Drilled Shafts & Low-Headroom Micropiles Help Shoulder The Load For Advancements In Healthcare At HumcÂ’s 2nd Street Pavilion-PPT Presentation

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Hackensack University Medical Center’s nine-story, 500,000-square-foot 2nd Street Pavilion is a major addition designed to connect across 2nd Street to an existing parking garage. Keller’s $8.1 million scope included drilled shafts, low-headroom micropiles, and excavation support.<br /><br />The urban site presented steep grades, restricted access, active hospital operations, extensive existing and proposed utilities, and coordination among numerous contractors. Work took place largely from October 2019 to February 2020. Subsurface conditions included fill, overburden soils, weathered shale, and competent red shale bedrock.<br /><br />Keller redesigned the drilled-shaft foundations, reducing the original 6-foot shafts to 5-foot shafts in most cases. Load testing included bi-directional O-cell tests and lateral tests, which informed the final design. The controlling design case carried 6,250 kips of compression and 45 kips of lateral load; bedrock confinement and casing eliminated the need for ties.<br /><br />Thirty-nine micropiles were installed in a confined area inside the existing hospital, working from a small slab cutout. Each used short casing sections and full-length reinforcing bars that could be handled by workers in the limited space. Load tests demonstrated performance under compression, tension, and lateral loads.<br /><br />The excavation-support system combined permanent and temporary one-sided walls, with cuts up to 35 feet supporting the existing hospital. It comprised 108 soldier piles, 52 tiebacks, and approximately 13,000 square feet of lagging. The foundation and support work enabled construction of the Pavilion’s superstructure.

Keywords

Hackensack University Medical Center

2nd Street Pavilion

drilled shafts

micropiles

excavation support

hospital construction

bedrock foundation

load testing

soldier piles

tiebacks