Award of Merit: Strengthening Category
Leon County Courthouse Parking Garage Repair and Strengthening
Submitted by Structural Preservation Systems, Inc.
Leon County Facilities
Structural Preservation Systems, Inc.
Lyndhurst, New Jersey
The Leon County Courthouse Parking Garage is a cast-in-place concrete structure with a capacity of more than 500 vehicles. The garage consists of five below-grade parking levels and a five-floor office structure above the parking levels. The garage also contains a memorial honoring World War II veterans. Weighing approximately 135 tons (122 metric tons), the statue sits on top of the courthouse’s plaza deck, which is also the roof of the parking garage. Before construction of the memorial, tests revealed that the provided reinforcement was not adequate to carry the load from the monument. Additional inspection revealed that the garage was already showing serious cracking on all floor levels, leading the owner to pursue and implement a comprehensive structural evaluation and strengthening program.
Major cracks were targeted for epoxy injection. Full-depth cracks were pressure-injected, while other cracks were injected by the gravity feed method. For the 35 locations identified as having shear deficiency, steel collars and cast-in-place drop panels were installed. Finally, slabs were strengthened using either a carbon-reinforced polymer strip system or span reduction using cast-in-place beams.
Because of the demand for the parking structure, only a limited number of spaces could be taken out of commission at any given time, so all work was performed at night and on Saturdays. And, because the building was occupied, a special poly-envelope was constructed to create a dust-free environment.