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国民经济的持续发展,势必要求铁路的运力相应增长。凡需增建二线的区段,必是运输繁忙,能力饱和,单线难以维持的干线。在繁忙的干线上修建复线,施工干扰大,运输一紧,施工就停,路料运输难,施工要点难,施工与运输兼顾难。因此,过去一般较长的复线建设工期都较长,不少达十年之久,有的甚至长达三十年以上,严重地影响了国家投资效益的发挥。
The continuous development of the national economy is bound to require a corresponding increase in the capacity of the railway. Where the need to build second-line section, it must be busy transport, capacity saturation, difficult to maintain a single line trunk. In the busy trunk line to build double-line, the construction of large interference, transport a tight, construction stops, road transport difficult, difficult construction points, both construction and transport difficult. Therefore, in the past, the construction period of longer double-track construction was rather long, not less than 10 years long, and some even more than 30 years, seriously affecting the country’s investment efficiency.