| 摘要 |
An earth anchor apparatus includes a hub having a longitudinal axis and first and second axial ends, and a load-bearing helix affixed to the hub. The load-bearing helix includes a generally radially extending leading edge adjacent the first end of the hub, a generally radially extending trailing edge adjacent the second end of the hub, an inner circumferential section connected to the hub, and an outer circumferential section extending radially outward from the inner circumferential section and having an outer circumferential edge separated from the inner section. A pair of opposed surfaces extend between the inner section and the outer edge and define a thickness of the helix. The thickness of the helix at the trailing edge is greater adjacent the inner circumferential section than at the outer circumferential edge, and the thickness of the helix adjacent the inner circumferential section is greater at the trailing edge of the helix than at the leading edge. In this manner, material is removed from areas of the helix where less loading stress develops during installation and use of the anchor while material is added to areas of higher loading stress.
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