Figure 7-10.-Removing wood spreaders.
Wire ties and wooden spreaders have been largely
replaced by various manufactured devices in which
the function of the tie and the function of the spreader
are combined. Figure 7-11 shows one of these. It is
called a snap tie. These ties are made in various sizes
to tit various wall thicknesses. The tie holders can be
removed from the tie rod. The rod goes through small
holes bored in the sheathing, and also through the
wales, which are usually doubled for that purpose.
Tapping the tie holders down on the ends of the rod
brings the sheathing to bear solidly against the
You can prevent the tie holder
from coming loose by driving a duplex nail in the
provided hole. After the concrete has hardened, the tie
holders can be detached to strip the forms. After the
forms are stripped, a special wrench is used to break
off the outer sections of rods. The rods break off at
the breaking points, located about 1-inch inside the
surface of the concrete. Small surface holes remain,
which can be plugged with grout if necessary.
Another type of wall-form tie is the tie rod
(figure 7-12). This rod consists of an inner section
that is threaded on both ends and two threaded outer
sections. The inner section with the cone nuts set to
the thickness of the wall is placed between the forms,
and the outer sections are passed through the wales
and sheathing and threaded into the cone nuts. The
clamps are then threaded on the outer sections to
bring the forms to bear against the cone nuts. After
the concrete hardens, the clamps are loosened, and the
outer sections of rod are removed by threading them
out of the cone nuts. After the forms are stripped, the
cone nuts are removed from the concrete by threading
them off the inner sections of the rod with a special
wrench. The cone-shaped surface holes that remain
can be plugged with grout. The inner sections of the
rod remain in the concrete. The outer sections and the
cone nuts may be reused indefinitely.
Wall forms are usually constructed as separate
panels. Make the panels by first nailing sheathing to
the studs. Next, connect the panels, as shown in
Figure 7-11.-Snap tie.
Figure 7-12.-Tie rod.