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Coffer Dam
A cofferdam is an enclosure built within a body of water to allow the enclosed area to be pumped out or drained. This pumping creates a dry working environment so that the work can be carried out safely. Cofferdams are commonly used for construction or repair of permanent dams, oil platforms, bridge piers, etc., built within water. These cofferdams are usually welded steel structures, with components consisting of sheet piles, wales, and cross braces. Such structures are usually dismantled after the construction work is completed. The origin of the word comes from ''coffer'' (originally from Latin meaning 'basket') and ''dam'' from Proto-Germanic meaning 'barrier across a stream of water to obstruct its flow and raise its level'). The term is also used in naval architecture, to refer to a space between two watertight bulkheads or decks within a ship. Uses For dam construction, two cofferdams are usually built, one upstream and one downstream of the proposed dam, afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IJsselmeer
The IJsselmeer (; , ), also known as Lake IJssel in English, is a closed-off freshwater lake in the central Netherlands bordering the Provinces of the Netherlands, provinces of Flevoland, North Holland and Friesland. It covers an area of with an average depth of . The river IJssel, after which the lake was named, flows into the IJsselmeer. The first two letters of the name are capitalized because IJ (digraph), IJ is a digraph (orthography), digraph sometimes considered a Typographic ligature, ligature in Dutch language, Dutch. History Two thousand years ago Pomponius Mela, a Ancient Rome, Roman geographer, mentioned a complex of lakes at the current location of the IJsselmeer. He called it ''Lake Flevo, Lacus Flevo''. Over the centuries, the lake banks crumbled away due to flooding and wave action, and the lake, now called the Almere (lake), Almere, grew considerably. During the 12th and 13th centuries, storm surges and sea level rise, rising sea levels flooded large areas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Causeway
A causeway is a track, road or railway on the upper point of an embankment across "a low, or wet place, or piece of water". It can be constructed of earth, masonry, wood, or concrete. One of the earliest known wooden causeways is the Sweet Track in the Somerset Levels, England, which dates from the Neolithic age. Timber causeways may also be described as both boardwalks and bridges. Etymology When first used, the word ''causeway'' appeared in a form such as "causey way", making clear its derivation from the earlier form "causey". This word seems to have come from the same source by two different routes. It derives ultimately, from the Latin for heel, , and most likely comes from the trampling technique to consolidate earthworks. Originally, the construction of a causeway used earth that had been trodden upon to compact and harden it as much as possible, one layer at a time, often by slaves or flocks of sheep. Today, this work is done by machines. The same technique w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caulking
Caulk (also known as caulking and calking) is a material used to seal joints or seams against leakage in various structures and piping. The oldest form of caulk consisted of fibrous materials driven into the wedge-shaped seams between boards on wooden boats or ships. Cast iron sewerage pipes were formerly caulked in a similar way. Riveted seams in ships and boilers were formerly sealed by hammering the metal. Modern caulking compounds are flexible sealing compounds used to close up gaps in buildings and other structures against water, air, dust, insects, or as a component in firestopping. In the tunneling industry, caulking is the sealing of joints in segmental precast concrete tunnels, commonly by using concrete. Historical uses Wooden shipbuilding Traditional caulking (also spelled calking) on wooden vessels uses fibers of cotton and oakum (hemp) soaked in pine tar. These fibers are driven into the wedge-shaped seam between planks, with a caulking mallet and a broad ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deck (ship)
A deck is a permanent covering over a Compartment (ship), compartment or a hull (watercraft), hull of a ship. On a boat or ship, the primary or upper deck is the horizontal structure that forms the "roof" of the hull, strengthening it and serving as the primary working surface. Vessels often have more than one level both within the hull and in the superstructure above the primary deck, similar to the floors of a multi-storey building, that are also referred to as decks, as are certain compartments and decks built over specific areas of the superstructure. Decks for some purposes have specific names. Structure The main purpose of the upper or primary deck is structural, and only secondarily to provide weather-tightness and support people and equipment. The deck serves as the lid to the complex box girder which can be identified as the hull. It resists Tension (physics), tension, Compression (physics), compression, and racking forces. The deck's scantling is usually the same as t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bulkhead (partition)
A bulkhead is an upright wall within the hull (watercraft), hull of a ship, within the fuselage of an airplane, or a car. Other kinds of partition elements within a ship are deck (ship), decks and deckheads. Etymology The word ''bulki'' meant "cargo" in Old Norse. During the 15th century sailors and builders in Europe realized that walls within a vessel would prevent cargo from shifting during passage. In shipbuilding, any vertical panel was called a head. So walls installed abeam (side-to-side) in a vessel's hull were called "bulkheads". Now, the term bulkhead applies to every vertical panel aboard a ship, except for the hull itself. History Bulkheads were known to the ancient Greeks, who employed bulkheads in triremes to support the back of rams. By the Athenian trireme era (500 BC), the hull was strengthened by enclosing the bow behind the ram, forming a bulkhead compartment. Instead of using bulkheads to protect ships against rams, Greeks preferred to reinforce the hull ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cofferdam TT A356
A cofferdam is an enclosure built within a body of water to allow the enclosed area to be pumped out or drained. This pumping creates a dry working environment so that the work can be carried out safely. Cofferdams are commonly used for construction or repair of permanent dams, oil platforms, bridge piers, etc., built within water. These cofferdams are usually welded steel structures, with components consisting of sheet piles, wales, and cross braces. Such structures are usually dismantled after the construction work is completed. The origin of the word comes from ''coffer'' (originally from Latin meaning 'basket') and ''dam'' from Proto-Germanic meaning 'barrier across a stream of water to obstruct its flow and raise its level'). The term is also used in naval architecture, to refer to a space between two watertight bulkheads or decks within a ship. Uses For dam construction, two cofferdams are usually built, one upstream and one downstream of the proposed dam, afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS North Carolina (BB-55)
USS ''North Carolina'' (BB-55) is the lead ship of the of fast battleships, the first vessel of the type built for the United States Navy. Built under the Washington Naval Treaty, Washington Treaty system, ''North Carolina''s design was treaty battleship, limited in displacement and armament, though the United States used a clause in the Second London Naval Treaty to increase the main battery from the original armament of twelve guns in quadruple turrets to nine guns in triple turrets. The ship was keel laying, laid down in 1937 and completed in April 1941, while the United States was still neutral during World War II. Following the Japanese attack on Pearl Harbor in December, ''North Carolina'' mobilized for war and was initially sent to counter a possible sortie by the German battleship , though this did not materialize and ''North Carolina'' was promptly transferred to the Pacific to strengthen Allied forces during the Guadalcanal campaign. There, she screened aircraft ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USS Alabama (BB-60)
USS ''Alabama'' (BB-60) is a retired battleship. She was the fourth and final member of the of fast battleships built for the United States Navy in the 1940s. The first American battleships designed after the Washington Naval Treaty, Washington Treaty system began to break down in the mid-1930s, they took advantage of an escalator clause that allowed increasing the main battery to guns, but United States Congress, Congressional refusal to authorize larger battleships kept their displacement (ship), displacement close to the Washington limit of . A requirement to be armored against the same caliber of guns as they carried, combined with the displacement restriction, resulted in cramped ships. Overcrowding was exacerbated by wartime modifications that considerably strengthened their anti-aircraft batteries and significantly increased their crews. After entering service, ''Alabama'' was briefly deployed to strengthen the British Home Fleet, tasked with protecting convoys to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Museum Ship
A museum ship, also called a memorial ship, is a ship that has been preserved and converted into a museum open to the public for educational or memorial purposes. Some are also used for training and recruitment purposes, mostly for the small number of museum ships that are still operational and thus capable of regular movement. Several hundred museum ships are kept around the world, with around 175 of them organised in the Historic Naval Ships AssociationAbout The Historic Naval Ships Association (the international Historic Naval Ships Association website. Accessed 2008-06-06.) though many are not naval museum ships, from general merchant ships to tugboat, tugs and Lightvessel, lightships. Many, if not most, museum ships are also associated with a maritime museum. Significance Relatively few ships are ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stony Island (Michigan)
Stony Island is an island in the Detroit River, in southeast Michigan. It has been used for hunting and fishing as long as humans have inhabited the region; from the mid-19th century to the mid-20th century, it was the site of a small settlement and served as a central location for the construction of the Livingstone Channel, as well as various civil engineering projects involving the Detroit River. By the 1990s, it had become completely uninhabited; it is now open to the public and administered by the Michigan Department of Natural Resources. Geography 250px, View of Stony Island from Grosse Ile in 2017 Stony Island's coordinates are and it is contained within Grosse Ile Township, in Wayne County. In the Detroit River, it is downstream of Lake St. Clair and upstream of Lake Erie. Immediately to its west is the much-larger Grosse Ile, which is approximately away; it was once connected to Grosse Ile by a railroad bridge, which was demolished by 1912. Past Grosse Ile is Tr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deepwater Horizon Oil Spill
The ''Deepwater Horizon'' oil spill was an environmental disaster off the coast of the United States in the Gulf of Mexico, on the BP-operated Macondo Prospect. It is considered the largest marine oil spill in the history of the petroleum industry and estimated to be 8 to 31 percent larger in volume than the previous largest, the Ixtoc I oil spill, also in the Gulf of Mexico. Caused in the aftermath of a blowout and explosion on the Deepwater Horizon oil platform, the United States federal government estimated the total discharge at . After Efforts to stem the Deepwater Horizon oil spill, several failed efforts to contain the flow, the well was declared sealed on 19 September 2010. Reports in early 2012 indicated that the well site was still leaking. The ''Deepwater Horizon'' oil spill is regarded as one of the largest environmental disasters in world history. A massive response ensued to protect beaches, salt marsh, wetlands and Estuary, estuaries from the spreading oil util ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
