Technology of Qinhuangdao-Shenyang Dedicated Passenger Line
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To meet the increasing passenger and fright transportation demands between Beijing to Shenyang, the QinhuangdaoShenyang dedicated passenger line with a design speed of 160 km·h-1, commenced construction in August 1999 and was open to traffic in December 2002. The first dedicated passenger line in China has the highest operation speed. To ensure the train safety, stability and passenger comfort in tune with the design speed once open to traffic, the QinhuangdaoShenyang dedicated passenger line has applied new design standards: the deficient superelevation allowable for the track is 60 mm in general and 80 mm for difficult conditions; the proposed superelevation ratio of transition curve is 25 mm·s-1 and the general one is 31 mm·s-1; roadbed requirement for the settlement after construction shall be no more than 15 cm, the abutment transition section no more than 8 cm and the settlement ratio less then 4 cm·year-1; the track of the main line is designed to use c. w. r. rails; higher standards are also set for the following design parameters: the vertical and lateral rigidity and longitudinal rigidity of bridge, settlement of pier foundation and deflection (break angle and alternate angle) of rail top on bridge. New design standards have given rise to wide application of new technologies and new structures. The project quality is guaranteed by applying the following technologies: graded ballast for subgrade, transition section of line and bridge, and the technique of laying c.w.r. extra long rail on sleepers that are put one by one in position on the formation in the first place, No.38 turnout, doubletrack prestressed concrete box beam, 300 km·h-1 pantograph, digital/voice simultaneous transmission of wireless train control, and train control interlocking system. Three comprehensive tests on such fields as track maintenance, environmental protection, rolling stock, traction power supply and communication and signaling were carried out consecutively, creating record speed of 2107 km·h-1, 292 km·h-1, 306 km·h-1 and 321 km·h-1 in Chinese Railway history. The successful construction of this dedicated passenger line has established a new mode of separating railway passenger and freight transportation, and symbolized that Chinese Railways have mastered the complete set of technologies and equipment with independent intellectual property right for 200 km·h-1 level dedicated passenger line. It also indicates that the Chinese railway construction techniques have reached a new level and thus laid solid technical foundation for building highspeed railways.