E3S Web Conf.
Volume 233, 20212020 2nd International Academic Exchange Conference on Science and Technology Innovation (IAECST 2020)
|Number of page(s)||5|
|Section||NESEE2020-New Energy Science and Environmental Engineering|
|Published online||27 January 2021|
Construction technology and parameter calculation of air drilling with raise boring machine
1 Mine Construction Branch, China Coal Research Institute, Beijing 100013, China
2 Beijing China Coal Mine Engineering Company Limited, Beijing 100013, China
3 National Engineering Laboratory for Deep Shaft Construction Technology in Coal Mine, Beijing 100013, China
* Corresponding author: firstname.lastname@example.org
Based on the characteristics of raise boring technology and air drilling technology, the construction equipment and process of raise boring with air as circulating medium are studied. Raise air drilling equipment includes the hydraulic control system, the air-cooled cooler and the air compressor. The drilling process is that the bit is cooled by the high-pressure air, at the same time, the broken rock debris generated in the drilling process are discharged to the ground, and the high temperature hydraulic oil is cooled by the air-cooler cooler. By the study above, the problems are solved effectively such as heat dissipation, cooling and rock debris collection and discharge in the process of construction with raise boring machines without drilling fluids. Based on the basic assumption and the aerodynamic theory, the circulation system pressure of the raise air drilling is studied, the calculation method and formula of the annular pressure drop, bit pressure drop and rod pressure drop are presented. The research results can provide theoretical guidance and technical support for the application of raise air drilling technology.
© The Authors, published by EDP Sciences 2021
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