Dig to change screw drill
We can be divided into three kinds of double head single screw, double head single screw and double head double screw according to the stratum and the power head of auger.
Drill hole diameter up to ф 400-1200mm. Auger bit classification:
1, soil layer auger drill commonly used drilling tools for shovel wear-resistant aluminum alloy track plate and cutting teeth, suitable for groundwater above the soil layer, gravel soil layer, containing a little clay density weathering layer and sand and stone layer particle size is not large without circulation system drilling. Structure is straight spiral, bullet single screw, double head single screw, double head double screw three. Because the single-screw bit is easy to remove slag and has small rotary friction resistance, it is suitable for drilling into the egg sand layer and good cohesive clay layer. Twin-screw bit has strong ability to carry soil and good guiding characteristics, which is suitable for drilling into loose strata and hard and soft interbedded strata. Bit specification is ф 400-2000mm.
2, rock auger drill commonly used drilling tools for the tip insert welding tungsten cobalt carbide imported from the United States of the pick. It is suitable for drilling into fine sandstone, well-bonded osandstone stratum and permafrost layer without circulation system in all kinds of engineering drawings. The structure can be straight screw and conical screw. According to the characteristics of formation and drill bit, there are various tooth pitch (rise Angle) of double head single screw, double head single screw, double head double screw. Bit specification is ф 400-2000mm.
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