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Saturday, April 25, 2009 - Most need independent
| Subway encyclopedia content from the definition of urban rail transit system,cell phone such as the following five conditions: Must be the public transportation system Must be located within the city Must be with electric drive Most need independent of mobile phone other traffic system (such as roads and other railway) Shift must often Most of the urban rail transit system in urban centers in the underground mining section will spread in the tunnel.wholesale cell phone These systems can be called underground railway, referred to as subway or subway. In Taiwan, is called "the MRT" Mass Transit system (will), the MRT. In mainland China, built in the city of urban rail transit elevated light rail system is usually called ". However, in the professional field,Wholesale mobile phone "light" and "metro" distinction lies in different ways, "volume light" refers to a one-way traffic is less than 20,000 per hour of urban rail transit system, and the "means more than 20,000 per hour cell phone accessories one-way traffic of urban rail transit system. Trams due to traffic tools used jointly with other road surface, therefore are not usually included in urban rail transit system range.wholesale cellphone accessories But with the development of modern public transportation technology, there are more and more urban light rail using trams and mixed mode, in the place of loose alone in the plane strain of rail, where public road pavement,cheap cell phone according to the specific circumstances of the station, both flexibility and vague boundary. 1 purposes Most of the urban rail transit system is used to transport of passengers, the diligent in many cases of urban rail transit system is the backbone of the urban traffic. Chicago has used to transport goods of the underground railway,cheap mobile phone London is also have special carrier mail underground railway. But two railway has successively in 1959 and 2003 discontinued. In the war (such as the second world war,Digital Picture Frame underground railway also will be used to factories or shelter. Many countries (such as South Korea, in the subway system) is the design calculation in design of war may,Digital Picture Frame within the depth of the railway,cheap digital camera so whether the crowd control, are both traffic and defense of daily needs. In addition,wholesale digital camera urban rail transit system was also used to display the national in the economic, social and technically superior index.digital camcorder As the underground railway system in the former Soviet union and decorated with the north Korean capital, Pyongyang, for the underground railway system also has the magnificent decoration. 2 underground railway construction In the tunnel and underground is not an easy thing, but also needs a large amount of money and time,camera accessories at least for years to complete. Ming dig backfilling The most direct and simple method is dig with (Ming dig backfilling). This method is usually in the streets and in the hole digging tunnel structure built again,tv mobile phone tunnel have enough supporting force only after the paved roads. Besides road was dug, other underground structures such as water, telephone wires, etc. All need to be configured. Building materials are generally this tunnel concrete or steel, but older system are also used bricks and iron. WaFa drill Another method is to start somewhere in the ground dig a shaft, then in the bottom of the mining tunnel.cell phone watch The most common method used for drilling machine, WaJi (shield tunnelling machine), a mining as prepared components installed in the tunnel wall.quad band cellphone For building highly intensive places (such as Hong Kong), WaFa drill or even the only feasible construction method. The advantages tri band cellphones of this method is on the streets or other underground facilities, even a little effect on the building (London, Seoul and Hong Kong's metro systems have many across rivers or seaports tunnel),double sims phone Tunnel design also has more creative space, such as the station will stand and stand between than the tunnel, help train leaves at the stop and slow speed. But this WaFa nor no faults,camera tripod one is often need to notice the effects of groundwater, In some hard rock excavation, may need explosives. Underground air supply problems even tunnel collapse also may cause workers casualties.canon camera battery In addition, for building high dense, except to pay attention when mining site around to avoid the architectural structure, sometimes also affect the whole to the underground utilities, the water, the transmission line, in order to make room for migration channels to construct the train. 3 in history Paris metro rubber wheel the world the first underground Railway system is in 1863, the opening of the London's Metropolitan Railway Metropolitan Railway. When power is still uncommon, so even if only in the underground railroad steam. Due to the release of the motorcycle exhaust harmful to human body, so the tunnel at every distance will have and the ground through the ventilation. By 1870, London opened the first passenger drilled in the London underground, the type of tower over the Thames nearby. But this is not successful, railway in months after it was closed. The oldest type of underground railway drilled in 1890 opening, also is London, connecting with the southern city. The first railway builder plans to use the method of similar cable car, but the final push with electric locomotive, make the first electric subway. Early in the city of London underground in 1905 fully electrified. Paris, France in 1900 Paris metro, the French name first Chemin DE Fer from Railway Metropolitain Metropolitan directly translated into the past, then shorten metro, so many urban rail system metro said. Russia also logical, but the subway to the Cyrillic alphabet,sony camera battery called งฎ งึ งไ งโ งเ. Asia's earliest underground railway in Tokyo, Japan in 1927. In addition, Istanbul, Turkey's first subway construction in 1910 (tunnel excavation in 1875, used in 1910), but because the carriage city located in Europe, so not considered 1 subway in Asia. Africa's earliest underground railway in Cairo, Egypt, 1987. China's first underground railway in 1969, the opening of the Beijing subway. Hong Kong's metro began in 1979. Singapore's first subway in 1987. Taiwan's first MRT is in 1996, the Taipei MRT mucha opening line. The Korean peninsula in Pyongyang 1 subway construction in 1968, 1973, 6 September 1 subway Line (winged Chollima competition). 4 the deepest underground railway Some of the urban soil instability, or to strategic need to dig tunnels, particularly deep. canon camera battery The underground railway saint Petersburg commonly more than 100 meters deep. However, the world's deepest underground railway station and no conclusion: St. Petersburg itself three underground railway station has the deepest may be the world. Moscow and Kiev each has a very deep. Two stations were built in the mountain. The north Korean capital, Pyongyang also have an underground railway station can compete for this position, it is the deepest of 200 meters underground, the average depth is at least 100 meters. 5 power supply Generally speaking, the urban rail system of the third rail, the fourth power can track or aerial cable etc. The third rail rail routes in the original two new rail charged, vehicle side of electric power; get boots set Electricity flows through wheel and orbit to plant. The fourth rail, besides original principle: support with wheels, another track seeker two additional orbit each negative poles, or supply of dc supply three-phase ac,camera accessories but as the third rail systems.common rail, economic. Overhead cables, cable offer by aerial electric vehicle is obtained by electric power, sometimes also bow to wheel track will be back by current power. 6 vehicles Initial urban rail system, then the carriage is ligneous into steel in order to reduce the risk of fire. Since the opening of the Toronto in 1953, the underground railway carriage began again for aluminum, effectively improved to reduce the maintenance cost and weight. Many of the tunnel and underground railway walk than in the main stem of online for small, So generally underground railway train volume generally are smaller.digital camcorder Sometimes even can influence the train tunnel shape design, for example, the London underground is part of the train. Most of the urban rail systems are used, and do not use/locomotives carriage. If use locomotive, often with push-pull operation. In addition, part of the system has advanced automatic train began operating system. London,wholesale digital camera Paris, Singapore and Hong Kong are not control train conductor. Advanced systems and even do no control, such as Hong Kong metro line of Disney. 7. Track and wheels General urban rail system used to track and metal wheels. But in recent years there are systems use cheap digital camera concrete track or rubber wheel (or similar), or motorcycle both. 8. The subway 1 top speed of train running fast speed of 80 kilometers, the average traffic for 36 kilometers, every 30 seconds, the subway stop by xinzhuang station of Shanghai railway station to travel time for 39 minutes. 2 accurate city ground transportation by road traffic conditions or the weather effects, but did not interference.cheap cell phone In the busy traffic peak time, the subway train every 5 minutes by bus, train operation opened up to 4:55 morning evening they stop. 3 security by train operation safety automatic control system to ensure that train headway. The power supply, electricity supply by double little possibility. Subway fire prevention measures, the same attention with sufficient fire-fighting facilities, each station are installed closed-circuit monitoring system, have to the station. In addition, each station by the Shanghai public security bureau for urban rail security officers. 4 comfortable with the train is air conditioning, temperature and humidity in the comfort range. Press 6 train compositions,wholesale cell phone each car seat, including 310 people officials said the train can 62, passengers 1860. May the bright and beautiful environment, convenient and clean equipment modernization. Because of using automatic fare collection system, adapt lots of passengers using the subway. The station platform floor supervisor and with attendant to help passengers to solve the problem. Subway has clear guidance everywhere, make passengers take metro is very convenient and simple. 9 subway safety knowledge commonly In the subway, within the scope of passengers should be: 1 the attention and train guide sign 2 the announcement and broadcasting, attention and follow the instructions 3 and correct use of exit, the front gate on the closed gate and passengers through rear can use 4 in safety first, after waiting outside the next hop on and don't crowded 5 to the passenger seat is needed 6 advertent train radio, get ready 7. Careful of children and the elderly care According to clew, and correct use of safety and emergency facilities 9 if an emergency occurs, immediately notify the staff 1 smoking 2 run and play, over the gate and railings 3 into the subway tunnel, elevated lines of public area The following items: carry 4. . Excessive objects or goods, . Pets and other livestock. . Danger: The first class: explosion or explosive detonator, grenades, such as, explosives, fireworks, firecrackers, fuse, etc, The second: compressed gases and liquefied gas, such as liquefied petroleum gas, natural gas bottle of bottle of compressed gas cylinders and other; etc. Third class: flammable liquids, such as gasoline, kerosene, diesel oil, paint, alcohol, XiangJiaoShui; etc. Iv: flammable solid, spontaneous combustible goods and wet items such as yellow phosphorus, sulfur and wp, peroxide sodium, calcium carbide TanHuaGai (), sodium, potassium, etc. V: strong oxidizer, such as strong sulfuric acid, nitric acid, hydrochloric acid, s., etc.; strong Sixth: mischief and infectious items, such as chlorination mercury, QingHuaJia, ****nic trioxide (****nic), nicotine, asbestos, all kinds of pesticides, etc. Seventh: radioactive substances, such as laser polonium, uranium, etc.;, 8 categories: corrosive, such as acid, phosphoric acid, ammonia, etc. Ninth: other may affect the safety of the passengers. |
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