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

Theory of constraints, Theory of Constraints: Goldratt's theory of con...

Theory of Constraints: Goldratt's theory of constraint has attracted the attention of several practioners in the industry. His concept of goal, constraint, and throughput, cri

Define term transfer of stress to footing, Define term transfer of stress t...

Define term transfer of stress to footing. Transfer of Stress to Footing:  The column transfers the load to the top of the footing by bearing. The magnitude of the pressure

Explain cutting speed - cutting parameters, Explain Cutting Speed - Cutting...

Explain Cutting Speed - Cutting Parameters It is relative speed (V 1 ) between wheel and the Work piece. It is expressed in m/sec.   V=Cutting speed=V 1   =

Calculate the natural frequency, (a) Calculate the natural frequency of mas...

(a) Calculate the natural frequency of mass m = 1 Kg placed at one end of a cantilever beam of negligible mass. Length of cantilever = 500 mm, d = 30 mm, b = 20 mm, E = 210x10 9 N

Design a pipeline and pump station to pump water, Design Problem:  Design a...

Design Problem:  Design a pipeline and pump station to pump 100 MGD of water to the Mississippi river.  To reduce the required horsepower of the pumps, the flow will be pressurized

Determine the stresses acting on the plan, Using Mohr's Circle Method deter...

Using Mohr's Circle Method determine the stresses acting on the plan as shown in figure. Also write the procedure.

Determine lift coefficient, A thin spanwise symmetrical wing has an aspect ...

A thin spanwise symmetrical wing has an aspect ratio of 10 and a straight edges with  taper ratio (tip chord / root chord) of 0.8 and root chord of 1 m. This wing does not have geo

Determine the acceleration of the body, Determine the acceleration of the b...

Determine the acceleration of the body: Two weights P and Q are associated by the arrangement shown in Figure. Neglecting friction and the inertia of the pulleys and cord, det

Calculate plastic zone - fatigue crack propagation mechanism, Calculate pla...

Calculate plastic zone: Calculate plastic zone ahead of crack in above problem if σY = 250 MPa. Solution From Eq. Here KI is taken as KI max since the plastic

Steam, what is dry ness fraction?

what is dry ness fraction?

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