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

438 Chapter Sixteen
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FIGURE 16-4 Hanger for formwork suspended from concrete beams. (Source:
Dayton Superior Corporation)
a length of pipe over the exposed end of the hanger and working the
end back and forth, similar to snap ties for wall forms.
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Wood Forms for Deck Slab Suspended from
Concrete Beams
Figure 16-4 illustrates a hanger frame designed for a precast prestressed
concrete beam. Provision is also made for forming a haunch
above the beam. The top strap is high-tensile steel and the hanger is
reinforced with bracing chairs for adequate strength on wider beams.
The design of the formwork components may be performed as illustrated
in Example 16-1.
Forms for Overhanging Deck Constructed on Exterior
Bridge Beams
Figure 16-5 illustrates a method of constructing an overhanging
deck on steel beams. The formwork hanger has two types of end
sections. A 90 o end section is used to support the formwork on the
interior side of the exterior beam, whereas a 45 o end section is used to
suspend bridge overhang brackets on the exterior side. This same
method may also be used for forming an overhang from precast prestressed
bridge beams by using a formwork hanger specially made
for concrete beams.
Figure 16-6 illustrates several methods of overhang formwork
when the bridge design will not allow the use of conventional bridge
overhang brackets. In Figure 16-6(a), a wide overhang is formed on a
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