Technical Manual

Inc.

p 158

APPENDIX 2F

MODEL SPECIFICATIONS

Chapter 2

Helical Foundation Systems

6.1.3 Pile/anchor shafts and couplings shall have a fit-up tolerance of

1/16

inch or less.

6.1.4 Helix plates shall meet the following geometry and spacing criteria to minimize soil

disturbance:

6.1.4.1 True helix-shaped plates that are normal to the shaft such that the leading and

trailing edges are within

inch of parallel.

6.1.4.2 Helix pitch is 3 inches ±

inch.

6.1.4.3 All helix plates have the same pitch.

6.1.4.4 Helix plates have generally circular edge geometry.

6.1.4.5 Helix spacing along the shaft shall be between 2.4 and 3.6 times the helix

diameter.

6.1.4.6 Helix plates are arranged along the shaft such that they all theoretically track

the same path as their proceeding plate.

MATERIALS

7.1 Model HA150 Helical Anchor System

7.1.1 Central Steel Shaft: The central steel shaft of the lead and extension sections are 1.50-

inch, solid, round-corner square (RCS) hot-rolled steel bars conforming to ASTM A29

with a minimum yield strength of 90 ksi and a minimum tensile strength of 115 ksi. The

shaft finish is either plain steel or hot-dip galvanized in accordance with ASTM A123.

7.1.2 Shaft Coupling Material: The extension shaft sections have an internally forged upset

socket coupling at one end. Since the socket coupling is internally forged from the parent

shaft material, the material properties of the coupling are similar to the central steel

shaft. The shaft coupling finish is either plain steel or hot-dip galvanized in accordance

with ASTM A123.

7.1.3 Helix Plate Material: The helix plates are factory welded to the shaft lead or extension

shaft sections. Helix plates with outer diameters of 6, 8, 10, 12 or 14 inches are either

0.375 or 0.500-inch thick and 16-inch diameter helix plates are 0.500-inch thick. The

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.

7.1.4 Shaft Coupling Hardware: The lead and extension shaft sections are coupled with one

(1) bolt and nut per coupled shaft section. The coupling hardware consists of 0.750-inch

standard hex bolts conforming to SAE J429 Grade 8 and jam nuts. The bolts and nuts

are mechanically galvanized in accordance with ASTM B695.

7.1.5 Brackets: New construction bracket HA150NCB and thread rod adaptor HA150TRA

are suitable for tension applications with the HA150 shaft. Bracket finishes are either

plain steel or hot-dip galvanized in accordance with ASTM A123. Bracket shaft coupling

hardware finishes are mechanically galvanized in accordance with ASTM B695.