SMART Tunnel

The Stormwater Management and Road Tunnel, shortly SMART, is a tunnel in the Malaysian capital Kuala Lumpur. Was built the tunnel from June 2004 to May 2007 by the German company Wayss & Freytag from Frankfurt am Main. It was built in two sections with a length of 5,400 and 4,050 m in the so-called shield tunneling method. Here, about 50 cm thick and 1.70 m long tunnel lining segments were used. Each of these eight lining segments form a ring together with a capstone.

In the middle part 3 km of the tunnel comprise three layers after the completion of, the upper two are provided for each of the two lanes North Drive. These two are connected at regular crosscuts section to each other so that in an accident in one plane can be used as an escape route. The lower third level is the derivation of floods during the monsoon season. A special feature is that with especially heavy rains the tunnel can be closed and the two upper tubes can also be used for the drainage of flood.

The machines used in the construction had an outer diameter of 13.21 m and a capacity of 4,000 kW. This produced a torque of 24,400 kNm.