水电部生产离心混凝土电杆已有三十年的历史,其中预应力钢筋混凝土电杆从六十年代中期开始使用到目前也已有二十年,近几年比较普遍的发现了纵向裂缝质量问题。它们产生的原因是多方面的。各地处理的方法也不一致。广东省于六十年代中期开始利用低碳冷 The Ministry of Water and Electricity has been producing centrifugal concrete poles for more than 30 years. Pre-stressed reinforced concrete poles have been in use since the mid-1960s and now have been used for 20 years. In recent years, the quality of longitudinal cracks has been found more commonly. . There are many reasons for them. The methods that are handled everywhere are also inconsistent. Guangdong Province began to use low-carbon cold in the mid-1960s