Helical Tiebacks

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Grip-Tite offers a 1.5 inch Square Shaft Helical and 1.75 Square Shaft Helical suitable for anchor and tie-back applications. The Grip-Tite® Square Shaft Helical Anchor lead sections and extensions are available with helix blade configurations to meet project-specific requirements.


Advantages

  • Predictable capacity
  • No excavation required on the high-grade side of foundation or retaining walls.
  • Installs with either handheld or small equipment in areas of limited or tight access
  • Load test can be conducted immediately after installation
  • Generates no spoils
  • Clean installation – no messy grout
  • All-weather installation

Features

  • Lead sections available in 2, 5 and 7-foot lengths
  • Extensions available in 3, 5 and 7-foot lengths
  • Socket and bolt connections
  • Helical leads and extensions available with helix blade configurations to meet project-specific requirements.
  • Helix blade diameters of 8, 10, 12 and 14 inches.
  • Available with hot-dipped galvanized coating for added corrosion resistance.

Specifications

  • 1.5 inches round corner square shaft (C1530 Modified)
  • Torque Strength Rating = 7,000 ft.-lb.
  • Torque Correlation Factor (Kt) = 10 ft-1
  • Connecting Bolts: 0.75-inch diameter Heavy Hex Machine Bolt (SAE J429 – Grade 8)
  • Ultimate axial capacity based upon installation torque = 70 kips (tension)
  • Allowable axial capacity based upon installation torque = 35 kips (FOS = 2)
  • Allowable axial capacity based upon shear of coupling bolt = 26.5 kips (per Allowable Stress Design Method)