Chance Technical Design Manual

TABLE OF CONTENTS

SECTION 1: INTRODUCTION Atlas Resistance® Piers....................................................................................................................................1-2 Helical Piles/Anchors....................................................................................................................................... 1-6 Bibliography...................................................................................................................................................... 1-13 SECTION 2: SOIL MECHANICS Introduction .......................................................................................................................................................2-2 Soil Mechanics...................................................................................................................................................2-2 Site Investigations............................................................................................................................................2-7 SECTION 3: PRODUCT FEASIBILITY Feasibility Of Using Chance® Helical or Atlas Resistance® Pier Products...................................3-2 Shaft Size Selection Based on Soil Parameters .................................................................................. 3-4 Preliminary Chance Helical Pile/Anchor and Atlas Resistance® Pier Design Guide............... 3-4 SECTION 4: LOAD DETERMINATION Structural Loads ............................................................................................................................................. 4-2 Preliminary Tieback Design Guide............................................................................................................ 4-3 Tables For Estimating Dead Line (DL) & Live Line (LL) Loads...................................................... 4-6 Tables For Estimating Free Spans Between Supports...................................................................... 4-8 Preliminary Design Guidelines For Reinforced Concrete Grade Beams.................................... 4-12 Preliminary Design Guidelines For Reinforced Concrete Pile Caps............................................4-19 SECTION 5: DESIGN METHODOLOGY 5.1 Atlas Resistance Pier Capacity .........................................................................................................5-2 5.2 Chance Helical Pile/Anchor Ultimate Bearing Capacity...........................................................5-3 5.3 Evaluating Soil Properties For Design .........................................................................................5-14 5.4 Factor Of Safety ..................................................................................................................................5-20 5.5 HeliCAP Helical Capacity Design Software ............................................................................... 5-22 5.6 Application Guidelines For Chance Helical Piles/Anchors................................................... 5-25 5.7 Lateral Capacity Of Helical Piles ................................................................................................... 5-25 5.8 Buckling/Bracing/Slenderness Considerations........................................................................5-30 5.9 Helical Pile Deflection At Working Load.....................................................................................5-34 SECTION 6: INSTALLATION METHODOLOGY Atlas Resistance® Piers.................................................................................................................................. 6-2 Chance® Helical Piles/Anchors.................................................................................................................... 6-4 Installation Torque/Capacity Relationship............................................................................................. 6-4 Torque Indicator Calibration....................................................................................................................... 6-12 Installation Termination Criteria................................................................................................................ 6-12 SECTION 7: PRODUCT DRAWINGS AND RATINGS Atlas Resistance Piers.....................................................................................................................................7-2 Chance Helical Piles/Anchors...................................................................................................................... 7-7 Square Shaft Helical Piles and Anchors.................................................................................................. 7-11

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