| 摘要 |
A cutting tool for enlarging a hole in clay, soil, rock or like material comprising an outer tubular member being provided with at least two pairs of diametrically opposed, axially elongated apertures, an inner bar member slidably housed within the outer tubular member, and a cutter blade lying within each of the elongated apertures in the bar member, is suitable for forming an undercut hole in the method of anchoring described hereinafter with reference to Fig. A.
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