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Ⅰ、概况解放初期铁路拱涵采用重力式圬工结构,体积比较大。后来,做了一些修改,结构尺寸有所减小,但基本上仍属于原来的结构形式,圬工体积仍然很大,对于山区铁路,尤其跨越黄土深沟的铁路,涵洞很长,在那些缺砂、缺水,缺石料地方,给施工带来很大困难。重力式拱涵有其构造简单,易于取材的优点,但是遇到上述情况,体积问题就成了施工中的主要矛盾。
I. Overview In the early days of liberation, the railway arch culvert adopted the gravity structure, with a relatively large volume. Later, some changes were made and the size of the structure was somewhat reduced. However, the structure remained basically the same. The size of the workers was still large. For railways in mountainous areas, especially those crossing deep-loess dams, the culverts were long. Sand, water shortage, lack of stone places, to the construction of great difficulties. Gravity arch has its advantages of simple structure, easy to draw, but encountered the above situation, the volume problem has become the construction of the main contradiction.