HELICAL PIER PRODUCTS

SELECTING A HELICAL PIER

Helical Piers are also known as screw piles and helical piles. Helical pier shaft sizes range from 2-7/8" to 36" in diameter with varying wall thicknesses. The table below lists the most common and readily available pipe shaft sizes.

Pipe Shaft O.D. Common Wall Thickness Maximum Torque(Ft.Lbs.)  2-7/8"  0.217  8,000  3-1/2"  0.254  16,000  4-1/2"  0.250, 0.237  21,500 20,400  5-1/2"  0.275  43,600  6-5/8"  0.280, 0.250  53,900  8-5/8"  0.264, 0.322  67,000 81,200  10-3/4"  0.365, 0.250  +90,000  12-3/4"  0.375, 0.250  +90,000

Smaller diameter shafts are mainly used for compression and tension loads where lateral loads are   minimal.

Larger diameter shafts are used when the piers are subjected to large compressive loads   and/or lateral loads and/or moments of overturn.

The criteria for the appropriate shaft size selection include, but are not limited to:          axial load  tension load    lateral load  moment of overturn    torque considerations  installation equipment    helix size  soil conditions