![]() RELATED: Could a building collapse like Florida happen in SF? UC Berkeley professor weighs in The tower at Mission and Fremont has been the center of controversy since May of 2016 when residents there were informed that the main tower was sinking.Ĭonstruction work to fix the problem had just started up and now comes confirmation that it sank another inch. SAN FRANCISCO (KGO) - The 58-story Millennium Tower in San Francisco is sinking again. “They have been proactive and responsive in addressing the increased foundation settlement by engaging with the contractor and (the homeowners association) and being responsive to our inquiries.Building representatives say the construction work at San Francisco's Millennium Tower has been halted due to another inch of sinking. Yet as of July 30, Deierlein and his panel expressed “full confidence” in the fix team’s “ability to address this challenge,” according to his summary of findings of a review panel meeting on the issue. “The way to solve the problem, as I see it, is not to continue going on the route that is showing you the wrong route, but to recoup, reconfigure the solution and do something that has a better chance of working.” “The question is how do you solve the problem,” Kardon said. One project critic, Berkeley-based structural engineer Joshua Kardon, says the dramatic settlement shows the fix approach is a failure. That prompted the board to put all pile installation on hold as of Monday.ĭata released by the city on Monday shows the tower is currently leaning 22 inches towards Fremont Street – compared to 17 inches when work began. Despite the pause, the building had settled another half inch – possibly due to soil being displaced during installation of the 24-inch piles. Soon, crews refocused on sinking 24-inch diameter piles along Fremont Street.īut by mid-August, it was apparent from the data that the problem was more complex than fix engineers had hoped. The next day, on July 30, the homeowners association board agreed to put a two-to-four-week hold on shaft drilling work, documents show.īut by that time, 39 shafts had already been installed. “We are bringing this to your attention as a point … to be aware of and perhaps raise with the 301 Mission Street building owners,” Deierlein told building inspection officials.Īn engineer working on the Millennium Tower in San Francisco is trying to ease concerns about a similar situation to the Florida condo collapse happening in the Bay Area.Īs NBC Bay Area’s Investigative Unit has reported, the tower has sunk 18 inches over the past 10 years. He wrote on July 29, warning that despite Hamburger’s proposal, fix work was continuing “unabated.’’ One mentioned by Stanford professor Greg Deierlein – the head of the city’s review panel – in a communication with city officials. The plan called for those piles to be inserted in existing shafts during the partial work stop.īut there was a hitch. If the sinking subsided when shaft drilling was halted, Hamburger theorized to city officials, that could help prove a theory that drilling of the shafts was compressing and de-stabilizing the soil near the existing foundation.Īs he supported stopping shaft installation, Hamburger downplayed the likelihood the chances that the longer, 24-inch diameter piles, were the culprit. The shaft installation was the suspected cause of the new settlement. ![]() The plan calls for attaching a newly bedrock-supported foundation built atop those piles to the old, sinking foundation. Inside those shafts, crews sink smaller diameter piles down to bedrock. The holes are lined with steel tubular shafts that set the stage for the key part of the fix. Still, Hamburger endorsed a plan to stop drilling three foot wide holes on Mission Street. ![]() Still Sinking: Construction Halted at SF's Millennium Tower
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