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Old 12-13-2018, 08:05 AM   #141
bigpicture7
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Re: San Francisco high-rise sinking, tilting

Some cool details on the proposed fix:

https://www.enr.com/articles/46053-r...several-months



They are planning to extend the tower's 10ft thick mat slab outboard, then literally pile jack the extended mat with bedrock-anchored piles:
Quote:
Piles would extend up through an 8-ft-wide extension of the tower’s 10-ft-thick reinforced concrete mat—4 ft from the old mat. New and old mats would be connected by chipping into the side of the old mat and coupling new reinforcing steel onto existing rebar.
Fascinating:
Quote:
The system relies on loading each pile with 800,000 lb using a permanent hydraulic jack that reacts against a new mat extension. The jacks would be housed in a maintenance access vault above the mat (see diagram, facing page). The team has applied for an easement to work under the sidewalks, which meet at the northwest corner of the block.
The quick math: 800k lb x 52 piles = 41.6 million lb of jacking force
(holy moly)
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Old 12-13-2018, 10:18 AM   #142
Justin7
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Re: San Francisco high-rise sinking, tilting

^ This is awesome.
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Old 12-24-2018, 09:21 AM   #143
Brad Plaid
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Re: San Francisco high-rise sinking, tilting

The SF tower now has some competition in Sydney.
https://www.bbc.com/news/world-australia-46671811
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Old 12-24-2018, 10:15 PM   #144
odurandina
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Re: San Francisco high-rise sinking, tilting

36 story/384' Opal Residential Tower in Sydney evacuated after residents

hear loud banging sounds and discover cracks.........

https://www.foxnews.com/world/thousa...rs-of-collapse
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Old 12-26-2018, 05:23 PM   #145
stick n move
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Re: San Francisco high-rise sinking, tilting

I cant get past the paywall but by jacking it is that just to anchor it to bedrock finally or will the jacks move it back the 4” it tilted?
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Old 12-26-2018, 09:05 PM   #146
chmeeee
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Re: San Francisco high-rise sinking, tilting

The plan is to allow the sinking side so that the other side will sink a bit to relevel it.
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Old 04-12-2019, 10:58 AM   #147
stick n move
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Re: San Francisco high-rise sinking, tilting

NYC now has its own leaning tower. I never remember this happening before, now theres multiple examples...

“The contractor on Fortis Property Group’s Lower Manhattan apartment building is suing the developer, claiming the shiny tower is leaning 3 inches north. Pizzarotti, the contractor on the project at 161 Maiden Lane, filed a lawsuit against Fortis in New York State Supreme Court, Commercial Observer reports. Pizzarotti has overseen construction since 2015, and claims poorly executed foundation work done before it joined the project is causing the problem.”



https://www.bisnow.com/new-york/news...aims-98352#ath
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