Keller provides groundwater control and excavation support solutions to facilitate ADA upgrades to NYC subway stations.
The project
Following updates to the Americans with Disabilities Act (ADA), New York City Transit was required to add two elevators to the existing subway station at the intersection of 14th Street and 6th Avenue.
Due to the constrained urban environment and limited headroom, micropiles were selected to provide excavation support for the elevator shaft. Keller installed the micropiles first, relocating some piles to avoid existing structures. Keller then performed jet grouting to provide a watertight “lagging” between the existing subway structure and the soil stratum.
Keller’s scope included:
- At Elevator 611: 37 jet grout columns, ranging from 12 ft to 30 ft deep and 11 micropiles up to 35 ft deep.
- At Elevator 612: 22 jet grout columns, ranging from 8 ft to 12 ft deep, and 17 micropiles up to 35 ft deep.
Project facts
Owner(s)
NYC Transit
Keller business unit(s)
Keller
Main contractor(s)
Citnalta-Forte JV
Engineer(s)
GFT