| Retaining Walls and Landslide Repair
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| Avalon builds retaining walls in difficult places, often inaccessible to large equipment.
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| 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.
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| With small equipment, Avalon installed vertical helix piers to support the new retaining wall, with helix tiebacks for lateral support.
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| Vertical and diagonal helix after preliminary concrete pour.
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| The tieback extensions are galvanized, epoxy coated, and taped for triple protection. Foam wrapping was installed to protect the tape from gravel backfill.
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| Completed wall with patio. Design engineer: Patterson & Associates. Soils engineer: Friar Associates.
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| 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.
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| After installation of the tiebacks, drainage blankets, and rebar, Avalon applies the shotcrete.
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| A tall retaining wall with helix tiebacks (horizontal or diagonal helix members) at a steep bluff.
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| Tiebacks being installed for a basement wall.
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| A retaining wall being installed under an existing house.
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| Retaining wall fortifications with helix. Rebar and shotcrete follow.
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| Concrete wall fortification.
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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.
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| Construction of a retaining wall to expand a backyard.
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