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这些年来,发现部份灌注桩在修建几年以后,于常水位或冰冻部份出现环蚀现象,混凝土逐层剥落破坏,失去强度,桩钢筋外露,个别严重处蚀深达7-10厘米,它严重地影响了桩柱的强度和耐久性,必将缩短桥梁寿命。一九七五年西北道路病害防治经验交流会专题座谈讨论纪要中指出:“桥梁基础,多年冻土地区钻孔灌注桩比较成功,但修建
Over the past few years, it has been found that some bored piles exhibit cyclic corrosion phenomena at the normal water level or in the frozen part after being built for several years. The concrete is peeled off by layers and loses its strength and the exposed reinforcing steel bars are exposed. Some deep erosion reaches 7-10 cm in depth, It has a serious impact on the strength and durability of piles, will shorten the life of the bridge. In the Minutes of the Symposium on Symposium on Experiences in Northwest Road Disease Prevention and Control in 1975, it was stated in the minutes of the discussion: "Bridges foundations, bored piles in permafrost regions have been relatively successful,