PURPOSE: To permit the injection of cement milk even into cohesive soil and humus soil layer by a method in which a cement milk mixture to which is added a soilim proving agent is injected into the soil from an inclined nozzle in such a way as to form multi-layered conical disc layers in the soil.
CONSTITUTION: When the ground for single-track railroad is strengthened, spindles 5 and 5' are slantly fixed at the same angles until 40W45° with respect to the vertical line. Motors M2 and M2' for vertical moving purpose are operated by motors M1 and M1', and the spindles 5 and 5' are slowly lowered for excavating the ground. A cement milk mixture added with about 1% (based on the amount of cement) a water-soluble inorganic soil improving agent is jetted under a high pressure into the ground to form conical disc layers 12. Continuously strong improved ground having uniform strength can thus be formed.
MOTOAMI HAJIME
SAKURATANI MASAYUKI
KAMIYA MAKIO
MORISAWA MASAOMI
JPS4884410A | 1973-11-09 |