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一、问题提出××铁路通过海拔四千四百米以上的高原多年冻土地区约六百公里,桥涵约有一百余座,总延长约六公里。高原气候条件恶劣,日温差大,年一日内出现正负温的天数比我国东北严寒地区还高出一倍左右;高原河流水质含可溶性固体量较高,一般达数百毫克/升至数千毫克/升。高原的自然条件给予桥涵基础混凝土造成极为严酷的冻融一腐蚀的工作条件。
First, the issue put forward that the XX railway passed the plateau permafrost area at an altitude of 4, 400 meters and above, about 600 kilometers in length, and about 100 bridges and culverts, with a total extension of about 6 kilometers. The weather conditions at the plateau are bad, the daily temperature difference is large, and the number of days with positive and negative temperatures in the first day of the year is twice as high as that in northeast China. The water quality of plateau rivers is high with soluble solids, usually up to hundreds of milligrams per liter, Mg / l. The natural conditions of plateau give bridges and culverts basic concrete caused extremely harsh freeze-thaw corrosion conditions.