The caisson rests on the bedrock and serves as the foundation of the mighty pier. To fortify this foundation, the air chamber is filled with concrete and, as the men ascend to the surface ...

The five soldiers and eight horses of the Army's Caisson Detachment halted, the U.S. Capitol on the hill, about a mile away. Wind scythed down Independence Avenue in northwest Washington under a ...

The iconic Mzimkhulu River bridge has shown signs of concrete degeneration for many years, and sagging occurred over the last three years.

During the building of James Eads' St. Louis Bridge, several of the construction workers digging out the riverbed from inside the caissons fell ill. An alarmed Eads shortened his men's working ...