• 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

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