多管并排水平定向钻施工管线的探测研究

Research on HDD Several Parallel Underground Pipeline Detection Technique

HDD平行管线是指HDD地下管线的走向一致、间距小于2倍埋深。由于电磁场的相互感应和叠加，使探测工作非常困难。本文简述管线探测电磁场理论基础，为减小邻近管线信号干扰，提高管线探测效果，探测它们时选择直连、频率、电流、远端接地的措施十分重要。列举一个广州市3管并排HDD管线探测工作实例。

HDD parallel pipehne is that their direction is the same and their interval level distance is less than twice depth which over itself. For the electromagnetic fields inducing and stacking one another, it is very difficult to detecting them. the electromagnetic field theory basic is introduced in these paper, to reduce signal disturbance produced by adjacent pipeline and increase its pinpoint effect, it is important to select properly measures in direct connection, frequency, electric current and far grounding and so on. Finally give a example of probing its 3 Parallel HDD pipes detecting in Guangzhou city.