Figure 2-11. Plate anchor.
d. Screw anchors. Screw anchors (Figure 2-12) are used in fine moist, wet, or loose soils. The
10-inch (25.40 cm) and larger sizes may also be used in swampy soils. The type shown in Figure 2-12
has a square drive collar to provide a connecting surface for the special wrench used in installation.
Other types with larger eyes in the anchor rod may be installed by placing a bar through the eye in the
e. Swamp screw anchors. Swamp screw anchors (Figure 2-13) are used in swamps, bogs, and
marshes. These anchors may be used for guying lines on sandbars, river crossings, and in coastal or
seasonally flooded are. The anchors are threaded to accommodate the threaded galvanized steel pipe
that is used as the anchor rod. Extra sections of pipe may be coupled for deep installations. A thimble-
eye pipe cap is required to attach the guy strand to the anchor pipe.