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Created page with "== Definition and Purpose == A caisson in engineering is a watertight retaining structure used primarily in the construction of bridges and other structures such as dams. It is used to work on the foundations of a bridge pier, for the construction of a concrete dam, or for the repair of ships. Caissons are constructed in such a way that the water can be pumped out, keeping the work environment dry. When piers are being built using an open caisso..."