In engineering, a type of foundation most commonly used underwater for a bridge, but sometimes used in building construction. It is a large hollow structure that is sunk down through the earth by workers excavating from inside it; ultimately it becomes a permanent part of the pier. There are three types: the open caisson, open at both top and bottom; the box caisson, closed at the bottom; and the pneumatic caisson, with an airtight chamber to accommodate submerged workers. Caisson columns, typically 2 ft (0.6 m) or more in diameter, may be used as an alternative to bearing piles. A round hole is dug or bored to a stable layer of earth and temporarily supported by a steel shell, then filled with concrete poured around a cage of reinforcing bars
A structure or chamber which is usually sunk or lowered by digging from the inside Used to gain access to the bottom of a stream or other body of water
(1) A watertight structure within which construction work is carried on under water (2) A large box open at the top and one side, designed to fit against the side of a ship and used to repair damaged hulls under water (3) A floating structure used to close off the entrance to a dock or canal lock Also referred to as a Camel
A 10 or 12 diameter hole drilled into the earth and embedded into bedrock 3 4 feet The structural support for a type of foundation wall, porch, patio, monopost, or other structure Two or more sticks of reinforcing bars (rebar) are inserted into and run the full length of the hole and concrete is poured into the caisson hole