Trenchless drilling rigs use high-pressure water jets to cut holes in soft ground. The directional drilling bottom drilling tool is composed of an elbow joint and a drill bit with a nozzle. Drill string back to straight hole. If the drill string does not rotate, under the action of feed force and water jet, a directional arc hole can be …

During the construction of trenchless drilling rigs, improper placement of the pipe joint sealing ring or damage to the pipe end due to uneven force will cause soil erosion, resulting in ground settlement and uplift. If the thixotropic mud anti-friction technology is used for pipe jacking construction, the leakage of pipe joints will also cause the loss of thixotropic mud, …