Posted on 05/01/2015 8:09:54 AM PDT by JoeProBono
CHANGSHA, China (AP) — A Chinese construction company is claiming to be the world’s fastest builder after erecting a 57-story skyscraper in 19 working days in central China.
The Broad Sustainable Building Co. put up the rectangular, glass-and-steel Mini Sky City in the Hunan provincial capital of Changsha using a modular method, assembling three floors per day, company vice president Xiao Changgeng said.
(Excerpt) Read more at seattletimes.com ...
Compressive strength of concrete over cure time
Another zombie building. Just what the Butchers of Beijing need.
And how does that apply to support requirements of said concrete when it isn’t a support factor in the overall steel structure of the building.
I get what this graph implies, but how does the curing time of a section of concrete poured in an assembly factory beforehand and installed into a steel structure affect integrity of the structure stand as a whole as long as the cure time for days cured meets engineering requirements. The weight of it, cured or uncured, is still relatively still there. Seems to me curing and moisture conditions are much more controllable in an enclosed environment, and I can personally attest that curing in a hot zero moisture environment isn’t good. In my case it eventually became crumbling rotten concrete.
From everything I could see was that everything was preformed/poured and set before transport to assembly with the exception of weld/rivet work on the steel cross bracing. As long as it isn’t required to withstand full test/cure loads after a given time after completion, how does this graph change things?
I think I was gonna reply to you but I was transfixed on the headlights.
Kaise Yard #2 in California built the Liberty ship Robert E. Peary in 4 days 15 hours and 29 minutes in 1942.
That’s a woman? She has a bad case of man-legs.
Why stop at 57?
I want to know how many spare parts they had.
The computer thought you meant “topless” perhaps?
Is it earthquake resistant?
What does the foundation look like? Was it done before the ground became rain soaked as the pic shows?
I jumped the gun on this after only watching the time lapse video.
The Telegraph UK photo gallery provides scant text information but the photos reveal quite a bit more.
From these it appears that floors are composite slabs on box trusses of some sort assembled off-site. From the video. only the pre-fab exterior wall sections are apparent, but that’s time lapse video for you.
The structure has been substantially reduced from the original mammoth and highly boastful proposal. Broad criticism from structural engineers indicated that the original design ignored the wind loads involved in super high rise buildings not to mention the stiffness required for pr statement that the design would resist scale 9 earthquakes. Apparently the design/contract firm hired the noted Arup Engineering firm to do the structural analysis resulting in the new Mini-Sky project in the AP pr release. Which by the way seems to be the source for almost all the news about this building.
Looking forward to reading western engineering reviews of the process.
As a side note, I watched the collapse of a portion of the Crystal City project from our design office window, circa 1967. The developer had been bragging to the press of the speed of construction just days before. I remain sceptical of such speed claims.
Shanghai--2009
Just me, but I’d tend to want to have a foundation for a high rise a bit deeper than 1-2 feet.
Thanks!! That is the picture I was thinking of.
That’s Japanese.
Bribes will usually go a long way in getting rid of troublesome things like building permits and government safety inspections.
>> What does the foundation look like? <<
Are you referring to post no. 21? I don’t see any evidence of a foundation.
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