Campbell Scientific CM110, CM115, CM120 Tripod Installation - Manual (Page 20)

Tripod Installation Manual Models CM110, CM115, CM120
FIGURE 6-7. Mechanical drawing of guy hook and case
6.1.3.1 Guy Duckbill Anchor Kits
Duckbill anchors are recommended for areas subjected to higher winds. They
allow the guy wires to be anchored at points beyond the feet, thereby
increasing the rating of the tripod for higher winds.
Two duckbill anchor kits are offered for these lightweight tripods. The 19282
Guy Duckbill Standard Anchor Kit is for standard soils, and the 25699 Guy
Duckbill Heavy Duty Kit is for aggressive soils. Aggressive soils have:
• Resistivity less than 3000 ohm-cm
• pH less than 5
• Chloride greater than 1000 ppm
• Sulfate greater than 500 ppm
• Poor aeration
The 19282 and 25699 have their own drive bar. The 19282 also has three
duckbill anchors with a cable attached to each of them. At the end of the cable
is a loop for connecting the guy wires. The 25699 has a threaded rod attached
to each of the three duckbill anchors instead of the cable. At the end of the
threaded rod is a metal ring for connecting the guy wires.
The duckbill anchors are driven to the ground at a 60-degree guy angle as
shown in FIGURE 6-8. Locate the anchors on a 7.5-ft radius for the CM115,
or a 10-ft radius for the CM120 as shown in FIGURE 6-9. Specifications for
sustained wind speed and gust tolerance are given based on guy angle, and the
ability of the anchors to hold at least 400 lbf.
Duckbill anchors are not suitable for rocky or sandy soils; UTEYE
anchors should be considered for these types of soils.
NOTE
Dead End
Load End
Lever
Hook
Phillips Screw
12