Transmission And Substation Foundations - Technical Design Manual

SECTION 6: PRODUCT DRAWINGS AND RATINGS Type RS4500.237 Helical Piles

RS4500.237 Helical Pile and Anchor Product Specifications

Hot-rolled HSS 4 inch nominal Schedule 40 (0.237 inch nominal wall) per ASTM A500 Grade B/C with 50 ksi minimum yield strength

Shaft

Corroded 4.487 in 114 mm Corroded 4.071 in 103.4 mm

Shaft Size, Od 4.5 in

114 mm

Shaft Size, Id* 4.059 in

103.4 mm

Corroded 6.415 in 4 Corroded 2.786 in 2 Corroded 2.859 in 3

Moment Of Inertia (I)

282.6 cm 4

6.79 in 4

267.9 cm 4

Shaft Area (A) 2.96 in 2

19.1 cm 2

18.09 cm 2

Section Modulus (S x-x )

3.02 in 3

49.6 cm 3

47.0 cm 3

Corroded 14.09 in 35.8 cm

Perimeter

14.1 in

35.9 cm

Coupling

Integral forged round deep socket sleeve

Two 1 inch diameter ASTM A193 Grade B7 hex head bolts 0.5 inch thick, formed on matching metal dies, ASTM A572 Grade 80 or better Hot dip galvanized per ASTM A123 Grade 75, 3.0 mil minimum thickness or bare steel

Coupling Bolts

Helix Plates

Coatings

Torque Properties Torque Correlation Factor 6 ft- 1 Structural Capacity Tension Strength Torque Rating 18,000 ft∙lb Nominal 120 kip

20 m- 1

31,200 N∙m

LRFD Design

712 kN 90 kip 534 kN

Assembly of RS4500.237 Figure 6-29

Allowable Tension Strength

60 kip

356 kN

Torque-Correlated Capacity Capacity Limit Based Ultimate

Allowable

On Torque Correlation, Tension / Compression

108 kip

614 kN 54 kip 307 kN

Note: * Computed with 93% of wall thickness per AISC 360-10, B4.2

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