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Foundation Supportworks by Woods Case Studies: Helical Pier Installation in Mt. Vernon Hospital

Friday, January 27th, 2017 by Desiree Bainbridge

Challenge

A local hospital planned a second level for an existing one-story building. A team of contractors determined the second-story addition would overload four existing column locations. Therefore, they proposed the installation of new columns next to the existing columns to support the additional loading. The hospital needed to remain operational during the entire renovation. Access and allowable working space was limited inside the building.

Solution

Given their ability to be installed within the confined space of the existing building using relatively small equipment, helical piles were selected to support the proposed columns. Model 350 (3.50-inch O.D. by 0.340-inch wall) hollow round shaft helical piles with an 8”-10”-12” triple-helix lead section were selected to support design working loads up to 50 kips per pile. Two column locations required a pair of helical piles to support a service load of 100 kips. Four helical piles were installed at each of the remaining two column locations to support a service load of 200 kips. The project engineer also specified two additional piles be installed near one of the new columns to provide support for contributory loads of a new wall construction. The piles were installed to achieve torque-correlated ultimate capacities of at least twice the design working loads (FOS ≥ 2). The installed helical piles were fitted with new construction caps and cast within the individual column footings. The helical piles were installed with a high-flow skid steer, which could be driven through standard double doors and over temporary bridging that spanned excavations within the tight working conditions. Scrubber attachments were used to mitigate exhaust fumes within the building. The helical pile installation was completed in just two days.

About the author
Desiree is a digital marketing coordinator at Woods Basement Systems.
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