| 摘要 |
PURPOSE:To stabilize the ground to be improved by a method in which cement milk is injected with high speeds into the ground while turning a nozzle bit to form a disk-shaped structure and a splitting permeation phenomenon is caused in the upper and lower directions of the structure to form a radial structure integrally. CONSTITUTION:A nozzle bit 1 is penetrated to a given depth into the ground GL, and while turning the bit 1 cement milk is injected with high speeds through a jet nozzle 10 into the ground to form a disk-shaped structure 11. During the formation of the structure 11, a splitting permeation phenomenon is caused in the upper and lower directions of structure 11 by the pressure of the cement milk in the ground in such a way that the cement milk is partly injected in a split line form to form vertical walls 11A in the upper and lower directions of the structure 11. |
