Deep Basement Construction Requires Specialty Knowledge
Development in downtown San Francisco continues with taller structures and deeper more complicated basement excavations. Tight urban sites in the city pose several challenges ranging from existing underground utilities, adjacent structures and difficult geotechnical conditions.
Situated a block away from the new Salesforce Terminal at the intersection of First and Mission Streets in San Francisco, the Oceanwide Center is a mixed-use project with two high rise towers. The First Street Tower will be a 910-foot tall, 61-story residential and office building with a 4 story basement. The Mission Street Tower will be a 54-story, 605-foot tall building with a 3 story basement that will house a Waldorf Astoria Hotel and residential units.
Malcolm Drilling Company was retained by the Swinerton/Webcor Joint Venture to install the deep foundations and temporary support of excavation system and perform the mass excavation on this $1.6B project. Working for Malcolm, Brierley Associates designed the temporary excavation support and work trestles. The support system for the excavation that exceeds 70 feet in depth consists of a perimeter cutter soil mix (CSM) shoring/groundwater cutoff wall with four levels of preloaded internal bracing.
You can learn more about our client Malcolm Drilling and this project by clicking here