Abstract: A preferred embodiment of the reduced skin friction bore casing is particularly suited for driving into, and removal from, soils. Preferably the bore casing is composed of a material such as steel, and includes both an exterior and interior surface that are substantially concentric about a longitudinal axis. A friction reduction coating is applied to portions of both the exterior and interior surfaces with enough strength and abrasion resistance to withstand abrasion forces applied to the bore casing during driving operations into the soils as well as extraction when required.

Abstract: A preferred embodiment of the reduced skin friction bore casing is particularly suited for driving into, and removal from, soils. Preferably the bore casing is composed of a material such as steel, and includes both an exterior and interior surface that are substantially concentric about a longitudinal axis. A friction reduction coating is applied to portions of both the exterior and interior surfaces with enough strength and abrasion resistance to withstand abrasion forces applied to the bore casing during driving operations into the soils as well as extraction when required.

Abstract: A preferred embodiment of the reduced skin friction driven sheet pile is particularly suited for driving into soils having compressible soil disposed above harder soil, with the sheet pile being configured to extend downwardly through the compressible soil into the harder soil. Preferably, the sheet pile is of formed sheet material, and incorporates an elongated opposed exterior surfaces and elongated opposed side edges which are shaped for interlocking with side edges of duplicate ones of the sheet pile. A friction reduction coating is adhered to the opposed exterior surfaces over a predetermined portion of the length of the sheet pile so that when the sheet pile is driven through the compressible soil and into the harder soil, the friction reduction coating contacts the compressible and/or harder soil and decreases the coefficient of friction between the opposed exterior surfaces of the sheet pile and the compressible and/or harder soil.