View of Shaft 2 – sheet piles with 2 levels of internal bracing (Courtesy of Keller North America).
View of Shaft 3 – sheet piles with three levels of internal bracing. Photo also shows existing box culvert that shaft was constructed around (Courtesy of Keller North America).
View of Shaft 1 fully excavated – secant piles with 2 levels of internal bracing (Courtesy of Keller North America).
View of Shaft 3 – 3 levels of internal bracing (Courtesy of Keller North America).
Bronx River CSO
Engineering design for a SOE System in the Bronx.
GeoEngineers’ Construction Design team partnered with Keller North America to design a SOE system for the Bronx River CSO project in the Bronx, New York. The project involved construction of a new interceptor sewer line and three access shafts. GeoEngineers provided the engineering design for safe, efficient excavation and construction.
Approach
- Designed SOE for three new access shafts along the proposed interceptor at the Bronx River CSO project in Soundview Park, Bronx, New York.
- Shaft 1 (38 ft deep, 60×30 ft) utilized secant piles; Shafts 2 (47 ft deep, 35×27 ft) and 3 (38 ft deep, 30×25 ft) used sheet piles, each with two or three levels of internal bracing.
- Value-engineered shafts from original contract design to optimize construction efficiency and cost.
- Configured bracing to allow Tunnel Boring Machine (TBM) launch access.
- Performed detailed analysis of underlying clay layers and reconfigured shafts to avoid existing utilities.
- Developed unique bracing geometry for Shaft 3 to minimize excavation costs.
Results
GeoEngineers delivered complete design calculations and detailed construction drawings for the three access shafts, including plans, cross sections, bracing configurations, and material specifications. The value-engineered designs provided the contractor with clear guidance for safe, efficient excavation while accommodating TBM launch requirements and avoiding existing utilities. The engineered SOE solutions minimized construction costs and risks, ensuring successful installation of the interceptor sewer and associated structures along the Bronx River corridor.
