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Air Draft
Air draft (or air draught) is the vertical distance from the surface of the water to the highest point on a vessel. This is similar to the '' deep draft'' of a vessel which is measured from the surface of the water to the deepest part of the hull below the surface. However, air draft is expressed as a height (positive upward), while deep draft is expressed as a depth (positive downward). Clearance below The vessel's clearance is the distance in excess of the air draft which allows a vessel to pass safely under a bridge or obstacle such as power lines, etc. A bridge's "clearance below" is most often noted on charts as measured from the surface of the water to the underside of the bridge at the chart datum Mean High Water (MHW), a less restrictive clearance than Mean Higher High Water (MHHW). In 2014, the United States Coast Guard reported that 1.2% of the collisions that it investigated in the recent past were caused by vessels attempting to pass under structures with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Allanburg Bridge
Bridge 11, also known as the Allanburg Bridge, is a vertical-lift bridge over the Welland Canal within the City of Thorold and community of Allanburg, Ontario, Canada. The location was used for the groundbreaking ceremony for the canal. It was constructed and completed in 1930. The bridge carries Hwy 20 connecting Niagara Falls to Fonthill. The bridge has a main span. It was designed by Harrington, Howard & Ash, the predecessor of HNTB. It was rehabilitated in 2001 and is a through-truss vertical-lift bridge A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck. The vertical lift offers several benefits over other movable bridges such as the bascule and swi ... with clearance for shipping. On August 11, 2001, the bridge was struck by the MS Windoc (1959) when the lift span was lowered before the ship cleared the structure. The ship caught fire. After minor repairs to the brid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Panama Canal Expansion Project
The Panama Canal expansion project (), also called the Third Set of Locks Project, doubled the capacity of the Panama Canal by adding a new traffic lane, enabling more ships to transit the waterway, and increasing the width and depth of the lanes and locks, allowing larger ships to pass. The new ships, called New Panamax, are about one and a half times larger than the previous Panamax size and can carry over twice as much cargo. The expanded canal began commercial operation on 26 June 2016. The project has: * Built two new sets of locks, one each on the Atlantic and Pacific sides, and excavated new channels to the new locks * Widened and deepened existing channels * Raised the maximum operating water level of Gatun Lake''Proposal for the E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bridge Strike
Bridge strike or tunnel strike (also known as bridge bashing) is a type of transport accident in which a vehicle collides with a bridge, overpass, or tunnel structure. Bridge-strike road accidents, in which an over-height vehicle collides with the underside of the structure, occur frequently and are a major issue worldwide. In waterways, the term encompasses water vessel–bridge ship collision, collisions, including bridge span and support structure collisions. Impacts In United Kingdom, railway bridge strikes (called "bridge bashing") happen on an average of once every four and a half hours, with total of 1789 times in 2019. Several bridges have been hit over 20 times in a single year. The total cost borne by the state was around £23 million. In Beijing, China, 20% of all bridge damages are caused by bridge strikes. Texas Department of Transportation estimated in 2013 that an average cost to repair a bridge strike is $180,000 USD. Even without damages to the bridges, the strike ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chart Datum
A chart datum is the water surface serving as origin (or coordinate surface) of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. Common chart datums are ''lowest astronomical tide'' (LAT)Australian Bureau of MeteorologNational Tide Centre Glossary(retrieved 30 April 2013) and ''mean lower low water'' (MLLW). In non-tidal areas, e.g. the Baltic Sea, mean sea level (MSL) is used. A chart datum is a type of vertical datum and must not be confused with the horizontal datum for the chart. However, it is necessarily an equigeopotential (a water "level surface"): the chart datum is tilted across smaller to larger tidal range regions; in rivers, it is a sloping and undulating surface following the low stage. Definitions The following tidal phases are commonly used in the definition of chart datums. Lowest and highest astronomical tide ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cargo Ship
A cargo ship or freighter is a merchant ship that carries cargo, goods, and materials from one port to another. Thousands of cargo carriers ply the world's List of seas, seas and Ocean, oceans each year, handling the bulk of international trade. Cargo ships are usually specially designed for the task, often being equipped with crane (machine), cranes and other mechanisms to load and unload, and come in all sizes. Today, they are almost always built of Welding, welded steel, and with some exceptions generally have a life expectancy of 25 to 30 years before being scrapped. Definitions The words ''cargo'' and ''freight'' have become interchangeable in casual usage. Technically, "cargo" refers to the goods carried aboard the ship for hire, while "freight" refers to the act of carrying of such cargo, but the terms have been used interchangeably for centuries. Generally, the modern ocean shipping business is divided into two classes: # Liner business: typically (but not exclusive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tower Bridge
Tower Bridge is a Listed building#Grade I, Grade I listed combined Bascule bridge, bascule, Suspension bridge, suspension, and, until 1960, Cantilever bridge, cantilever bridge in London, built between 1886 and 1894, designed by Horace Jones (architect), Horace Jones and engineered by John Wolfe Barry with the help of Henry Marc Brunel. It crosses the River Thames close to the Tower of London and is one of five London bridges owned and maintained by the City Bridge Foundation, a charitable trust founded in 1282. The bridge was constructed to connect the 39 per cent of London's population that lived east of London Bridge, equivalent to the populations of "Manchester on the one side, and Liverpool on the other", while allowing shipping to access the Pool of London between the Tower of London and London Bridge. The bridge was opened by Edward VII, Edward, Prince of Wales, and Alexandra of Denmark, Alexandra, Princess of Wales, on 30 June 1894. The bridge is in length including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structure Gauge
A structure gauge, also called the minimum structure outline, is a diagram or physical structure that sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. It specifies the height and width of station platforms, tunnels and bridges, and the width of the doors that allow access to a warehouse from a rail siding. Specifications may include the minimum distance from rail vehicles to railway platforms, buildings, lineside electrical equipment cabinets, signalling equipment, third rails or supports for overhead lines. A related but separate gauge is the loading gauge: a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. The difference between these two gauges is called the clearance. The specified amount of clearance makes allowance for wobbling of rail vehicles at speed or the shifting of vehicles on curves; consequently, in some circumstances a train may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineering Tolerance
Engineering tolerance is the permissible limit or limits of variation in: # a physical dimension; # a measured value or physical property of a material, manufactured object, system, or service; # other measured values (such as temperature, humidity, etc.); # in engineering and safety, a physical distance or space (tolerance), as in a truck (lorry), train or boat under a bridge as well as a train in a tunnel (see structure gauge and loading gauge); # in mechanical engineering, the space between a bolt and a nut or a hole, etc. Dimensions, properties, or conditions may have some variation without significantly affecting functioning of systems, machines, structures, etc. A variation beyond the tolerance (for example, a temperature that is too hot or too cold) is said to be noncompliant, rejected, or exceeding the tolerance. Considerations when setting tolerances A primary concern is to determine how wide the tolerances may be without affecting other factors or the outcome of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bayonne Bridge
The Bayonne Bridge is an Through arch bridge, arch bridge that spans the Kill Van Kull between Staten Island, New York (state), New York, and Bayonne, New Jersey, Bayonne, New Jersey, United States. It carries New York State Route 440 and New Jersey Route 440, with the two roads connecting at the state border at the river’s center. It has the List of longest arch bridge spans, sixth-longest steel arch mainspan in the world, the longest in the world at the time of its completion. The bridge is also one of four connecting New Jersey with Staten Island; the other two roadway bridges are the Goethals Bridge in Elizabeth, New Jersey, Elizabeth and Outerbridge Crossing (which also carries Route 440) in Perth Amboy, New Jersey, Perth Amboy, and the rail-only span is the Arthur Kill Vertical Lift Bridge, all of which cross the Arthur Kill. The original four-lane roadway was designed for the Port Authority of New York and New Jersey by Swiss master bridge-builder Othmar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suez Canal Bridge
The Suez Canal Bridge, also known as the Egyptian–Japanese Friendship Bridge, Al Salam Bridge, Al Salam Peace Bridge or Mubarak Peace Bridge, is a road bridge crossing the Suez Canal at El-Qantara, whose name means "the peace" in Egyptian Arabic. The bridge links the continents of Africa and Asia. Design and construction The bridge was built with assistance from the Japanese government. The main contractor was Kajima, Kajima Corporation. The Japanese grant, accounting for 60% of the construction cost (or 13.5 billion yen), was agreed to during the visit of then-President Hosni Mubarak to Japan in March 1995, as part of a larger project to develop the Sinai Peninsula. Egypt bore the remaining 40% (9 billion yen). The bridge was opened in October 2001. The bridge, which has a clearance over the canal and is long, consists of a cable-stayed main span and two long approach spans. The height of the two main pylons supporting the main span is each. The towers were designed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Container Ship
A container ship (also called boxship or spelled containership) is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. Container ships are a common means of commercial intermodal freight transport and now carry most seagoing non-bulk cargo. Container ship capacity is measured in twenty-foot equivalent units (TEU). Typical loads are a mix of 20-foot (1-TEU) and 40-foot (2-TEU) ISO-standard containers, with the latter predominant. Today, about 90% of non-bulk cargo worldwide is transported by container ships, the largest of which, from 2023 onward, can carry over 24,000 TEU. History There are two main types of dry cargo: bulk cargo and break bulk cargo. Bulk cargoes, like grain or coal, are transported unpackaged in the hull of the ship, generally in large volume. Break-bulk cargoes, in contrast, are transported in packages, and are generally manufactured goods. Before the advent of containerization in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Belt Fixed Link
The Great Belt Bridge () or Great Belt fixed link () is a multi-element fixed link crossing the Great Belt strait between the Danish islands of Zealand and Funen. It consists of a road suspension bridge and a railway tunnel between Zealand and the small island Sprogø in the middle of the Great Belt, and a box-girder bridge for both road and rail traffic between Sprogø and Funen. The total length is . The term ''Great Belt Bridge'' commonly refers to the suspension bridge, although it may also be used to mean the box-girder bridge, especially when discussing the railway, or the link in its entirety. Officially named the East Bridge, the suspension bridge was designed by the Danish firms COWI and Ramboll, and the architecture firm Dissing+Weitling. The construction and assembly of the suspended deck were carried out by the compan Alsthom Sdemwith the consultancy of the ItaliaStudio de Miranda Associatiunder the direction of Mario de Miranda. It has the world's seventh- lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
