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历年轨温变化幅度超过90℃的地区称为寒冷地区,寒冷地区铁路干线的总延长近两万公里,均担负着繁重的铁路运输任务。为改善和加强这些地区的轨道结构,迫切需要铺设无缝线路。经过多年艰苦卓绝的努力,寒冷地区无缝线路区段不仅保证了行车安全,还创造了可喜的社会效益和经济效益。然而随着我国超长超重列车的开行和列车运行速度的不断提高,寒冷地区现有无缝线路区段的运营条件已经发生了很大变化。它们能否适应不断提速的要求,寒冷地区在高速、重载条件下能否继续扩大铺设。我们对上述问题的回答是肯定的。
Over the years, the rail temperature change range of more than 90 ℃ is called the cold area, and the total extension of the railway lines in cold areas is nearly 20,000 kilometers, both of which carry heavy rail transportation tasks. In order to improve and strengthen the orbital structure in these areas, there is an urgent need to lay a seamless line. After years of painstaking efforts, the seamless railway section in the cold area not only ensures traffic safety but also creates gratifying social and economic benefits. However, with the continuous operation of China’s long and overweight train and the continuous increase of the train running speed, the operating conditions of the existing seamless railway section in the cold region have undergone great changes. Whether they can adapt to the ever-increasing speed requirements, cold areas in the high-speed, heavy conditions can continue to expand the laying. Our answer to the above question is affirmative.