Based on further structural analysis and the success of a pilot program that installed three permanent piles using modified procedures, the structural engineer-of-record for the delayed perimeter pile upgrade of the 645-ft-tall Millennium Tower in San Francisco has proposed a significantly reduced scope for the project that he says would still arrest settlement and allow the slow recovery of some of the condominium building’s tilt.
The new scheme would enable Shimmick Construction to complete the pile work early in 2022 and allow the jacking of the loads off the existing foundation before the end of 2022, says Ronald O. Hamburger, the engineer for the $100-million foundation upgrade and a senior principal with Simpson Gumpertz & Heger.