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

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Forms for Concrete Bridge Decks 439
Job built
guardrail
Barrier reinforcing steel
Inside barrier to be erected and
concrete placed at a later date
Bracing
2nd pour
45 degree
end section
90 degree end section
with interlock
1st pour
Bolt holder
Exterior side
Bridge
overhang
bracket
B-14-A 1/2” diameter adjustable
coil bolt with free running nut or cast
wing nut. Good construction practices
dictate the use of a 1/2” cut washer between
the bolt holder and nut when a
free running nut is used. Exterior beam
Interior side
FIGURE 16-5 Overhang formwork for a bridge slab. (Source: Dayton Superior
Corporation)
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shallow steel beam. Formwork for a short overhang is illustrated in
Figure 16-6(b) for a shallow steel beam and in Figure 16-6(c) for a
shallow concrete beam.
Deck Forms Supported by Steel Joists
If bridge piers are close enough together, and if there is enough reuse
to justify the initial cost, open-web steel joists may be used to support
the forms for a concrete deck, as illustrated in Figure 16-7. At the time
a concrete cap is cast, anchors should be set for bolts to support steel
angles. The ends of the joists are supported by these angles. If necessary,
internal steel-plate fillets may be welded across the legs of the
angle to provide increased stiffness. Nailer planks should be attached
to the tops of the joists. Variable-depth wood joists may be used to
provide camber or to provide for variations in the thickness of the
concrete slab between piers.
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