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1958年大跃进以来,旧線改造中,为了消灭现有線路上的轨束梁(这种梁在列车通过时,挠度很大,常使桥面線路产生吊板现象)并用钢筋砼梁来代替它,就必须另行寻求降低建筑高度的措施,这样,才能在维持原有線路标高的情况下,完成改造任务。此外,很多旧有線路上的钢梁经过几十年的运营,目前已经达到了它的使用寿命期限,需要更换如沈阳局管内就有700多孔。这些梁的建筑高度一般都比较低,要更换它,也必须寻求一种建筑高度较低的结构。再者,平原地区線路上的桥梁和枢纽站(土人力)内的跨線桥,为了降低路基高度,减少土石方,达到少占艮田,节约劳动力的目的,也同样需要建筑高度比较低的钢筋砼梁。
Since the Great Leap Forward in 1958, in the reconstruction of the old line, in order to eliminate the rail beam on the existing lines (such beams greatly deflect when the train passes through and often cause bridge phenomenon on the deck line) and replace it with reinforced concrete beams , We must separately seek to reduce the height of the building measures, so as to be able to complete the transformation of the original mission in the case of elevation. In addition, the steel beams on many older lines, which have been operating for decades, have now reached their useful life and have more than 700 holes to be replaced, for example, in Shenyang. These beams are generally of relatively low building height, and to be replaced, one must also look for structures of lower building height. Furthermore, bridges and bridges in the plains area (earthwork) are required to reduce the height of embankment and earth and stone, to reduce the occupation of land and to save labor. It is also required to use steel with a relatively low building height Concrete beam.