Use of Post-Tensioning Systems in world's largest BOT project in Taiwan

Taiwan’s largest infrastructure project ever, the on-going Taiwan High Speed Rail Project surpasses all Build-Operate-Transfer (BOT) construction projects worldwide in terms of its cost US$ 15 billion. The north-south THSR line runs approximately 345 km from Taipei to Kaohsiung, passing through 14 major cities and counties as well as 77 townships and regions. A total of 12 passenger stations are situated along the route.

The civil works, divided into 12 separate contracts, comprise some 63 km of tunnels, 252 km of viaducts and bridges and 30 km cut and fill.

The high-speed train, manufactured by the Japanese Shinkansen System, will travel at a speed of 250-300 km/h in 90 minutes the distance that now takes up to ten hours to drive on the freeway.

Taiwan is located in an area where earthquakes and typhoons frequently wreak havoc. Additionally, difficult geological conditions are encountered along the route. The alignment crosses three active fault zones, thereby making design and construction standards considerably stringent in order to ensure the safety of high-speed train operations.

The high land utilization along the alignment requires nearly 73 % of the route to be carried on viaducts and bridges. Prestressed concrete box girders, 13.6 m in width carrying two tracks are the preferred structure for the main line viaduct sections.

Along the alignment there are also 47 tunnels traversing sandstone, shale, mudstone or gravel formations; four of them are longer than 2 km.

DSI Taiwan has been profoundly involved in this major project since 2002 in terms of construction of cantilever segmental bridges by using DYWIDAG Formtravellers as well as supply of DYWIDAG Bar and Strand Post-Tensioning Systems.

There is a total of 56 free cantilever bridges throughout the entire 345 km. DSI Taiwan is supplying 30 sets (two sets per pier) of formtravellers to C280 Lot 1, C280 Lot 2, C291 and C295 participating in the construction of 16 free cantilever bridges. In addition, DSI is supplying 7,642 MA anchorages to C220.

Completion of civil works and opening for passenger services are expected in the course of 2004 and 2005, respectively.

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