Herrenknecht TBM Breaks Through DTSS Tunnel T-05 in SingaporeSembcorp Engineers and Constructors successfully completed the 12.3 km Kranji tunnel as part of Contract T-05 for the Public Utilities Board's Deep Tunnel Sewerage System (DTSS) in Singapore. The north TBM arrived at Shaft I on 24th January, 2005 after excavating 7,469 m of tunnel in the most challenging ground conditions in South East Asia. The excavated diameter is 4.93 m for an internal diameter of 4.6 m at the outer surface and 4.1 m at the inner surface. The tunnel is lined with five concrete segments plus one key. The EPB shield worked in pressures of up to 4 bar. Geology was composed of fresh granite, mixed faces, sand, silt and clays. A screw conveyor and conveyor belt poured the muck into four 12 cu m Muellhauser muck cars pulled by one Schoema loco. Visit www.tunnelling-equipment.com and www.schoema-locos.de. The best shift installed 16 rings (22.4 m), while 30 rings (42 m) have been installed during the best day, 150 rings (210 m) during the best week and 450 rings (630 m) during the best month. Click sg/11. Subscribe to E-News Weekly 27/2003. Visit www.dtss.com.sg and www.herrenknecht.com 08/05.