深井式排流地床在管道交流干扰防护中的应用

Application of deep-well drainage ground bed to the AC interference mitigation of pipelines

随着中国城市管网、公共走廊设施的快速建设,埋地管道受临近电气化铁路、高压输电线等干扰源的交流干扰影响日益严重,管道交流腐蚀问题尤为突出。埋地管道交流干扰防护主要采用排流器+浅埋式排流地床的防护方式,但对处于城市管网等受地理条件限制区域,以及沙漠、山区等高电阻率地区的受干扰管段,该排流方式的现场施工及排流效果受到严重影响。以大连-沈阳天然气管道(大沈线)为例,将管道阴极保护深井阳极地床的施工经验应用于管道交流干扰防护中,实践表明:选取合理的深井位置、深度、数量及地床材料,管道交流排流效果显著,且征地面积小、施工便捷、散流效率高,能够有效降低第三方施工损坏的风险。(图4,参20)

With the rapid construction of urban pipeline networks and public corridor facilities in China, the AC interference to buried pipelines from the nearby interference sources （e.g. electrified railway and high-voltage transmission line） is becoming more and more serious, especially the AC corrosion of pipelines. The AC interference of buried pipelines in China is mainly mitigated by means of drainage device ＋ shallow drainage ground bed. As for the interfered pipeline sections in the areas where urban pipeline networks are geographically restricted and those with high soil resistivity （e.g. desert and mountain area）, however, the field construction and drainage effect of this method are impacted seriously. The deep-well drainage ground bed is applied in Dalian-Shenyang gas pipeline for AC interference mitigation. It is revealed that if the position, depth and quantity of deep wells and the material of ground bed are selected appropriately, the AC drainage effect will be remarkable with small land area, convenient construction and high drainage efficiency and the damage risk of the third party＇s construction can be reduced effectively. （4 Figures, 20 References）