一些建(构)筑物,如地下室、水池、油罐等箱形结构,有的当年不能交付使用,必须越冬跨年施工。由于东北地区负温期长、温度偏低,因此地基土的最大冻结深度比较大。另外,这些建(构)筑物的底板,一般低于自然地平,相对地提高了地下水位,使冻结速度和冻结深度都可能相对地增大。一旦缺乏完善的越冬维护措施,将会出现两个方面的质量问题:其一由于基土在冬 Some buildings (structures), such as basements, pools, tanks and other box-shaped structures, some can not be delivered for use that year, must cross the winter construction. Due to the long negative temperature period and low temperature in Northeast China, the maximum frozen depth of foundation soil is relatively large. In addition, the floor of these buildings (structures) is generally lower than the natural ground level, and the groundwater level is relatively increased, so that the freezing speed and the freezing depth may be relatively increased. Once the lack of perfect winter maintenance measures, there will be two aspects of quality problems: one is due to the base soil in winter