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Deep Foundations
Helical Piles and Helical Tiebacks
For Enginners:
Typical Helical Specifications
Drilled Piers
Liquefaction Solved
Horizontal Cracks
Foundation Replacement
Resistive Piers
Underpinning Done Right
Mega Foundations
with Helical Piles
Solar Panel Arrays
with Ground Screws
Pipeline Anchors
Bridge Abutments
Post-tensioned Concrete
More Commercial Projects
Retaining Wall Basics
Retaining Wall Fortification
Solving Limited Access
Using EPS Blocks
Using W-beams
Drainage Systems
Excavation & Drilling
Road Washout Repair
Road Fortification
Hillside Stabilization
Challenging Hillside
Additions & Patios
Landslide Repair
Impact Walls
Avalon Supports
the Famous Rockettes
CASE STUDY #04 (1 of 5)

The following five pictures concern a road washout along steep hillside.

Owner had searched three years to find an affordable contractor. Before finding Avalon, his lowest bid was over $200,000 to repair the washed-out road.
CASE STUDY #04 (2 of 5)

For vertical support down into bedrock, Avalon employed 3.5" round-shaft helical piers. These piers were then grouted. Additionally, 1.5" square shaft helical tiebacks were driven diagonally to hold the road section to the hillside.
CASE STUDY #04 (3 of 5)

The outboard grade beam has been poured. Cantilever platform in place, curb formed. Inboard grade beam helix and steel set, deck double mat steel set, ready for concrete.
CASE STUDY #04 (4 of 5)

Avalon's final bill to the owner: much less than the competition. Job completed start to finish in 21 calendar days despite rain. Owner happy; Avalon proud.

Design Engineer:
Bob Patterson,
Patterson & Associates.

Soils Engineer:
Becky Dees,
Dees & Associates.
CASE STUDY #04 (5 of 5)

Here is the finished product from another view.
CASE STUDY #15 (1 of 2)

Here is a typical minor road washout. A different contractor had proposed using a W beam retaining wall alongside the road.
CASE STUDY #15 (2 of 2)

Our solution at Avalon was less expensive, more certain, and would last longer. We proposed using vertical helical piers and tiebacks with concrete. Avalon also upgraded the culvert with a larger pipe and new inlet.

Soils Engineer:
Don Tharp,
Tharp & Associates

Project Engineer:
Bob Patterson,
Patterson & Associates.
CASE STUDY #23 (1 of 1)

Avalon installed vertical and diagonal helix piers to support this section of road over poor soils.

Design engineer:
Bob Patterson,
Patterson & Associates

Soils engineer:
Haro & Kasunich.
Avalon Structural, Inc.
181 Ridgeview Drive
Aptos, CA 95003
(831) 479-4389 (office)
Copyright © 2015
Avalon Structural, Inc.
All Rights Reserved
CA License 677116
Classifications:  B, C-8
Avalon is a general building
contracting firm and
does not employ engineers.