importance of anchors determining necessary load capacities types of anchors determining holding...
TRANSCRIPT
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• Importance of Anchors• Determining Necessary Load Capacities• Types of Anchors• Determining Holding Capacity of Soil Types• Choosing Anchors
Overview
Tower Anchoring
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• Anchors must be used to anchor the winch or griphoist when raising a tilt-up tower
• Anchors support both tilt-up guyed and freestanding guyed towers as the ground point of contact for the guy lines
Importance of AnchorsAnchor
Side Anchor Back Anchor
Side Anchor
Gin Pole Anchor
Front Anchor
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Anchor Types Used in Small Wind Installations
Arrowhead
Auger
Rock
Penetrator
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Arrowhead Anchors
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Arrowhead Installation Equipment Needed
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Arrowhead Anchor Installation
• Arrowhead is placed onto the reusable drive rod• Hammer the arrowhead into the ground at a 45˚ angle• Anchor should be driven into the ground until only a couple
inches of the cable end remains
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Setting the Arrowhead Anchor• Once anchor is at correct depth,
retrieve the drive rod
• Using the drive rod for leverage, pull on the anchor until you feel it give
• Anchor is now set and ready to be attached to guy lines
• Multiple arrowheads are typically installed per guy line anchor point to ensure non-failure
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Auger Type Anchors
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Auger Anchor Installation
• Begin spinning the auger at a 90˚ angle to the ground (straight down)
• After three or four rotations turn the auger and install at a 45˚ angle with the handle facing the tower location
• Rotate auger until less than 6 inches of the anchor handle is visible
• Use a lever and pull on anchor to ensure that it does not move
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Penetrator Anchors
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Penetrator Anchor Installation
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Penetrator Anchor Installation
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Penetrator Anchor Installation
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Expanding Rock Anchors
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http://voctec.asu.edu
Expanding Rock Anchor Installation
• Drill hole at 45˚ angle with handle facing towards tower
• Push anchor at least 12 inches into the rock
• As anchor is turned it expands into the sides of drilled holes
• Anchor can be cemented in if wanted
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CHOOSING AN EARTH ANCHOR BASED ON SOIL TYPE
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• Class 0 – Hard Pan Soil – Rock!
• Class 1 – Dense Sand & Gravel
• Class 2 – Medium Sandy Gravel
• Class 3 – Loose Medium to Fine Sand
• Class 4 – Loose Fine Uncompacted Sand
Soil Class Definitions
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Choosing an Anchor Based on Soil TypeSoil Probe Test Kit
• Soil Probe
• Wrench adaptor
• 600 lbs Torque Wrench
• ½ in to ¾ in socket adapter
• ¾ in socket
• Ratchet Wrench
• Anchor
• Soil Chart
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Soil Probe Test Kit
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Soil Probe Test KitUsing the soil class chart
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Guywire Attachment
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Wire Clip Installation
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Guywire Attachment
Thimble
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Ginpole (Raising/Lowering) Anchor Attachment
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Ginpole (Raising/Lowering) Anchor Attachment
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Ginpole (Raising/Lowering) Anchor Attachment
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Raise Tower