Transmission And Substation Foundations - Technical Design Manual

SECTION 6: PRODUCT DRAWINGS AND RATINGS Type SS125 Helical Piles and Anchors

SS125 Helical Pile and Anchor Product Specifications

Hot-rolled round-cornered-square (RCS) solid steel bars per ASTM A29; modified AISI 1530 with 90 ksi minimum yield strength

SHAFT

Corroded 1.237 In 31.4 Mm

Shaft Size

1.25 in 32 mm

Corroded 0.191 In 4 Corroded 1.52 In 2 Corroded 0.31 In 3 Corroded 4.74 in

Moment of Inertia (I)

8.3 cm 4

0.20 in 4

7.95 Cm 4

Shaft Area (A)

1.55 in 2

10.0 cm 2

9.81 Cm 2

Section Modulus (S x-x )

0.32 in 3

5.3 cm 3

5.1 Cm 3

Perimeter

4.79 in 12.17 cm

12.0 cm

Coupling

Integral forged square deep socket

One 5/8 inch diameter ASTM A325 Type 1 hex head bolt with threads excluded from shear planes 0.375 inch thick, formed on matching metal dies, ASTM A572 Grade 50 or better Hot dip galvanized per ASTM A153 Class B-1, 3.1 mil minimum thickness or bare steel

Coupling Bolts

Helix Plates

Coatings

Torque Properties Torque Correlation Factor

10 ft -1

33 m -1

Torque Rating 4,000 ft∙lb

5,400 N∙m

Structural Capacity

Nominal

LRFD Design 37.5 kip 167 kN

Tension Strength

50 kip 222 kN

Assembly Of SS125 Figure 6-3

Allowable Tension Strength

25 kip

111 kN

Torque-Correlated Capacity Capacity Limit Based on Torque Correlation, Tension / Compression Ultimate 40 kip

Allowable

178 kN

20 kip 89 kN

ASD Allowable Compression Strengths of Chance® Type SS125 Helical Pile Lead & Extension Sections 1,2

ASD Allowable Axial Compression Strength (Kip) [Kn] Firm Soil Soft Soil Fixed Pinned Fixed

Section Type & Helix Count

Pinned 4.1 [18.2]

Lead, Single Helix

See Helix Strength Table Above

16.4 [72.9]

8.0 [35.6]

Lead, Multi-Helix

32.1 [142.8]

16.4 [72.9]

8.0 [35.6]

4.1 [18.2]

Extension

32.1 [142.8]

16.4 [72.9]

8.0 [35.6]

4.1 [18.2]

Notes: For SI: 1 kip = 4.448 kN. 1. Refer to Section 4.1.3 of ESR-2794 for descriptions of fixed condition, pinned condition, soft soil, and firm soil.

2. Strength ratings are based on a design corrosion level of 50 years and presume the supported structure is braced in accordance with IBC Section 1808.2.5 and the lead section with which the extension is used will provide sufficient helix capacity to develop the full shaft capacity.

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