Project at a Glance

• Client: DeFoe Corp.
• Owner: MTA Construction & Development; Triborough Bridge and Tunnel Authority
• Design Consultant: HNTB Corporation
• Location: Randall’s Island, NY
• Tri-State Scope of Work: Geotech (Piles)

Project Summary

The project includes the demolition of some existing ramps and the construction of two new vehicular ramps – Queens to Randall’s Island (QR) ramp and Randall’s Island to Manhattan (RM) ramp – and three new pedestrian ramps.

Tri-State Work Summary

Tri-State installed a total of 112 rock-socketed micropiles for both the QR ramp and RM ramp. We also successfully performed three verification tensile- and lateral-load tests. A tensile proof test was also performed at each of the ten piers for the ramps to substantiate the required capacities. 

One of the challenges includes meeting the tight construction schedule when Tri-State exceeded expectations to provide high production rates, successful proof tests and reports, and pile cutoffs to facilitate the directly-after pile-cap constructions.