Formwork for Concrete Structures by R.L.Peurifoy and G.D- By EasyEngineering.net

340 Chapter Eleven
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Forms for Concrete Beams
Figure 11-7 illustrates several methods of constructing forms for concrete
beams. As shown in Figure 11-7(a), the beam bottom, or soffit,
may be made from one or more dressed planks 2 in. thick and having
the required width. If more than one plank is used, they should be
cleated together on the underside at intervals of about 3 ft. The side
forms are made of plywood panels or boards, held together with 2 × 4
cleats. The ledgers attached to the vertical blocking carry the joist
load to the shore. The kickers at the bottom of the side form resist the
lateral pressure from the concrete.
The beam bottom may also be plywood, backed by dimension
lumber laid in the flat position, as illustrated in Figure 11-7(b). Plywood
panels are placed on the top of the runners to provide a continuous
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FIGURE 11-7 Forms for a concrete beam and slab.
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