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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.
A ship in the Louis Joubert Lock. The Louis Joubert Lock (French: Forme Ecluse Louis Joubert), also known as the Normandie Dock – after the large ocean liner that provided the impetus for the facility to be built, is a lock and major dry dock located in the port of Saint-Nazaire in Loire-Atlantique, northwestern France.
The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...
It works like a lock which controls the water level and allows passage of ships. The world's first enclosed wet dock with lock gates to maintain a constant water level irrespective of tidal conditions was the Howland Great Dock on the River Thames, built in 1703. The dock was merely a haven surrounded by trees, with no unloading facilities.
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 ...
Boats were admitted through double gates; the inside ones on the caisson "adjusted to fit close to those of the outer". [11] Congreve's patent then envisaged that having achieved "absolute equipoise" ( neutral buoyancy ) a rack-and-pinion , removable weights or a small winch could overcome inertia and move the caissons.
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The main problem of the dry dock that engineers were not able to keep the water from the dock out of the dry dock. The solution for making a waterproof lock gate for a dry dock was the caisson or ship-door invented in France in 1683, but this solution was not applied. In 1737 an amount of water suddenly welled up near the doors, and in 1738 the ...
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