> Pricey retrofit proposed for sinking Millennium Tower in SF

Pages: 1

........................................................................

Phillip_McCavity
#1 2018-04-16 21:19:53

Pricey retrofit proposed for sinking Millennium Tower in SF

According to a geotech acquaintance of mine, micropiles are the correct solution here. He told me this about 2 months ago when I asked. Now we get an article...

https://www.sfchronicle.com/bayarea/mat … 833795.php

Engineers have proposed an unconventional solution to the Millennium Tower’s tilting troubles: drilling piles down to
bedrock to stabilize one side of the 58-story condo high-rise and then letting the other side continue to sink until the building straightens itself.

“The engineers are very confident this is going to stabilize the building,” said Vision Winter, a partner at O’Melveny & Myers, the law firm hired by the homeowners association to obtain funding for the building’s mega-repair.

But it won’t come cheap.

Experts estimate the job could cost from $200 million to $500 million — in other words, probably as much as the $350 million it cost to build the tower in the first place.

........................................................................

Avid Paddler
#2 2018-04-16 21:24:54

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Silly question, why didn't they do this in the first place? What about the buildings around it?

........................................................................

.,
#3 2018-04-16 21:39:58

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Phillip_McCavity wrote:

According to a geotech acquaintance of mine, micropiles are the correct solution here. He told me this about 2 months ago when I asked. Now we get an article...

https://www.sfchronicle.com/bayarea/mat … 833795.php

Engineers have proposed an unconventional solution to the Millennium Tower’s tilting troubles: drilling piles down to
bedrock to stabilize one side of the 58-story condo high-rise and then letting the other side continue to sink until the building straightens itself.

“The engineers are very confident this is going to stabilize the building,” said Vision Winter, a partner at O’Melveny & Myers, the law firm hired by the homeowners association to obtain funding for the building’s mega-repair.

But it won’t come cheap.

Experts estimate the job could cost from $200 million to $500 million — in other words, probably as much as the $350 million it cost to build the tower in the first place.

in other words ->

........................................................................

Phillip_McCavity
#4 2018-04-16 22:12:10

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Avid Paddler wrote:

Silly question, why didn't they do this in the first place? What about the buildings around it?

Some have pilings to bedrock, but some don't, even some pretty large ones.

Nobody (who can talk) knows why they made the decision int he first place, but it is most likely that it was funded during the recession and they might not have been able to complete the building on pilings.

........................................................................

Diarrhetrius Brown
#5 2018-04-17 00:34:10

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

........................................................................

Diarrhetrius Brown
#6 2018-04-17 00:37:05

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

And what happens if SF gets a nice strong earthquake?

........................................................................

Diarrhetrius Brown
#7 2018-04-17 00:37:55

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

If SF gets hit with an 8.0 Phil is probably in the safest place.

........................................................................

Caitlyn Dolezal
#8 2018-04-17 07:50:29

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Avid Paddler wrote:

Silly question, why didn't they do this in the first place? What about the buildings around it?

Presumably because it would have cost too much, although it seems like a bad decision now.  I have to admit that I'm a little surprised they could find an engineer who was willing to sign of on a plan that had a 58 story building sitting on friction piles driven into landfill.

........................................................................

Avid Paddler
#9 2018-04-17 12:57:57

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Caitlyn Dolezal wrote:

Presumably because it would have cost too much, although it seems like a bad decision now.  I have to admit that I'm a little surprised they could find an engineer who was willing to sign of on a plan that had a 58 story building sitting on friction piles driven into landfill.

I kinda knew the answer already. I would hope the engineer that signed off on the plans has a bond/insurance to cover repairs. I would think anchoring a build that size to bedrock would be a no brainer in an earthquake zone. According to Wikipedia it's the tallest(heaviest) building in the area.

I have 25 years of experience in building in earthquake zones.
\

........................................................................

Tom Leykis
#10 2018-04-17 13:12:28

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Avid Paddler wrote:

I kinda knew the answer already. I would hope the engineer that signed off on the plans has a bond/insurance to cover repairs. I would think anchoring a build that size to bedrock would be a no brainer in an earthquake zone. According to Wikipedia it's the tallest(heaviest) building in the area.

I have 25 years of experience in building in earthquake zones.
\

  25 years of experience in building in earthquake zones, means you MISSED the 1989 Loma Preita earthquake.

........................................................................

.,
#11 2018-04-17 14:42:31

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Tom Leykis wrote:

  25 years of experience in building in earthquake zones, means you MISSED the 1989 Loma Preita earthquake.

I have corrected my resume to reflect 27 years experience.
\

........................................................................

Tom Leykis
#12 2018-04-17 15:00:10

Re: Pricey retrofit proposed for sinking Millennium Tower in SF

Diarrhetrius Brown wrote:

And what happens if SF gets a nice strong earthquake?

At best, Millennium Tower gets several new stories of underground parking.

........................................................................

Pages: 1