A 10 inch or larger size can be used in swampy soils with which anchor type?

Study for the BICSI OSP Design Test. Prepare using multiple choice questions, with hints and explanations to enhance understanding. Succeed in your exam journey!

In swampy soils, select an anchor that gains its holding power through mechanically cutting into and gripping soft, wet substrate rather than relying on firm bearing or expansion in place. A screw anchor, especially at a large diameter like 10 inches or more, does exactly that. The helical blades bite into the soil as the anchor is rotated in, increasing embedment and contact area to resist uplift even when the ground is soft and saturated. The larger diameter boosts the available pullout resistance, making it well-suited for challenging, mucky conditions.

Expansion anchors require a solid substrate to expand against, which swampy, waterlogged soils don’t provide reliably. Cone anchors depend on soil friction along a conical surface, which can be insufficient in soft, yielding mud. Plate anchors rely on spreading plates to generate resistance, which also performs poorly when the surrounding soil can’t provide solid friction or resistance.