any desired angle relative to the side wall portions of the framework 4 of fig1 fig4 and 5 depict detailed views to the u201c t u201d or collar coupler 36 the t collar coupler 36 includes a tubular sleeve body 110 having a longitudinal bore 112 an end collar 114 projects from the end of the sleeve body 110 and includes a pair of projecting collar arms 116 having opposed bores 118 the collar arms 116 are displaced sufficiently to spread support forces over a larger surface area of one or more interconnected pole sections 30 the displacement of the collar arms 116 also permits two butted pole sections 30 to mount within the end collar arms 116 upon aligning and butting the pole sections 30 together in the end collar 114 set screws 120 shown in dashed line or other fasteners e g hose clamp can be tightened to secure the established relative orientation of the t collar coupler 36 to the interconnected pole sections 30 alternatively the end collar 114 can be allowed to pivot about the orthogonally mounted pole section 30 mounted through the end collar 114 one or more tubular bushings 122 can be mounted between the collar arms 116 and pole section 30 to prevent abrasion and facilitate any desired pivot action in lieu of set screws a clamping band fastener 120 can be mounted to the transecting pole section 30 between the collar arms 116 to prevent rotation of the t collar coupler 36 as noted at fig1 and 2 the t collar couplers 36 are used in the truss brace sub assembly 90 and vertical support sub assembly 94 at the side wall 10 depending upon any desired mounting and when a more rigid fastening is desired.