HDD) , the main method in Trenchless Technology, has become widely used for urban underground installation of new pipelines with its unique technical advantages.

• 随着非开挖技术的迅猛发展,水平定向钻进(HDD)技术以其独特的技术优势,在目前城市地下管线铺设工程中起着越来越重要的作用。