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陕北黄土高原上,由于冲沟被雨水累年冲刷侵蚀,形成无数沟壑天堑,人畜跨行颇不容易,公路通过更成问题。为了便利交通,避免绕行的困难,陕北劳动人民用很陡的边坡,夯筑高填路堤接连起来,形成一条平坦道路,即名为土桥。我段所辖西(安)宋(宋家川)公路,解放以来,为适应运输需要,从宜君至延安段,这样新修和加固的土桥共有十处。除新建柳树沟、羊圈坡两处土桥外,其余八处旧有上桥桥面狭窄、行车危险,都是在各种不同地形和情况下,用各种方法加固起来的。旧有土桥加宽加固工作,较新建土桥技术更为复杂,其中有的是一次
On the Loess Plateau in northern Shaanxi Province, as the gully is eroded by the rainy years, it forms numerous gully moors, and it is not easy for people and animals to cross the road. It is even more problematic for roads to pass. In order to facilitate traffic and avoid detours, working people in northern Shaanxi use very steep slopes and rammed high embankments to form a smooth road called the Tuqiao. I section under the jurisdiction of West (An) Song (Song Jiachuan) highway, since liberation, in order to meet the transport needs, from Yijun to Yan’an section, such a new repair and reinforcement of a total of ten soil bridge. In addition to the new Willow ditch, sheep ring slope two soil bridge, the remaining eight old bridge deck is narrow, dangerous traffic, are in a variety of different topography and circumstances, with a variety of ways to reinforce it. The old soil bridge to broaden and reinforce the work, newer soil bridge technology more complex, some of them once