2. Precast prestressed concrete girder bridges
Precast prestressed concrete girder bridges are often very economical, for spans of up to 30 m with prestressed pre-tensioning, and for spans of between 30 and 50 m with prestressed post-tensioning. The greater the number of beams to be built, the more attractive they are, as the appropriate means of installation are easily justified.
2.1 Post-tensioned girder bridges
The beams, of the "heel beam" type, are held together by the slab under the roadway and by spacers located at the ends of each span, in line with the support lines, which ensure the torsional embedding of the beams and enable the deck to be lifted using jacks to change the support devices when necessary. Intermediate bracing has long since fallen out of fashion, because, although...
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Precast prestressed concrete girder bridges
Pre-stressed concrete cantilever bridges
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