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The improvement to the existing 63rd Street Station for the Second Avenue Subway in Manhattan, New York involved the installation of drilled and grouted micropiles socketed into schist bedrock. The micropiles were required as foundations to support two new ancillary structures and a new subway station entrance. The micropiles were installed within existing basements in adjacent buildings under confined space conditions. Load tests were conducted on sacrificial test piles to 3 times the design load to verify assumptions for grout-rock interface bond resistance. Additionally, proof load tests to 1.5 times the design load were conducted on selected production piles to confirm workmanship compliance. This paper presents the design concept for the foundations, interpretation of the load test results, and highlights the drilling issues encountered as well as the unconventional load testing procedures that were adopted due to constraints of the site.
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