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How they raise cranes on tall buildings
Posted by: pRICE cUBE
Date: June 10, 2020 08:56PM
Learning something new every day.
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Re: How they raise cranes on tall buildings
Posted by: Don C
Date: June 10, 2020 10:41PM
So it's not some kind of midnight magic, then?

I have always wanted to see this happen (I'd settle for taking one down) but of course I am never around a construction site when that happens. I take consolation that even if I happened upon this process it would be too high up to see what is happening.
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Re: How they raise cranes on tall buildings
Posted by: Mr Downtown
Date: June 10, 2020 11:09PM
I get to see it out my windows every couple of years as a new building goes up in my neighborhood. An actual crane jump takes a few hours, usually done on a Saturday, so it's not all that exciting to watch. Two hours of loosening and safety strapping, 12 minutes of jacking, two more hours of resecuring everything.
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Re: How they raise cranes on tall buildings
Posted by: N-OS X-tasy!
Date: June 11, 2020 12:32AM




It is what it is.
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Re: How they raise cranes on tall buildings
Posted by: Fritz
Date: June 11, 2020 08:55AM
that is such a hoax.
Everyone knows it's contracted ETs.



!#$@@$#!

If there are spelling issues, please pardon, Owen the cat is sitting on my keyboard.
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Re: How they raise cranes on tall buildings
Posted by: bruceko
Date: June 11, 2020 10:39AM
I am more interested in how they take them down from tall buildings.
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Re: How they raise cranes on tall buildings
Posted by: timg
Date: June 11, 2020 11:31AM
Quote
N-OS X-tasy!

SQUIRREL!!



Skill without imagination is craftsmanship. Imagination without skill is Modern Art.
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Re: How they raise cranes on tall buildings
Posted by: macphanatic
Date: June 11, 2020 12:18PM
In all the high-rise construction projects I've been involved with never had tower cranes that were like that. In all cases, a heavy concrete base was poured and the crane always supported by that base. I can only imagine the construction cost increase to support a tower crane from upper floors. Buildings aren't designed to take that load. The depiction of self jacking is accurate though. They jack the tower and insert another section under it. At certain levels, they "tie" the tower to the building to limit sway.
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Re: How they raise cranes on tall buildings
Posted by: jonny
Date: June 11, 2020 01:00PM
Ugh... what a pain. Why don't they just use sky hooks?
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Re: How they raise cranes on tall buildings
Posted by: macphanatic
Date: June 11, 2020 01:05PM
Quote
jonny
Ugh... what a pain. Why don't they just use sky hooks?
Elon Musk is working on it.
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Re: How they raise cranes on tall buildings
Posted by: Carm
Date: June 11, 2020 07:23PM
For a second.... why would someone raise Cranes (large birds) in a building. We had just seen a Disney Nature video.
emoticon-animal-022
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Re: How they raise cranes on tall buildings
Posted by: NewtonMP2100
Date: June 11, 2020 11:10PM
....with a stern hand and a soft heart [ like how to raise children? ].....????



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Re: How they raise cranes on tall buildings
Posted by: Racer X
Date: June 12, 2020 01:20AM
Quote
bruceko
I am more interested in how they take them down from tall buildings.

If you are working for Google, you take a few bolts out.



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Re: How they raise cranes on tall buildings
Posted by: Mr Downtown
Date: June 12, 2020 08:41AM
Quote
bruceko
I am more interested in how they take them down from tall buildings.

With smaller cranes.

As one of its last acts, the tower crane will lift to the roof a smaller derrick that can be used to support unbolted sections of the big crane and lower them to the ground.

Then the derrick will itself be disassembled, which might require a small portable crane that can return to the ground in a freight elevator or the construction hoist.

For buildings under about 40 stories, though, they most commonly just bring in a portable crane with a long, long boom for a day. While the street is closed off, it will lower the pieces of the tower crane, and then everything is driven away.



Edited 1 time(s). Last edit at 06/12/2020 08:48AM by Mr Downtown.
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