Guywires

Guywires are tensioned cables used to stabilize tall, slender structures by resisting wind- and load-induced movement. They are anchored well away from the base and connected to the structure at multiple points to form a triangulated restraint system. Common targets include broadcasting and cellular towers, electrical transmission towers, and wind turbine towers.

Construction typically uses galvanized or stainless-steel wire rope. Hardware such as thimbles, clamps, and turnbuckles provides secure connections and adjustable tension. Each guywire is anchored at its far end in a support such as a buried deadman, a rock anchor, or a concrete/pad anchor foundation. The anchor type is selected based on soil, rock, and environmental conditions. Attachments to the structure are made through appropriate fittings and brackets designed to withstand the expected tension and corrosion.

Layout and tension are designed to achieve a specified angle between the wire and the structure, often with multiple wires placed on different sides to counter wind from any direction. Installations require proper spacing from power lines and occupied areas, and protective measures to prevent contact or snag hazards.

Maintenance involves periodic inspection for corrosion, fraying, or damaged fittings, and re-tensioning when necessary after storms or seismic events. Safe installation and maintenance should be performed by qualified personnel under applicable codes and standards. See also stay cables, masts and towers, and tower engineering.