concrete =/= steel ... unless you are saying that the building could be build with a steel core.

Regardless, I stay put to the idea that the building must have a solid central core to stand up. Prefab elements do not provide structural strength.
We still have to remember that it has been done before. The Twin Tower's exteriors were prefabricated in sections 2.5 stories tall and three columns wide and bolted together in the field as were the prefabricated floor panels. And the steel structured core allowed tenant space within the core.
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Old May 29th, 2013, 10:42 PM   #1429
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Quote:
Originally Posted by XGADGET View Post
I was trying to find this building - designed by BIG I believe. I completely agree, this design would be a perfect design for Sky City. It would have garnered much more support and recognition for the project if only the building design was "prettier".
that building you quoted is called Rose Rock IFC in Tianjin, if you still search it.
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Old May 29th, 2013, 11:27 PM   #1430
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Quote:
Originally Posted by PMadFlyer View Post
We still have to remember that it has been done before. The Twin Tower's exteriors were prefabricated in sections 2.5 stories tall and three columns wide and bolted together in the field as were the prefabricated floor panels. And the steel structured core allowed tenant space within the core.
But still they had a core ..... although, this building is twice as tall, plus, wasn't the hollow metal core blamed in part for the collapse?
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Old May 29th, 2013, 11:41 PM   #1431
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Quote:
Originally Posted by AltinD View Post
But still they had a core ..... although, this building is twice as tall, plus, wasn't the hollow metal core blamed in part for the collapse?
The core stood briefly after the rest of the tower collapsed around it. I've seen multiple videos and pictures of this in researching for images of 1WTC's spire. The cores had almost no shear strength and so they are seen crumbling after the rest of the structure is gone. I'm not into the whole conspiracy BS and I don't want to start an off topic conversation, but here are some pictures of the core standing alone, albeit briefly.



I apologize for posting controversial images, but these are the only example of this.
As for the core being the cause of failure more so than the exterior, I lean more towards a universal load path failure. This tower seems to have far more in common with the Willis tower though.
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Old May 30th, 2013, 02:22 AM   #1432
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The WTC buildings had an outer tube and a core that were only connected by the floor trusses, which really contributed to the catastrophic failure. The way I understand it, because the floors themselves were part of the structure, once the floors started collapsing, the rest of the structure failed as well, and because the floors were sort of separate, some of the vertical structure survived (core in one tower, some of the outer tube in the other one)
Of course, a major contributing factor to the collapse of the WTC buildings was the aircraft impacts, causing substantial structural damage, and also starting fires on multiple floors at the same time.

From what I have seen so far, Sky City has a grid structure of structural steel with the floors inserted in between, so the floors aren't actually part of the structure holding the building together. This should hopefully mean that it would be impossible for the building to fail catastrophically like in the WTC buildings.
Not really a nice subject to discuss.
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Old May 30th, 2013, 03:38 AM   #1433
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:O
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Old May 30th, 2013, 08:59 AM   #1434
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Stop it.
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Old May 30th, 2013, 12:05 PM   #1435
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9/11 made architects and builders rethink a lot of constructions and design and i think since then safety standards got a lot higher, even in chinese construction. Sky city took a long time to get approved, so i think and hope that during that time a lot of tests were done declaring the structure safe.
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Old May 30th, 2013, 04:18 PM   #1436
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Quote:
Originally Posted by MattTheTubaGuy View Post
From what I have seen so far, Sky City has a grid structure of structural steel with the floors inserted in between, so the floors aren't actually part of the structure holding the building together.
But would the assembling of this structure alone would require longer time then what they are saying? (and that's my main point)
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Old May 30th, 2013, 08:32 PM   #1437
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Quote:
Originally Posted by skyridgeline View Post
Anything is possible with prefab construction. But do note that the main selling point for this project is 'sustainability'.


For example, this could have been a good prefab candidate ...

By tiger1018



Imagine clusters of 'Sky Cities' linked by a sustainable mode of public transportation such as a suspended monorail system.

This is a bit off topic but how do you evacuate a suspended monorail? In NY a few years ago there was a problem with the tram that takes people to Roosevelt Island and it took a very long time to get people out.
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Old May 30th, 2013, 10:22 PM   #1438
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Quote:
Originally Posted by AltinD View Post
But would the assembling of this structure alone would require longer time then what they are saying? (and that's my main point)
There are two major limiting factors that are troubling to me. One being wind and the other being hoist speed. They can't use ground based mobile cranes as they normally do and will be forced to wait several minutes between lifts. I almost wonder if the "street" will literally be used as a street for trucks and light mobile cranes in a constant train. If that were the case then this could revolutionize mega tall construction. No more waiting between lifts or wondering if the wind will delay the delivery of materials. I guess if my train idea is implemented, floor and exterior sections could be held on existing floors if the wind is too high to lift them into place. All of this would lower the number of delays. The single main limiting factor then is wind.
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Old May 30th, 2013, 11:40 PM   #1439
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Quote:
Originally Posted by TheZoolooMaster View Post
I just found a video that I believe has not been posted here before. It has 3D renderings of the tower and its interior, with typical Chinese subtlety :P

LMAO

I love how they used music from the movies 2012 and Transformers.

I also love how when they show the destruction of the Earth, all footage is of western civilization or Japan and they even threw in footage from the movie 2012 for good measure.
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Old May 31st, 2013, 12:46 AM   #1440
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Quote:
Originally Posted by PMadFlyer View Post
There are two major limiting factors that are troubling to me. One being wind and the other being hoist speed. They can't use ground based mobile cranes as they normally do and will be forced to wait several minutes between lifts. I almost wonder if the "street" will literally be used as a street for trucks and light mobile cranes in a constant train. If that were the case then this could revolutionize mega tall construction. No more waiting between lifts or wondering if the wind will delay the delivery of materials. I guess if my train idea is implemented, floor and exterior sections could be held on existing floors if the wind is too high to lift them into place. All of this would lower the number of delays. The single main limiting factor then is wind.
One possibility is that they leave the two column-less squares empty until they reach the last section where it stops, and lift the parts up through the middle where it would be sheltered, either using cranes, or a temporary lift.
After they reach the last section, they would use exterior lifting to fill in the floors inside, then finish the top 32 floors and the spire. That would probably mean that the last 32 floors would be slower than the rest, but by that time, they could probably start opening the lower floors, so it wouldn't be crucial to finish as quickly as possible.
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