The present invention relates to a soil drilling apparatus.
These soil drilling apparatus of the present invention, post-frame, the upper and lower auger, a screw rod, drilling stirring rod, a casing clamp, of soil drilling apparatus consisting of the auger casing the casing clamp casing is installed between the lower auger bottom and casing clamp top through the binder means is rotatably spaced apart from the lower end of the lower auger is installed, the outer peripheral surface formed on the auger casing pivoting pull-out means of the casing clamps are installed to face each other, right and left with a casing clamp in accordance with the auger casing return operation of the pull-out means and the auger casing embedded in the ground by swinging through the action of the auger casing is rotated lowering the contact pressure of the ground for the auger casing into the ground characterized in that pull-out.
In addition, the drilling stirring rod of the outermost stirring blade rotating bit at both sides perforated pressure through the drilling stirring rod rotating with the screw rod in accordance with the operating and fall of the upper auger outwardly pivoting as the diameter of the outermost stirring blade being expanded and while rotating the bit is pulled out during the inward pivoting of the excavation according to the stirring rod above the auger increases characterized in that the pivoting means of the bits forming the free-pivoting manner while the diameter of the outermost stirring blade having a reduced more.
Therefore, in accordance with the present invention, soil on the auger casing at the auger casing pull-out of large diameter (more than 2000mm) embedded in the ground with a swinging action of the auger casing it is left rotated together with the casing clamp in accordance with the driving of the auger casing pivoting pull-out means in the can by reducing the surface pressure more easily the auger casing of the frictional force reduction drawn to the surface and, at the same time, puncturing the pressure during pivoting bit is outwardly through the drilling stirring rod rotating with the screw rod in accordance with the operating and fall of the upper auger rotation as the diameter of the outermost stirring blade being expanded, while rotating the bit is inwardly rotated during withdrawal of the drilling stirring rod according to the upper auger rise can be drawn out the drilling stirring rod in a state that the diameter of the outermost stirring blade decreased and at the same time, an excellent effect such that simplify the auger casing in the drilling hole punched through the stirring rod equipped with a rotating drilling bit means the freedom to be pivoted manner as above night.