BURSTER TURBO-DRILL

FIELD: drilling machinery and equipment. SUBSTANCE: this turbo-drill is used for drilling bore-holes of extra-large diameter in bottom sedimentations in bays and rivers. Installed and cemented in these bore-holes are piles with diameter of 700-1500 mm which are required in construction of berths, overpasses and bridges. Turbo-drill is made up of stator axle which by its upper adapter is connected with flexible hose which is used to deliver water by pumps to turbo-drill. Stationary secured on stator axle by means of nut are stator components of axial step bearing, stator stages of turbine pressure, stator bushes of radial supports. Stationary secured in body-rotor of turbo-drill by means of flanges are rotor components of axial step bearing, rotor stages of turbine pressure, radial supports. Fastened in adapter body are rims which are aimed at deflecting water stream in direction opposite to direction of rotation of turbo-drill body. Secured to adapter of turbo-drill body is vortex hydraulic brake. Attached to its lower thread is drilling bit. Application of aforesaid embodiment of turbo-drill allows for increasing its operational reliability due to reduced loads on its axial step bearing at ensuring optimal lower rotation frequency of drilling bit. EFFECT: higher efficiency. 1 cl, 5 dwg