Follow up more info about additional leaning. Evidently after doing one mitigation step contractors waited 4 days when to wait to do next step could have been done immediately. Is Caltrain, CA HSR, and maybe Amtrak ever going to be able to use the new train station?
ore leaningbut only 1"
The building is not built on fill. The bottom of the fill is 20’ down at that location. The bottom of the foundation slab is 25’ down. They had to remove all the fill and dig down an additional 5’ for the foundation. It’s the “glup” below that’s causing problems.
That the writer of the above story made that mistake causes me to doubt the qualifications of that writer to, uh, write.
As of June 7, the lateral roof deflection is about 27". The foundation (and each floor above) has a slope of about 2.4" in 181’.
Ed
The explanation I heard last summer in SF about Amtrak (buses) not using the terminal has more to do with the rent being charged than anything else, including the precipitous leaning.
Waiting outside on the street in any weather for the Amtrak bus, or being dropped off by it on the street, has been part of the SF Amtrak experience for decades and is a reproach to both the City and the railroad.
Errors like this can and do happen to the best of them. When Japan built Kansai International, it was sinking at 150% percent of the expected settling rate. This wasn’t a couple inches either, but it overshot the settling rate and protected distance above sea level decades ahead of schedule and sank nine more feet that it was supposed to. The whole dang airport had to be jacked up.
A look from a year ago
The building is 1 in 300 off of vertical, but the floors are only 1 in 900 off of horizontal?
I am reporting numbers from the following source (Report 109, in particular):
https://sf.gov/resource/2022/monitoring-reports-about-millennium-tower-retrofit
Lateral roof deflection from page 5, foundation slope from page 4.
Ed
Thanks for that link – I hadn’t seen that. Looks like what you read as “foundation slope” is actually the increase in slope since May 2021. So the building is something over 1 in 300 off of vertical, and the floors are probably? about the same off of horizontal. (Dunno how warped the building can get.)
I hadn’t noticed that note about “since May 2021”. I thought it was true slope–my mistake.
I don’t think the building can warp enough to notice. If it did, there’d be cracks everywhere. There ARE problems in the parking garage.
Since the building is about 28% wide as it is high, and the tilt is about 27" I’ll assume the slope of the “floor” is about 7 1/2 " overall.
Ed
Don’t set a ball down on the floor and expect it to remain in the spot where you placed it.
Yeah. I’ve noticed that in my kitchen.
Ed
Which raises the question: what does “building” mean? Far as we can tell, the low building next to the tower is part of, or at least attached to the tower.
https://goo.gl/maps/t6TJJHKpnj6bMNHf9
And for all we know, maybe the next structure to the NE as well.
building: a structure with a roof and walls meant for long-term use
Neither the “…low building next to the tower…”, nor the “…structure to the NE…” is a part of the Millennium Tower, as they do not show on the construction plans for same.
They are also on separate lots with different addresses.
Ed
If square and plumb don’t mean anything - set golf ball or similar hard surface ball on a hard surface floor and see if it stays where it is place.