Title: Examining Tower Guy Wire Anchor Rods
1Examining 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
2Outline Problem Corrosion Options for
Examinations SoundAnchor(TM) Long-term
protection Standards
3Potential Problem?Anchor rod failure can lead
to tower collapse!
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7How can this happen?CORROSIONGalvanic
orElectrolytic
8Corrosion--Natures Way of Creating Balance
9The Galvanic Series
10Anchor Rod / Block
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12Anchor Rod Corrosion Scenarios
- Connections between unlike metals
- Unlike soils--strata or backfill
- Soil corrosivity--metals or concrete
- Nearby underground electricity (electrolytic
corrosion)
13Where can this happen?(unofficial survey-NUMUG,
industry, consultant, Internet)
14Excavations--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
15SoundAnchor(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
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19Protection--How do I savewhat I already have?
- Options for Protection
- Protective coatings
- Bituminous (carcinogenic)
- Galvanized
- Polymers
- Cathodic Protection
- Encase new rods in concrete
20Where can I find moreinformation?
- TIA/EIA Standard Structural Standards for Steel
Antenna Towers and Antenna Supporting Structures - Reputable tower erection companies