Chance Technical Design Manual

SS225 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

2.25 in 57 mm

2.237 in

56.8 mm

CORRODED

2.04 in 4

84.9 cm 4

MOMENT OF INERTIA (I)

1.99 in 4

82.83 cm 4

CORRODED

5.0 in 2

32.1 cm 2

SHAFT AREA (A)

4.93 in 2

31.81 cm 2

DRAWINGS & RATINGS

CORRODED

SECTION MODULUS (S x-x ) 1.81 in 3

29.7 cm 3

1.79 in 3

29.37 cm 3

CORRODED

PERIMETER

8.5 in 21.5 cm

8.43 in

21.41 cm

COUPLING

Integral forged square deep socket

One 1-1/4 inch diameter ASTM A193 Grade B7 hex head bolt with threads excluded from shear planes 0.5 inch thick, formed on matching metal dies, ASTM A656 or A1018 Grade 80 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

21,000 ft∙lb

28,475 N∙m

STRUCTURAL CAPACITY

NOMINAL LRFD DESIGN 200 kip 890 kN 150 kip 667 kN

TENSION STRENGTH

ALLOWABLE TENSION STRENGTH

100 kip

445 kN

ASSEMBLY OF SS225 FIGURE 7-14

TORQUE-CORRELATED CAPACITY CAPACITY LIMIT BASED ON TORQUE CORRELATION, TENSION / COMPRESSION

ULTIMATE

ALLOWABLE

210 kip 934 kN 105 kip 467 kN

ASD ALLOWABLE COMPRESSION STRENGTHS OF CHANCE® TYPE SS225 HELICAL PILE LEAD & EXTENSION SECTIONS 1,2

ASD ALLOWABLE AXIAL COMPRESSION STRENGTH (kip) [kN] FIRM SOIL SOFT SOIL FIXED PINNED FIXED PINNED

SECTION TYPE & HELIX COUNT

See Helix Strength Table Above, except single 6 & 8 inch - 83.2 [370.1]

See Helix Strength Table Above

See Helix Strength Table Above

Lead, Single Helix

42.5 [189]

Lead, 2-Helix 8”-10” Lead, 2-Helix 10”-12” Lead, 2-Helix 12”-14” Lead, 2-Helix 14”-14”

169.9 [755.8] 146.5 [651.6] 133.8 [595.1] 126.4 [562.2] 198.6 [883.4] 198.6 [883.4]

149.8 [666.3] 146.5 [650.7] 133.8 [595.1] 126.4 [562.3] 149.8 [666.3] 149.8 [666.3]

83.2 [370.1]

42.5 [189]

Lead, Multi-Helix

83.2 [370.1] 83.2 [370.1]

42.5 [189] 42.5 [189]

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 accor dance 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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