High Capacity Helical Piles Limited Access Projects

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1 High Capacity Helical Piles Limited Access Projects Tel Canada, USA, Russia Brendan ODonoghue

2 Presentation Summary 1. Helical piles Background on large diameter shafts and helices 2. Where are helical piles used? 3. What are helical piles and how do they work? 4. When should I consider using helical piles? 5. Applications market sector examples 6. Limited Access Case 1 Big Jerry in Indiana Case 2 Water, pipes and Texas gators 7. Connections - Pile cap options, corrosion, load testing 8. Cost range per foundation 9. Limitations 10. Key Advantages Questions and Answers

3 Inventor A. Mitchell and early lithograph of open sea installation.

4 1. Helical Piles Large Diameter shafts and helices Invented in the 1830 s - lighthouse foundations, moorings and piers Today - Cyntech designs helical piles to carry loads of 650 kips and more.

5 2. Where are helical piles used? USA Major remaining wetland areas Red Dots critical areas Source: US Fish and Wildlife Mapper

6 Canada percent coverage of wetlands

7 Pile Diameters 3 to What are helical piles? Hollow steel pipe shaft with one or more helical plates welded to the pipe shaft. Rotated slowly into a good layer of high load bearing soil. Pile Lengths 15 to over 100ft Shear area is increased to the cylindrical area between the helical plates.

8 How do helical piles work?

9 Common Pile Shaft & Helix Diameters

10 Innovations High Capacity Loads

11 Load Range Table - 4 to 870 kips Ultimate Compression Capacity in Kips

12 4. When should I consider using helical piles? Soft soil sites High water table Little or No vibration tolerable Little or No noise tolerable Limited head room situations Short construction schedule speed required Contaminated soil sites - soil disposal costs high Lower carbon cost projects - Removable and reusable Remote locations, modular system easily transported Loads up to and over 650 kips = 290 tons = 2,890 kn

13 Excavator Skidsteer Boom truck, Drill Rig Custom frames Installation Equipment

14

15 1. High Capacity (650 kips +) Helical Pile Foundations 2. Pipeline Anchors for Buoyancy Control (tension anchors, square shaft, smaller loads) 3. Tank Repair Services 32 years of expertise Clients globally

16 5. Applications Market Sectors Buildings permanent and temporary Infrastructure - bridges, piers, walkways, street lights and sign bases Towers Transmission and Communication towers Retaining walls, slope stabilization, deep foundations Power Generation, Substations and Distribution lines Pipelines - pumping stations, buoyancy control Skid mounted equipment

17 Pipe racks Substation structures Emergency response Applications

18 6. Limited Access for High Capacity piles Requires innovative approaches to pile design and the equipment used.

19

20 Innovations in Rotary Drive Head Sizes

21 Case 1 Big Jerry in IN - 300,000 ft*lbs rotary drive head

22

23 Longer piles rotated deeper into heavier soils

24 Examples of High Capacity Piles Pile Type Axial Compressive Capacity (kips) Working Design Test Helical Pile Configuration A /19" OD x 0.275"wt shaft, 21' long w/ (2) 14" helices B /8" OD x 0.322" wt shaft, 21' long w/ (2) 24" helices C /8" OD x 0.322" wt shaft, 23' long w/ (3) 24" helices D /4" OD x 0.375" wt shaft, 24' long w/ (3) 28" helices E /4" OD x 0.500" wt shaft, 82' long w/ (3) 26" helices

25 Innovations - Limited Access Installs - Custom Frames

26 Frame base lifted into place

27 Frame Assembly

28

29

30 Case 2 Water, pipes and Texas Gators

31

32 Pile Clusters Helical Piles, rebar and concrete

33 Limited Access Installs Above and Below

34 Safety must ALWAYS be priority # 1

35 7. Connections - Pile Caps Singles & Pile Clusters

36 Larger pile caps for heavier loads

37 Corrosion Example Life Expectancy Table Increase the pipe wall thickness - least expensive Sacrificial anodes Coatings galvanizing and epoxy most expensive

38 Load Test Beams High Capacity Piles

39 8. Cost Range per Foundation Design depends on; Soil strata conditions Loads to be carried Location Engineered, modular foundations Material - Design and fabrication Cost Range $ 200 to $ 1,000 to $ 7,000 / pile Installation Cost Range $ 200 to $ 2,000 / pile General Rule - Larger diameter, longer piles cost more

40 9. Limitations Need soil data and loads of the structure to design accurately Not applicable in shallow rock or areas with a lot of embedded cobbles

41 10. Key Advantages of Helical Piles Safety fewer people on site for a shorter period of time Standard construction equipment used to install Verifiable load bearing capacity during installation Speed minutes / pile section vs. hours Immediately ready to be built on after installation Modular design allows for quick adaptation in the field Installs equally well in all seasons Cost competitive lower total installed foundation cost

42 Thank you Calgary, Alberta Houston, Texas (403) (936) Brendan ODonoghue (519)

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