Posted on 11/14/2022 6:37:52 AM PST by vespa300
Millennium Tower fix engineers have scrapped an elaborate strategy designed to prevent more tilting at the troubled high-rise as they push to complete the project – a shift in strategy that critics say amounts to gambling, but monitoring data suggests is paying off so far.
(Excerpt) Read more at nbcbayarea.com ...
There are parts of cities all over the world that are built on reclaimed land. The Back bay section of Boston is all reclaimed land in an area that was part of the Charles River. The 60 story John Hancock building and 52 story Prudential Center is built there.
The difference is there is solid ROCK down below what was wetland.
Even on Manhattan there are areas of landfill. All of Greenwich Village is landfill. This is why there are only 4 story buildings in this part of Manhattan. All the really tall buildings on the island are in Mid town OR downtown/Wall street area which is solid rock.
This San Francisco building was built on land fill with friction pilings that had been used in many other buildings in the same area. The friction pilings go down about 80 feet into the ground.
That is because they did not want to drill down to the rock that is 200 feet below the surface.
Didn’t a residential building collapse on the Florida coast recently?
Wait!!! I’ve been told countless times by people who are “smarter” than me that the whole world is gonna be under water in like 3.2 years. How is reclaimed land even possible?? /s
Yes, but for another reason. Salt water intrusion into the reinforced concrete weakened the structure by corroding the steel rebar............
Investigations into 2021 Surfside condo collapse far from over
It’s built on fill. The piles installed during construction were inadequate (friction piles I believe). The repair included many piles to bedrock and that process was started. Then political infighting began between contractors and engineers. The fix was halted, then resumed under far less ambitious conditions and the tilting continued. The building is doomed IMHO.
The movie is hilarious, I really enjoyed it. .
Mr Blandings Builds His Dream House - If You Ain't Eating Wham
Domino — it ain’t just a theory.
I don’t know why they keep d!ck!ng around with this. The only way I can see this tilting tower thing getting resolved is if Elon Musk & Donald Trump put their heads together.
And even that seems like a risky prospect.
Partly it’s the city’s fault. The builders however counted on the city not doing something stupid, and did something stupid themselves — they didn’t drill down to bedrock during the foundation phase of construction.
An engineer known for fixing stuff like this was consulted, he told them they needed to shore it up from the deep center of the foundation, but that was much more expensive, so they did what he warned them not to do, and tried shoring it up from outer edges at street level. The tilt got worse.
Give or take a quake (for which SF is best known), the building will come down, uncontrolled, and on its own schedule, and will damage and perhaps tip one or more neighboring buildings. It needs to be evac’d and dismantled (probably can’t be imploded due to proximity of other highrises) while there is still time.
My guess is, it won’t be.
Image from sept 2022, it sez here:
https://www.google.com/maps/place/37%C2%B047‘25.4%22N+122%C2%B023’46.0%22W/@37.7913969,-122.4009917,15.5z/data=!4m5!3m4!1s0x0:0xb90ae474980b9954!8m2!3d37.7904!4d-122.3961?hl=en
New problem at San Francisco’s still-sinking Millennium Tower means it may be forever tilting
Andrew Chamings
SFGATE
May 17, 2022
https://www.sfgate.com/local/article/new-problem-at-SF-sinking-tower-17179301.php
At 80 I remember stuff....but sometimes its fragmented.
Need a brain de-frag
Good news... no plack nor lesions detected in a recent MRI scan.
Glad to hear the good news, we need experienced FReepers.
Tear er down
https://www.youtube.com/watch?v=fk-gE6fnDic
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