Ballast - permanent way, Mechanical Engineering

Assignment Help:

Ballast:

Ballast is the layer of broken stone provided on the formation on which the sleepers rest. The stones are cubical in shape and pass through 50 mm square mesh. The functions of the ballast are:

(a) To distribute the load of traffic to the earthen formation to a safe value.

(b) To act as an elastic bed to absorb the impact of the wheels.

(c) To hold the sleepers firmly in the lateral and longitudinal directions.

(d) To act as a good drainage medium.

(e) To provide a convenient medium to pack the track to the desired levels.

(f) To prevent capillary rise of water which may cause decay/corrosion of sleepers?

(g) To check the growth of vegetation under the track.

The thickness of ballast for a high density BG track is 300 mm, and it is 250 mm for a low density BG track. Figure 4 gives the standard ballast section.

2246_Ballast - permanent way.png

Figure: Standard BG Track Ballast Section


Related Discussions:- Ballast - permanent way

Composites , For an automotive component of your choice that is traditional...

For an automotive component of your choice that is traditionally metallic, review how it could be re-engineered as a composite? How factors such as fibre & matrix type, fibre volum

Rockwell hardness test, Rockwel l Hardness Test: The specimen is subj...

Rockwel l Hardness Test: The specimen is subjected to a major load for about 15 seconds after the initial load. ASTM says 13 scales for testing of wide range of materials. Th

Laminar flow, Consider fully developed laminar flow with constant propertie...

Consider fully developed laminar flow with constant properties in a circular tube. Let there be heat transfered  to or from  the fluid at a constant rate per unit of tube length.Ad

Creating a new style-autocad, Creating a new style To create a new dime...

Creating a new style To create a new dimension style, make sure the STANDARD style is the current style, click in the Name edit box then type the name of the new style you want

Explain basic types of sand testing, Q. Explain basic types of Sand testing...

Q. Explain basic types of Sand testing? Moulding sands should be of proper quality to meet the required level of accuracy and surface finish of castings. Proper quality of the

Determine magnitude and direction of the resultant force, Determine magnitu...

Determine magnitude and direction of the resultant force: A system of forces is acting at the corner of a rectangular block as shown in the figure. Determine magnitude and di

#title.scale, actual division 2km is shown as 1 cm in a map.construct a cle...

actual division 2km is shown as 1 cm in a map.construct a clean scale to measure km which can travel a distance upto 30 km.Show measurement of 18 km in the scale

What is the brick inner surface temperature, Derive 3-D non-steady state co...

Derive 3-D non-steady state conduction equation in spherical co-ordinates. Explain the assumption involved. The hot combustion gases of a furnance are divided from the ambient a

Illustrates about the term rectangular footings, Illustrates about the term...

Illustrates about the term rectangular footings? RECTANGULAR FOOTINGS: The design of rectangular footings is similar to that of the square footings. The major difference is

Kinetics of a particle, Kinetics of a Particle: We have seen the effec...

Kinetics of a Particle: We have seen the effect of forces on a particle. The laws of motion for a particle are extended to include a system of particles or a rigid body. It is

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd