| 摘要 |
FIELD: mining. ^ SUBSTANCE: proposed invention pertains to techniques of drilling large diameter wells in soft and rocky soils, and mainly for constructing building foundations and supports. The technical outcome of the invention is faster drilling of a large diameter well, as well as increased efficiency of extracting drilled rocks from the well. The column drill has a body frame, an outer core tube and an inner core tube arranged coaxially, as well as a device with discs, for pushing out the core. The inner core tube has vertical recesses in which a jumper link is fitted, joining the discs of the device for pushing out the core. The core tubes have rock cutting elements. The column drill has a mechanism for fixing the device for pushing out the core relative the body, which is in form of a spring-loaded pushing device joined by the top part to top and bottom supports and sleeve pieces, and hinged by an axle to the body of a locking device and a fixing member and an actuator arm. The fixing member can be linked to the sleeve piece, while the actuator arm can be linked to the supports of the pusher. ^ EFFECT: faster drilling of a large diameter well, as well as increased efficiency of extracting drilled rocks from the well. ^ 3 cl, 4 dwg |
