These heavy-duty earth anchors are used for securing poles, tower, trees, stages ... off getting them screwed into soil that is heavy in clay, or moderately rocky.
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ground-anchors-for-rocky-soil
by RL Copstead · 1990 · Cited by 17 — In rocky soils, it may be easier to make a pilot hole by using a rock bit and impact hammer. In soft soils and at shallow depths, driving a pointed rod into the soil may ... 939c2ea5af