Achieving yet another milestone, the Delhi Metro has become the first in the country and third in the world to use extra long girders to build the elevated stretch of the Airport express line route.The girders, which are 25 metres long and weigh about 120 tonnes each, are being used to expedite the construction process on the line as the schedule for completion of the project is before the 2010 Commonwealth Games.
The use of girders will help the Metro cut its cost by nearly 10 per cent and time by around 20 per cent, a DMRC official said here.
Rail tracks of the Metro would be put on these girders, which are being made at a casting yard in Mahipalpur from where they are carried by specially designed trailers. These trailers are 35 metres long and have 64 tyres.
Two girders, which are placed on the pillars, are separated from each other by a distance of two inches as the girders expand and contract by an inch in summer and winter respectively.
The Airport Express line of the Delhi Metro is a 22.7 km long stretch of which a distance of seven kms is elevated. So far a total of 504 such girders will be used on the elevated stretch out of which 22 have already been launched.
The extra long girders, which are put on the elevated tracks between Buddha Jayanti Park and Mahipalpur of the line, have also been used in the metro in Shanghai and Taipei.
The trains on the Airport stretch will run at a speed of 135 km, making it the one of the fastest in the country as a trip from the New Delhi station to the Airport will take around 20 minutes to cover over 22 kms. If only online poker rooms would load the fast
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