to it. Several types of anchor are used: Dead man anchors In this type, a hole is excavated and an object with a large surface area is placed in it with the guy wire attached, and the hole is backfilled with earth or concrete. In the historical form of dead man anchor, a log is buried horizontally in a trench with the guy attached perpendicularly to its center. Modern forms are the plate anchor, in which the guy is attached to a rod with an eyelet extending from the center of a steel plate buried diagonally, perpendicular to the angle of the guy. In the concrete anchor, a diagonal rod with an eyelet extending in the guy direction is cemented into a hole filled with steel reinforced concrete. A sufficiently massive concrete block on the surface of the ground can also be used as a dead man. Screw anchors This type consists of a rod with wide screw blades on the end and an eyelet on the other for the guy wire. It is screwed deep into the ground, at the same angle as the guy, by a truck-mounted drill machine. These are commonly used as guy anchors for utility poles since they are quick to install with a truck mounted hydraulic powered auger drive. Expanding anchors A rod with a pivoted blade on the end is driven into the earth. When the guy wire is attached and tensioned, its force pulls the blade open, "setting" it into the soil. These are often used by the military for rapid mast installations. Grouted anchors These are used in both soil and rock. A hole is drilled at the angle of the guy. A steel anchor rod with an eye is inserted, and the hole around it is filled with a liquid grout consisting of concrete and an expansion agent or a structural epoxy. When the grout hardens or expands, the anchor is secure. Guyed structures Historically, guyed structures have been some of the tallest man-made structures in the world. There are also many structures which consist of a free standing bottom and a guyed top. These are either partially guyed towers or additionally guyed towers, the latter of which may be used temporarily to support tall buildings during their construction. See also Guy (sailing) Radio masts and towers Tie rod Turnbuckle Shackle Ferrule Gin pole Bracing (aeronautics)#Bracing_wires References Cables Guyed masts