Abstract: The present invention relates to a disposable concrete forming apparatus. The apparatus includes an elongate, tubular and rigid form having at least one inner wall surface defining an enclosure in which concrete can be poured and allowed to harden. The apparatus further includes a flexible liner of predetermined thickness which lines the inner surface to preclude formation of form lines on the hardened concrete that correspond to markings on the inner wall surface of the rigid form. The flexible liner has at least one outside wall surface for each inner wall surface and is movable between a compressed position permitting insertion of the liner into the enclosure and a normal expanded position with the outside wall surface pressing against the inner wall surface of the rigid form. As a result, no gap is present between the inner wall surface and the outer wall surface.

Abstract: The present invention relates to a disposable concrete forming apparatus. The apparatus includes an elongate, tubular and rigid form having at least one inner wall surface defining an enclosure in which concrete can be poured and allowed to harden. The apparatus further includes a flexible liner of predetermined thickness which lines the inner surface to preclude formation of form lines on the hardened concrete that correspond to markings on the inner wall surface of the rigid form. The flexible liner has at least one outside wall surface for each inner wall surface and is movable between a compressed position permitting insertion of the liner into the enclosure and a normal expanded position with the outside wall surface pressing against the inner wall surface of the rigid form. As a result, no gap is present between the inner wall surface and the outer wall surface.