Technical Manual

Inc.

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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.

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.