TYPES OF RAILS

1. Double headed rails ( D.H. rails)

  • These rails wear used in the beginning 
  • The idea was , when the head will wern out in course of time, the rail can be inverted and reused 
  • In the lower part the inundations wear so formed that smooth running over that surface at the top was impossible , so idea got failed 


2 . Bull headed rails ( B.H. rails ) : 
  • In B. H. Rails the head was made a little thicker and stronger then the lower part 




3 . Flat footed rails ( F.F. rails ) : 
  • F.F. rails are also called vignole's rails after the name of the inventor 
  • Bearing plates are used between the sleeper and rail at rail joints 
  • These rails are designated by wt of rail per unit length 
  • 52 kg/ m or 52 MR and 60  kg / m or 60 MR F.F. rails are used in India 
  • 52 kg rail is suitable upto speed of 130 kmph and 60 kg rail is suitable upto speed of 160 km/h 

Comments

Post a Comment

Popular posts from this blog

WHAT IS SLUMP TEST

Image
Slump test is one of most extensively used test all over the world  Slump test does not measure workability of concrete , although it gives a measure of consistency , but is very useful in detecting variation in uniformity of mix of given nominal proportions  Dimensions of the mould are, bottom diameter =200 mm top diameter =100mm and hight = 300 mm  Mould is filled in with fresh concrete in four layers , each layers of approximately one - quarter of the height of the mould and tamped with 25 strokes of the rounded end of the tamping rod ( dia 16 mm and length 600 mm)  Strokes are distributed in a uniform manner over the cross section and for the second and subsequent layers should penetrate into the underlying layer  After the top layer has been rodded, the concrete is struck off level with a trowel or the tamping rod such that the mould is exactly filled .  Mould is removed immediately by raising il slowly and carefully in a vertical direction   It allows the concrete to sub
Read more

WARKABILITY

Warkability is defined as the property of concrete which determines the amount of useful internal wark necessary to produce full compaction  In simple words it can also be defined as the ease with which concrete can be compt 100% with regard to made of compaction and place of deposition  A concrete which can be readily compacted is said to be workable , but to merely say that warkability determines the ease of placement and the resistance to segregation is to loose a description of this vital property of concrete  Desired warkability in any particular case would depend on the means of compaction available likewise ,a warkability suitable for mass concrete is not necessary sufficient frothing , inaccessible ,or heavily reinforced section  It should be noted at warkability is different form consistency . consistency indicates fluidity or mobility  Concrete with high consistency may not be workable for a particular job and concrete having same consistency many very in warkability
Read more