PURPOSE: To prevent splashing of a solidifying agent to eliminate ill effects on the surroundings by sprinkling an emulsified material or a suspended substance in which the solidifying agent is mixed with water on the surface layer of a weak ground, and mixing the surface of the ground with the emulsified material by a stabilizer, etc.

CONSTITUTION: A solidifying agent such as cement, lime, etc., is mixed with water to obtain an emulsified material or a suspended substance. The liquid- solidifying agent 1 is sprinkled on the surface layer of a weak ground by a sprinkler-car 3, and then subsoil and the solidifying agent are mixed by a stabilizer 2. In this way, the surface layer is solidified to improve bearing capacity of the ground. Splashing of the solidifying agent during sprinkling the solidifying agent can thus be prevented.