Manhattan West- North Tower
Location: New York, New York
Client: John Civetta and Sons
Project Dates: 2015 - 2016
Contract Value: $3.7 Million
Summary
- Drilled and installed 82 – 16” diameter rock anchors with design load of 922.5 tons.
- Anchors consisted of 3 thread bars in one drilled hole with lengths of 63’ and 83’.
- Utilized the largest solid bar capacity anchors in the world.
PROJECT OVERVIEW
Big River was brought on to this project by the foundation contractor to drill and install (82) sixteen-inch diameter rock anchors with design load of 922.5 tons. The anchors consisted of three thread bars in one drilled hole with lengths of 63′ and 83′. They were part of an overall foundation design to ensure the stability of a New York City high rise tower.
WHAT MADE THIS JOB COMPLEX
The location and geotechnical makeup of the site made the scope of work somewhat challenging. This project utilized the largest solid bar capacity anchors in the world installed inside rock trenches and from temporary platforms within tight areas during concurrent excavation. The rock had seams in some locations that continued to fill the hole, preventing installation of rock anchors in those specific areas.
HOW WE SOLVED IT
Big River engineered temporary platforms, casing extensions to platform elevation, and spoils diverters to allow rig to drill at each location and reduce spoils. After several attempts to flush out the seam in the rock and grout the void, the hole was grouted and a casing and underreamer was advanced past the void to allow the bars and grout placement.
