Model SS-RS - Combination Helical Cast Transition Piles Brochure

The transition section adapts type Square Shaft (SS) helical lead sections to type Round. Shaft (RS) extensions. The type RS-SS combination transition is used mainly in compression applications in areas where soft/loose soils are located above hard/ dense soils. The type RS material is less susceptible to buckling, provides greater lateral capacity, and greater moment capacity, than type SS material. A square shaft lead will allow better penetration of the helices into hard/dense material than round shaft (RS). SS reduces the occurrence of “spin-out” (loss of thrust of helices).