HOME       Foundation Inspection Glossary of Foundation Terms Recent Project Highlights   FOUNDATION REPAIR   Horizontal Crack Repair Improper Horizontal Repair Underpinning and Releveling Foundation Replacement  DEEP FOUNDATIONS  Helical Piles Resistive Piers Drilled Piers   RETAINING WALL   & HILLSIDE ISSUES New Retaining Walls Retaining Wall Fortification Walls with Limited Access Landslide Repair Hillside Stabilization Hillside Road Repair Hillside Additions   COMMERCIAL PROJECTS   Mega Foundations Post-tensioned Concrete More Commercial Projects   FOR ENGINEERS   Liquefaction? Problem Solved Typical Helical Specs   CAREERS & CONTACT   Personnel Careers at Avalon 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 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.