ANSI/TIA-1019 DRAFT - Inti

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Cantilever Height• Excessive deflections and high tension loading on leg splices aretypical concerns with cantilevers under construction
250’ Tower-Strength RequirementsCriteria Top Deflection Leg Compression Leg Tension• 54 mph wind 24 inches 14,900 lbs 13,800 lbs (61%)• Stacking Deflection 12 inches 9,200 lbs 7,100 lbs (31%)• Guy Wire Slippage 15 inches 8,100 lbs 12,000 lbs (53%)(Impact at 1.3)• Guy Wire Breakage 15 inches 12,400 lbs 18,400 lbs (82%)(Impact at 2.0)Leg Splice Tension Capacity100% Compression Capacity 22,500 lbs50% Compression Capacity 11,250 lbs33% Compression Capacity 7,500 lbs
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Tower Construction, Tower Standards
Page 3 and 4:
Historical Development of Standards
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The New Standard will incorporate t
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What is a Gin Pole• It is a devic
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Development of Gin Pole Standard•
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This was followed by full scale tes
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TR 14.7Gin Pole Sub-Committee Conce
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Advantages for the Broadcaster• A
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• 1.0 General• 2.0 Construction
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Definitions• Competent Rigger: a
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Qualified Person• Have met all th
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Rigging Plan Requirements• A rigg
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Rigging Plan ClassificationsClassDe
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Climbing Facilities• Maintain the
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Types of Hoist AnchorageLoad LineHo
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Supporting Structural Loading Durin
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Guy Wire Installation• Guy wires
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Guy Anchor Temporary Support• Sli
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Slippage Connections• When fricti
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Temporary Backup System• The back
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• Block forces transmitted to the
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Lifting Existing Loads from Structu
Page 45 and 46: Gin Pole Operation and Use• Scope
Page 47 and 48: Monitoring a Lift• Load Testing
Page 49 and 50: Tip DeflectionHelps VerifyLiftedLoa
Page 51 and 52: Changing Degrees to InchesHface
Page 53 and 54: Special Engineering Lift1. It is th
Page 55 and 56: “Special Engineered Lifts” can
Page 57 and 58: Shot Thru Transit
Page 59 and 60: Load off the Ground with Minimum Ta
Page 61 and 62: Regular Tag Situation
Page 63 and 64: Bridle Slings• Controls the stabi
Page 65 and 66: Straight and Trolley Tag Systems
Page 67 and 68: Controlling the Load Line
Page 69 and 70: • Conditions in which thestructur
Page 71 and 72: Operational and Non-Operational Win
Page 73 and 74: Tilted Gin Pole Use to be Covered
Page 75 and 76: Repairs and Modifications• Repair
Page 77 and 78: Leg Inspection Criteria• Toleranc
Page 79 and 80: Re-Use of Gin Pole Fasteners
Page 81 and 82: Bridle and Basket Forces• The gin
Page 83 and 84: Gin Pole Design Method• ASD - AIS
Page 85 and 86: Gin Pole Free Body Diagramsfor Engi
Page 87 and 88: Impact Factors for Gin Poles(Im)•
Page 89 and 90: Load Line in Center of Pole• Rest
Page 91 and 92: Rooster Head
Page 93 and 94: Track Loading and Design
Page 95: Support Conditions Affect Gin PoleC
Page 99 and 100: Guy Anchor Rod CorrosionFoundation
Page 101 and 102: Tower Failure due toAnchor Rod Corr
Page 103 and 104: Under ground and thus undetected gu
Page 105 and 106: Why does Steel Corrode?• If this
Page 107 and 108: Basic Corrosion CellInternal or Ext
Page 109 and 110: Causes of Electrical Current• Dif
Page 111 and 112: External Corrosion caused byDissimi
Page 113 and 114: Internal Corrosion caused byDissimi
Page 115 and 116: Internal Corrosion caused by dissim
Page 117 and 118: Why doesn’t hot dip galvanizing p
Page 119 and 120: How to Evaluate Corrosion Risk Prob
Page 121 and 122: Three ways to report Soil Particle
Page 123 and 124: Aggressive Soil TypesFrom Geo-Tech
Page 125 and 126: Moisture ContentFrom Geo-Tech Repor
Page 127 and 128: Hydrogen Ion Activity (pH)From Geo-
Page 129 and 130: Soils with SulfurFrom Geo-Tech Repo
Page 131 and 132: Visual and Agriculture DataWater Le
Page 133 and 134: Visual InspectionEvaluate Site Soil
Page 135 and 136: Another easy way to view soil class
Page 137 and 138: Visual InspectionBacteria sources,
Page 139 and 140: Visual InspectionLook for evidence
Page 141 and 142: National Pipeline Mapping System (N
Page 143 and 144: Soil Properties, On Site TestingMeg
Page 145 and 146: Predicting Active Corrosion Cell by
Page 147 and 148:
Predicting Active Corrosion Cell by
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• Hand digging around anchorshaft
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Limited ExcavationGround LevelMud
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Total Excavation• Expensive• Ca
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Ultrasound: Longitudinal Wave
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Ultrasound: Limited Surface Area, s
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Field Application of Longitudinal W
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Ultrasound: Shear Wave,also called
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Ultrasound: Shear WaveLoud Entry No
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Making Longitudinal Wave Work
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Limiting Factors in using Ultra Sou
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20’ x 2-1/2” dia Rod, 25% x-sec
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Ultra Sound Field Results
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Concrete Encasement• Associated P
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Associated Problems• Difficult to
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Sacrificial AnodesAssociated Proble
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A Better Sacrificial AnodeMAG-Rod b
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Summary• Corrosion begins when th
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SummaryUltra Sound is the most prom
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Construction Standards&Guy Anchor R
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ANSI/TIA-1019 DRAFT - Inti

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