Spacing of Compression/Tension Helical Piles based on 3 Definitions

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The spacing of helical piles has many definitions across manufacturers, acceptance criteria and codes. The only similarity is all are based on the Diameter of Largest Helix Plate, (DLH as defined in this report). Based on this similarity, we can conclude that helical piles as an end bearing system would naturally cause spacing criteria to be at the bearing depth. Please refer to the figure for pictorial spacing definitions.

Case 1: Chance Helical Pile Tech Manual 3rd Edition 2014


  •   5 x DLH , Where Spacing is defined as the distance between helix plates. See Spacing B.
  •   Minimum = 3’

    It is recommended that the center-to- center spacing between adjacent anchors/piles be no less than five times the diameter of the largest helix. The minimum spacing is three feet. Minimum spacing requirements apply only to the helix bearing plate(s), i.e., the pile/anchor shaft can be battered to achieve minimum spacing. Group effect, or the reduction of capacity due to close spacing, has never been accurately measured with helical piles. However, bearing capacity theory would indicate that capacity reduction due to group effect is possible, so it’s considered good practice to install helical piles into dense bearing stratum when center-to center spacing is less than 4 feet.

    Case 2: AC358 – Acceptance Criteria for Helical Pile Systems and Devices


 3 x DLH , Where Spacing is defined as the distance between helix plate edges. See Spacing B.  OR
 4 x DLH , Where Spacing is defined as center-to-center of adjacent helix plates. See Spacing C.

The results of this analysis and the structural capacities shall be used to select a helical pile system. The evaluation report shall state that to avoid group efficiency effects an analysis prepared by a registered design professional shall be submitted where the center-to-center spacing of axially loaded helical piles is less than three times the diameter of the largest helix plate at the depth of bearing. The spacing between helical plates shall not be less than 3D, where D is the diameter of the largest helical plate measured from the edge of the helical plate to the edge of the adjacent helical pile plate, or 4D, where the spacing is measured from the center to the center of the adjacent helical pile plates.

Case 3: 2014 New York City Building Code

 4 x DLH , Where Spacing is defined as center-to-center of pile shaft. See Spacing A.

1812.10 Minimum Spacing of Piles. Minimum spacing between the center lines of helical piles shall be four times the largest helix plate diameter.

By Steve Gencorelli, P.E. (

The Holiday Helical Miracle 3: The Santa Solution

By Caitlin Haffert

(…with continued annual apologies to Clement Clarke Moore)

helical holiday, christmas, helical piers, helical piles, helical anchors, DANBRO Distributors, A.B. CHANCE, festive

‘Twas the night before Christmas, when all through the house,
Not a creature was stirring, still no opossum or mouse.
For I had just learned from the big man himself,
Of a North Pole crisis involving the jolly good elf!  Continue reading

Helical Holiday Wishes for Thanksgiving!

helical piles, helical pile, helical anchors, helical anchor, helical piers, helical pier, turkey, danbro distributors, chance helical piers, chance helical piles, Happy Thanksgiving,
DANBRO would like to use the opportunity of this holiday to thank our installers, past and present, our business associates, and design professional friends for their business, their professionalism, and their trust in our engineering and support services.

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Sandy Solution Southampton, NY Helical Pile Project Featured on Helical Pile World

Helical piles, Helical piers, home elevation, Superstorm Sandy, The Sandy Solution, Southampton, NY, Helical Piles NY, High Rise Industries

Certified CHANCE installers, Helical Piles NY, installed 48 CHANCE® helical piles under a Sandy-damaged home in Southampton, NY.

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DFI’s Helical Pile Usage for Disaster Relief Seminar Available Online

DFI, Helical Pile Usage for Disaster Relief, Newark, NJ, Gary Seider, Hubbell, CHANCE, Steve Gencorelli, DANBRO Distributors

If you missed the DFI’s Helical Piles and Tiebacks Specialty Seminar, Helical Pile Usage for Disaster Relief, in September, you can now view the proceedings online!

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Remedial Repair Piling System Comparisons

[Reposted with Permission – Read Original Here:]

By Josh Lindberg

Wylie, TX, Texas, Hargrave Foundation Repair, CHANCE helical piles, certified CHANCE installer, helical piles, helical piers, helical anchors,

One of the most common questions homeowners ask is, “Why is your piling system better than XYZ”? With access to more information than at any other point in human history, it is very easy to find the advantages but seldom the disadvantages as they are not typically advertised. The internet is a wonderful thing but a world wide WEB is exactly what it is. To help anyone make the best decision they can, we are providing the following information. The information should not be your sole source of study, but rather, a simpler overview of the different systems. When reviewing this information, always remember that this is YOUR home. Even though some companies may put on a better show, it does not mean that they are the best. Strong advertising cost a lot of dollars and those dollars come from homeowners just like you. Remember to always use common cents.

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Economical Helical Pile Field Solutions for Low Torque Values

By Steve Gencorelli, P.E.


Project Site Data

No geotechnical reports or soil borings were performed for this project.

If soil information is not available, a torque-to-capacity helical pile test should be installed at multiple locations on the site. This should be completed to determine the depth, size, and number of helical plates required for the project pile loads.

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DANBRO to Give Helical Demonstration at IASM’s 34th Annual Conference

IASM flyer 2016 copy

The International Association of Structural Movers will be holding their 34th Annual Conference in Long Branch, NJ, April 6-10, 2016 – and DANBRO will be there!

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Flashback Friday: A Very Helical Halloween

DANBRO has had some unique employees over the years, including a gorilla that visited on what was forever known as a very helical Halloween.  Happy Helical Halloween to all!

Danbro Distributors

By Gorilla

I visited the DANBRO office yesterday and things got a little SCREWy on this very Helical Halloween!

gorilla desk “Ha ha ha, SCREWy.  I’m so clever!”

gorilla desk 3 “People still think gorillas are monkeys?!”

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Superstorm Sandy Three-Year Anniversary

Hurricane Sandy, Superstorm Sandy, Sea Isle City, New Jersey, The Sandy Solution, Underwater

Sea Isle City, NJ underwater during Hurricane Sandy.

Today, October 29th, 2015, marks the three-year anniversary of Superstorm Sandy making landfall in New Jersey and creating mass destruction in New Jersey, New York, and Connecticut.

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