Engineering

Grip-Tite® Square Shaft Helical Anchor / Tieback

Grip-Tite offers a 1.5 inch 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.

Graphic on page = Brandon’s rotating helical pier

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)