The Federal Reserve Building was adding a large generator and a new privacy wall on the back side of the building. Due to soft clay surface soils, a deep foundation was needed to support the weight of the new structures. Access, mobilization, and vibration concerns dictated that Atlantic Site Services, the installing contractor, utilize helical piles to overcome the site issues.
Project Summary:
- Helical Pile Type: 2 7/8″ w/.203 wall
- # of Helical Piles: 26
- Location: Washington, DC
- Installation Depth: 17′ to 21′
- Ultimate Pile Capacity: 40 Kip
- Equipment Used: 6K Drive head, Marian Torque Indicator, Small Kubota Excavator
- Challenge/Unique Aspect: Access was extremely limited. The excavator need to be lifted and dropped into the courtyard where the project took place. The material had to be walked in by hand to the very tight site. No vibration was permitted due to the proximity to the existing building.
- Engineer/Architect: ECS
- General Contractor: Wycliffe Enterprises
