Chapter: Civil : Railway Airport Harbour Engineering : Railway Engineering : Modern Welded Railway Track

Switch Expansion Joint

Switch Expansion Joint
The switch expansion joint is a device installed at the end of LWRs to allow the thermal expansion of the breathing length.

Switch Expansion Joint

 

The switch expansion joint (Fig. 17.5) is a device installed at the end of LWRs to allow the thermal expansion of the breathing length. Presuming a breathing length of 100 m for a BG track and a maximum temperature variation of 35 o C from the mean temperature in India, the breathing length would shift or move by approximately 20 mm from its mean position. Switch expansion joints, however, are designed to accomodate a total length modification of 60 mm. The extra allowance has been made to cater to the likely occurrence of fractures in the breathing length, creep, and the wrong positioning of the SEJ. Switch expansion joints are situated at the ends of LWRs, i.e., after a length of 1 km or so. They are positioned in the facing direction in the case of double lines and in the direction of heavier traffic in the case of single lines.

 

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Civil : Railway Airport Harbour Engineering : Railway Engineering : Modern Welded Railway Track : Switch Expansion Joint |


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