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近几年来,在全国许多地区,预应力电杆普遍出现纵裂现象,严重地影响着它的使用信誉。我们结合电杆国家标准的编制工作,调研了这个问题并作了碰撞试验,结果如下: 预应力电杆出现纵裂的原因是复杂的,既有内因也有外因。内因是混凝土内部结构的不均匀性,外因主要是吊运过程中碰撞力的
In recent years, in many areas of the country, pre-stressed poles have generally experienced longitudinal cracking, which seriously affects its use reputation. Based on the compilation of national standards for poles, we investigated this problem and conducted crash tests. The results are as follows: The causes of longitudinal cracks in prestressed poles are complex, both internal and external. The internal cause is the non-uniformity of the internal structure of the concrete. The external cause is mainly the collision force during the lifting process.