Monday, December 8, 2014

#DelhiMetro is using a method from #Austria for tunneling through narrow spaces known as #NATM. In this method a #TBM (tunnel boring machine ) is not used

Delhi Metro is using a method from Austria for tunneling through narrow spaces known as NATM. In this method a TBM (tunnel boring machine ) is not used 
http://www.wikio.co.uk