SF Tower settlement Part II 18

[1503-44]

"Appreciation has dropped to 2%"
Well that's less than inflation, but more than interest rates.

Although as I said, probably nobody bought in for either of those reasons.

“What I told you was true ... from a certain point of view.” - Obi-Wan Kenobi, "Return of the Jedi"

 

[epoxybot]

Powerpoit/PDF presentation "The Millennium TowerSettlement, Tilting and Upgrade"
by Ronald O. Hamburger, S.E., SECB of Simpson, Gumpertz & Heger.
University of Kansas 5, March 2020
Link

 

[BrianGar]

This is a silly question, but if it has sunk 16" how are all the entrance doors still working or if the entrance doors and thresholds are also sinking with the foundations - surely there would be a very noticeable ramp/step down into building?

Explain!

Brian,

 

[MacGyverS2000]

I would imagine the building isn't slipping into the Earth like a peg in a hole... there has to be some form of slumping along the edges. Maybe not enough to completely eliminate a threshold tripping point, but surely the surrounding sidewalk is tilting somewhat.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[dik]

There's serious damage to the sidewalks around the building.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[Phil1934]

I would like to see settlement and tilt info newer than 3 years old. Retrofit piling was supposed to start in November but no news on that. I wonder if delays will allow the project to pass the fix-it stage.

 

[epoxybot]

In July the press reported the tower had sunk a total of 18 inches and was tilting 14 inches. So about 2 inches since the fall of 2016, if I recall correctly. The powers that be, likened the slowing of the sinking to the secession of work on the White Elephant (TJPA) next door.
Serendipitously, the mat foundation extends beyond the only entry/exit affected by the sinking.

Correction: The sinking of 18" & tilting of 14" are from 2018, which according to another article from July 2020, was the last time these factors were made public.

The only entry/exit points affected are the lobby entrance on Mission St. (photo) and the access points on 3 levels between the tower and the podium structure. So the patio, the indoor pool level and basement/garage access. These last three have been a bit of a terror for the HOA & Millennium Partners, as they must be Handicap Accessible. Of course the SF Dept of Building Inspection has been very vigilant of this process, not wanting to be found lacking, as they were from the start.

 

[hokie66]

So does the surface drainage still work? Does water run back into the building?

 

[epoxybot]

There have been modifications made since to the entry. The entry from the planter to the doorway has been replaced.

 

[dik]

Nice Hamburger report... did they start the remediation on May 1 of this year? It's nice to have loading going down to bedrock... until it does, is there a chance for a seismic event to liquify the soil beneath the building? There seems to be no mention of what will happen if they just leave it and don't repair... no prolonged time sensitive curves showing the increased settlement and/or tilt.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[JayMaechtlen]

https://sfist.com/2020/10/21/sf-tax...ion-to-shore-up-the-sinking-millennium-tower/

SF Taxpayers On the Hook For $30 Million to Shore Up the Sinking Millennium Tower

Jay Maechtlen

http://www.laserpubs.com/techcomm

 

[dik]

Thanks... I'd wait until the problem was fixed before signing off on anything... what if the repair is never undertaken or if it doesn't work?

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[epoxybot]

... until it does, is there a chance for a seismic event to liquefy the soil beneath the building?

The mat foundation sits on young bay mud, below the non-engineered fill layer, which is from 17 to 42 feet thick, across the whole of the site. It would require a sustained, high magnitude earthquake to mobilize the QYBM.
I think the fun really begins when they remove the CDSM shoring wall on Fremont & Mission St and the Play-Doh starts production.

The headline of the SFist article, posted by Jay, is misleading, as most of the $30 million, ascribed to SF Taxpayers will be borne by US, State and Bay Area Taxpayers, including $1 dollar from every vehicle that crosses the SF-Oak Bay Bridge, ticket fares from CalTrain riders & Alameda-Contra Costa bus riders.

The people of SF & SF Government are let off the hook quite nicely. SF Govt's contribution to settling the Millennium Tower litigation was waiving the $3.10/sf/yr sub-sidewalk rental fee for the long-term right of the Millennium HOA to make incursions into the public right of way (Below Sidewalk). About $8500/year.

 

[epoxybot]

Screen grab captured from a YouTube video Dec. 10m by a package delivery guy who skateboards (Electric) around SF.
It looks like they are just getting started.

 

[dik]

thanks... I was thinking for the settlement to have occured so quickly that there must be a fair flow... maybe not.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[epoxybot]

I was thinking for the settlement to have occured so quickly that there must be a fair flow... maybe not

The tower settlement or the litigation settlement?

 

[dik]

they could both go on for decades...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[epoxybot]

From the SkyscraperPage Forum, a couple of photos from Feb. 8, 2021
Link

In these photos they are currently driving soldier pile & lagging shoring.

 

[JohnRBaker]

Now if they had just had this technology in Pisa back in the 12th century...

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[Tomfh]

What are the odds this’ll work?