Figure 7-13.-Joining wall form panels together in line.
figure 7-13. Figure 7-14 shows the form details at the
wall corner. When placing concrete panel wails and
columns at the same time, construct the wall form, as
shown in figure 7-15.
Make the wall form shorter
than the distance between the column forms to allow
for a wood strip that acts as a wedge. When stripping
the forms, remove the wedge first to aid in form
Concrete stairway forms require accurate layout
to ensure accurate finish dimensions for the stairway.
Stairways should always be reinforced with rebars
(reinforcing bars) that tie into the floor and landing.
They are formed monolithically or formed after the
concrete for the floor slab has set. Stairways formed
after the slab has set must be anchored to a wall or
beam by tying the stairway rebars to rebars projecting
from the walls or beams, or by providing a keyway in
the beam or wall. You can use various stair forms,
including prefabricated forms. For moderate-width
stairs joining typical floors, a design based on
strength considerations is generally not necessary.
Figure 7-16 shows one way to construct forms for
stair widths up to and including 3 feet. Make the
sloping wood platform that serves as the form for the
Figure 7-14.-Joining wall form panels at a corner.
Figure 7-15.-Form for panel wall and columns.
underside of the steps from 3/4-inch plywood. The
platform should extend about 12 inches beyond each
side of the stairs to support the stringer bracing
blocks. Shore up the back of the platform with 4-by-4
supports, as shown in figure 7-16. The post supports
should rest on wedges for easy adjustment and
removal. Cut 2-by-12 planks for the side stringers to
fit the treads and risers. Bevel the bottom of the
2-by-12 risers for easy form removal and finishing.
Beams and Girders
The type of construction used for beam and girder
forms depends upon whether the forms are to be
removed in one piece or whether the sides are to be
Figure 7-16.-Stairway form.