Concrete fillable wall formwork assembly with interconnectable formwork elements

1. 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.

2. The apparatus of claim 1 , wherein the male engagement portion comprises one or more of an engagement fin, projection, finger or lip.

3. The apparatus of claim 2 , wherein the male engagement portion is T-shaped, P-shaped, H-shaped, or Y-shaped.

4. The apparatus of claim 2 , wherein the panel has one substantially straight or flat surface and is a formwork wall panel.

5. The apparatus of claim 1 , wherein the panel has two substantially straight or flat surfaces residing at a perpendicular angle relative to each other and is a formwork corner panel.

6. The apparatus of claim 3 , wherein the panel has perforations.

7. The apparatus of claim 4 , wherein the panel has perforations.

8. The apparatus of claim 4 , wherein the apparatus forms walls of a building.

9. An apparatus comprising:

an octagonal form element,

wherein the form element includes a wall substantially surrounding an interior space,

wherein the wall includes at least one opening,

wherein the wall includes at least one inwardly extending recessed female engagement portion,

wherein the at least one female engagement portion is adapted to receive a male engagement portion,

wherein the wall includes at least one outwardly extending male engagement portion, 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 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 octagonal form elements to which the insert panel is engaged.

10. The apparatus of claim 9 , wherein the male engagement portion comprises one or more of an engagement fin, projection, finger or lip.

11. The apparatus of claim 10 , wherein the male engagement portion is T-shaped, P-shaped, H-shaped, or Y-shaped.

12. The apparatus of claim 10 , wherein the panel has one substantially straight or flat surface and is a formwork wall panel.

13. The apparatus of claim 10 , wherein the panel has two substantially straight or flat surfaces residing at a perpendicular angle relative to each other and is a formwork corner panel.

14. The apparatus of claim 11 , wherein the panel has perforations.

15. The apparatus of claim 12 , wherein the panel has perforations.

16. The apparatus of claim 12 , wherein the apparatus forms walls of a building.

17. A formwork assembly adapted to receive concrete in forming structures, comprising:

a plurality of longitudinally elongated octagonal PVC form elements,

wherein each form element includes a longitudinal axis,

wherein each form element includes a longitudinal interior space,

wherein each form element includes a longitudinal open face,

wherein each form element includes a plurality of substantially flat exterior wall surfaces,

wherein each wall surface is angled relative to an adjacent wall surface,

wherein each form element includes a plurality of longitudinal female engagement portions,

wherein each female engagement portion joins two adjacent wall surfaces, wherein each female engagement portion is closed to the interior space,

wherein each female engagement portion is adapted to receive a male engagement portion,

wherein each form element includes a plurality of longitudinal male engagement portions,

wherein each male engagement portion extends outwardly from a wall surface,

wherein each male engagement portion is adapted to be received by each female engagement portion,

a plurality of longitudinally elongated PVC wall panels,

wherein each wall panel includes a substantially flat exterior wall surface,

wherein each wall panel includes a first end and a second end,

wherein each wall panel end includes a wall panel male engagement portion, wherein each wall panel male engagement portion is adapted to be received by each female engagement portion,

a plurality of longitudinally elongated PVC corner panels,

wherein each corner panel includes substantially perpendicular exterior wall surfaces,

wherein each corner panel wall surface is substantially flat,

wherein each corner panel includes a first end and a second end,

wherein each corner panel end includes a corner panel male engagement portion,

wherein each corner panel male engagement portion is adapted to be received by each female engagement portion,

wherein the form elements and wall panels and corner panels are adapted to be interconnected to form a formwork having a substantially flat exterior wall surface.