管道在施工过程中,会遇到各种形式的障碍物,如何采取安全、经济、有效的方式穿越是施工单位需要重点考虑的问题。定向钻穿越因其适应性强、精度高、污染小等优点受到大范围推广。本文介绍了定向钻穿越的适用范围、施工流程,重点说明了钻导向孔、预扩孔与管线回拖三个程序的技术要点,对现场施工具有较强的指导意义。 In the process of construction, the pipeline will encounter various forms of obstacles. How to adopt safety, economy and effective ways to cross is a key issue for construction units. Directional drilling through its adaptability, high precision, low pollution and other advantages of a wide range of promotion. This paper introduces the application scope and construction flow of directional drilling, and focuses on the technical points of drilling pilot hole, pre-reaming and pipeline back towing, which is of great guiding significance to on-site construction.