Importance

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Abstract

A multi-shaft drilling unit having three auger shafts for developing a continuous under ground wall and comprises a housing for retaining pitch between the auger shafts, the housing comprising, primary transfer gears rotating around a central auger shaft, secondary transfer gears engaging with the primary transfer gears, a tertiary transfer gear connected to the primary transfer gear, a quaternary transfer gear connected to the tertiary gear and fixed to a rotary shaft orthogonally crossing a straight line connecting auger shaft centers, and cone-shaped cutters expanding the diameter outward and fixed on both ends of the rotary shaft. The cutters cut off a triangular convex and form a continuous wall unit of which both ends form a semicircle and both sides form a straight line and can be formed in subsoil. Because the cutters are coned-shaped, such a truncated cone-shaped, most of the triangular convex are drilled and the remaining parts of the triangular convex are naturally collapsed by tare weight, vibration and the other events even if the pitch between auger shaft is lengthened.

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First Claim