Abstract: Segmental shell halves of inventive subject matter are adapted to be assembled at an earth situs to form a tubular cavity drilling auger having hollow spiral flighting. The assembled tubular shell including the hollow flighting is filled with fluid, self-hardenable, cementitious material at the situs, and then drilled into the situs to given full cavity depth to be retained in the cavity as an anchored load-bearing pile or like solid column. Any number of units can be preassembled and filled with the cementitious material at a situs, ready for drilling into the earth in convenient, rapid succession, thereby to avoid costly losses experienced heretofore due to workmen and equipment awaiting possible spasmodic delivery of premixed cementitious material, for example. Unassembled hollow shell halves are adapted to be compactly stacked one within another for storage or shipping purposes.

Abstract: Means for repairing or forming structural bodies of self-hardening fluid cement mortar, in a subaqueous or other situs, utilizing a body-forming cavity including body-shaping walls of porous fabric in combination with openwork matrix means fixedly positioned at the situs. The matrix means is received within the body-shaping walls of porous fabric and connected thereto by tension-restraining tie-elements of predetermined length for controlling limited oppositely outward distension of the opposing walls away from the matrix as determined by the length of the tie-elements, upon reception of fluid mortar or like cementitious material within the body-shaping walls to expand the walls thereof to such given shape and size of the body formed by the cementitious material.

Abstract: Means for repairing or forming structural bodies of self-hardening fluid cement mortar, in a subaqueous or other situs, utilizing a body-forming cavity including body-shaping walls of porous fabric in combination with openwork matrix means. Fluid mortar or like cementitious material is pumped into the cavity to fill the same and expand the fabric walls against tensional restraint of the fixedly maintained matrix means. Pressure of fluid material may be continued against restraint of the matrix means until small proportions of the fluid material ooze through the porous fabric, which indicates attainment of a lower water-cement ratio in the formed body, after which the fluid material is allowed to set and harden to such given formed shape.

Abstract: A concrete pile or like concrete column formed in earth situs by rotating a continuous flight auger consisting of one or more sections into the earth to form a cavity of given depth; rotating the auger to remove augered earth from the cavity without removing the auger therefrom, and replacing the removed earth from the auger flights with fluid cement mortar, which hardens to form a column reinforced by the auger resultantly anchored in the same. A plurality of short auger sections may be connected together in succession during drilling to form a cavity of requisite depth by increments when low headroom conditions exist. A portion of the auger or a shaft portion without auger flighting thereon may also protrude above the earth situs for extension through water and the like and be filled with cementitious material which is allowed to harden.