Last two TBMs for Phase III of Delhi Metro delivered
7 January 2014Terratec delivered the last two of eight TBMs for Delhi Metro towards the end of November, the company announced recently. The TBMs were officially unveiled at a ceremony that included representatives from the client, a JV between Hindustan Construction Company of India and Samsung Engineering & Construction Group of Korea.
The TBMs are to excavate in typical Delhi soil, mixing silt, sand and clay in different proportions without presence of rock. For this the JV selected a 6.52m EPB machine with a classic soil configuration and equipped with a Spoke-Type CutterHead with a 57 percent opening ratio, which has been proven to be efficient to excavate this type of soil in previous DMRC Phases, Terratec stated.
Terratec said it designed the cutterhead to allow the cutting tools to be exchangeable for 17in roller disc cutters, making the TBM to be able to bore through the D-walls and cope with the presence of any unexpected obstacle on its way, such as old wells or foundations.
The segment lining will be made of RC segments with an outer diameter of 6,350mm, inner diameter of 5,800mm and width of 1,400mm. The total combined distance that each TBM will bore to is approximately 1,900m.
Once these two TBMs are launched at the site, there will be a total of eight Terratec TBMs excavating in Delhi through all 2014 and part of 2015, the company announced.
