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在山岳地带高速公路上,桥梁的基础工程往往采用由人工开挖的现场灌注的钢筋混凝土桩,即所谓的挖孔灌注桩。这是为了确保桥梁基础的稳定,一方面把由于机械大规模开挖山岳斜面而产生的自然破坏控制在最小限度内,一方面使开挖后的斜面地形接近现场地形,以防此地基强度下降。 1977年制定了本设计标准(草案)。
In the mountainous areas of the highway, the basic construction of the bridge often used by the artificial excavation of the scene of the pouring of reinforced concrete piles, the so-called dug pile. This is to ensure the stability of the bridge foundation. On the one hand, to minimize the natural damage caused by mechanical large-scale excavation of mountain slopes, on the one hand, the bevelled terrain should be close to the site topography to prevent the strength of the foundation from decreasing . 1977 Developed this design standard (draft).