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A mix of Atlas Copco stationary and portable air compressors are being used to supply compressed air requirements for the tunnelling and surface works on the Avrasya Metro Grubu Joint Venture project as Istanbul’s metro is extended in the Asian side of the city.
The extension, being undertaken by the Avrasya Metro Grubu Joint Venture, involves the construction of a 21.7km double-track underground line to be carried out by NATM Method ( drilling & blasting) with 16 stations, and 4.5km double-track section of tunnels (Kartal – Kaynarca Extention) being driven with two tunnel boring machines (TBMs).
A GA 30 FF electrical compressor supplying 90 l/sec and a GX7 FF-10 supplying 16 l/sec are mounted on bogies inside the tunneling shields and supplying air at pressures of up to 8 bar, while two GA 110 P electrical oil-injected screw compressors, each producing 356 l/sec at a pressure of 8 bar, are stationed at the head of the working shafts as reserve supply.
The JV is also using a number of Atlas Copco portable oil-injected rotary screw compressors for surface work, including two XAMS 407 units that provide a free air delivery of 400 l/sec at 8.6 bar, one XAHS 186 that supplies 175 l/sec at 12 bar, and one XAS 97 that supplies 89 l/sec at 7 bar.
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The first stage of the Istanbul Metro was opened in 2000 as a fully underground line with 10 stations, but it runs only on the European side of the city. The second stage, now under construction, will run on the Asian side between Kadikoy and Kartal and the two sections will be connected via a tunnel under the Bosporus, which is being built under a separate contract. The second stage is due to enter service in 2012.
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