• Importance of Anchors• Determining Necessary Load Capacities• Types of Anchors• Determining Holding Capacity of Soil Types• Choosing Anchors
Overview
Tower Anchoring
• 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
Anchor Types Used in Small Wind Installations
Arrowhead
Auger
Rock
Penetrator
Arrowhead Anchors
Arrowhead Installation Equipment Needed
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
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
Auger Type Anchors
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
Penetrator Anchors
Penetrator Anchor Installation
Penetrator Anchor Installation
Penetrator Anchor Installation
Expanding Rock Anchors
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
CHOOSING AN EARTH ANCHOR BASED ON SOIL TYPE
• 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
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
Soil Probe Test Kit
Soil Probe Test KitUsing the soil class chart
Guywire Attachment
Wire Clip Installation
Guywire Attachment
Thimble
Ginpole (Raising/Lowering) Anchor Attachment
Ginpole (Raising/Lowering) Anchor Attachment
Ginpole (Raising/Lowering) Anchor Attachment
Raise Tower
