变电所大部分建筑物为砖混结构 ,其混凝土屋面板与砖砌墙体的膨胀性不同 ,当温差较大、砖砌墙体强度较差时易产生温差裂缝。预防温差裂缝一是减少温差 ,如设置良好的隔热层、隔热板 ,改良反辐射层 ,防止檐板、圈梁外露等。二是在屋盖下设置圈梁 ,增加构造柱 ,提高接近屋盖砖砌墙体的水泥沙浆标号 ,以提高墙体的抗剪强度 ,减少裂缝的发生 Substation most of the buildings are brick-concrete structure, the expansion of the concrete roofing and brick wall is different, when the temperature difference is larger, the strength of the brick wall is easy to produce temperature difference cracks. First, to prevent temperature difference cracks Reduce temperature, such as a good set of insulation, insulation panels, anti-radiation layer to improve, to prevent the cornices, ring beam exposed. Second, set the ring beam under the roof to increase the structural columns and raise the cement mortar mark near the brick wall to increase the shear strength of the wall and reduce the occurrence of cracks