Keep Alaska Moving through service and infrastructure

Keep Alaska Moving through service and infrastructure

What is a High Mast Tower?

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Overview

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What is a High Mast Tower?

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Overview - Foundations/Bases/Hatch

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What is a High Mast Tower?

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Overview - “Telescoped” Seams

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What is a High Mast Tower?

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Overview - Chandelier

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Tower Locations

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125 Towers Total – Anchorage Area

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Tower Locations

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125 Towers Total – Glenn Highway

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Tower Locations

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125 Towers Total – Wasilla

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Tower Locations

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125 Towers Total – North Pole

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Why Inspect?

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Iowa Collapse - Example

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Why Inspect?

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Iowa Collapse - Example

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Why Inspect?

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Iowa Collapse - Example

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Why Inspect?

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Iowa Collapse - Example

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Why Inspect?

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Minnesota & Diamond Interchange

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Inspection Plan

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• Visual Inspection of Base• Hand Torqueing Nuts• Visual Inspection of Poles

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Inspection Plan

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Drone Inspection History

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• 2014 – Test drone images bridge inspection• 2016 – Trial drone contract for mast towers • Six towers tested• Varied wide angle and normal lenses• Varied Video and still images

• 2017 – Contract of 31 towers for drone

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New Inspection Plan

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• Contract Drone Prior to Field Inspection• Preview Drone Photographs in Office• Visual Inspection of Base• Hand Torqueing Nuts• Visual Inspection of Poles• Visual Inspection of Base• Hand Torqueing Nuts• Visual Inspection of Poles*

*At predetermined locations

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Drone Inspection Plan

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• Photograph 1st quadrant with hatch• Proceed up tower w/overlapping photos• Detail specific irregularities• Proceed clockwise to next quadrant• Repeat until all quadrants are completed

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Drone Inspection Example

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Drone Inspection Example

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Conclusions

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• Better visual than previous inspections• Ability to predetermine in-depth areas• Ability to document inspections• Ability to repeat inspection• Full inventory within 4 years

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Questions?

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