Chance Technical Design Manual

CHANCE TYPE SS225 HELICAL PILES AND ANCHORS • 210 kip ULTIMATE – 105 kip ALLOWABLE CAPACITY • INSTALLATION TORQUE RATING – 21,000 ft∙lb • MULTI-PURPOSE 2-1/4 INCH SOLID ROUND-CORNERED-SQUARE STEEL SHAFT WITH INTEGRALLY FORMED SQUARE UPSET SOCKETS

DESCRIPTION: Chance® Type SS225 helical piles and anchors have 210 kip ultimate capacity and 105 kip working or allowable capacity in compression and 200 kip ultimate capacity and 100 kip working or allowable capacity in tension. This capacity is based on structural strength ratings and well-documented correlations with installation torque, which is recognized as one method to determine capacity per IBC Section 1810.3.3.1.9. Lead sections and extensions couple together to extend the helix bearing plates to the required load-bearing stratum. Solid square shaft helical piles and anchors provide greater penetration into bearing soils and increased axial capacity in firm soils compared to round shaft helical piles with similar

torque strength. Strength calculations are based on a design corrosion level of 50 years for most soil conditions. Chance Type SS helical piles and anchors have a longer service life than do round shaft piles because of their reduced surface area. Chance Type SS helical piles and anchors feature sharpened leading-edge helix plates that are circular in plan to provide uniform load bearing in most soil conditions. Helix plates can be equipped with seashell cuts on the leading edge to enhance penetration through dense soils with occasional cobbles and debris. Custom lengths and helix configurations are available upon request. See below for additional information and other sections of this manual for specifications and design details.

DRAWINGS & RATINGS

CHANCE TYPE SS225 HELICAL PILES AND ANCHORS

TRUE HELIX FORM

HOLE ACCEPTS 1 1/4” DIA COUPLING BOLT

2 1/4” SQUARE SHAFT

3 x DIAMETER SPACING TYPICAL

UP TO 7' 0" LONG

1 1/4” DIA STRUCTURAL GRADE BOLT

3” PITCH SHARP LEADING EDGE

5-1/2”

2-7/8”

45 PILOT POINT

TRIPLE HELIX LEAD SECTION

QUAD HELIX LEAD SECTION

HELICAL EXTENSION SECTION

PLAIN EXTENSION SECTION

COUPLING DETAIL

All Hubbell Power Systems, Inc., Chance helical products are MADE IN THE U.S.A.

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