Abstract:  Foundation drilling in various soil and rock strata is achieved by using different drill bit and augers. This paper presents a case history of auger and drill bit selection so that different soil layers cab be effectively drilled. The paper also discusses the improvement of the existing drill bit so that the construction efficiency can be improved and the service life of the drill bit can be increased.  

Key words: Rotary Drill Rigs, Drill Bit Selection, Construction Equipment, Equipment Improvement