FIELD: mining.
SUBSTANCE: drilling tool comprises a drill bit (2) connected to the drill rod (1) by a connector (3) of the drill bit. The drill rod is made of sections (11) of the drill rod. Each section of the drill rod comprises an inner section (111) of the rod and a hollow outer section (112) of the rod. The inner section of the rod is fixed with the ability of rotation in the outer rod section. The inner rod sections are joined together and form the inner rod (11') of the drill rod. The outer rod sections are connected together and form the outer rod (12') of the drill rod. The inner rod is connected to the output shaft of the power unit, and the outer rod is rigidly connected to the housing of the power unit.
EFFECT: reduction of friction force between the drill rod and the borehole wall.
14 cl, 7 dwg
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