A water-tight inclosure, as of piles packed with clay, from which the water is pumped to expose the bottom (of a river, etc.) and permit the laying of foundations, building of piers, etc.
A barrier built in the water so as to form an enclosure from which the water is pumped to permit free access to the area within.
temporary watertight enclosure built in water and pumped dry to expose the bottom, so construction can start
large watertight chamber used for construction under water
a particular form of temporary dam used to exclude water from the site of docks, quay-walls, or the abutments of bridges during construction
a round structure that keeps the ocean out of the excavation area
a small temporary dam consisting of rockfill and granular borrow material
a sometimes temporary barrier constructed to exclude water from an area that is normally submerged
a temporary structure built to exclude water from an area otherwise flooded or waterlogged, thereby permitting excavation and construction in dry conditions
a temporary watertight enclosure constructed on the spot where a pier is to be built
a temporary, watertight enclosure that allows construction in an area normally under water
a temporary watertight enclosure that is pumped dry to expose the bottom of a body of water, so that, in this case, they would be able to access the ship
A temporary dam built to divert a river around a construction site so the dam can be built on dry ground
A temporary structure enclosing all or part of the construction area so that the construction can proceed in the dry.
A temporary dam designed to contain and divert water away from the excavation for a dam or other facility during construction. In some embankment dams the cofferdam is subsequently incoporated into the main, larger structure.
A temporary enclosing dam used to keep water out of a foundation work area during construction.
A waterproof wall, open at the top, enclosing a construction area below the water level. Compare with caisson.
A watertight sheeted pit used for construction of foundations at locations where the ground level is below water. Usually excavation is done, and piles are driven, if needed, and a thick concrete seal is placed underwater before water is pumped from a cofferdam used for bridge pier construction.
A watertight, temporary structure, for keeping the water from an enclosed area that has been pumped dry so that construction may be done.
A cofferdam is an enclosure beneath the water constructed to allow water to be displaced by air for the purpose of creating a dry work environment. Commonly used for oil rig construction and repair, bridge and dam work, the cofferdam is usually a welded steel structure that is temporary, typically dismantled after work is completed.