imaudigger, post: 402032, member: 7286 wrote: I'm surprised that nobody else noticed that the story stated that satellite images have confirmed that the building had settled .13' in 12 months.
If we can determine elevations on earth within .13' from images captured in space....why the heck don't we have much better national elevation grids?
I'm thinking the press got it wrong again.
That's why I posted this. I tought that was hilarious.
Bradl, post: 402042, member: 2848 wrote: This issue is that this building is all concrete, while the other buildings are steel framed. This greatly contributed to the vertical loads, that while known, impacted the consolidated sand layer so much more.
I completely missed that, and thank you for the info.
I am completely in awe as to why a building of that magnitude, especially constructed of concrete in a fault line, would not be supported by piles (lots of Û÷em) driven to bedrock. :drool:
James Fleming, post: 402050, member: 136 wrote: https://pubs.usgs.gov/fs/2005/3025/2005-3025.pdf
Thanks. Interesting and easy to read article. Sounds like we need to shift NASA's emphasis from mending relations with a certain group of people to building and launching some L-Band Birds.
paden cash, post: 383986, member: 20 wrote: Sticking a garden hose under the floor - $1.00
You mean in OkieHomie, you can buy a garden hose for $1.00?? Y'all still have pay phones, "corner stores" that will cash a small personal check, and drive-in movies? If ya do buddy, let me know cause I'll be headed that way! 😉 ooh, and Nehi sodas.
[USER=11785]@SPMPLS[/USER] : Where did you procure that magnificient head piece. I wan't one for driving to work on I-4 (if I absolutely HAVE to) during rush hour in case of the upcoming solar flares. (and to freak people out)
makerofmaps, post: 402054, member: 9079 wrote: That's why I posted this. I tought that was hilarious.
Then you misunderstood it. Please see my post #16 that explains that they are talking about relative change, not absolute elevations, and yes, detecting a 0.13' change, especially on a hard surface from satellite collected data is very possible. Please go to the link Mr. Fleming provided to learn more about InSAR.
paden cash, post: 383939, member: 20 wrote: That's what happens when you build a structure and fill it with attorneys.
I worked for a GC back in the day that had built a six story library at a local university. After a year the floors were sinking in the middle and pulling away from the walls. The university sued anybody that had ever touched the place.
After a review of the original contract it was discovered the university had only specified a standard loading, similar to an office building. Huge shelves of books apparently weigh a little more than usual. The architect and the GC were cleared in the suit. A structural consultant was hired to come up with a fix. After a couple of hundred thousand dollars the recommended fix was "should have put more steel in it when it was built".
It is an administration building today.
BS weighs less than books? :dizzy:
paden cash, post: 402031, member: 20 wrote: From the article: "He reiterated the developers' blame for the tower's problems on the city's construction of an adjacent railway station, which they say removed ground water from beneath the Millennium Tower that caused it to sink and tilt."
That's always an important first step in keeping a multi-story structure from falling over; hire a butt load of attorneys to start slinging fresh baked culpability in every direction.
When they asked John Dillinger why he robbed banks, he said, "Because that's where the money is."
How do you fix it? That will make an interesting article to read.
Looks like it isn't the only building that is sinking.
How do they handle the entrance steps and UG utilities when a structure settles 16"?
PS: What a slap in the face for NASA to have the Europeans doing this kind of work instead of them. At least is wasn't the Chinese National Space Agency...
imaudigger, post: 402078, member: 7286 wrote: How do you fix it? That will make an interesting article to read.
The likely fix is called InSitu Soil Stabilization using Jet Grout. InSitu means mix in place. They drill 4" dia hole though the foundation or footers, then pump jet grout under the building that will create 36"-60" dia column of concrete. We recently used this procedure on a long concrete tunnel for miles of wire from Nasa Rocket testing platform to the control center at John C. Stennis Space Center. The underground tunnel was also subsiding in the sand, like this building is.
The problem with this procedure, very messy. High pressure liquid tends to finds it way out somewhere. Very expense. When it comes down to $$, it is often the cheapest route.
leegreen, post: 402081, member: 2332 wrote: The likely fix is called InSitu Soil Stabilization using Jet Grout. InSitu means mix in place. They drill 4" dia hole though the foundation or footers, then pump jet grout under the building that will create 36"-60" dia column of concrete. We recently used this procedure on a long concrete tunnel for miles of wire from Nasa Rocket testing platform to the control center at John C. Stennis Space Center. The underground tunnel was also subsiding in the sand, like this building is.
The problem with this procedure, very messy. High pressure liquid tends to finds it way out somewhere. Very expense. When it comes down to $$, it is often the cheapest route.
Something tells me that would only be a short term fix.
They make an ISS 90ft deep, that should help.
wfwenzel, post: 402066, member: 7180 wrote: BS weighs less than books? :dizzy:
Yup - its mostly hot air!
In South Louisiana, I have seen where the depletion of the water table caused structural/foundation damage.
For instance, bigger pumping stations were built..leading to larger drainage canals with deeper depths that damaged slab homes foundations.
Parish had to regulate the water depths to stop further damage.
But in this SF case, it looks like a big blunder in the foundation design.
Live and learn
'In court papers and as reported last month by NBC Bay Area, the latest data shows the tower has tilted about 2.5" west to the Salesforce skyscraper since January.'
The Gulf Building in Houston, Texas has been sinking since it was constructed and HP&L has been constantly monitoring that movement.
Have not heard any update since 1974 until I found this article 5min ago:
The San Joaquin Valley is subsiding very fast too due to groundwater pumping which is unregulated in California.
I worked for an engineering company for a while and did a ton of commercial projects. I asked an engineer there once why we didn't do more residential stuff and he said it's because if anything happens to go wrong by anyone, on a multi story condo for example, you get dragged into a lawsuit by 150 different owners and it's a mess. Which sounds like precisely what's going on with this tower.
