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Tunnel Boring Machines
A tunnel boring machine (TBM), also known as a "mole" or a "worm", is a machine used to excavate tunnels. TBMs are an alternative to drilling and blasting methods and "hand mining", allowing more rapid excavation through hard rock, wet or dry soil, or sand (although each requires specialized TBM technologies). TBM-bored tunnel cross-sections extend up to (through June 2023). TBM tunnels are typically circular in cross-section, but may also be square or rectangular, or U- or horseshoe-shaped. Much narrower tunnels are typically bored using Trenchless technology, trenchless construction methods or directional boring, horizontal directional drilling rather than by TBMs. TBMs limit disturbance to the surrounding ground and produce a smooth tunnel wall, which reduces the cost of lining the tunnel; it also allows for tunneling in urban areas. Large TBMs are expensive and challenging to construct and transport, fixed costs which become less significant for longer tunnels. Tunneling ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
LEAD
Lead () is a chemical element; it has Chemical symbol, symbol Pb (from Latin ) and atomic number 82. It is a Heavy metal (elements), heavy metal that is density, denser than most common materials. Lead is Mohs scale, soft and Ductility, malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when exposed to air. Lead has the highest atomic number of any stable nuclide, stable element and three of its isotopes are endpoints of major nuclear decay chains of heavier elements. Lead is a relatively unreactive post-transition metal. Its weak metallic character is illustrated by its Amphoterism, amphoteric nature; lead and lead oxides react with acids and base (chemistry), bases, and it tends to form covalent bonds. Lead compounds, Compounds of lead are usually found in the +2 oxidation state rather than the +4 state common with lighter members of the carbon group. Exceptions are mostly limited ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alps
The Alps () are some of the highest and most extensive mountain ranges in Europe, stretching approximately across eight Alpine countries (from west to east): Monaco, France, Switzerland, Italy, Liechtenstein, Germany, Austria and Slovenia. The Alpine arch extends from Nice on the western Mediterranean Sea, Mediterranean to Trieste on the Adriatic Sea, Adriatic and Vienna at the beginning of the Pannonian Basin. The mountains were formed over tens of millions of years as the African and Eurasian tectonic plates collided. Extreme shortening caused by the event resulted in marine sedimentary rocks rising by thrust fault, thrusting and Fold (geology), folding into high mountain peaks such as Mont Blanc and the Matterhorn. Mont Blanc spans the French–Italian border, and at is the highest mountain in the Alps. The Alpine region area contains 82 peaks higher than List of Alpine four-thousanders, . The altitude and size of the range affect the climate in Europe; in the mountain ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liverpool
Liverpool is a port City status in the United Kingdom, city and metropolitan borough in Merseyside, England. It is situated on the eastern side of the River Mersey, Mersey Estuary, near the Irish Sea, north-west of London. With a population of (in ), Liverpool is the administrative, cultural and economic centre of the Liverpool City Region, a combined authority, combined authority area with a population of over 1.5 million. Established as a borough in Lancashire in 1207, Liverpool became significant in the late 17th century when the Port of Liverpool was heavily involved in the Atlantic slave trade. The port also imported cotton for the Textile manufacture during the British Industrial Revolution, Lancashire textile mills, and became a major departure point for English and Irish emigrants to North America. Liverpool rose to global economic importance at the forefront of the Industrial Revolution in the 19th century and was home to the Liverpool and Manchester Railway, firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Birkenhead
Birkenhead () is a town in the Metropolitan Borough of Wirral, Merseyside, England. The town is on the Wirral Peninsula, along the west bank of the River Mersey, opposite Liverpool. It lies within the Historic counties of England, historic county boundaries of Cheshire, and became part of Merseyside in 1974. At the 2021 United Kingdom census, 2021 census, the built up area as defined by the Office for National Statistics had a population of 109,835. Birkenhead Priory and the Mersey Ferry were established in the 12th century. In the 19th century, Birkenhead expanded greatly as a consequence of the Industrial Revolution, leading to a shipbuilding firm which became Cammell Laird. A Great Float, seaport was established. As the town grew, Birkenhead Park and Hamilton Square were laid out. The first street tramway in Britain was built, followed by the Mersey Railway which connected Birkenhead and Liverpool through the world's first railway tunnel beneath a tidal estuary. In the sec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sangatte
Sangatte (; ) is a Communes of France, commune in the Pas-de-Calais Departments of France, department on the northern coast of France on the English Channel. The name is of Flemish origin, meaning hole or gap in the sand. Engineering Sangatte is the location for the Channel Tunnel's French cooling station, its British counterpart being at Samphire Hoe. In addition, it is the French end-point for the HVDC Cross-Channel, the connection between the UK and French electricity grids. History First underwater telegraph Sangatte was the landing point of the world's first operational underwater telegraph cable, laid across the Channel by the Submarine Telegraph Company in 1851 between South Foreland and Sangatte. Pioneering cross-Channel flight 'Blériot-Plage' is named to commemorate Louis Blériot who, on 25 July 1909, was the first person to fly across the English Channel. He flew from the beach at Sangatte to the White Cliffs of Dover, to claim the prize offered by the Daily Mail. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Suez Canal Company
Suez (, , , ) is a seaport city with a population of about 800,000 in north-eastern Egypt, located on the north coast of the Gulf of Suez on the Red Sea, near the southern terminus of the Suez Canal. It is the capital and largest city of the Suez Governorate. It has three ports: the Suez Port (Port Tewfik), al-Adabiya, and al-Zaytiya, and extensive port facilities. Together, the three cities form the Suez metropolitan area, located mostly in Africa with a small portion in Asia. Railway lines and highways connect the city with Cairo, Port Said, and Ismailia. Suez has a petrochemical plant, and its oil refineries have pipelines carrying the finished product to Cairo. These are represented in the flag of the governorate: the blue background refers to the sea, the gear refers to Suez's status as an industrial governorate, and the flame refers to the petroleum firms of Suez. The modern city of Suez is a successor of the ancient city of Clysma, a major Red Sea port and a center ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alexandre Lavalley
Alexandre-Théodore Lavalley, (October 9, 1821 – July 20, 1892) was an engineer and French politician. Paul Borel and Lavalley were contractors of the Suez Canal Company who designed, built, and operated the dredging machines that finished excavation of the Suez Canal from 1864 to 1869 after the use of forced labor was disallowed. Biography Education Alexandre Lavalley finished his preparatory studies in Tours, entered the École Polytechnique and left after studying military engineering in 1842. He resigned his commission and spent a few years in England, where he became a mechanic and acquired practical knowledge about machinery. Engineering career Photo of a dredge machine taken circa 1870 Upon returning to France, he joined Ernest Goüin & Cie, a company that built locomotives, where he was trusted to manage the locomotive plants. He also designed lighthouses on the Black Sea, created a tunnel boring machine in Lithuania, and created a machine to dredge ports in Russi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Parliament
The Parliament of the United Kingdom of Great Britain and Northern Ireland is the supreme legislative body of the United Kingdom, and may also legislate for the Crown Dependencies and the British Overseas Territories. It meets at the Palace of Westminster in London. Parliament possesses legislative supremacy and thereby holds ultimate power over all other political bodies in the United Kingdom and the Overseas Territories. While Parliament is bicameral, it has three parts: the sovereign, the House of Lords, and the House of Commons. The three parts acting together to legislate may be described as the King-in-Parliament. The Crown normally acts on the advice of the prime minister, and the powers of the House of Lords are limited to only delaying legislation. The House of Commons is the elected lower chamber of Parliament, with elections to 650 single-member constituencies held at least every five years under the first-past-the-post system. By constitutional convention, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Channel
The English Channel, also known as the Channel, is an arm of the Atlantic Ocean that separates Southern England from northern France. It links to the southern part of the North Sea by the Strait of Dover at its northeastern end. It is the busiest Sea lane, shipping area in the world. It is about long and varies in width from at its widest to at its narrowest in the Strait of Dover."English Channel". ''The Columbia Encyclopedia'', 2004. It is the smallest of the shallow seas around the continental shelf of Europe, covering an area of some . The Channel aided the United Kingdom in becoming a naval superpower, serving as a natural defence against invasions, such as in the Napoleonic Wars and in the World War II, Second World War. The northern, English coast of the Channel is more populous than the southern, French coast. The major languages spoken in this region are English language, English and French language, French. Names Roman historiography, Roman sources as (or , ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frederick Beaumont
Frederick Edward Blackett Beaumont (22 October 1833 – 20 August 1899) was a British Army officer and politician. A member of the Royal Engineers, he produced several inventions, including a tunnel boring machine which bore his name, and the Beaumont–Adams revolver. Early life Beaumont was the son of Edward Blackett Beaumont and Jane Lee. He was born in Darfield, South Yorkshire and educated at the Harrow School, Harrow on the Hill, England. Career Beaumont served in the Royal Engineers and was a contemporary of General Charles George Gordon; his name appeared directly before Gordon's in the Army Lists from the date of their first commissioning on 23 June 1852. As a lieutenant, Beaumont saw service during the Crimean War, and was one of only a small number of British officers who served with Turkish forces along the Danube, serving with the (local) rank of Captain in the Turkish Contingent Engineers, for which service he was awarded the Turkish Crimean War medal rather t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Disc Harrow
A disk harrow is a harrow (tool), harrow whose cutting edges are a row of concave metal discs, which may be scalloped or set at an oblique angle. It is an list of agricultural machinery, agricultural implement that is used to tillage, till the soil where crops are to be planted. It is used to chop up unwanted weeds or crop residue. It is also one of the many soil cultivation implements alongside tilers and moldboard plows. It consists of many carbon steel discs, and sometimes longer-lasting boron steel discs, which have many varying wikt:concave, concavities and disc blade sizes and spacing (the choices of the latter being determined by the final result required in a given soil type) and which are arranged into two sections ("offset disk harrow") or four sections ("tandem disk harrow"). When viewed from above, the four sections would appear to form an "X" which has been flattened to be wider than it is tall. The discs are also wikt:offset, offset so that they are not parallel w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hoosac Tunnel
The Hoosac Tunnel (also called Hoosic or Hoosick Tunnel) is a active Rail transport, railroad tunnel in western Massachusetts that passes through the Hoosac Range, an extension of Vermont's Green Mountains. It runs in a straight line from its east portal, along the Deerfield River in the town of Florida, Massachusetts, Florida, to its west portal, in the city of North Adams, Massachusetts, North Adams. Work began in 1851 under an estimated cost of $2 million and ended in 1875, having used $21 million. At its completion, the tunnel was the world's second-longest, after the Fréjus Rail Tunnel, Mont Cenis Tunnel through the French Alps. It was the longest tunnel in North America until the 1916 completion of the Connaught Tunnel under Rogers Pass (British Columbia), Rogers Pass in British Columbia. It remains the longest active transportation tunnel east of the Rocky Mountains, and is the sixth-longest railroad tunnel in North America. The American Society of Civil Engineers ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
