EXCAVATOR FOR BORING THE GROUND CAPABLE OF PREVENTING THE ABRASION OF A SCREW WING AND THE SEPARATION OF HARD METAL PIECES AT EXCAVATION WORK BY ATTACHING A HARD METAL PIECE TO BE PROJECTED TOWARD THE OUTSIDE OF A SCREW WING, AND SIMPLIFYING EXCAVATION AND PREVENTING THE DAMAGE BY A LONG-TERM USE BY INCREASING THE WHOLE STRENGTH OF AN EXCAVATOR, AND THE MANUFACTURING METHOD

摘要

PURPOSE: An excavator for boring the ground is provided to prevent the damage and abrasion of a screw wing by welding hard metal pieces to be projected to the outside of a screw wing, to prevent the separation caused by crushing into the firm ground by inserting hard metal pieces to fitting grooves, to heighten the strength of an excavator by forming a center shaft of an excavator in the long cylindrical shape, to excavate the firm ground easily by additional front screw wings and to discharge the excavated soils to the outside easily. CONSTITUTION: The excavator(1a) for boring the ground comprises a center shaft(2a), a screw wing(3a) fixed on the outer circumference of the center shaft(2a), and a drill fastener(4a) formed on the upper part of the center shaft(2a) to be fixed with a drill. The center shaft(2a) of the excavator(1a) is formed in a long cylindrical shape, the screw wing(3a) is fixed on the outer circumference of the center shaft(2a), the drill fastener(4a) is formed on the upper part of the center shaft(2a) to be fastened with a drill, an excavation bit fitting groove(6a) is formed on the lower end of the center shaft(2a) to install a triangular excavation bit inward, fitting grooves are formed on the outer side of the screw wing(3a) at regular intervals to insert and weld hard metal pieces(7a), and a portion of the hard metal pieces(7a) are projected to the outside of the screw wing(3a) not to be worn away.