季节性冻土地区输电线路铁塔坡形和直柱形刚性基础的比较分析

Two Different Types of Transmission Line Tower Foundation Analysis and Comparison in Seasonal Frozen Soil Areas

输电线路铁塔基础在季节性冻土地区往往受到冻胀力的影响,出现上拔和倾斜的情况,在标准冻结深度不大的情况下,若采用灌注桩基础,则会增加工程造价,经济性较差。因此针对适合冻土地区铁塔的台阶式坡形基础和台阶式直柱刚性基础上拔稳定性进行了分析比较,分析结果认为,将基础主柱做成有9°倾角的坡面型式,并将基础底板埋入标准冻结深度线以下,可抵消冻胀力对基础上拱的影响,坡形基础可直接应用于实际工程中,比普通台阶式直柱刚性基础节约混凝土用量,基础尺寸明显减小,给施工带来了便利,提高了工作效率。

Transmission line tower foundation in seasonal frozen soil areas are often subject to frost heaving force, uplift and the inclination of the emergence, in the standard depth of freezing is not too large, the peffusion pile foundation in the largely increasing the construction cost, economic. Through the uplift stability analysis of stepped slope foundation and stepped straight rigid foundation, the foundation main post made with 9° angle of slope type, and the base pXate embedded in standard frost depth below the line, can offset the frost heaving force on the basis of the influence of arch, the sloping base can be directly applied to the actual engineering, than ordinary stepped straight rigid foundation saves the concrete content, basic dimensions also greatly reduced, to bring about the construction of facilities, improve work efficiency.