Steel-concrete combination element for lining vessels such as storage tanks, prestressed concrete reactor pressure vessels, and the like

Claim 1

A self-supported compound element of steel and concrete for joining to similar elements for lining containers, including a steel plate base member, a plurality of individual anchoring means fixed on one surface of said plate, a rim along at least one edge of said plate and fixed on the same surface as said anchoring means, concrete cast on said surface of said plate and having a surface substantially parallel with the plate surface with said anchoring means extending into said concrete and said rim confining said concrete along said edge, certain of said anchoring means extending above said concrete surface and said rim, said rim having flanges projecting laterally outwardly on the side opposite said concrete to form one-half of a hollow formation, the rim formed with flanges for engaging flanges of an adjoining element to form a closed hollow space between the elements when welded together along said flanges, so the welding seams may be inspected when said elements are assembled to form a lining.