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Millennium Tower retrofit: DBI, EDRT and independent experts debate 52‑pile plan vs. reduced 18‑pile proposal
Summary
At a lengthy GAO hearing, the project team, DBI and the EDRT defended a reduced 18‑pile perimeter retrofit plan after construction‑related over‑excavation and grout delays increased settlement and tilt; independent experts urged caution and broader review before approving the reduced scope.
Committee members on Feb. 6 received technical updates and contested analyses about the proposed perimeter‑pile underpinning for 301 Mission (Millennium Tower). The hearing featured the structural engineer of record, geotechnical leads, DBI’s permit staff, the Department of Building Inspection’s Engineering Design Review Team, and at least one independent critic.
Supervisor (Paskin) opened the item noting that the originally submitted perimeter plan included roughly 52 piles intended to bear into bedrock; presenters said that sequence and the contractor’s initial means and methods contributed to a period of accelerated settlement and tilt last summer. Ron Hamburger (structural engineer of record, Simpson Gumpertz & Heger) said the team instituted a voluntary moratorium on construction from Aug. 22 through Oct. 12, ran a pilot program (three 36‑inch casings and three 24‑inch piles) using revised techniques, and reported the pilot piles did not cause…
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