Post-tensioned prestressed pile assembly

Claim 1

A post-tensioned prestressed pile assembly comprising: a. a plurality of like, tubular shell sections arranged in vertical end-to-end relationship, b. each of said shell sections comprising a wall of uniform thickness and a bore of uniform cross-sectional area, c. the diameter of the bore of each of said tubular shell sections being substantially greater than the wall thickness, d. a combination pile driving point and anchoring plug, e. said pile driving point and anchoring plug including a main body section, the upper portion of which is reduced for insertion into an end of the lowermost shell section and the lower extremity being pointed for facility and driving the pile unit into the ground, f. an anchor positioned in said main body section, g. a head including a main body section, the lower portion of which is reduced for insertion into an end of the topmost shell section, h. a live end anchor set in the main body section of said head, i. tendon means extending longitudinally and centrally of the bores of said shell sections, j. one end of said tendon means being connected to said anchor positioned in the main body section of said pile driving point and anchoring plug, k. the opposite end of said tendon means extending through said live end anchor of said head, whereby said tendon means may be jacked for placing said tendon means under tension and said pile sections under compression, and l. spaced alignment members disposed within the bore of the shell sections and spanning the joints between adjacent shell sections, m. each of said spaced alignment members including an outer portion in frictional engagement with the walls of said shell section, n. each of said spaced alignment members further including an inner portion having bore means through which said tendon means extend, o. each of said spaced alignment members further including means connecting said outer and inner portions.