| 摘要 |
PURPOSE:To improve a soft ground, by a method wherein a cylindrical nozzle, having injection ports provided in its tip and extended in two directions of one above and the other below is inserted into a ground as it is rotated, and a soil solidifying material is poured into soil at intervals of a given distance. CONSTITUTION:With a motor 8 driven, a cylindrical nozzle 3 is rotated, and cement mortar is fed to the nozzle 3 with the aid of a high pressure pump, the mortar being injected into a ground through a first injection port 6 and a second injection port 7. This causes conical bowl-shaped parts 10 and 11, turned above and below, to form in a ground, resulting in the possibility to strengthen a soft ground. |
