Concrete construction form and tie rod

Claim 1

In combination: a concrete construction form for use in casting concrete, said concrete construction form having opposed faces, one of said faces defining a concrete forming surface, a top wall, a bottom wall, and planar vertical side walls, said side walls including front and rear edges and one of said side walls including a groove extending transverse to said edges and therebetween, and a bore in said groove through said vertical side wall, said bore having an axis generally parallel to said opposed faces, and said groove having a flared portion from said bore toward said rear edge; and a tie rod comprising an elongated, thin, planar metal bar having opposed faces, edges and opposite ends, and having a hole extending through at least one of said opposite ends and transverse to said opposed faces, and said bar having a reduced thickness in a plane extending transverse to the longitudinal axis of said bar and extending through one of said holes whereby said tie rod can be fractured along said plane by twisting the end of said bar, said at least one of said opposite ends positioned in said groove with said hole in said tie rod coaxially aligned with said bore, and with an end portion of said one of said ends extending into said flared portion of said groove.