Failing Slab Repair for United Air Cargo Facility-PPT Presentation

PPT Presentation

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United Air Cargo’s active facility had a settling concrete slab that needed repair while the warehouse continued operating 24/7. Work was divided into phases to maintain operations. Installation was complicated by low overhead clearance of 12–24 feet, loading-dock access limits, and a need for low-emission equipment.<br /><br />Keller used helical piles as deep foundation elements to support the replacement slab. The site’s geology and loading were suitable, with dense fine sand at the pile tips and a target compression capacity of 20 kips. Piles were installed to depths of approximately 30–33 feet, reaching the required torque.<br /><br />Helical piles suited the project because their compact equipment footprint fit within the warehouse, they produced little to no spoil, and installation caused minimal noise and vibration. They could also be installed close to exposed electrical conduits buried in the slab without disturbing or damaging them. Between project phases, equipment could remain onsite or be demobilized, helping reduce remobilization costs. The concrete contractor also benefited from minimal cleanup and footing preparation before pouring the new slab.<br /><br />The approach depends on suitable soil conditions and may be limited by hard obstructions that helical piles cannot penetrate. Variable-length pile sections can help accommodate restricted headroom.

Keywords

helical piles

warehouse slab repair

deep foundation

settling concrete slab

24/7 operations

low headroom

low-emission equipment

minimal vibration

loading dock access

soil conditions