F5 Tower

Daniels Development Company
Seattle, Washington

F5 Tower
Hart Crowser provided geotechnical design and construction services for a 44-story development with up to nine levels of underground parking at Fifth and Columbia in downtown Seattle. Challenges of the project include the proximity of the BNSF railroad tunnel, tiebacks from nearby structures in the right of way of two adjacent streets, narrow right of ways with an excavation of up to approximately 100 feet deep, and underpinning to support a historic church. Numerical modeling of the excavation and shoring system was performed to estimate vertical and lateral deformations of the shoring system and supporting soil.