Chapter 9 Tree support and lighting protection Flashcards
Name 3 instances in which cabling might be called for in a tree
Support a weak crotch
Support for a multi stemmed tree
Weak-wooded tree
Common grade cable is relatively malleable and easy to work with. ______- ______ - _____ cable is much stronger but less flexible than common-grade cables.
Extra-high-strength
One advantage of _______ ______ is that it’s both strong and flexible. A potential drawback is the limitation of choices for attachment.
Aircraft cable
As a general rule, cables should be installed __________ - _______ the distance from the weak branch union to the top of the tree, as long as the wood is solid and large enough to install the hardware.
2/3
Limbs may be brought closer together while installing the cable, so that when released, the cable will be just ______ .
Taut
Dead end hardware such as _______ _______ or __________ _________ can be used as anchors in smaller branches that are not decayed.
Lag eyes, lag hooks
In decayed wood, or limbs greater than 8 inches in diameter, _______ ______ or _______ ______ with ___________- _________ _________ must be used to attach cables. Used with anchor hardware.
Eye bolts, threaded rods, Amon-eye nuts
T/f when more than 1 cable is installed on the same limb, the hardware should be spaced at least as far apart as the diameter of the limb.
True
A ________ is used to form the eye at the end of a cable.
Thimble
EHS cable should be attached to hardware using _______-_______ _________.
Dead end grips
T/f the installation of metal cables, if done properly, will not wound the tree
False
The 2 types of rods commonly used to brace a tree are _______-_______ ________ are ____ ____ ________
Machine threaded rods, lag threaded rods
When bracing a tree with a machine threaded rod, the pre drilled hole should be approximately 1/16 to 1/8 in _______ than the diameter of the rod.
Larger
_________ _______ ______ or synthetic fiber, allow for more tree sway, enacting restraint only when environmental conditions demand it.
Dynamic support systems
_________ is the installation of a cable between a tree and an external anchor to provide supplemental support and reduce tree movement.
Guying
Rigid structures mounted or built on the ground to support a branch or trunk are called ————-
Props
A phenomenon in which lightning travels down the stem for a distance and then leaves the tree, jumping to a more conductive tree, structure, person or animal is called ______ _____
Side flash
The main conductor of a lightning protection system is a cable made of
Copper
If a tree has a crown radius smaller than ______ ft only one conductor is required.
35ft
Name 3 circumstances in which lightning protection for trees might be recommended
Historic, Valuable trees and trees prone to strikes within golf courses, parks, etc
2 types of steel cable used
7 strand common grade (flexible), Extra high strength (strong)
Lag hooks should not be installed in decayed wood.
True
Purpose of thimble
Protect the cable from abrasive wear and to increase cables bend radius.
Come along
Brings 2 branches closer together
The hardware should be installed in a direct line with the pull of the cable
True
If more than 1 cable is installed, keep the hardware at least one branch diameters distance apart. Do not install the hardware in vertical alignment.
True
If a tree is guyed to another tree, the guy should be attached _______ half. The guy on the supported tree should be attached ______ the midpoint. At about the height of the tree.
Lower, above, 2/3
Peen
Bending, rounding or flattening the end of through-hardware to prevent the nut from backing off.
