Pier | Definition, Construction, Uses, & Facts | Britannica
https://www.britannica.com/technology/pier-architecture
WEBpier, in building construction, vertical loadbearing member, such as an intermediate support for adjacent ends of two bridge spans. In foundations for large buildings, piers are usually cylindrical concrete shafts, cast in prepared holes, but in bridges they take the form of caissons, which are sunk into position.
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