| 摘要 |
FIELD: mining. ^ SUBSTANCE: grooving device for use with drilling rig for drilling multiple parallel crossing boreholes close to each other in such a way that the groove is formed in solid material as rock, stone mansonry or concrete. Grooving device includes guiding part connected to body part by at least one bracket. Guiding part is located in previous drilled borehole; and body part and impact-rotational instrument together form a changeable volume chamber that contains flushing liquid medium that absorbs the transmission of waves form impact stress of impact device to grooving device. ^ EFFECT: increase of device service life due to reduction of impact waves influence on body structure and guiding part of the device. ^ 23 cl, 15 dwg |
