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APPENDIX 2F
MODEL SPECIFICATIONS
Chapter 2
Helical Foundation Systems
6.5.1.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled
with four (4) bolts and nuts per coupled shaft section. The coupling hardware
consists of 1.750-inch standard hex bolts conforming to SAE J429 Grade 5
and standard hex nuts. The bolts and nuts are zinc coated in accordance with
ASTM B633.
6.6 Model HP700 Helical Pile System
6.6.1 This section is for general information purposes only. Larger diameter product lines,
such as Model HP700, are typically customized on a project specific basis.
6.6.1.1 Central Steel Shaft: The central steel shaft of the lead and extension sections
are 7.000-inch outer diameter by 0.362-inch nominal wall thickness, hollow
structural section in conformance with ASTM A252 Grade 3 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.
6.6.1.2 Shaft Coupling Material: The shaft coupling material consists of 7.750-inch
outer diameter by 0.313-inch nominal wall thickness, hollow structural section
in conformance with ASTM A513 Type 5, Grade 1026 with a minimum yield
strength of 70 ksi and a minimum tensile strength of 80 ksi. The shaft coupling
finish is either plain steel or hot-dip galvanized in accordance with ASTM A123.
6.6.1.3 Helix Plate Material: The helix plates are factory welded to the lead or extension
shaft sections. Helix plates with outer diameters of 10, 12 or 14 inches are
either 0.375 or 0.500-inch thick; 16-inch diameter helices are 0.500-inch thick.
Helix plates are manufactured with ASTM A572 Grade 50 steel with a minimum
yield strength of 50 ksi and a minimum tensile strength of 65 ksi. The helix
plate finish is either plain steel or hot-dip galvanized in accordance with ASTM
A123.
6.6.1.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled
with four (4) bolts and nuts per coupled shaft section. The coupling hardware
consists of 2.000-inch heavy hex bolts conforming to ASTM A307 and heavy
hex nuts. The bolts and nuts are zinc coated in accordance with ASTM B633.
7
DESIGN AND PERFORMANCE REQUIREMENTS
7.1 Helical piles shall be designed to support the specified compressive load(s) as shown on the
project Plans. The overall length, helix configuration and minimum torsional resistance of a
helical pile shall be such that the required capacity is developed by the helix plate(s) in an
appropriate bearing stratum.
7.2 All structural steel pile components shall be designed within the limits provided by the American
Institute of Steel Construction (AISC) Specification for Structural Steel Buildings (AISC-360).
Either Allowable Stress Design (ASD) or Load and Resistance Factor Design (LRFD) are
acceptable methods of analysis. Product testing in accordance with ICC-ES Acceptance Criteria
358 may also be considered as an acceptable means of establishing system capacities.
