Abstract
The paper overviews trenchless utility installation techniques and prospects of further development of horizontal directional drilling technology to drill small diameter pilot holes. The improved design is suggested for the thread connection of drill pipes and hydraulic system to generate power pulses.
Highlights
Infrastructure and housing development led to the increase in construction of underground utility and transport systems
The trenchless technology used for the underground utility systems is based on the formation of subsurface pilot holes drilled in soil with the possibility of further extension up to the required diameter
The improved design of percussion mechanism is suggested for the percussive drilling machine comprising the hydraulic pulsator connected with the drive; the fluid-pulse shape correcting device; hydraulic power cylinder with piston contacting with the drill string shank
Summary
Infrastructure and housing development led to the increase in construction of underground utility and transport systems. The trenchless technology used for the underground utility systems is based on the formation of subsurface pilot holes drilled in soil with the possibility of further extension up to the required diameter. The invention of hydraulic pipe pushing machines and vibratory hammers allowed improving it greatly. The former implies a high-pressure water-jet to washout soil before using a rock cutting tool; the latter uses spinning counter-weights to create vibration to the pile, which allows it to "cut" soil into the ground. Controlled method of trenchless utility installation is performed by drilling machines and relates to horizontal directional drilling that includes several stages such as pilot hole drilling, hole reaming, and pipeline laying.
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