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RAIL CUTTING MACHINE PREFABRICATED MOULDS GLUED INSULATED JOINTS FLASH BUTT WELDING
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GLUED INSULATED JOINTS

The economies and advantages offered by long welded rails are well known. There is a considerable saving in fuel consumption and in maintenance cost of tracks and rolling stock with an increase in life of the track. In addition to that, elimination of noise and vibration ensure a smooth and comfortable travel. A benefit of this is an increase in speed leading to a better and more efficient utilization of track and rolling stock.

However, the continuity of the track has got to be broken on either side of the railway stations for the transmission of the electrical signals, which are used to avoid accidents like collisions and derailments.

These disadvantages of the conventionally insulated joints were overcome by the introduction of Insulated Glued Rail Joints. In this joint, rails, fish plates, bolts and nuts are permanently bonded together with an insulating epoxy adhesive. Such Insulated Glued Rail Joints have a life of several years if properly maintained and are more economical in the long run, although initially costlier.



NEW DEVELOPMENTS

Factory made type

In this type of Insulated Glued Rail Joint, popularly called S-type, the rails are sent to the factory and the joints are fabricated in lengths of 4 to 6.5 meters each. These are then transported to the site and inserted into the track by welding on both ends. Salient features of this joint are:

Insulating resistance in dry condition - over 70 mega ohms.
No flash over 4000 volts.
Pull out strength of the 60 kg Glued Joints with 4 bolts is about 200 tons.


Click to enlarge



In-Situ Type: Two types of In-Situ Insulated Joints are available

A. These joints can be fabricated on site of the existing fish plated joint. This is so provided the fishing areas, bolt holes and rail ends are undamaged. The salient features of in-situ type Insulated Glued Rail Joints are:

No transportation of rails is required as the joint is made in-situ on the track.
Insulation resistance and pull out strength are comparable to the existing Glued Joints.
A traffic block of about 1 hour is required.
The track can be opened to traffic immediately after assembly of the joint.


Click to enlarge

B. We also manufacture another type of in-situ Insulated Joint. Since no adhesive is needed in this joint, it is not a Glued Joint. Instead the fish plates are made of high strength insulating materials. The fabrication of the joint at site involves cutting, drilling holes, cleaning the rail ends, putting the end post in position and then tightening the insulating fish plates with rails using nuts and bolts. The track can be opened to traffic immediately thereafter. These joints are more suitable for lower loads like metro railways and branch lines.


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The India Thermit Corporation Ltd.
84/22, Fazalganj, Kanpur - 208 012 (U.P.)
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