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These gates can be opened and closed quickly, so they are used for canal locks, to change levels, and also for most freight docks. As the function of a freight dock is to enclose deep water, such gates point inwards. A graving or dry dock, in contrast, excludes water, and so their gates point outwards.
Dry Dock № 1 194.74 33.0 9.19 * Norfolk Naval Yard: United States of America: Norfolk, Virginia Dry Dock № 8 333.0 46.0 14.6 * [105] Dry Dock № 4 308.0 44.0 13.5 * Dry Dock № 3 221.0 37.0 10.5 * Dry Dock № 2 151.3 32.06 11.4 * Dry Dock № 1 99.2 26.3 7.8 * General Dynamics Electric Boat: United States of America: Groton, Connecticut
A floating dry dock is a type of pontoon for dry docking ships, possessing floodable buoyancy chambers and a U-shaped cross-section. The walls are used to give the dry dock stability when the floor or deck is below the surface of the water. When valves are opened, the chambers fill with water, causing the dry dock to float lower in the water ...
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There was a 130 feet (40 m) wide, 463 feet (141 m) long and 20 feet (6 m) deep dry dock at the site, both the dry dock and 1913 lock were dewatered in 1977 when a sheet pile and cell closure were built blocking the upstream sides of the lock and dry dock. [2]
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Patented originally in 1912, the lockrod was first used to secure railroad boxcar doors. Today, sometimes confused with locking bars or bar locks, lockrods have evolved to secure virtually every trailer or container that has a swing door (a door that swings open and closed rather than rolls up).
The drydock, opened in 1947, was initially owned by the Government of Canada and was used to store gates, lock valves, and gate-lifting vessels. The new site was considered an improvement over the Muir Dry Dock due to its location above Lock 1, which eliminated the need for pumps to fill or empty the dry dock.
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