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Roadheader
A roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face. The cutting head can be a general purpose rotating drum mounted in line or perpendicular to the boom, or can be special function heads such as jackhammer-like spikes, compression fracture micro-wheel heads like those on larger tunnel boring machines, a slicer head like a gigantic chain saw for dicing up rock, or simple jaw-like buckets of traditional excavators. History The first roadheader patent was applied for by Dr. Z. Ajtay in Hungary, in 1949. It was invented as a remote operated miner for exploitation of small seam, close walled deposits, typically in wet conditions. Types Cutting Heads: * Transverse - rotates parallel to the cutter boom axis * Longitudi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Roadheader
A roadheader, also called a boom-type roadheader, road header machine, road header or just header machine, is a piece of excavating equipment consisting of a boom-mounted cutting head, a loading device usually involving a conveyor, and a crawler travelling track to move the entire machine forward into the rock face. The cutting head can be a general purpose rotating drum mounted in line or perpendicular to the boom, or can be special function heads such as jackhammer-like spikes, compression fracture micro-wheel heads like those on larger tunnel boring machines, a slicer head like a gigantic chain saw for dicing up rock, or simple jaw-like buckets of traditional excavators. History The first roadheader patent was applied for by Dr. Z. Ajtay in Hungary, in 1949. It was invented as a remote operated miner for exploitation of small seam, close walled deposits, typically in wet conditions. Types Cutting Heads: * Transverse - rotates parallel to the cutter boom axis * Longitudi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tunnel Boring Machine
A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can be designed to bore through hard rock, wet or dry soil, or sand. Tunnel diameters can range from (micro-TBMs) to to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs. TBMs can be designed to excavate non-circular tunnels, including u-shaped, horseshoe, square or rectangular tunnels. Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional "hand mining" in soil. TBMs have the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in urban areas. The major disadv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineering Vehicles
Heavy equipment or heavy machinery refers to heavy-duty vehicles specially designed to execute construction tasks, most frequently involving earthwork operations or other large construction tasks. ''Heavy equipment'' usually comprises five equipment systems: the implement, traction, structure, power train, and control/information. Heavy equipment has been used since at least the 1st century BC when the ancient Roman engineer Vitruvius described a crane in ''De architectura'' when it was powered via human or animal labor. Heavy equipment functions through the mechanical advantage of a simple machine, the ratio between input force applied and force exerted is multiplied, making tasks which could take hundreds of people and weeks of labor without heavy equipment far less intensive in nature. Some equipment uses hydraulic drives as a primary source of motion. The term "plant" is used to refer to any mobile type of heavy machinery. History The use of heavy equipment has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Confederation Line
The Confederation Line (french: Ligne de la Confédération), also called O-Train Line 1 (french: Ligne 1 de l'O-Train), is a light rail line operated by OC Transpo in Ottawa, Ontario, Canada, as part of the city's O-Train light rail system. It opened on September 14, 2019, and is O-Train's second line. It operates on an east–west route, with a segment under Queen Street in the downtown core, complementing the north–south Trillium Line that operates to the west of the downtown core. Using light rail rolling stock and technology (e.g. pantograph electrical pickup from Overhead line, overhead catenary rather than a third rail), the Confederation Line is completely grade separated. The project was approved by the Ottawa City Council and the contract was awarded in December 2012. Construction began in 2013. Mayor Jim Watson (Canadian politician), Jim Watson announced that the line would open on September 14, 2019. At a cost of just over $2.1billion, it was the largest infrastr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
City Tunnel, Malmö
A city is a human settlement of notable size.Goodall, B. (1987) ''The Penguin Dictionary of Human Geography''. London: Penguin.Kuper, A. and Kuper, J., eds (1996) ''The Social Science Encyclopedia''. 2nd edition. London: Routledge. It can be defined as a permanent and densely settled place with administratively defined boundaries whose members work primarily on non-agricultural tasks. Cities generally have extensive systems for housing, transportation, sanitation, utilities, land use, production of goods, and communication. Their density facilitates interaction between people, government organisations and businesses, sometimes benefiting different parties in the process, such as improving efficiency of goods and service distribution. Historically, city-dwellers have been a small proportion of humanity overall, but following two centuries of unprecedented and rapid urbanization, more than half of the world population now lives in cities, which has had profound consequences for g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Contra Costa Times
The ''East Bay Times'' is a daily broadsheet newspaper based in Walnut Creek, California, United States, owned by the Bay Area News Group (BANG), a subsidiary of Media News Group, that serves Contra Costa and Alameda counties, in the East Bay region of the San Francisco Bay Area. It was founded as the ''Contra Costa Times'', and took its current name in 2016 when it was merged with other sister papers in the East Bay. Its oldest merged title is the '' Oakland Tribune'' founded in 1874. History The original ''Contra Costa Times'' was founded by Dean Lesher in 1947, and served central Contra Costa County, especially Walnut Creek. However, Lesher began expanding by purchasing weekly newspapers in neighboring communities, as well as two eastern Contra Costa daily papers, the '' Antioch Ledger'' and the ''Pittsburg Post-Dispatch''. Originally the weekly newspapers were free for shoppers, but Lesher gradually converted the papers to "controlled circulation" in 1962, an aggres ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Caldecott Tunnel
The Caldecott Tunnel is an east–west highway tunnel through the Berkeley Hills between Oakland and Orinda, California. Its four bores carry California State Route 24. Named after Thomas E. Caldecott, former mayor of Berkeley, it opened in 1937 as a two-bore tunnel. The third bore opened in 1964 and the fourth bore in 2013. Currently, the two oldest bores carry eastbound traffic and the two newest bores carry westbound traffic. Description The east–west tunnel is signed as a part of California State Route 24 and connects Oakland to central Contra Costa County. It is named after Thomas E. Caldecott (1878–1951), who was mayor of Berkeley in 1930–1932, a member of the Alameda County Board of Supervisors in 1933–1945, and president of Joint Highway District 13, which built the first two bores. Bore 1 (the southernmost bore) and Bore 2 were completed in 1937; they are in length and carry two lanes each of eastbound traffic. Bore 3, completed in 1964, is in length. Bore ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addison Airport Toll Tunnel
The Addison Airport Toll Tunnel, also known as the Addison Airport Tunnel and the Addison Toll Tunnel, is part of the North Texas Tollway Authority (NTTA) system and extends Keller Springs Road under the Addison Airport property. Built for the NTTA, this toll tunnel enables vehicular traffic to travel ''under'' rather than around the airport, which expands traffic capacity and eases the notorious congestion of north Dallas and Addison by providing an east–west route between the Dallas North Tollway and Interstate 35E under the Addison Airport runway. It provides motorists a through passage on Keller Springs Road, which once ended on either side of Addison Airport, as an alternate route to the heavily traveled Belt Line Road and Trinity Mills Road. The lanes of the Addison Airport Toll Tunnel toll plaza are equipped for electronic toll collection via TollTag The North Texas Tollway Authority (NTTA) is an organization that maintains and operates toll roads, bridges, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
World Trade Center Site
The World Trade Center site, often referred to as "Ground Zero" or "the Pile" immediately after the September 11 attacks, is a 14.6-acre (5.9 ha) area in Lower Manhattan in New York City. The site is bounded by Vesey Street to the north, the West Side Highway to the west, Liberty Street to the south, and Church Street to the east. The Port Authority of New York and New Jersey (PANYNJ) owns the site's land (except for 7 World Trade Center). The original World Trade Center complex stood on the site until it was destroyed in the September 11 attacks. The Port Authority, Silverstein Properties, and the Lower Manhattan Development Corporation (LMDC) have overseen the reconstruction of the site as part of the new World Trade Center, following a master plan by Studio Daniel Libeskind. Developer Larry Silverstein holds the lease to retail and office space in four of the site's buildings. Before the World Trade Center The western portion of the World Trade Center site ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Big Dig (Boston, Massachusetts)
The Central Artery/Tunnel Project (CA/T Project), commonly known as the Big Dig, was a megaproject in Boston that rerouted the Central Artery of Interstate 93 (I-93), the chief highway through the heart of the city, into the 1.5-mile (2.4 km) tunnel named the Thomas P. O'Neill Jr. Tunnel. The project also included the construction of the Ted Williams Tunnel (extending I-90 to Logan International Airport), the Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River, and the Rose Kennedy Greenway in the space vacated by the previous I-93 elevated roadway. Initially, the plan was also to include a rail connection between Boston's two major train terminals. Planning began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007, when the partnership between the program manager and the Massachusetts Turnpike Authority ended. The Big Dig was the most expensive highway project in the United States, and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rideau Transit Group
Rideau (French for "curtain") may refer to: In or near Ottawa, Ontario, Canada Geographical features * Rideau Canal * Rideau Falls * Rideau River * Rideau Trail Towns and places *Rideau Ferry, Ontario * Rideau Lakes, Ontario *Rideau Street *Rideau Township, Ontario * Rideau View Buildings and structures *Rideau Centre *Rideau Hall * Rideau High School *Rideau Valley Clubs and organizations *Rideau Canoe Club *Rideau Club *Rideau Curling Club People with the surname * Brandon Rideau (born 1982), American football player * Iris Rideau (born c. 1937), American French Creole winemaker * Laquincy Rideau (born 1996), American basketball player * Stéphane Rideau (born 1976), French actor * Wilbert Rideau (born 1942), American convicted killer Other uses *Rideau (company), a Canada-based company providing recognition programs and products *Rideau Arcott, a Canadian breed of domestic sheep *''Rideau, Cruchon et Compotier'', a painting c. 1893 by Paul Cézanne *Rideau Park (E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Canadian Broadcasting Corporation
The Canadian Broadcasting Corporation (french: Société Radio-Canada), branded as CBC/Radio-Canada, is a Canadian public broadcaster for both radio and television. It is a federal Crown corporation that receives funding from the government. The English- and French-language service units of the corporation are commonly known as CBC and Radio-Canada, respectively. Although some local stations in Canada predate the CBC's founding, CBC is the oldest existing broadcasting network in Canada. The CBC was established on November 2, 1936. The CBC operates four terrestrial radio networks: The English-language CBC Radio One and CBC Music, and the French-language Ici Radio-Canada Première and Ici Musique. (International radio service Radio Canada International historically transmitted via shortwave radio, but since 2012 its content is only available as podcasts on its website.) The CBC also operates two terrestrial television networks, the English-language CBC Television and the Fre ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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