| 摘要 |
PROBLEM TO BE SOLVED: To enable old soil to be effectively replaced by new soil without cutting or damaging roots of trees. SOLUTION: Soil is improved by transferring, under pressure, and injecting new soil T suitable for enhancing the vigor of trees into the ground comprising old soil S to be improved with a transfer means 1 comprising a pressure pump, etc., suitable for transferring, under pressure, a material having a high consistency such as concrete mortar, causing the old soil S to rise on the ground by the injection pressure of the new soil T, and removing the old soil S which has risen. |
