| 摘要 |
A lighter weight, high strength cast screw anchor is disclosed which has a hollow, installation wrench receiving hub, a helical, load bearing element projecting outwardly from the hub, and an elongated, pointed end spade integral with and extending away from the hub. The spade has two diametrically opposed, angularly disposed cutting margins located on opposite sides of the axis of the hub. The tip section of the pointed spade is offset laterally from the hub axis, so that upon installation of the anchor, the hub and helical load bearing element move in an orbital path about the axis of the tip, whereas the spade moves in an orbital path after the helical element has been installed in the ground to a depth limiting its orbital movement. The resulting anchor may be installed in dense or frozen soils with less torque and to a greater depth than heretofore available cast screw anchors.
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