CHAPTER II : THE CHARACTERS OF METRO LINE

Fundamental of the metro componentsTerminology of the rail infrastructure.Terminology of the metro and its definitions.Operations and kinds of aglinement line styles Keywords and vocabulary summarise.

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CHAPTER II : THE CHARACTERS

OF METRO LINE

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Outline

1 Terminology of the rail infrastructure.

2 Terminology of the metro and its definitions.

3 Operations and kinds of aglinement line styles

4 Keywords and vocabulary summarise

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Nội dung môn học

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Chap II: The characters of Metro line

II.1 Terminologies of rail infrastructure.

Geometry of a railway line:

Above and next to the tracks a certain space should be reserved to ensure the unrestricted passage of vehicles The dimensions of this structure gauge (or clearance) is also based on the internationally approved vehicle gauge of

railway rolling stock and the loading gauge, within which the loading of the railway vehicles should be kept

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The clearance extra effects are dealt with:

• Deviation of the correct track geometry

• Swinging movement

• Deviation due to wind load

• Tilting due to cant

• Unequal loading of vehicles

• Tolerance of vehicle dimensions

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This figure shows the nomal clearance in

which the left side applies to the straight

track, the right side to curves with a radius

greater than 250m Height measured from

top of the rail

Figure 2.1 Metro rail track gauge

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Clearance around rail track:

The railway law stipulates that no object may be erected that cause an

obstruction of the view:

• Within a distance of 8m in straight track and on the outside of a curve with a radius of more than 1000m

• Within a distance of 20m on the inside of a curve with a radius of less than 1000m

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Tracks structure

• Rail – rail pad – baseplate

• Baseplate – Sleeper

• Sleeper – Ballast bed

• Ballast bed – Substructure

• Substructure – Natural soil

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Track requirements:

The term railway track or “permanent way” entails tracks, switches,

crossings, and ballast beds The track is used by locomotives, coaches, and

wagons which in Europe normally have maximum axle loads of 22,5T and

which run at speeds up to 140 km/h The fact that the purpose of the track is

to transport passengers and freight and that operation is required to be as economical as possible and safety, gives rise to a number of the requirements

to be met by the track

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These are formulated as follows:

• Bearing in mind permissible speed and axle loads, the rails and switches must be safe for vehicles to run on To ensure this the track components, such as the rails, must be of such dimensions that they do not fall under the traffic load Moreover, the correct geometry must be maintained

whether the track is under load or not

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• Tracks and switches must allow comfortable passage at all times Even if safety

is not jeopardized, the locomotives and coachs may experience such vibrations and oscillations during the journey that passage becomes unpleasant for the

passengers An unfortunate combination of switches, curves and reserve curves may, even if the track is very well constructed and has perfect geometry cause such strong movements in a vehicle that the passengers experience most

unpleasant and sometime even frightening sensations.

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• Tracks must be electrically insulated so that the track circuits required for signaling continue to function even under the least favourable weather conditions and to ensure that on electricfied sections the return current does not return to earth as stray current

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Key words summary.

No Keywords Meanings

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II.2 Terminology of the metro and its definitions

Metro line components:

• Stations: is a railway station for a rapid transit system Such a station can be elevated, underground, or about ground level depending on the level of the train tracks At crossings of metro lines, they are multi-level There are entrances/exits at ground/street level, often with stairs or

sometimes ramps or escalators leading to any elevated or lowered track level area

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• Stations

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• Tunnels is an underground or underwater passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods

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• Tunnels

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• Tracks on a railway or railroad, also known as the permanent way, is the

structure consisting of the rails, fasteners, railroad ties (sleepers)

and ballast (or slab track), plus the underlying subgrade It enables trains to move by providing a dependable surface for their wheels to roll For clarity it

is often referred to as railway track or railroad track Tracks where electric trains or electric trams run are equipped with an electrification system such

as an overhead electrical power line or an additional electrified rail

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• Tracks on railway

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Key words summary.

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1 What is/are the purpose(s) of the clrearance around the metro train ?

2 What is the host in which the dimensions of this structure gauge based on?

3 Which factors affect the clearance reserve ?

4 What is the differences between the left and right side of Fig.2.1 ?

5 What is the most important stipulate for buiding around the railway ?

6 What are the components of the permanent way ?

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7 Can you distinguish among the locomotive, coach and wagon ?

8 What are the most important requirements of the raiway transit ?

9 Why passenger also feel unpleasant when traveling by train ?

10 Is the station must have over the ground ?

11 What is the boring method ?

12 Can you list the components of the track structure ?

Tiêu đề	The Characters of Metro Line
Trường học	University of Hanoi
Chuyên ngành	Transport Engineering
Thể loại	lecture notes
Năm xuất bản	2023
Thành phố	Hanoi

Định dạng
Số trang	23
Dung lượng	4,85 MB