根据形势的发展,我们应当综合考虑铁路桥梁的微观经济与宏观经济,尤其是时间价值的重要性,以便充分发挥其经济效益。本文对此问题作了一些探讨,并就:1.时间价值的重要性及其近似估计;2.设计新构思及其经济效益;3.桥梁建筑高度(h)小的经济效益;4.铁路预应力桥梁发展方向的商榷四个问題谈了初步的看法。 According to the development of the situation, we should consider the importance of the micro-economy and the macro-economy of railway bridges, especially the time value, in order to give full play to their economic benefits. This article made some discussions on this issue, and on: 1. The importance of time value and its approximate estimation; 2. Design of new ideas and their economic benefits; 3. The bridge building height (h) small economic benefits; 4. Railway Prestressed bridge development of the four issues to discuss the initial view.