Dva zanimljiva primera koja pokazuju da čak i danas dešavaju ogromne greške kad je u pitanju procena zemljišta na kome se gradi. Zanimljivo je da se oba odnose na zgrade blizu vode.
Ovaj prvi u Kini ste verovatno već videli.
Drugi je zanimljiviji zato što se dešava u Americi koju, za razliku od Kine, niko ne može da optuži za nedostatak tehničkog znanja, iskustva, standarda ili nadzora. Imamo i pomalo šaljivu koincidenciju dva Milenijuma, Ovaj kod nas izvodi radove, a u Americi se baš tako zove kula koja tone :lol:
San Francisco's 58-story Millennium Tower is upscale, but literally sinking fast
http://www.msn.com/en-us/news/us/san-fr ... li=BBnb7Kz
A 58-story skyscraper in San Francisco is sinking and people are fighting over whose fault it is
http://www.businessinsider.com/why-is-m ... ing-2016-9
Par delova iz prve reportaže, sa boldovanim paralelama sa našom situacijom kod kule:
"Identification was checked at the door. Residents were told that what they were to hear must be kept a secret. A lawyer introduced a structural engineer who delivered, as Buttery and others recall, a simple statement that startled the packed room:
"The Millennium building is too heavy for its foundation."
Not only had the tower settled by far more than the 4 to 6 inches originally forecast for the life of the building but, "most importantly," recalled Jerry Dodson, a retired patent lawyer and a vocal critic of the tower's builders, the engineer said "it wasn't stopping."
Dodson has since heard estimates that the building could sink anywhere from 30 to 48 inches, "but nobody really knows."
The tower was being
erected on landfill that previously was part of the bay — like much of the eastern flank of the San Francisco Peninsula, and as a prospective buyer, Pretlow took hardhat tours of the building in progress, asking what she thought were all the right questions about the construction quality and safety.
"I felt anger. I felt that I had been duped," Pretlow said. "And I also had a feeling that I should have got out a year ago. I felt, I am stuck, how many years longer am I going to be stuck in this building?"
Dodson and several other condo owners in the tower blame Millennium Partners, the tower builders, for not driving foundational piles 200 feet to bedrock, as was done with a 61-story skyscraper going up across the street. Instead, the builders relied on a concrete foundation attached to
piles that were sunk into firmly compacted sand and mud about 60 to 90 feet below.
Such foundations are not uncommon in San Francisco, even on land fill — although many of the buildings so anchored are constructed with lighter, steel frames.
Millennium Partners, in turn, blames a massive construction project underway adjacent to the tower.
In preparing to build a multi-agency transit center for rail and bus, the tower builders maintain, the Transbay Joint Powers Authority
has lowered the underground water table beneath the tower, causing settlement.
Millennium Partners and the Transbay authority disagree with equal vigor.
The sinking, though, has taken its toll. Geng and others speak of sleep interrupted by worry, panicky thoughts about earthquakes, red tags from building inspectors and the prospect of remaining stuck in a real estate abyss.
They circulate photos of the many cracks visible in the basement's concrete walls, and wonder what they might portend. Some feel themselves tense up after they return to the tower after a few days away.
And while safe for occupancy now, there are concerns among some residents about potential threats to the tower's high-speed elevators and sewer connections should the sinking continue — or should a significant seismic event occur.
"The building could go from safe to unsafe in a day," said Dodson, who lives with his wife, Pat, on the 47th floor.
The situation has created factions within the vertical neighborhood. There are those who would have preferred quiet negotiations with Millennium Partners, rather than endless media coverage. And there are those who want to take on the big players — Millennium Partners, the Transbay authority, both — legal guns ablaze.
"Friendships we had have been broken by this," Dodson said, "and other friendships we didn't have before have been born."
While one unit has sold since the sinking went public, the buyer was someone who already owned in the building. And most condo owners fear their units would fetch prices far below what they paid.
Buttery, who bought her high-ceilinged condo for $3.5 million, was one of scores of tower residents who have made their way to the tax assessor's office, seeking to re-adjust the appraised worth of their units.
Filling out the assessment form, she put down that her unit should now be valued at zero.
"The clerk said, 'You can't put down just zero."
"I said, 'OK.'
"
And I put down one dollar."
....
The email arrived at 2:53 a.m.
One more sleepless night in the sinking tower."