Patent ID: 7475651

Claim:
A structural element comprising: an internal rib and mounting structure having two end ribs, a plurality of circular intermediate ribs, and a plurality of rail members joined between adjacent coaxial intermediate ribs, between an intermediate rib on a first end and an end rib, and between an intermediate rib on a second end of said structure and an end rib, said end ribs have a plurality of mounting apertures formed therein; a cylindrical skin positioned about said internal rib and mounting structure; a cylindrical male end joint positionable within said skin having a fastening means thereon capable of joining said male end joint to said end rib of said internal rib and mounting structure, said male end joint having a plurality of mounting apertures formed longitudinally therethrough; a female end joint positionable within said skin having a fastening means thereon capable of joining said female end joint to said end rib of said internal rib and mounting structure, said female end joint having a plurality of mounting apertures formed longitudinally therethrough; and a plurality of fasteners for joining said male end joint to said end rib by extending through said male end joint mounting aperture into said end rib mounting aperture, and for joining said female end joint to said end rib by extending through said female end joint mounting aperture into said end rib mounting aperture.