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The Use of Helical Anchors as a
Foundation Solution to Build
Transmission Line Towers in Brazil
Danilo Policastro P.E.
Latam Civil Application Engineer
MacLean Power Systems
DFI SuperPile 2016
Danilo Policastro
1
Brazil Transmission Market Overview
DFI SuperPile 2016
Danilo Policastro
2
INVESTMENT UNTIL 2018
R$ 70 BILLION
US$ 20 BILLION
37.600 KM
INVESTMENT ALREADY
CONTRACTED TO HAPPEN
IN 2015-2018
R$ 22 BILLION
US$ 6 BILLION
SOURCE: EPE/MME/BRAZIL
Belo Monte – Transmission Line
Characteristics
DFI SuperPile 2016
Danilo Policastro
3
Belo Monte – Hydro Generation
• 3 types of guying
towers
• Up to 80 metric tons
(177k lb) of load per
guy anchor
• 800kV line
• Up to 2500km of line
double circuit DC
DFI SuperPile 2016
Danilo Policastro
4
Soil tests
DFI SuperPile 2016
Danilo Policastro 5
Helical Piles Families Used in
Brazil and General Specifications
DFI SuperPile 2016
Danilo Policastro
6
PIPES 3.5”&4.5” OD RCS 1.75”&2.0”
COMPRESSION & TENSION
LOADS
TENSION LOADS
GUY / CENTRAL TOWER /
SELF SUPPORTED TOWER
GUY ANCHORS
Helical Piles – Dimensioning
Overview
DFI SuperPile 2016
Danilo Policastro
7
QHELIX=Ah . [(c . Nc) + (q x Nq)]
Cohesive soils:
clay
Non-cohesive
soils: sand
QPILE = ∑ QHELIXES
PRODUCTIVITY:
PITCH = 3”
8 CYCLES
PER MINUTE
24”/MIN
0.6M/MIN
40MIN PER
ANCHOR
Helical Piles – Safety Factors
Considerations
• Brazil:
• Self supported towers: 1.5
• Central foundation: 1.3
• Guy: 1.1
• Latin America:
• 2 ~ 3 all foundations
DFI SuperPile 2016
Danilo Policastro
8
Other Foundation Methods for
Transmission Lines
• Auger Cast
• Drilled Shafts
• Spread Footing
• Precast piles
DFI SuperPile 2016
Danilo Policastro
9
Helical Piles x Conventional
Solutions (EPC’s View)
• 3 people per team
instalation
• 2 towers per day of
instalation
• After installed is ready
to receive the load
• High quality control
• Cost: $$
DFI SuperPile 2016
Danilo Policastro
10
Helical Piles x Conventional
Solutions (EPC’s View)
• More than 10 people per team
• 1 tower each 2 days of construction
• Need to wait 14 days to start putting load
• Quality control not always reflects what happen
• Cost: $$$$
DFI SuperPile 2016
Danilo Policastro
11
Instalation
DFI SuperPile 2016
Danilo Policastro
12
• Location: Monte
Carmelo (MG)
Field tests for helical piles
DFI SuperPile 2016
Danilo Policastro
13
Field tests for helical piles
DFI SuperPile 2016
Danilo Policastro
14
Helical Piles for Guying Towers
DFI SuperPile 2016
Danilo Policastro
15
Helical Piles for Self Supported
Towers
DFI SuperPile 2016
Danilo Policastro
16
Danilo Policastro
Latam Civil Application Engineer
dpolicastro@macleanpower.com
+55 (11) 99809-3933
Skype: danilo.policastro
MacLean Power Systems
www.macleandixie.com
DFI SuperPile 2016
Danilo Policastro
17

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DFI SuperPile 2016 - Danilo Policastro - Helical Piles

  • 1. The Use of Helical Anchors as a Foundation Solution to Build Transmission Line Towers in Brazil Danilo Policastro P.E. Latam Civil Application Engineer MacLean Power Systems DFI SuperPile 2016 Danilo Policastro 1
  • 2. Brazil Transmission Market Overview DFI SuperPile 2016 Danilo Policastro 2 INVESTMENT UNTIL 2018 R$ 70 BILLION US$ 20 BILLION 37.600 KM INVESTMENT ALREADY CONTRACTED TO HAPPEN IN 2015-2018 R$ 22 BILLION US$ 6 BILLION SOURCE: EPE/MME/BRAZIL
  • 3. Belo Monte – Transmission Line Characteristics DFI SuperPile 2016 Danilo Policastro 3
  • 4. Belo Monte – Hydro Generation • 3 types of guying towers • Up to 80 metric tons (177k lb) of load per guy anchor • 800kV line • Up to 2500km of line double circuit DC DFI SuperPile 2016 Danilo Policastro 4
  • 5. Soil tests DFI SuperPile 2016 Danilo Policastro 5
  • 6. Helical Piles Families Used in Brazil and General Specifications DFI SuperPile 2016 Danilo Policastro 6 PIPES 3.5”&4.5” OD RCS 1.75”&2.0” COMPRESSION & TENSION LOADS TENSION LOADS GUY / CENTRAL TOWER / SELF SUPPORTED TOWER GUY ANCHORS
  • 7. Helical Piles – Dimensioning Overview DFI SuperPile 2016 Danilo Policastro 7 QHELIX=Ah . [(c . Nc) + (q x Nq)] Cohesive soils: clay Non-cohesive soils: sand QPILE = ∑ QHELIXES PRODUCTIVITY: PITCH = 3” 8 CYCLES PER MINUTE 24”/MIN 0.6M/MIN 40MIN PER ANCHOR
  • 8. Helical Piles – Safety Factors Considerations • Brazil: • Self supported towers: 1.5 • Central foundation: 1.3 • Guy: 1.1 • Latin America: • 2 ~ 3 all foundations DFI SuperPile 2016 Danilo Policastro 8
  • 9. Other Foundation Methods for Transmission Lines • Auger Cast • Drilled Shafts • Spread Footing • Precast piles DFI SuperPile 2016 Danilo Policastro 9
  • 10. Helical Piles x Conventional Solutions (EPC’s View) • 3 people per team instalation • 2 towers per day of instalation • After installed is ready to receive the load • High quality control • Cost: $$ DFI SuperPile 2016 Danilo Policastro 10
  • 11. Helical Piles x Conventional Solutions (EPC’s View) • More than 10 people per team • 1 tower each 2 days of construction • Need to wait 14 days to start putting load • Quality control not always reflects what happen • Cost: $$$$ DFI SuperPile 2016 Danilo Policastro 11
  • 12. Instalation DFI SuperPile 2016 Danilo Policastro 12 • Location: Monte Carmelo (MG)
  • 13. Field tests for helical piles DFI SuperPile 2016 Danilo Policastro 13
  • 14. Field tests for helical piles DFI SuperPile 2016 Danilo Policastro 14
  • 15. Helical Piles for Guying Towers DFI SuperPile 2016 Danilo Policastro 15
  • 16. Helical Piles for Self Supported Towers DFI SuperPile 2016 Danilo Policastro 16
  • 17. Danilo Policastro Latam Civil Application Engineer dpolicastro@macleanpower.com +55 (11) 99809-3933 Skype: danilo.policastro MacLean Power Systems www.macleandixie.com DFI SuperPile 2016 Danilo Policastro 17