整体型绝缘接头绝缘环应力分析

Stress analysis of insulation ring in integral insulation joints

对绝缘接头在制造、安装、使用过程中绝缘环的应力分布及其影响因素进行了分析。分析结果表明,绝缘环的压应力与绝缘接头制造时的预压应力有关,预压应力越高,绝缘环的压应力也越高且绝缘环2的压应力高于绝缘环1的压应力。在轴向压力和弯矩的共同作用下,最大压应力发生在绝缘环1的弯矩压缩区,该区域绝缘环边缘有可能在轴向压力和弯矩共同作用下首先被压碎。在轴向拉力和弯矩的共同作用下,最大压应力发生在绝缘环2的弯矩压缩区,该区域绝缘环边缘有可能在轴向压力和弯矩共同作用下首先被压碎。绝缘接头在安装和使用运行中的最大压应力,不仅与制造时的预紧应力和管道轴向应力有关,还与绝缘接头的几何参数密切相关。在相同的管道轴向应力下,大口径管道中绝缘环的最大压应力比小口径中绝缘环的最大压应力大得多。

The stress distribution and its influencing factors of insulation rings are analyzed during manufacture, installation and operation of integral insulation joints. The results show that compressive stresses in insulation rings relate to the prestress applied to insulation rings during manufacture. The higher the prestress is, the higher the compressive stresses in insulation rings are and the compressive stress in insulation ring 1 is higher than that in insulation ring 2. Under the combination of axial pressure and bending moment, maximum compressive stress occurs in the compression zone of insulation ring 1 and the edge of this region can be crushed firstly. Under the combination of axial tension and bending moment, maximum compressive stress occurs in the compression zone of insulation ring 2 and the edge of this region can be crushed firstly. The maximum compressive stress of insulation rings during the installation and operation of insulation joints not only relates to the prestress of manufacture and the stress of pipeline, but also relates to its geometry factors closely. The maximum compressive stress of insulation rings in large diameter pipeline is much larger than that in small diameter pipeline under the same stress of pipeline.