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FASTENING

FASTENING

The devices used to connect rails and sleepers together to form the track are known as FASTENINGs.  Following devices are used as fastenings to keep the rails in their correct position

  • Fish plates
  • Bolts.
  • Chairs
  • Keys.
  • Bearing plates.

1.  FISH PLATES
The function of a fish plate is to hold two rails together both in horizontal as well as in vertical planes. At each, joint a pair of fish plates is used.

Fish Plate

Fish Plate

2. BOLTS
Various types of bolts are used in railroad fitting. Some common types are enumerated below.

 Fish bolts:
With each pair of fish plates two, four or six fish bolts are used. The standard practice is to use  four  bolts. They  are made up  of  high carbon steel to with stand considerable stresses.

Fish Bolts

Fish Bolts

Dog Spikes:
Dog Spikes are used for holding the rail to the wooden sleepers. The spike has smooth sites and depends for its holding power on the friction of wood fiber.

Dog Spikes

Dog Spikes

 Screw Spikes:
Screws pikes are used for the same purpose as dog spikes but have a much greater holding power than dog spikes approximately double that of dogs pikes.

Screw Spikes

Screw Spikes

Round Spikes:
Round spikes are used for fixing chairs to the wooden sleepers. Their use is limited.

Round Spike

Round Spike

 

Fang Bolts:
They have the same purpose as round spikes. The fang bolts have greater strength  as compared to round spikes as they have threads and also grip the sleeper from the Bottom.

Fang Bolts

Fang Bolts

3. CHAIRS
Chairs are used to hold the double headed and bull headed rails in position. Invariably chairs are made of cast iron and they help in distributing the load from rails to sleepers

Charis

Charis

4. KEYS
They are wedge shaped wooden pieces or metal pieces. They keep the rail in proper position. Wooden keys are cheaper, but liable to be attacked by vermins. Hence a number of metal keys have been devised.

5. BEARING PLATES
Chair used for flat footed rails are known as bearing plates. They increase the bearing area on the sleeper and thus decrease the loading-intensity.

Bearing Plate

Bearing Plate

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About Mustafa

My name is Mustafa Awais, I am basically from Pakistan & Currently living in Saudia Arabia, I am Civil Engineer as well as Web Master.

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