Method of constructing natural draft cooling tower

Claim 1

IN THE METHOD OF FORMING A NATURAL DRAFT COOLING TOWER AND LIKE STRUCTURES HVING A BASE RING SUPPORTED ON THE GROUND BUT ABOVE GROUND LEVEL, THE STEPS WHICH COMPRISE PREFORMING CONCRETE PANEL SECTIONS WITH LEGS ATTACHED THERETO AND WITH GROOVED END FACES AT BOTH ENDS THEREOF, RAISING THE SECTIONS TO A POSITION WHERE THE LEGS SLOPE UPWARDLY AND INWARDLY TOWARD THE VERTICAL AXIS OF THE TOWER WITH THE ENDS OF THE SECTIONS IN CONFRONTING SPACED RELATION AND THE SECTIONS THEN FORMING A SUBSTANTIALLY CIRCULAR RING, TEMPORARILY SUPPORTING THE PANEL SECTIONS IN SUCH INCLINED POSITION WITH PROPS, ANCHORING THE LOWER ENDS OF THE LEGS TO A FOOTER, FILLING THE SPACES BETWEEN THE PANEL SECTIONS INCLUDING THE GROOVED END SURFACES WITH AN AIR-HARDENING CEMENTITIOUS MATERIAL TO FORM INTERLOCKING KEYS BETWEEN THE PANEL ENDS, AND REMOVING THE PROPS AFTER THE RING IS COMPLETED AND THE CEMENTITIOUS MATERIAL HAS HARDENED AND THEY ARE NO LONGER REQUIRED.