Avalon Structural Inc.
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Retaining Walls and Landslide Repair
Avalon builds retaining walls in difficult places, often inaccessible to large equipment.
The following five pictures concern the replacement of a collapsed retaining wall that had been supporting a creek-side home. The first photo shows the retaining wall which had fallen over.
With small equipment, Avalon installed vertical helix piers to support the new retaining wall, with helix tiebacks for lateral support.
Vertical and diagonal helix after preliminary concrete pour.
The tieback extensions are galvanized, epoxy coated, and taped for triple protection. Foam wrapping was installed to protect the tape from gravel backfill.
Completed wall with patio. Design engineer: Patterson & Associates. Soils engineer: Friar Associates.
The following two pictures concern the emergency installation of a tied-back shotcrete plate. The first photo shows helix tiebacks being installed within days after a landslide endangered this home.
After installation of the tiebacks, drainage blankets, and rebar, Avalon applies the shotcrete.
A tall retaining wall with helix tiebacks (horizontal or diagonal helix members) at a steep bluff.
Tiebacks being installed for a basement wall.
A retaining wall being installed under an existing house.
Retaining wall fortifications with helix. Rebar and shotcrete follow.
Concrete wall fortification.
Avalon built a series of impact walls to protect life and property against a potential log-slide. The wall is supported by 3.5" round shaft helical piers both vertical and diagonal, with W beams and C channel. (Photo taken before installation of 6x lagging between the vertical W beams.)

Soils engineer: Dees & Associates. Project engineer: Patterson & Associates.
Construction of a retaining wall to expand a backyard.