Circular or generally circular prestressed concrete tank and method of constructing same

A tank of generally oval configuration having a wall created by a plurality of abutting precast wall panels, each said precast wall panel being of consistent preselected configuration utilizing a diaphragm liner, the diaphragm liner of each panel being of a generally rectangular configuration and uniform thickness, each diaphragm liner possessing a first face and a second face,

• a plurality of elongate ducts disposed in a spaced, essentially parallel relationship at locations adjacent to the second face of each said diaphragm liner, with the duct spacing being in accordance with a consistent pattern,
• concrete being utilized on a said second face of each diaphragm liner, such that the diaphragm liner as well as said ducts are covered by concrete to a substantially consistent depth,
• the concrete being shaped to an essentially consistent thickness and the surface of the concrete contoured to a finished condition, suitable for the exterior of the tank,
• said precast wall panels grouped into a tank wall of generally oval configuration, with the abutting edges of the panels spaced closely together, and all of said ducts in generally horizontal alignment,
• a horizontally disposed tensioning member extending through corresponding ducts of the several panels, and concrete utilized over the abutting edges and contoured to a finished condition,
• said tensioning members being secured in a tensioned condition to hold said panels tightly together.

A tank of generally circular configuration in having a wall created by a plurality of abutting precast wall panels,

• each said precast wall panel being of consistent curvature and configuration and utilizing a diaphragm liner of generally rectangular configuration, each diaphragm liner possessing a selected degree of arcuate curvature in one direction, thus being concave on one side and convex on the other side,
• a plurality of elongate ducts disposed in a spaced, parallel relationship at locations adjacent the convex surface of each said diaphragm liner, with the duct spacing being in accordance with a consistent pattern,
• concrete being utilized on said convex surface of each diaphragm liner, such that the diaphragm liner as well as said ducts are covered by concrete to a consistent depth,
• the concrete being shaped to an essentially consistent thickness to create a wall panel, with the surface of the concrete contoured to a finished condition, suitable for the exterior of the tank,
• said precast wall panels grouped into a circularly shaped tank wall, with the abutting edges of the panels spaced closely together, and all of said ducts in circumferential alignment,
• a circumferential tensioning member extending through corresponding ducts of the several panels, and concrete utilized over the abutting edges and contoured to a finished condition,
• said tensioning members being tensioned to hold said panels tightly together.