1. Introduction of horizontal directional drilling The horizontal directional drilling is without excavation surface conditions, laying a variety of underground utilities (Rohre, Kabel, Etc.) of a kind of construction machinery, it is widely used in water supply, Strom, Telekommunikation, Gas, Gas, oil and other pipeline construction, es ist für Sand geeignet, Ton, pebbles and other DeKuang, most of the hard rock …