HWY 140 Overpass

Slurry sand content test

Leland, North Carolina 

 

Challenges:

    A foundation contractor had contacted us concerning a project that was behind schedule, and had been stalled for 2 weeks. Foundation shafts were needed for a new interstate overpass over active railroad tracks. They had originally planned to drill the holes dry, but encountered saltwater then expected along with heaving sands. This was the first project that North Carolina DOT had used foundation slurry on. Shafts were 8 feet in diameter and 97 to 105 feet deep. 
     

Solutions:

  • Built slurry program based on the known geology and work site pictures of pilings. 
  • Setup slurry bubbler system to obtain maximum yield and higher viscosity from the slurry product.
  • Got project back on track from delays.
  • Active railroad tracks were 15 feet from the shaft locations and cave-ins were to be avoided if at all possible.