Multi-panelled concrete forming structure for forming flat curved walls

In a modular concrete form structure wherein the improvement comprises a series of at least three vertically extending rows of reusable concrete form panels to be joined together in side-by-side relation as a gang in the formation of a curved concrete wall, the panels having confronting slotted panel margins about their perimeter, fasteners securing the confronting panel margins in each series in side-by-side relation, a series of spaced vertically aligned and horizontally positioned walers for said panels and being mounted in lapped engagement against said confronting slotted panel margins, said walers each having a width less than the width of a pair of the panels but exceeding the width of one of said form panels and only being of sufficient additional width to extend over joints formed between the confronting slotted panel margins at opposite sides of each panel to provide a backing, fasteners for securing the spaced vertically aligned horizontally positioned walers to the panels in each series, upright strongback structure for each series mounted in abutment against said spaced vertically aligned horizontally positioned walers generally in right angle relation thereto and tie rod fastener means securing said strongback structures with said panels thereby connecting said transversely spaced first and second rows of panels in unitary assembly in readiness for a concrete pout to form a concrete wall.