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1958年大跃进以来,在旧线改造中为了更换现有线路上的轨束梁及槽型梁。首先提出了采用高度比较低的(?)梁的要求,同时很多旧有线路的钢梁经过几十年的运营,目前已经达到了使用期限,也需军用比较低的(?)梁来代替。为了支援农业,在平原地区线路上的桥梁和站埸内的跨线梁也应降低建筑高度,以减少土石方,少占良田,节约劳动力,这也需要建筑高度比较低的(?)梁的设计。在这种客观形势推动下。各院各局先后设计并采用了各种型式的压低高度的(?)梁。归纳
Since the Great Leap Forward in 1958, in the reconstruction of old lines, rail beams and trough beams on existing lines have been replaced. First of all, the requirement of using low-altitude (?) Beams is proposed. At the same time, the steel beams of many old lines have been operated for several decades and have now reached the expiration date. In order to support agriculture, the cross-girders in the bridges and stations in the plain areas should also reduce the height of buildings to reduce earthwork, reduce farmland occupation and save labor, which also requires the design of low-height beams (?) . Driven by this objective situation. Each hospital bureau has designed and adopted various types of depressing height (?) Beams. induction