The 58-story, 645-foot tall tower is now tilting 26 inches north and west at Fremont and Mission Streets in the heart of San Francisco’s financial district.
. The tower sits beside the Salesforce Transit Center, a bus terminal and potential future rail terminus for California’s high speed rail network currently under construction.
A letter to the Millennium Tower’s general manager last month said the new, quicker fix was needed after engineers identified two potential causes for apparent worsening of the building’s settlement: “vibration of the soils associated with pile installation activity, and unintentional removal of excessive soil as the piles were installed.”
"We judge that the 18-pile solution offers an optimal solution between additional settlement and benefit gained."that an expert review of the perimeter pile upgrade plan found there was a one- to four-day-long delay in summer 2021 between excavating the soil for the existing six pilings and injecting grout to minimize soil collapse.
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