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

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Forms for Concrete Bridge Decks 449
Adjustable
chamber
Fixed steel
chamber
Slab edge form
Steel soffit panel
Shoe
clamp
Shoe
Overhang form
type IV girder
Overhang form
steel girde
(a) Overhang system for steel girders
(b) Overhang system for concrete girder
FIGURE 16-11 Overhang form system for bridge decks. (Source: Symons Corporation)
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and types. Simple and quick clamping attachment shoes allow fast
setting and stripping in typical 12-ft modules with a small crew.
Overhang forms strip and set complete with slab edge forms,
hand rail posts, and lower personnel access scaffolding by crane as
one unit. The slab edge form is adjustable so that the form face will be
plumb even on superelevated curves.
All-Steel Forms for Bridge Structures
Modular all-steel forms are available for forming bridges, as illustrated
in Figure 16-12. This forming system, manufactured by EFCO,
has the ability to be self-supporting and self-spanning. The steel
ribs on the form panels serve two purposes: as web stiffeners and as
beams to transfer the horizontal pressures of the liquid concrete from
the form face plate to the form panel top and bottom flanges.
This form system is available in modular lengths that can be
bolted together easily, which provides flexibility for changing job
conditions. The self-supporting ability of this forming system enables
the contractor to pour aerial concrete without shoring between
spans.
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