| 摘要 |
PROBLEM TO BE SOLVED: To provide a removal method of an underground structure which can reduce vibration and noise.SOLUTION: A removal method of an underground structure comprises a solidified layer cut process, a screw-cut process, and a withdrawal process. In the solidified layer cut process, a blade 70 cuts a cemented layer 112. The blade 70 is attached to one end of a casing 12. In the screw-cut process, the casing 12 screw-cuts a lower end of an existing column 100. In the withdrawal process, a crane 14 withdraws a steel frame 110 from the underground. In the removal method of the underground structure, the blade 70 cuts the cemented layer 112. A shape of the casing 12 attached with the blade 70 is cylindrical. By this constitution, the steel frame 110 at a center portion of the existing column 100 is not cut, and the cemented layer 112 at its external periphery is cut. Since the steel frame 110 is not cut, a cause of noise and vibration is eliminated. As a result, there can be provided the removal method of the underground structure which can reduce vibration and noise. |
