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29 Cards in this Set
- Front
- Back
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name three instances in which cabling might be called for a in a tree
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a. support a weak crotch
b. Support for multi-stemmed tree c. weak-wooded tree |
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common- grade cable is relatively malleable (bendable) and easy to work with. (Blank)-(Blank)-(Blank) cable is much stronger but less flexible than common- grade cables.
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extra-high-strength
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one advantage of (Blank)(Blank) is that its both strong and flexible. a potential draw back is the limiation of choices for attachement.
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aircraft cable
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as a general rule, cables should be installed (Blank)-(Blank) 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.
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two-thirds
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limbs may be brought closer together while installing the cable, so that when released, the cable will be just (Blank)
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taut
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dead-end hardware such as (Blank) or (Blank) ca be used as anchors in smaller branches that are not decayed
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lag eyes, lag hooks
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in decayed wood, or limbs greater than 8 inches in diameter, (Blank) or (Blank) with (Blank)-(Blank) (Blank) must be used to attach cables.
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eye bolts, threaded rods, amon-eye nuts
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True/ False-- When more than one cable is installed on the same limb, the hardware should be spaced at lease as far apart as the diameter of the limb.
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True
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a (Blank) is used to form the eye at the end of a cable.
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thimble
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EHS cable should be attached to hardware using (Blank)-(Blank) (Blank).
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dead-end grip
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True/ False-- the installation of metal cables, if done properly, will not wound the tree.
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false
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the two types of rods commonly used to brace a tree are (Blank)-(Blank) (Blank) and (Blank)-(Blank) (Blank)
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machine-threaded rods, lag-threaded rods
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when bracing a tree with a machine-threaded rod, the re-drilled hole should be approximately 1/16 to 1/8in (Blank) than the diameter of the rod.
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larger
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(Blank)(Blank)(Blank) allow for more tree sway, enacting restraint only when enviromental conditions demand it.
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dynamic support systems
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(Blank) is the installation of a cable between a tree and an external anchor to provide supplemental support and reduce tree movement.
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Guying
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Rigid structures mounted or built on the ground to support a branch or trunk are called (Blank)
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props
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a phenomenon in which lightning trabels down the stem for a distance and thn leaves ttree "jumpin" to a more conductive tree, structure, person, or animal is called (Blank)(Blank)
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side flash
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the main conductor of lightning protectn system is a cable made of (Blank)
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copper
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if a tree has a crown radius smaller han (Blank)ft, only one conductor is required
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35ft
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name three circumstances in which lightning protection for trees might be recommeneded.
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a. historic trees
b. valuable trees c. large trees where people may see refuge in a storm, such as a golf coarse |
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what are the differences between 7-strand, common-grade cable and extra high strength (EHS) CAble? What are the advantages and disadvantages of each?
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fill in the blank
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ideally, a cable should be installed in a tree perpendicular to the line that bisects the angle of the branch union, diagram this installation and discuss how it affects hardware installation.
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fill in the blank
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in what ways are dynamic cabling systems different from rigid systems, and what are the advantages and limitations of each?
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fill in the blank
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discuss lightning protection for a grove of several large and small trees.
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fill in the blank
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an advantage of the amon-eye over the use of an eye bolt is:
a. no washers are needed on the terminations b. the length of the rod can be adjusted c. the are considered stronger than eye bolts d. the eye bolt is not drop-forged |
b. the length of the rod can be adjusted
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the purpose of a lightning protection system is to
a. reduce the voltage of the stricke b. prevent the tree from being struck c. conduct the electrical charge into the soil away from the tree d. all of the above |
c. conduct the electrical charge into the soil away from the tree
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if two bracing rods are installed to support a weak union, they should be placed
a. no more than 4in apart b. in veritcal alignment, one above the other c. staggered, and no closer together than the diameter of the trunk d. never use more than one brace rod per crotch |
c. staggered, and no closer together than the diameter of the trunk
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if a lag hook is installed into decayed wood, the
a. decay will likely spread along the lag b. holding power will be reduced c. decay may be detedted when drilling d. all of the above |
d. all of the above
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when cabling a multi-stemmed tree, extra support can be added to the system by
a. cabling the limbs together in triangular combinations b. using double cables on each lag c. installing the cables low in the tree with turn buckles that can be tightened from the ground d. all of the above |
a. cabling the limbs together in triangular combinations
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