Patent ID: 8782984

Claim:
An apparatus comprising: an elongated octagonal tubular form element, wherein the tubular form element includes a tubular boundary, wherein the boundary bounds a longitudinal interior chamber, wherein the tubular form element includes at least one female engagement portion adapted to engagingly receive a male engagement portion, wherein the at least one female engagement portion extends into the interior chamber, wherein the tubular form element includes at least one male engagement portion extending outwardly of the boundary and an insert panel, wherein the panel has at least one substantially straight or flat surface, wherein the panel has two ends and a male engagement portion at each end, and wherein each male engagement portion is adapted to engage a matching female engagement portion on the elongated tubular formwork form element whereby the engagement of the male engagement portions on the insert panel to matching female engagement portions forms a triangular closed area and whereby the engagement of the insert panel forms a substantially flat wall along elongated octagonal tubular form elements to which the insert panel is engaged.