(More typically, arch bridges span less than 800 feet.) Centering under construction Constructing an arch bridge can be tricky, since the structure is completely unstable until the two spans meet ...
Arch bridges are one of the oldest types of bridges and have great natural strength. Instead of pushing straight down, the weight of an arch bridge is carried outward along the curve of the arch ...
When have three bridges opened to let another bridge pass underneath them? It happened in New Jersey Wednesday afternoon, when the first of three giant steel arch bridge sections fabricated in upstate ...