Figure 7-25.-Reinforcing steel for a floor slab.

chair of No. 0 soft annealed iron wire. Tie the bars together at frequent intervals with a snap tie to hold them firmly in position.

Steel for column ties can be assembled into cages by laying the vertical bars for one side of the column horizontally across a couple of sawhorses. The proper number of ties is slipped over the bars, the remaining vertical bars are added, and then the ties are spaced out as required by the placing plans. A sufficient number of intersections are wired together to make the assembly rigid. This allows it to be hoisted and set as a unit.

After the column form is raised, it is tied to the dowels or reinforcing steel carried up from below. This holds it firmly in position at the base. The column form is erected, and the reinforcing steel is tied to the column form at 5-foot intervals, as shown in figure 7-26.

Figure 7-26.-Securing a column with reinforcing steel against displacement.