Helical piles are used to repair and stabilize failing foundations or for construction of new foundations in soils that cannot support traditional foundations. They are hydraulically screwed into competent load bearing soils. Grip Tite’s helical piers have a true helix-shaped flight(s) welded to a central shaft to provide specified design capacities in both tension and compression. The helical flights are geometrically spaced along the shaft to provide minimal disruption of the soils as they are installed. A foundation bracket is then connected to support the failing foundation or specified terminations are connected to the installed shaft to support new foundations.

Advantages

  • Lead sections and extensions can be configured to achieve design depth and capacity
  • Lead sections available in 2, 5 and 7-foot lengths
  • Extensions available in 3, 5 and 7-foot lengths
  • Extensions utilize rigid, three-bolt couplings
  • Helical piers available with single, double and triple helix lead sections
  • Helix blade diameters of 8, 10, 12 and 14 inches
  • Available with hot-dipped galvanized coating for added corrosion resistance

Retrofit

  • Lead sections of pier can be configured to achieve design depths and capacities
  • Minimal excavation required around foundation area
  • Installs quickly with small or handheld equipment
  • Vibration-free installation (unlike traditional driven piles)
  • No wait ' piers installed year-round
  • Installs in areas with limited or tight access without generating spoils
  • Pier system installed below grade ' not visible once installation is complete
  • Cost-effective ' gets a structure back on solid ground
  • Permanent solution ' prevents further vertical movement

New Construction

  • All-weather installation
  • Can be installed with either handheld or small equipment
  • Can be installed in areas of limited or tight access
  • Foundation concrete can be poured immediately following installation
  • Lead sections can be configured to achieve design depth and capacity
  • Cost-competitive versus other deep foundation alternatives
  • Vibration-free installation (unlike traditional driven piles)
  • Installs quickly without generating spoils

Products

Round Shaft

Round shafts are 2 7/8" diameter, 3.5 inch diameter and 4.5 inch diameter. The Round Shaft lead sections utilize 1, 2 or 3 helix flights which are 8", 10", 12" and 14" in diameter.

Square Shaft

Square Shafts are 1.5, 1.75 and 2.25 inch Round Corner Square (RCS). Square Shaft lead sections utilize 1, 2 or 3 helix flights which are 8", 10", 12" and 14" in diameter.

New Construction Bracket

Standard Bracket

Heavy Duty Bracket

Flat Bracket

WalkWay Support Bracket

Post Bracket

Extensions

Round Shaft and Square Shaft Extensions have lengths of 3, 5 and 7 foot sections.


Specifications

Helical Pier/Anchor Tube

  • 2.875-inch Outside Diameter (O.D.) x 0.262-inch wall tube steel, ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 50,000 psi (min.)
  • Torque Strength Rating = 9,000 ft.-lb.
  • Torque Correlation Factor (Kt) = 9 ft-1

  • Connecting Bolts
    0.75-inch diameter Heavy Hex Machine Bolt (SAE J429 ' Grade 8)

  • Weld
    E70 ' minimum tensile strength = 70,000 psi
  • Ultimate axial capacity based upon installation torque = 100 kips (tension/compression)
  • Allowable axial capacity based upon installation torque = 50 kips (FOS = 2)
  • Allowable capacity with retrofit foundation bracket = 40 kips

New Construction Bracket

  • 3.5-inch O.D. x 0.300-inch wall (ASTM A500, Grade C)
  • 4.0 inches x 8 inches x 1-inch thick plate steel (ASTM A-36)

  • Connecting Bolts
    0.75-inch diameter Heavy Hex Machine Bolt (SAE J429 ' Grade 8)

  • Weld
    E70 ' minimum tensile strength = 70,000 psi
  • Allowable axial capacity = 50 kips (compression), 44 kips (tension)

Retrofit Foundation Bracket

  • Bracket Tube
    3.875-inch O.D. x 3.125-inch Inside Diameter (I.D.) x 10-inch long DOM mechanical steel tubing conforming to ASTM 513 ' Type 5 / Grade 1026. Ultimate tensile strength = 100,000 psi (min.), yield tensile strength = 90,000 psi (min.)

  • Angle Bracket
    0.5-inch thick flat plate conforming to ASTM A-36 hot rolled steel bent to form a 90 degree angle with equal sides of approximately 8 inches. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)

  • Bracket Support Strap
    0.375-inch thick x 3 inches wide x 21.25 inches flat bar conforming to ASTM A-36 hot rolled steel which is bent into a "horseshoe" shape around the bracket tube. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.

  • Top Plate
    0.75-inch thick x 5.5 inches wide x 9.5 inches long conforming to ASTM A-36 hot rolled steel. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)

  • Cap Plate
    1.0-inch thick x 4.0 inches wide x 8.5 inches long conforming to ASTM A-36 hot rolled steel. Ultimate tensile strength = 58,000 psi (min.), yield tensile strength = 36,000 psi (min.)

  • Weld
    E71T1, minimum tensile strength = 71,000 psi ' peformed by AWS certified welder

  • Threaded Rod
    0.75-inch diameter x 12 inches long ASTM A311 ' Class B / Grade 8 Zinc Plated. Ultimate tensile strength = 150,000 psi, yield tensile strength = 130,000 psi