HELICAL SCREW ANCHORS AND FOUNDATIONS IN SOIL. History, Applications, Design

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1 HELICAL SCREW ANCHORS AND FOUNDATIONS IN SOIL

2 Historical Perspective 1 st Recorded use of a Screw Pile was by Alexander Mitchell in 1836 for Moorings and was then applied by Mitchell to Maplin Sands Lighthouse h in England in In 1843, the 1 st Screw Pile Light House in the U.S. was Constructed by Capt. William H. Swift at Black Rock Harbor in Connecticut. Swift used Mitchell Screw Pile Technology. In the 1840 s and 50 s, More Than 100 Screw Pile Foundation Light Houses were Constructed Along the East Coast, the Florida Coast and the Gulf of Mexico

3 Mitchell s Screw Pile

4 PRODUCT TYPES

5 Square Shaft Helical Screw Foundations & Anchors A.B. Chance Type SS Characteristics ,000 ft lbs. Installation Torque Design Tension Loads up to 100 kip (445 kn), Design Comp. Loads up to 100 kip (445 kn) Helix Dia: 6 (152 mm) 8 (203 mm) 10 (254 mm) 12 (305 mm) 14 (356 mm) Type SS5 & SS /2 (35 kips) SS /4 (50 kips) SS200 2 (75 kips) SS /4 (100 kips)

6 SCREW ANCHOR LEAD SECTION Single, Twin, Triple or Quad Helix Configurations

7 PLAIN EXTENSION SECTION 3-0 (.9 m), 5-0 (1.5 m), 7-0(21m)& ( (3 m) Lengths

8 EXTENSION SECTION WITH HELIX PLATES 12 (305mm) and 14 (356 mm) Diameter Helix Plates

9 Foundation Underpinning i Brackets STANDARD-DUTY FOUNDATION REPAIR BRACKET HEAVY-DUTY FOUNDATION REPAIR BRACKET FOR 1 ½ SHAFT RATED CAPACITIES: 20,000 LB. WITH SS5 ANCHORS 25,000LB. WITH SS150 ANCHORS FOR 1 ¾ RATED CAPACITY: 30,000LB. FOR 1 ¾ SHAFT RATED CAPACITY: 40,000LB.

10 Pipe Shaft Helical Screw Foundations A.B. Chance Type LIFT & 278 Combo Characteristics 5, ft lbs. Installation Torque Rating Design Tension Loads up to 30 kip (133 kn), Design Comp. Loads up to 34 kip (133 kn) Helix Dia LIFT: 10 (254 mm) Helix Dia SS5/150 Lead: 6 (152 mm) 8 (203 mm) 10 (254 mm) 12 (305 mm) 14 (356 mm) Pipe Shaft Dia: 2-7/8 (73 mm) Type SS5 to 278 Combo Pile LIFT Pile

11 Pipe Shaft Helical Screw Foundations A.B. Chance Type HS Characteristics 11,000 ft lbs. Installation Torque Design Tension Loads up to 60 kip (267 kn), Design Comp. Loads up to 60 kip (267 kn) Helix Dia: 6 (152 mm) 8 (203 mm) 10 (254 mm) 12 (305 mm) 14 (356 mm) Pipe Shaft Dia: 3-1/2 (89 mm) Type HS Type SS to HS Combo Pile

12 APPLICATIONS FOR HELICAL SCREW ANCHORS Underpinning - Residential / Commercial Helical Screw Foundations for New Construction Tiebacks for Excavation Bracing Soil Nails for Earth Retention Seismic Retro-fit Guy Anchors & Foundations for Towers

13 Foundation Underpinning

14 Foundation Underpinning Screw Foundation Installation with Portable Installer

15 Foundation Underpinning Raising Building with Repair Brackets Repair Brackets

16

17 Helical Screw Foundations for New Construction

18

19 New Construction - Slabs and Foundations Screw Foundations Supporting Industrial Building Screw Foundations Supporting Structural Slab

20

21 PIPE SHAFT PILES

22 New Construction ti Connection Details Pile Cap Detail Grade Beam Connection Detail

23 Helical Screw Foundations for Towers Installation of Screw Foundations with Back-Hoe Ten Screw Foundations per Tower Leg

24 Walkways for Wetlands

25 Screw Anchor Tiebacks

26 Soil Screws for Soil Nail Walls

27 Guy Anchors for Towers Installation of Multiple Screw Anchors for Guy Point

28 Guy Anchors for Towers Single Guy Anchor, Multiple Guy Wires

29 THEORY AND DESIGN OF HELICAL PIER FOUNDATIONS

30 Lateral Load Capacity Grade Beam & Pile Cap Passive Earth Pressure Resistance Optional Lateral Tieback

31 Tieback Screw Anchor Section Detail

32 Soil Screw Anchor Section Detail

33 HeliCAP TM Engineering Software Theoretical Bearing Capacity - Based on Soil Strength Available from A. B. Chance Civil Construction Web Site -

34 INSTALLATION TORQUE VS. ULTIMATE CAPACITY

35 TORQUE MOTOR REACTION BAR FOOT CONTROL 2,500ft-lbs through 8,000ft-lbs

36 Hydraulic, Vehicle-Mounted 3,500 FT.-LB. 6,000 FT.-LB. 12,000 FT.-LB. 20, FT.-LB

37 MACHINE CROWD TORQUE MOTOR TORQUE INDICATOR FOUR HELIX LEAD SECTION

38 FIELD MODIFICATIONS Vary Helix Size Vary Helix Numbers Install into Better Soil

39 Compression Load Test Set-Up

40 HELICAL PULLDOWN MICROPILES Screw Pile Foundation Installation Method Used to Increase the Section Modulus of a Standard SS or Pipe Shaft. Patent Protected U.S. 5,707,180; Methods and Apparatus Other U.S. and Foreign Patents Pending Method of Displacing Soil Around the Anchor Shaft and Replacing with Grout Column. Soil is Displaced by Lead Displacement Plate. Extension Displacement Plates Serve as Centralizers and Provide the Means for Which the Grout is Pulled-Down.

41 DESCRIPTION Increased Section Modulus Likewise Increases Lateral Buckling Capacity of the Screw Pile. Grout Column Provides Increased Compression Capacity. Mobilizes Skin Friction at the Grout/Soil Interface. Displacement Plates Range in Size from 4 Up to 10 in Diameter. Required Plate Size is Specified for Each Project Grout tcolumns Can be Cased when Required.

42 Helical Screw Foundations With Grouted Shafts HELICAL PULLDOWN Micropile Characteristics ,000 ft lbs. Installation Torque Design Tension Loads up to 100 kip (445 kn), Design Comp. Loads up to 200 kip (890 kn) Helix Dia: 6 (152 mm) 8 (203 mm) 10 (254 mm) 12 (305 mm) 14 (356 mm) Prevents Buckling Increases Capacity Corrosion Resistance Uses Type SS (Square Shaft) Material

43 HELICAL PULLDOWN TM Micropile MODEL Grade Q t = Q H + Q f Soft or Loose Overlying Strata Displacement Plates Helix Plates Grout Column Q f = Df s L f f] EdB End Bearing Stratum t Q H = i cc i q i N q

44 Installing Lead Case

45 Pouring Grout Joint Packing

46 Installing Top Case Adding Centralizer

47 Installing Shaft Extension Grout Pulled Down

48 Pile Extracted After Test Un-Cased Grout Column Top Case

49 Grout Column With Soil Removed

50

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