two trusses are connected together for a high wall pour the rigidifying members of adjacent trusses are connected together by a rigid rod 140 as will now be explained the rigidifying members 44 and 66 which are preferably of tubular stock of square cross section are sized to receive the ends of the rod 140 in telescoped relation each rod 140 is of a length such that in assembly its upper and lower ends 142 and 144 are receivable in the column of the associated rigidifying member the rods are bolted in place as at 146 in fig3 see also at 147 and 148 in fig1 for this purpose the rods are provided with holes 150 and 152 at predetermined locations also as seenin fig3 and 12 a hole 154 is provided intermediate the rod length for passage of a safety line between the bars of adjacent trusses to provide a safety railing for workmen to stand or walk on planks 156 and 158 shown in dotted lines in fig1 the rod 140 39 when used as shown in fig1 becomes a port for a railing preferably to connect the angle pieces of the trusses together cylindrical spacer members 160 162 and 164 and 166.