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MACROPILES TM: Ultra-High-
Capacity Micropiles for
Foundation Support
John R. Wolosick, P.E.
Hayward Baker Inc., Atlanta, Georgia USA
ISM – International Society for Micropiles
May 4, 2006
Schrobenhausen, Germany
Atlanta Hartsfield International Airport
1000 Ton Load Test
12 inch Diameter Outer Pipe
Double Reaction Beam Set-Up
Independent Reference Frame
FHWA Minipile Load Test
Hartsfield Int'l Airport
Atlanta, GA
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
0.0 200.0 400.0 600.0 800.0 1000.0 1200.0
Load (Tons)
Deflection
(Inches)
Test #1 Data
Rebound Curve 2
Design Load
Test #2 Data
Rebound Curve 2
Design Load
400 Tons
1.277
0.916
0.258
0.340
Jackson Avenue & 47th Avenue
Long Island City, Queens, NY
August, 2005
Installation of 29 Macropiles reduced foundation
installation from 100 Micropiles
750 Ton working axial capacity
18 inch (450 mm) OD steel pipe, 6 #20 (64 mm)
Grade 80 Steel bars, 6000 psi (41,350 kPa) cement
grout
Section View
of Macropiles
and Pile Cap
Section View of Macropile Reinforcement
High Strength Cages with Tremie Tubes
Reinforcing Cage and Tremie Details
Setting
Reinforcing
Cage with Crane
Reinforcing Cage within Casing
Bearing
Plates:
30 inch x
30 inch
(760 mm x
760 mm)
Chelsea Arts Tower
New York, NY
February, 2005
22 Story Condominium Structure
27 Macropiles installed
Diameters were 12, 18, 24 inch (305, 450, 610 mm)
Design (Working) Loadings were up to 1400 Tons
compression and 225 Tons tension!
Section View
of Macropiles
and Pile Cap
Section View of Macropile Reinforcement
MACROPILE DESIGN LOADS
Macropile
Layout
Reinforcement Design
for 1400 Ton Macropile
Plan View Layout for Macropiles
Flushing out a rock socket
prior to Macropile installation
Assembly of Macropile Reinforcing Cage
Setting
Reinforcing
Cage with
Crane
Setting Reinforcing
Cage on a Snowy
Day
The End
Questions?

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