Tubular structural profile and construction system

A construction system based on a tubular structural profile that is manufactured from folding and cutting of a sheet made of a semi-rigid material comprising:

• an outer contour having 4 orthogonal sheets joined in fold lines and an inner portion, the orthogonal sheets are located diagonally joining two opposite fold lines,
• a first central portion (1) and a second central portion (2) separated by a first folding line (10),
• a first outer sheet (3) and a second outer sheet (4), the first outer sheet (3) is separated from the first central portion (1) by a second folding line (11), the second outer sheet (4) is separated from the second central portion (2) by a third folding line (12), and
• a first inner sheet (5) and a second inner sheet (6), the first inner sheet (5) is separated from the first outer sheet (3) by a fourth folding line (13), the second inner sheet is separated from the second outer sheet (4) by a fifth folding line (14);
• wherein the sheet on the third folding line (12) is rotated an angle greater than 90° to position the first and the second inner sheets (5, 6), then folding the sheet on the second and the third folding lines (11, 12), at a right angle, and then folding the first folding line (10) at a right angle;
• wherein the first and the second outer sheets (3, 4) and the first and the second inner sheets (5, 6) include a cutoff section, wherein the cutoff sections are located on the same plane;
• wherein the tubular structural profile is assembled by rotating the first and the second inner sheets about the fourth and the fifth folding lines (13, 14) at an angle greater than 90° to position the first and the second inner sheets (5, 6), then folding the second and third folding lines (11, 12) at a right angle, and then folding the first folding line (10) at a right angle;
• and inserting each tab (7) into the corresponding slot.

A cross section of a tubular structural profile manufactured by folding and cutting a sheet of semi-rigid and foldable material comprising:

• a rectangular exterior contour including 4 outer rectilinear portions, adjacent outer rectilinear portions are joined together at straight bending angles;
• and an inner portion located diagonally joining opposite bends, wherein:
• the cross section has a first, a second, a third, a fourth, a fifth, and a sixth rectilinear portions, wherein the fifth and the sixth rectilinear portions are located towards the ends of the 4 rectilinear outer portions;
• the inner portion is formed by adjacently positioning the fifth and the sixth rectilinear portions;
• wherein the bending angles have the same angle;
• wherein union between the fifth and the sixth rectilinear portions have a deflection angle greater than 90° and smaller than 180°.