The people of SF & SF Government are let off the hook quite nicely. The headline of the SFist article, posted by Jay, is misleading, as most of the $30 million, ascribed to SF Taxpayers will be borne by US, State and Bay Area Taxpayers, including $1 dollar from every vehicle that crosses the SF-Oak Bay Bridge, ticket fares from CalTrain riders & Alameda-Contra Costa bus riders. I think the fun really begins when they remove the CDSM shoring wall on Fremont & Mission St and the Play-Doh starts production. It would require a sustained, high magnitude earthquake to mobilize the QYBM. The mat foundation sits on young bay mud, below the non-engineered fill layer, which is from 17 to 42 feet thick, across the whole of the site. until it does, is there a chance for a seismic event to liquefy the soil beneath the building? RE: SF Tower settlement Part II hokie66 (Structural) 1 Dec 20 22:05 Of course the SF Dept of Building Inspection has been very vigilant of this process, not wanting to be found lacking, as they were from the start. These last three have been a bit of a terror for the HOA & Millennium Partners, as they must be Handicap Accessible. So the patio, the indoor pool level and basement/garage access. (photo) and the access points on 3 levels between the tower and the podium structure. The only entry/exit points affected are the lobby entrance on Mission St. Serendipitously, the mat foundation extends beyond the only entry/exit affected by the sinking.Ĭorrection: The sinking of 18" & tilting of 14" are from 2018, which according to another article from July 2020, was the last time these factors were made public. The powers that be, likened the slowing of the sinking to the secession of work on the White Elephant (TJPA) next door.
So about 2 inches since the fall of 2016, if I recall correctly. The work is conditioned on real time settlement monitoring, the supervision of a drilling expert, and a requirement that work stop if the tower settles more than a quarter of an inch at the northwest corner.In July the press reported the tower had sunk a total of 18 inches and was tilting 14 inches. “Our position is based on the minimal overall settlement and tilt produced by the 36-inch pilot casing” test, O’Riordan told homeowners in a letter Wednesday.
#Millennium tower tilts quarter four days install
The now approved alternative is to push forward and install five casings along Mission Street, according to a letter by the acting head of the DBI, Patrick O’Riordan. But the equipment to do that work is not available, so Hamburger sought permission to install more casings. The plan had called for a second phase of installing a pile down to bedrock. “It troubles me that the design team still doesn’t understand the causes of the sinking and tilting.” “The settlement and tilting resulting from any operation is not instantaneous, it develops over time,” he said. In his view, the data showed the modifications were not as effective as Hamburger had concluded. Robert Pyke, a veteran geotechnical engineer, said one weeks’ worth of data is far more indicative of what is going on than two days. The weekly rate also approached the level of sinking and tilting that had been occurring during the earlier pile installation over the summer, data shows. That level was just under the maximum tilt that would have been allowed to happen during the test itself. Fix designer Ron Hamburger declared it “successful” soon after the test was done, citing real-time data showing settlement of about one hundredth of an inch over the two day test.ĭata for the entire week, however, reflected settlement of 1/20th of an inch, with a lean of a quarter of an inch west toward Fremont Street. Sign up for NBC Bay Area’s Housing Deconstructed newsletter.Ī first key test involved installing a single three-foot-wide, 100-foot-long casing at the northwest corner of the building, where it’s tilting and sinking the most. Get a weekly recap of the latest San Francisco Bay Area housing news.
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