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A tie back is a horizontal wire or rod, or a helical anchor used to reinforce retaining walls for stability.

Applications
Used to stabilize existing walls that are failing or bowing inward
Used for adding strength in newly construction walls
Used to stop shear movement of foundation and retaining walls

How to Install
A hole is cored through the wall
The helical anchor is screwed in to the soil past the zone of soil that is moving towards the wall to secure the wall against further movement
A wall plate is mounted to add strength and stability to the previously-compromised wall.

Advantages
Very high capacity that are proofed during installation
Can be designed to stop all types of movement form lateral soil pressure
Quick installation and return to service
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
Available with hot-dipped galvanized coating for added corrosion resistance