Abstract
The paper discusses approaches to improvement of equipment for borehole drilling with a predetermined trajectory in construction of underground utility systems and facilities. Piercing method allows implementing dry drilling of boreholes with small diameter using simple technical equipment. The methods used when preparing the research are analysis, generalization, and experimental research methods. Outcomes of the research include evidence that increase in performance of vibro-impact piercing is possible not only due to higher impact energy, but also due to optimization of interaction between the operating tool and soil. Combination of dynamic action by impact pulses and static forces applied to the drilling equipment enables to enhance performance of impact pulse action and increase the drilling speed. Accuracy of the borehole trajectory can be provided by using dynamic stabilizers or correcting the drilling direction due to asymmetrical tool shape in combination with the torque moment of a drilling equipment. The study formulates requirements to design of a drilling unit for directed pilot hole drilling by dynamic piercing method. The design of an improved pneumatic tool installed in front of the drill string and equipped with asymmetrical front head is described. Experimental research results are given on the process of a borehole drilling using the described tool.
Highlights
Borehole drilling in the rock mass is an important part of the upstream technologies for mineral deposits
The results of this research showed that significant increase in the borehole drilling rate using vibro-impact operating tool is achieved due to simultaneous application of pulse impact and static loads
This effect is obtained without increase in impact pulse energy by enhancing efficiency of its operation
Summary
Borehole drilling in the rock mass is an important part of the upstream technologies for mineral deposits. Methods based on impact techniques of borehole formation are the most promising They potentially enable to significantly increase drilling speed without the increase of operational resources of technical equipment [7]. Impact machines are the source of vibrations and noise and the preferable direction of the technology development is achievement of the effect not by increasing the impact energy of the machines, but due to optimization of interaction between the operating tools and soil [8] These processes are insufficiently studied, while having high potential for increasing performance of impact pulse action for moving the operating tool [1]. Using these potential reserves will enable to significantly improve technical and economic parameters of the studied technological processes and develop novel mixed technologies combining different drilling methods
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
