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57-Story Skyscraper Up in 19 Days

Wednesday, May 6, 2015

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CHANGSHA, CHINA—Blitzing through three stories per day, a Chinese construction firm has topped out a new 57-tower in just 19 days.

A new time-lapse video shows how Broad Sustainable Building Co. built the world’s tallest prefab building in less than three weeks.


Built at a rate of three stories per day, Mini Sky City has 800 apartments, 19 atriums, and office space for 4,000.

Mini Sky City, located in the Hunan provincial capital of Changsha, is a prefabricated rectangular steel and glass structure.

'Assemble the Blocks'

“With the traditional method, they have to build a skyscraper brick by brick, but with our method, we just need to assemble the blocks,” the company’s engineer, Chen Xiangqian, told the Associated Press.

Modular construction is safe, earthquake proof, cheaper and uses less concrete and water than conventional construction, he added.

The Process

The company spent about five months in the factory working on the building's 2,736 components before assembling them at the jobsite, according to reports.

Mini Sky City
Broad Sustainable Building

The Broad Sustainable Building Company specializes in prefabrication and speed.

The 19 days were not consecutive:  The first 20 floors were completed in 2014 and the remaining 37 were added in January and February.

Original plans called for 97 stories, but height restrictions at a nearby airport shaved off 40 stories.

Mini Sky City has 19 atriums, office space for 4,000 people, and 800 apartments.

Space in the building will be available for purchase this month, reports relate.

Portfolio, Upcoming Project

Broad Sustainable Building is a subsidiary of the Broad Group, a privately owned company in China. The company bills itself as the “fastest builder in the world.”

Indeed, this is not the company’s first venture.

Sky City
Broad Sustainable Building

Sky City, planned for Changsha, would be world's tallest building, topping Dubai's Burj Khalifa by 30 feet. Sky bridges would connect it to Mini Sky City.

In 2010, the company built a 15-story hotel in 48 hours. In 2011, it erected a six-story dormitory in five days. In 2012 came a 30-story hotel in 15 days—a project also captured in a time-lapse video.  

Broad Sustainable Building has another ambitious project in the pipeline. Sky City is a 220-story, 2,749-foot-tall skyscraper it plans to put up in three months. Sky City would be the tallest building in the world by 30 feet.

If approved by Changsha officials, the building would be connected to Mini Sky City by way of sky bridges.


Tagged categories: Architecture; Building design; China; Color + Design; Commercial Construction; Design; Green building; Prefabrication

Comment from Michael Kramer, (5/6/2015, 6:36 AM)

Would you live in this building?

Comment from M. Halliwell, (5/7/2015, 11:09 AM)

It sounds funny to say the skyscraper went up in 19 days, but that is only the erection portion. Add in the pre-fab time, and the building took a lot longer to put up. Still, it seems that the Chinese have been working on this technique for a while with some pretty impressive successes. If I were living in Changsha, yes Mr. Kramer, I would be open to living in Mini Sky City.

Comment from Chuck Pease, (5/8/2015, 2:43 PM)

I would..... But only living in the penthouse portion with a 5000# anchorage above my head a a full fall protection harness on. :)

Comment from Chuck Pease, (5/8/2015, 2:45 PM)

See this link before you answer that question.

Comment from M. Halliwell, (5/11/2015, 10:58 AM)

Hehehe. Chuck, if the foundation is good, I'd still be okay with it the prefab building. That article from 6 years ago shows a foundation failure...something settled / moved (sounds like they suspected a flood water issue) and then the building tipped far enough to topple, pulling the piles right out of the ground on the high side. I'd actually say that article improves my faith in the above ground portions of Chinese construction....the building stayed pretty intact other than falling over, and that's pretty impressive for any building, little on a 13 storey building.

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