107 structural members 101 and 102 have each have openings 303 at locations along each structural member where a torsion structural member lock may be placed not necessarily just at the ends of the members further structural members 101 and 102 may be of any required length for construction the structural members may be assembled using a torsion structural locking block at any desired linear angle including 180 degrees in one embodiment the angle of construction of the structural members is set by the construction of the torsion structural member locks for example a 90 degree angle would require a 90 degree torsion structural member lock fig4 is a perspective view of a torsion locking block 103 of fig1 according to an embodiment of the invention torsion locking block 103 may be manufactured of steel wood fiberglass or other construction materials locking block 103 in this example is quadrilateral in shape having 4 sides a top surface and a bottom surface sides 402 and 404 are the sides that interface with structural members sides 406 and 405 do not interface with structural members opposing sides of structural member block 103 are substantially parallel to each other as are the top and bottom surfaces in one embodiment torsion locking block 103 is of a solid construction in another embodiment locking block 103 may be manufactured of separate components that fit together to function as one piece one or more openings 407 are provided at or around the approximate center of locking block 103 extending from side 402 through side 404 opening 407 is a through bore and has a diameter sufficiently large for accepting the tensioning rod.