Chance Technical Design Manual

DRAWINGS & RATINGS

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

SHAFT SIZE

1.25 in

32 mm

1.237 in

31.4 mm

CORRODED

MOMENT OF INERTIA (I) 0.20 in 4

8.3 cm 4

0.191 in 4

7.95 cm 4

CORRODED

1.55 in 2

10.0 cm 2

SHAFT AREA (A)

1.52 in 2

9.81 cm 2

CORRODED

SECTION MODULUS (S x-x )

0.32 in 3

5.3 cm 3

0.31 in 3

5.1 cm 3

CORRODED

PERIMETER

4.79 in 12.17 cm

4.74 in

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

COUPLING BOLTS

HELIX PLATES

Hot dip galvanized per ASTM A153 Class B-1, 3.1 mil minimum thickness or bare steel

COATINGS

TORQUE PROPERTIES TORQUE CORRELA TION FACTOR

10 ft -1

33 m -1

TORQUE RATING

4,000 ft∙lb

5,400 N∙m

STRUCTURAL CAPACITY

NOMINAL

LRFD DESIGN

TENSION STRENGTH

50 kip

222 kN 37.5 kip 167 kN

ASSEMBLY OF SS125 FIGURE 7-4

ALLOWABLE TENSION STRENGTH

25 kip

111 kN

TORQUE-CORRELATED CAPACITY CAPACITY LIMIT BASED ON TORQUE CORRELA TION, TENSION / COM PRESSION 40 kip

ULTIMATE

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] 4.1 [18.2] 4.1 [18.2]

Lead, Single Helix Lead, Multi-Helix

See Helix Strength Table Above

16.4 [72.9] 16.4 [72.9] 16.4 [72.9]

8.0 [35.6] 8.0 [35.6] 8.0 [35.6]

32.1 [142.8] 32.1 [142.8]

Extension

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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