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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
4.2.2 Documentation that the manufacturer’s helical piles have been used successfully in at
least five engineered construction projects within the last three years,
4.2.3 Product acceptance by the local building code official(s) having jurisdiction over the
project, and/or
4.2.4 Current ICC-ES product evaluation report or complete description of product testing
and manufacturing quality assurance programs used to assess and maintain product
quality and determine product mechanical strength and geotechnical capacity.
5
ACCEPTABLE PRODUCTS
5.1 Hollow Round Shaft Helical Pile Models HP237, HP287, HP288, HP350, HP450, HP662
and HP700 manufactured in accordance with the requirements of Sections 5 and 6 of this
specification.
5.1.1 Hollow round shaft helical piles shall be used to resist compression loads. Round shaft
helical piles are generally more resistant to bending or buckling over solid square shaft
counterparts due to superior cross-sectional properties and coupling details.
5.1.2 Pile shaft sections shall be in full, direct contact within couplings so as to remove
coupling bolts and coupling welds from the “in-service” axial load path.
5.1.3 Pile shafts and couplings shall have a fit-up tolerance of
1/16
inch or less.
5.1.4 Helix plates shall meet the following geometry and spacing criteria to minimize soil
disturbance:
5.1.4.1 True helix-shaped plates that are normal to the shaft such that the leading and
trailing edges are within
¼
inch of parallel.
5.1.4.2 Helix pitch is 3 inches ±
¼
inch.
5.1.4.3 All helix plates have the same pitch.
5.1.4.4 Helix plates have generally circular edge geometry.
5.1.4.5 Helix spacing along the shaft shall be between 2.4 and 3.6 times the helix
diameter.
5.1.4.6 Helix plates are arranged along the shaft such that they all theoretically track
the same path as the proceeding plate.
6
MATERIALS
6.1 Model HP237 Helical Pile System
6.1.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 2.375-
inch outer diameter by 0.154-inch nominal wall thickness, hollow structural section in
conformance with ASTM A500 Grade B or C with a minimum yield strength of 60 ksi
and a minimum tensile strength of 70 ksi. The shaft finish is either plain steel or hot-dip
galvanized in accordance with ASTM A123.