Non-Dig Directional Mechanism Research on Hard Rock Stratum

Non-dig underground pipeline laying technology is used widely in municipal construction, railway transportation, communications, water conservancy and transportation of petroleum and natural gas fields. Hard rock Non-dig construction is a construction field with high technology and construction difficulty in recent years. This paper analyzed the current domestic and international hard rock directional methods and types by used and pointed out its advantages and disadvantages, and putted forward a swing driving mode combined with the eccentric bit and DTH to realize Non-dig directional drilling in hard rock. The directional drilling principle is that in directional drilling the eccentric bit lateral force as a fulcrum deflection drilling through the swing mechanism, in order to avoid the drill pipe in curved segment of the cycle characteristics of destruction. On the other hand normal drilling is to use the swing mechanism and the drill pipe coordination with turn slowly to reduce drill speed and the drill pipe damage. The orientation principle is analyzed to solve oriented technology problems and key technologies in hard rock the Non-dig drilling and provides a new method.