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An earth anchor is a device designed to support structures, most commonly used in geotechnical and construction applications. Also known as a ground anchor, percussion driven earth anchor or mechanical anchor, it may be impact driven into the ground or run in spirally, depending on its design and intended force-resistance characteristics. Earth anchors are used in both temporary or permanent applications, including supporting retaining walls, guyed masts, and circus tents. == Typical applications == Earth anchors are typically used in civil engineering and construction projects, and have a variety of applications, including: * Retaining walls, as part of erosion control systems.〔() Platipus Anchors, retrieved 2012-07-09〕 * Structural support of temporary buildings and structures,〔() Geotechnical Engineering Circular No. retrieved 2012-07-09〕 such as circus tents and outdoor stages. * Tethering marine structures, such as floating docks and pipelines. * Supporting guyed masts, such as radio transmission towers. * Anchoring utility poles and similar structures. * Drainage systems, for loadlocking and restraining capability to happen simultaneously.〔() Platipis Anchors, retrieved 2012-07-09〕 * Landscape, anchoring trees, often semi-mature transplants. .〔()〕 * General security, as in anchoring small aircraft. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Earth anchor」の詳細全文を読む スポンサード リンク
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