SF tower settlement 25

[hokie66]

Wouldn't want to be involved in this one.

http://www.sfchronicle.com/bayarea/article/SF-s-landmark-tower-for-rich-and-famous-is-8896563.php

 

[itsmoked]

That has got to be a "worst nightmare" scenario starting up.

I sure wouldn't want to be in a building like that during the soon-to-happen next Big One.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[dik]

Good thing it's not too tall... only 58 stories... Settled 16" so far and tilted 2". Constructed on mud fill with a slab foundations supported on piles into dense sand.

Max condo value is $10M...

I don't know if the sand is saturated, but, there could also be problems during a seismic event...

Dik

 

[TehMightyEngineer]

Well, this will be quite the case study on foundation improvements assuming they don't just demo it and start over.

Professional and Structural Engineer (ME, NH, MA)
American Concrete Industries

http://www.americanconcrete.com

 

[jayrod12]

For those that don't want to sign up as a member of the SF chronicle. Here's a fox "news" article posted by Tigerguy in the foundation forum

Link

 

[JAE]

The HOA added that it is exploring its legal option and could pursue damages from several parties, including the developer, the original design professionals, the original contractors and the Transbay Joint Powers Authority.

Trouble in paradise that's for sure.

Check out Eng-Tips Forum's Policies here:
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[BUGGAR]

I worked on the BART station construction one block away on Market. During lunch, a group of Archeologists would poke around the excavation and found all the stuff that was dumped from ships moored in the Bay before this area was filled. Lots of those clay pots, apparently used to ship rice, and many small bottles, some still sealed and full. Also met my wife there.

But I had nothing to do with this settlement.

 

[Lomarandil]

The transit authority also said the high-rise is made of concrete rather than steel, "resulting in a very heavy building. This heavy structure rests on layers of soft, compressible soil. The foundation of the Tower, however, consists only of a concrete slab supported by short piles that fail to reach the bedrock below. That foundation is inadequate to prevent settlement of a building with the weight of the Tower."

That's a pretty strong statement for the transit authority to make...

Time to grab some popcorn.

 

[IRstuff]

Various places in that part of the city is soft landfill; they used to find ships and whatnot when digging foundations for various buildings. Near as I can tell, that particular high rise is sitting on what used to be Yerba Buena Cove:

http://www.davidrumsey.com/luna/ser...st_No_InitialSort;lc:RUMSEY~8~1&mi=0&trs=2418

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529

 

[JStephen]

"and has sunk 16 inches and shifted 2 inches to the northwest since opening"- That's from the Fox news article, doesn't say it tilted, but moved sideways?
I suspect a lot of lawyers will make a lot of money out of this and that's about the only positive aspect all the way around.

 

[WinelandV]

I suspect a lot of lawyers will make a lot of money out of this and that's about the only positive aspect all the way around

I guess if you consider such a thing a positive...

 

[BUGGAR]

Been reading about the engineers and such involved with Flint.
I was a concrete inspector on the BART Lower Market Street Station. I inspected the concrete used in the slurry walls on the south side of Market, 720 feet away from 301 Mission. As I mentioned, I met my wife here. Suppose I was watching her instead of the concrete pour. And as a result, after 45 years of seepage from bad concrete, the millenials had their building damaged?

 

[IRstuff]

title of chronicle article "SF’s landmark tower for rich and famous is sinking and tilting"

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529

 

[SwinnyGG]

Been reading about the engineers and such involved with Flint.
I was a concrete inspector on the BART Lower Market Street Station. I inspected the concrete used in the slurry walls on the south side of Market, 720 feet away from 301 Mission. As I mentioned, I met my wife here. Suppose I was watching her instead of the concrete pour. And as a result, after 45 years of seepage from bad concrete, the millenials had their building damaged?

Well, in your case, let's hope the statute of limitations for arousal-induced negligence has expired.

 

[itsmoked]

Likely tilting because of all the compressing beer cans tossed in the hole by BUGGAR and his cohorts.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[Ingenuity]

My guess is that the legal settlement may take longer than the ongoing foundation settlement...

 

[BUGGAR]

"Founded on piles bearing on dense sand". There was a drainage system built to collect leakage from the slurry walls around the Lower Market Street Station. What if these dense (previously) sands have been draining through the slurry walls and into the Market Street Station dewatering system and no one knows this?

I'm not really trying for some witness per diem, honest.

 

[waross]

It will have to tilt a lot more than 2 inches before it becomes a major tourist attraction. It will be some time yet before the Italians become concerned about losing tourist dollars to SF.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[BUGGAR]

The Transbay Transit Center is 90% over budget and considering a special tax on the properties, including 301 Mission, to pay for the bail out. This is just for Phase I of the Project. Funding for Phase II has not been identified. Phase III??

Excavation is just like BART - cut and cover using soldier piles and concrete slurry walls. Big HSS struts supporting walls during excavation. The excavation is bigger than Lower Market. I presume the walls are structural like on BART, a first at the time. I also read that they consider the Lower Market Street Bart Station to be obsolete. Hey, I just built that thing! The concrete is just reaching its prime.

 

[msquared48]

A new icon to advertise for tourists for the local money mongerers - The Leaning Tower of San Francisco - And Vegas can take bets as to when it will fall too.

Many investment opportunities here...

Mike McCann, PE, SE (WA)