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

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Forms for Concrete Bridge Decks 447
Adjustable Steel Forms for Bridge Decks
Commercial steel forms which are adjustable are available for forming
bridge decks. As illustrated in Figure 16-9, this forming system
may be used for steel girders or prestressed concrete bridge girders.
This system consists of two distinctively different components: the
overhang system and the interior, or girder-to-girder, system.
The interior form system rests on the bottom flange of a concrete
or steel girder, as shown in Figure 16-10. Two sets of adjustable pipe
struts support a pair of slider assemblies that carry two interior form
soffit panels and are typically 12 ft long. A T-pan is a flat plate that
makes up the variable dimension between the two interior form soffit
panels. Interior form units are set in place with a crane and are
stripped with special handling and access equipment.
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The overhang form system illustrated in Figure 16-11 has clamps
on the bottom flange of a concrete or steel girder. Structural steel
framing and walkboards create access for working the pipe struts
FIGURE 16-9 Adjustable bridge deck and overhang forming system. (Source:
Symons Corporation)
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