Examining Tower Guy Wire Anchor Rods - PowerPoint PPT Presentation

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Examining Tower Guy Wire Anchor Rods

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Examining Tower Guy Wire Anchor Rods. Matthew J. Parker ... Non-Destructive Examinations Group. Westinghouse Savannah River Company. Aiken, South Carolina ... – PowerPoint PPT presentation

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Title: Examining Tower Guy Wire Anchor Rods


1
Examining Tower Guy Wire Anchor Rods
  • Matthew J. Parker
  • Atmospheric Technologies Group
  • William R. Hinz
  • Non-Destructive Examinations Group
  • Westinghouse Savannah River Company
  • Aiken, South Carolina

2
Outline Problem Corrosion Options for
Examinations SoundAnchor(TM) Long-term
protection Standards
3
Potential Problem?Anchor rod failure can lead
to tower collapse!
4
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7
How can this happen?CORROSIONGalvanic
orElectrolytic
8
Corrosion--Natures Way of Creating Balance
9
The Galvanic Series
10
Anchor Rod / Block
11
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12
Anchor Rod Corrosion Scenarios
  • Connections between unlike metals
  • Unlike soils--strata or backfill
  • Soil corrosivity--metals or concrete
  • Nearby underground electricity (electrolytic
    corrosion)

13
Where can this happen?(unofficial survey-NUMUG,
industry, consultant, Internet)
14
Excavations--Should I Dig?Common Industry
Practice
  • Negative Factors
  • Labor intensive
  • Inherently damaging
  • Inadequate visual examination
  • Safety compromised during fill removal
  • Trenching regulations
  • Difficult to repeat

15
SoundAnchor(TM)A Nondestructive Examination
Technique Patent 6,311,565 received Nov 6, 2001
  • Advantages
  • After minor initial surface preparation,
  • test is conducted quickly
  • Non-damaging
  • More thorough examination
  • Inherently safe
  • Easily repeatable
  • Trending possible
  • One-tenth of the cost of excavations

16
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19
Protection--How do I savewhat I already have?
  • Options for Protection
  • Protective coatings
  • Bituminous (carcinogenic)
  • Galvanized
  • Polymers
  • Cathodic Protection
  • Encase new rods in concrete

20
Where can I find moreinformation?
  • TIA/EIA Standard Structural Standards for Steel
    Antenna Towers and Antenna Supporting Structures
  • Reputable tower erection companies
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