【英文文献及翻译】中国高速铁路ChinaHigh-SpeedRailway

China High-Speed Railway

As the economic grow, intercity travel demand has increased dramatically in the Greater

China Area. Traditional railways can hardly satisfy the passenger and freight travel demand,

high speed rail is hence proposed and constructed after 1990s. This study aims to integrate

current development of both rail-based and Maglev high speed trains in this area. From 1997,

Taiwan kicked-off its high speed rail construction by importing the technology of Japanese

Shinkansen. The Taiwan High Speed Rail is a 15-billion US dollars project. To save the cost

of construction and management, the BOT model was applied. Though not totally satisfied,

this project is still successful and ready to operate in the 4th quarter of 2007. China is

preparing its high speed rail services by upgrading current networks. The capacity and

operating speed are all increased after 5-times system upgrade. The 6th upgrade will be

initiated in 2006. By then, trains will run at a speed of 200km/h in a total distance of 1,400km

in 7 different routes. From the white paper published by the Ministry of Railway in China,

there will be totally 8 rail-based High Speed Train services. Four of them are North-South

bound, and four of them are East-West bound. 5 of the 8 High Speed Rails are now under

construction, the first line will be finished in 2009, and the 2nd one will be in 2010. By 2020,

there will be totally 12,000 kilometers high speed rail services in China. The 250 billion US

dollars construction cost still leaves some uncertainties for all these projects. Finally, the

future of the Maglev system in China is not so bright as rail-based. Shanghai airport line

could be the first, also the last Maglev project in China if the approved Shanghai-Hangzhou

line cannot raise enough 4.4 billion dollars to build it.

Steel rail composition

Steel rail is composed of iron, carbon, manganese, and silicon, and contains impurities

such as phosphorous, sulphur, gases, and slag. The proportions of these substances may be

altered to achieve different properties, such as increased resistance to wear on curves.

The standard configuration for North American rail resembles an upside down T. The

three parts of T-rail are called the base, web, and head. The flat base enabled such rail to be

spiked directly to wooden crossties; later, rail was placed on the now-standard steel tie plate.

While the proportions and precise shape of rail are subject to constant analysis and refinement,

the basic T-section has been standard since the mid-19th century.

Weight

The most common way of describing rail is in terms of its weight per linear yard

1 / 5

historic British unit of length>, which is a function of its cross section. In the late 19th century,

rail was produced in a range of sections weighing between 40 and 80 lbs. per yard. Weights

increased over time, so that rail rolled today weighs between 112 and 145 lbs.

Pennsylvania Railroad's 155-lb. section, used for a time after World War II, was the heaviest

used in the U.S.>

Jointed rail segments

The length of standard rails has historically been related to the length of the cars used to

transport them. From an early range of 15-20 feet, rail length increased with car size until a

standard of 39 feet was reached.

Even with the advent of today's longer cars, 39 feet has remained the standard for rail owing

to limitations in steel mills and ease of handling.

The joints in rail — its weakest points — can make for a rough ride, and are expensive to

maintain. Individual rails are joined with steel pieces called joint bars, which are

held in place by four or six bolts. Today, the six-bolt type, once reserved for heavy-duty

applications, is standard. The bolts in a joint bar are faced alternately outward and inward to

guard against the remote possibility that a derailed car's wheel would shear them all off,

causing the rails to part. Transition between rails of two different weights is achieved with

special angle bars. In territory where the rails serve as conductors for signal systems, bond

wires must be used at the joints to maintain the circuit.

Welded rail

The troublesome nature of rail joints prompted the most easily recognized advance in rail

technology: the adoption of continuous welded rail .

From its early use on a handful of roads in the 1940's, welded rail has come to be preferred for

almost all applications. It is produced by welding standard 39-foot

segments together into quarter-mile lengths at dedicated plants.

The rails are transported to where they're needed in special trains, which are pulled

slowly out from under the rail when it is to be unloaded. When in place, CWR is often

field-welded into even greater lengths. Much jointed track survives because of the long

lifespan of even moderately used rail, and because the specialized equipment needed for

CWR installation is not economical for short distances.

Managing the expansion and contraction that comes with temperature change is

important with CWR. To avoid expanding and potential buckling when in service, welded rail

2 / 5

is laid when temperatures are high . Rail anchors clipped on at the

ties keep the rail from getting shorter as it contracts with falling temperatures. Thus

constrained, it shrinks in cross section , but not in length. Because it's in

tension, welded rail is treated with care during trackwork in cold weather.

Maintaining and reusing rail

Under heavy traffic, rails get worn down, although their life can be extended by grinding

the head back to the proper contour.

Rail no longer suited for main-line use may still have some light-duty life in it and is often

relaid on branches, spurs, or in yards. Main-track reduction projects are also sources of such

"relay" rail.

When rail wear is uneven at a given location , rail may be transposed

from one side to another to get maximum use out of it.

中国高速铁路

随着经济的增长,城市间的旅行需要在中国地区飞速增长.传统铁路已经很难满足旅客的货运的需求,因此自1990年起高速铁路被提上议程并着重建设.这个研究的目得是在于这个区域内的基本线路和高速磁悬浮列车得到发展

自1997年起,##通过引进日本新干线技术开始进行它的高速铁路建设,##的高速铁路是一项耗资150亿美元的工程,为了节省建设和管理的开支,他们采用了BOT的经营模式,尽管并不是完全的满意,但是这项工程还是很成功的,并且预计在2006年底实行运转,中国正在通过提升现在的网络系统为自己的高速铁路服务而做准备,在第五次系统提升之后,铁路的接纳能力和运转速度都得到了增长.第六次大提速将于2007年进行,到那时火车将在7条不同的铁路线路上,全程1400公里,以每小时200公里的速度运行.中国铁道部发布的官方报告上声称将共有八条基本铁路为你服务.其中有四条是南北纵向的,另外四条是东西横向,八条高速铁路中五条现在正在建设中,第一条将于2009年竣工,第二条将于2010年.到2020年,中国高速铁路线将长12000公里,不过2500亿美元的建设经费将会使所有这些项目都成为不确定工程,最终,将来的磁悬浮的系统在中国带来的前景不差于一般的基本线路.##的航线将成为第一项也是中国磁悬浮工程的最后一项,如果在中国批准建设##到广州的航线不超过44亿美元.

也许再没有哪一部分像轨道一样重要.轨道与车辆轮缘一起作用,使铁路运输体系与普通道路完全不同.

虽然,现在钢轨是很普及的,但是在19世纪时,铁轨甚至木枕都是广泛使用的.很多早期的铁路是用薄铁条或铁皮条约束在木轨上给车轮提供一个光滑的跑道面.

3 / 5

钢轨的组成

钢轨是由铁、碳锰、硅,包括杂质如磷、硫、气体和炉渣组成的.这些物质含量的变化,可起到不同的作用,如增加曲线轨道的耐磨性.北美国钢轨的标志结构类似一倒T 型.T型轨的三要素是轨底、腹板和轨头.平底的钢轨能被直接地固定到木枕上；然后钢轨被放置到已设好的钢垫板上.19世纪中期以来,当钢轨的大小和标准的成型后接受长期的分析和精致时,基本的T型截面以成标准.

重量

最常见的描述钢轨的方法是用每码长的重量表示,它是钢轨横断面大小的函数.19世纪后期,钢轨被做成重量从40IBS每码到80IBS每码变化的一系列截面,重量的增加超过时间的变化,因此,目前钢轨以扎制成155-IB的截面,在第二次世界大战后的某个时间开始使用,是在美国用过的最重的钢轨.一般地,给定线路的运输吨位越大或速度越快,采用的钢轨就越重.由于轨道维修费用较高,越重的轨道寿命越长,从而越受欢迎,即使在载重轻运输慢的城市交通系统.重型钢轨常被用于道路交叉处,铁路转辄器及与其他线路的平交道口处.

钢轨的连接

在历史上,标准轨的长度是与运送它们的车辆长度有关系的.早期是从15英尺到20英尺变化的,钢轨的长度随车辆大小的增加直到39英尺的规格〔可被过去常用的40英尺长的车辆容易的容纳〕尽管现在有更长的车辆,但由于钢轨扎制机的限制和搬运的方便,钢轨的标准长度仍保持未39英尺.接头是钢轨的最薄弱点,会使行车不平稳,且维修费用高.个体的钢轨用叫做夹板的钢板连接,用4-6个螺栓夹在原位.现在,以过去只用于重型轨的六螺栓式接头为标准形式.接头螺栓是交替向内和向外布置的,以防止车辆车轮对钢轨的长期磨损后可能产生出轨,从而使钢轨接头分离.两种不同型号的钢轨的连接是用特殊接头来实现的.用于信号服务的轨道,必须在接头处设有电线来形成闭和的电路.

钢轨的焊接

令人头痛的钢轨的连接问题激起显而易见的轨道模式的发展：无缝线路的采用.从20世纪40年代,最早在少数线路使用以来,在所有的应用X围内,无缝线路受到了欢迎.它是在工厂将39英尺〔或新的78英尺〕长的标准轨焊接成四分之一英里的长钢轨.

钢轨用特定的火车运送到需要地,当要卸下时,火车慢慢地从钢轨下开走.当就位以后,无缝线路通常是就地焊接成更长的轨道.许多接头轨道仍然保留是因为使用适度长的钢轨其寿命长,由于铺设无缝线路对设备特殊要求,使其短距离铺设是不经济的.

对无缝线路由于湿度变化引起的膨胀和收缩的处理是很重要的.为了避免在使用4 / 5

中的钢轨的膨胀和自身的变形.无缝轨应在高温时〔或人为加热后〕铺设,钢轨用锚栓夹在轨枕上防止钢轨在温度降低时收缩而变短.这样约束后,钢轨仅在横向收缩.由于受拉,无缝轨在寒冷天气使用时应小心对接.

钢轨的养护和再使用

在重交通作用下,钢轨会变坏,尽管它们的寿命可以通过磨其头部回到合适的轮廓而持续.

钢轨不仅使用于主线,仍有一些轻型的部位,常被用在道岔,尖端或车站.主要轨道的缩短工程是这些重新铺设的轨道的来源.

当钢轨磨损不再在先前的位置〔如一条曲线〕,钢轨将被从一边换到另一侧来实现最大限度的使用.

5 / 5