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Deep Foundations
Helical Piles and Helical Tiebacks
For Enginners:
Typical Helical Specifications
Drilled Piers
Liquefaction Solved
Underpinning
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
Grading
Road Washout Repair
Road Fortification
Hillside Stabilization
Challenging Hillside
Additions & Patios
Landslide Repair
Impact Walls
Avalon Supports
the Famous Rockettes
MEGA FOUNDATIONS
Here the foundation for a large structure is ready for helical pile installation. Employing helical piles for both compression and tension loads can reduce the size of the excavation. This can result in more economical foundations by minizing excavations and concrete usage.

Engineering by:
Allan Henderson,
Patrick and Henderson, Inc.

Inspections by:
Charles Lloyd Purdy,
Structural Observation Services

Pier Manufacturer:
Viking Helical Anchors
Avalon installing the second helical deep foundation for a mega structure fin Fairfield, CA. Each pier has a compression and tension capacity of over 250,000 pounds before grouting.

Engineering by:
Allan Henderson,
Patrick and Henderson, Inc.

Inspections by:
Charles Lloyd Purdy, of
Structural Observation Services

Pier Manufacturer:
Magnum Piering
Installation of 7 inch shaft diameter Stelcor drilled-in displacement piles, which forms a 14-inch grouted column, to 50-foot depth. This test pile passed a 327 kip (327,000 pound) pull test.

Especially when arranged in groups, these piles can support tremendous compression and tension loads.
This shows the grouting of the Steclor 50-foot pile. This system uses prioprietary by technology that does not require pressure grouting.
Helical piers for a mega structure for the County of Monterey in Soledad, CA.
As the helical pile is installed, it is continually checked for plumbness.
A tension test in Dixon, CA. The pier passed a 147,000-pound pull test without grout.
Both compression and tension capacity of helical pile can be increased inexpensively by pressure grouting. For this mega foundation, Avalon pressure grouted the soil around the discs of the helical pier. Grout was pumped through the shaft of the helical pier under 900 psi to densify and strengthen the soil.

Engineering by:
Allan Henderson,
Patrick and Henderson, Inc.

Inspections by:
Charles Lloyd Purdy
Structural Observation Services
Avalon Structural, Inc.
181 Ridgeview Drive
Aptos, CA 95003
(831) 479-4389 (office)
info@avalonstructural.com
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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.