Foundations of 100 story Broad Group Skyscraper and test sections of the Sky City Building

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A site is indicating that the foundations of a Broad Group 100 story (J100) factory mass produced skyscraper has been laid. Broad Group is famous for building 15 story buildings in 6 days and 30 story building in 15 days. They are also getting permits to build a 200+ story skyscraper that would be world’s tallest. They are moving ahead with a 100 story skyscraper.

Broad Group has built a slice of the Sky City building. It appears to be floors 165 through 173, where the building reduces to a square form for its final 32 floors. It is built with a different structural system than the other BSB structures, which had columns sitting on stubs built into the floors, and diagonal bracing to stiffen the structure and give it lateral stability; That system was only good for about 30 stories.

Now the prefab floors are independent of the structure, which is made from a steel frame that is bolted together. There is a price to be paid for this in terms of weight; where the older design took about 80 kilograms of steel per square meter of area, the new structure is 120 kg/m2. However that is still less than conventional construction and now the sky is the limit.

Lloyd Alter/CC BY 2.0 via Treehugger

Lloyd Alter/CC BY 2.0 via Treehugger

There are advantages to eliminating the diagonal bracing, including much bigger windows.

Lloyd Alter/CC BY 2.0 via Treehugger

One of the key features of Sky City is the “columnless square” elements found every three floors; this is to be used for public functions such as sports, theatres, and vertical farms.

Lloyd Alter/CC BY 2.0 via Treehugger

A network of interior ramps act as “sky streets”, you can walk from top to bottom, all six miles of it. This would be a serious hike; I found the ramps to be a little steep by North American standards. But there are great views overlooking the squares.

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