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对在冬季施工安装的220伏动力线路的预应力混凝土电杆检查,发现电杆纵裂纹比正温度施工安装的电杆严重(见下表).在正温度施工安装的电杆中检查了31根电杆,有纵裂纹1根,砸开裂纹处,外保护层厚度只有4毫米,显然是外保护层偏薄,因温度应力而开裂。并发现多数纵裂纹电杆有受撞痕迹。有批104根电杆在冬季平均气温-12℃施工安装一条3万伏高压线路,将电杆埋在夏天挖好的冻土坑内,回填冻土,经一冬开化后,线路呈曲线形,有34根10米电杆从离地面2米至4米处纵裂通顶,裂缝宽0.04～0.8毫米,转角电杆受扭力的一面,裂
For the prestressed concrete poles of the 220V power line installed during winter construction, it was found that the vertical cracks of the poles are more serious than the poles constructed and installed at positive temperature (see the table below). 31 poles were examined in positive temperature installation and installation poles. Root pole, there is a vertical crack, open cracks, the outer protective layer thickness of only 4 mm, apparently thin outer protective layer, cracking due to temperature stress. And found that most of the vertical cracks have been hit by the impact of the pole. A batch of 104 poles were installed and installed at an average temperature of -12°C in the winter to install a 30,000-volt high-voltage line. The poles were buried in excavated permafrost pits in the summer and the permafrost was backfilled. After a winter season, the lines were curved. There are 34 10 meter poles from 2 meters to 4 meters from the ground at the top of the vertical cracks, cracks 0.04 to 0.8 mm wide, the corner of the pole by the torque side, crack