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Retaining Walls
& Landslide Repair
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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.
Engineer: Milstone Geotechnical
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| A tall retaining wall with helix tiebacks (horizontal or diagonal helix members) at a steep bluff.
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| Soils: Tharp & Associates; Design engineer: Don Ifland
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| Example of wall construction: after excavation of the first six feet of the basement, the vertical black 2 inch pipes were installed, pounded to a depth below the basement floor. The second six foot was then excavated. The black pipe helped keep the earth in place. Helix tiebacks were then installed at 15 degrees from horizontal high and low. The black pipe were useful in wall construction.
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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.
The vertical steel beams are wide flange beams or W beams for short. They are set in deep holes in the ground. The W beams are cleaned and primed to one foot below ground, then concrete poured in the holes. Pressure treated lumber, or reinforced concrete, is placed between the W beams.
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| Many owners opt for reinforced concrete between the W beams for a better looking and longer lasting wall. In this photo, the owner stained the concrete between the W beams with concrete stain.
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| Limited access is not a problem for Avalon. This site precluded use a tractor. The steepness of the slope made the use of drilled holes (using a portable rig) impractical. The soil was too weak for a typical retaining wall.
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| Avalon used vertical piers to support the weight of the wall and deck above, and pairs of helix tiebacks, one high and one low, to resist the lateral pressures of the hillside and house. In the photo below, the lower row of tiebacks are below grade.
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Avalon Structural, Inc.
181 Ridgeview Drive
Aptos, CA 95003
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Phone: (831) 479-4389
Fax: (831) 479-0328
Email: roger@avalonstructural.com
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CA License 677116
Classifications: B, C-8
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