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Old January 12th, 2018, 08:48 PM   #8341
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Central park tower & 220 Central park south

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Old January 14th, 2018, 04:24 PM   #8342
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Originally Posted by ILNY View Post

Is this how they build the supertall, with small "buckets" of concrete lifted hundreds of feet up one at a time? No concrete pipe ? Can somebody explain?
Originally Posted by Uaarkson View Post
Past a certain height, the cost of stronger pumps is outweighed by the savings of a slower and more labor-intensive method.

This building has pretty small floorplates. They probably wouldn't be doing this with a large office tower, but then that's why most of those buildings are made with steel.

I really doubt they are building this tower with concrete buckets.

The time it takes to fill it, then lift it up one hundred, two hundred, three hundred, four hundred, meters in the air, then pour the concrete and lowering back, and just one at a time, would extend a lot the time to build the tower. It could be like twenty minutes for each operation and you can only pour a very small part of a structural element, so you have to repeat the operation many, many times, just to complete a floor. And meanwhile, you don't have the crane available for lifting other things. And even if the floorplate is not that large, is a very tall tower, meaning that it has larger structural elements that use more concrete, like pretty thick loading walls.

The height for the pump is not an obstacle, they already build 432 park using pumps, and also taller towers, such as Burj Dubai and the Shanghai Tower. What they usually do is using pump stations, for example, they use a pump that lift the concrete the first 100 meters, than another pumps it for the next 100 meters, and so on.

That bucket in the picture is probably used just eventually. Could be for pouring a structural element that is out of reach of the arm of the pump, such as a corner column or that they are using it for a small element that doesn't justify to turn on the pumps just for it, or maybe a pump is broken or in maintenance, so they use buckets temporarily.

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Old January 15th, 2018, 12:53 PM   #8343
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Old January 15th, 2018, 06:27 PM   #8344
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14 January 2018

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New York City Subway: 25 services, 380 km, 425 stations.
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Old January 16th, 2018, 10:36 PM   #8345
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Old January 17th, 2018, 12:03 AM   #8346
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Old January 17th, 2018, 12:52 AM   #8347
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By my count they're at the next transfer floors.
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Old January 18th, 2018, 12:26 AM   #8348
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217 west 57th street, 225 west 57th street, central park south, cps, extell, new york, nordstrom tower, nyc, supertall

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