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Examining Tower Guy Wire Anchor Rods

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.

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Examining Tower Guy Wire Anchor Rods

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  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. How can this happen?CORROSION:Galvanic orElectrolytic

  5. Corrosion--Nature’s Way of Creating Balance

  6. The Galvanic Series

  7. Anchor Rod / Block

  8. Anchor Rod Corrosion Scenarios • Connections between unlike metals • Unlike soils--strata or backfill • Soil corrosivity--metals or concrete • Nearby underground electricity (electrolytic corrosion)

  9. Where can this happen?(unofficial survey-NUMUG, industry, consultant, Internet)

  10. 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

  11. SoundAnchor(TM)A Nondestructive Examination TechniquePatent 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

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

  13. 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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