chair of No. 0 soft annealed iron
Figure 7-25.-Reinforcing steel for a floor slab.
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