b. At line poles where there is a change in grade of more than 10 percent, poles are guyed with
two head guys.
c. In straight sections, storm side guys are usually placed at every 20th pole. Both storm head
and storm side guys are placed at every 40th pole.
d. The intervals (spans) separating storm guys will be specified in the detailed plan. They will
usually be shortened as the storm guys loading increases from light to medium to heavy.
e. Corner guys are installed on a line that bisects the corner angle and is opposite to the
direction of pull.
f. If the pull on a corner pole exceeds 50 feet (15.25 M), use two corner poles; if possible,
locate the guys so the corner angles at each pole are equal.
g. Install two head guys if a heavy corner must be made on one pole.
h. Use the guy rule to determine the size of guy for a particular load for a given condition (FM
11-486-5).
PART B - INSTALLING ANCHORS AND GUYS
1.
Anchors are classified as either patent or nonpatent type anchors. The patent type anchors are of
the following types: cone anchor expanding anchor, plate anchor, and screw anchor. The nonpatent
anchors are of the following types: log anchor, rock anchor, plank anchor, and concrete anchor.
a. Cone anchors. A cone anchor (Figure 2-7) is used in hardpan, crumbly damp soil, layered
rocky soil, or in any other soil where it is difficult to install other types of anchors. Crushed rock ill is
used to provide holding power for cone anchors.
b. Expanding anchor. Expanding earth anchors (Figure 2-8) may be used in most soil; however,
they cannot be expanded in rock or hardpan. The holding power of this type of anchor depends to a
blades that are forced into the side walls of the anchor hole when the anchor is expanded. These anchor
are classified as two- or four-way, according to the number of blades on the anchor. Expanding opposed
wedge rock anchors (Figure 2-9) are used as anchors in solid rock. They may also be used in layered
rock if they are concrete grouted. A rock anchor can be improvised from a 1-inch (2.54 cm) galvanized
machine bolt (Figure 2-10).
c. Plate anchors. Plate anchors (Figure 2-11) are adequate for normal guying in most soils and
do not depend on filled-in earth for holding strength. They are ideal for use where the guy forms a 45-
degree to 60-degree angle with the ground line. A special anchor rod must be used with these anchors.
2-7
SS0439
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