Abstract: A method for constructing a soil structure comprising a step of disposing reinforcements into a ground to thereby unify the soil structure by the friction force caused between the reinforcements and soil particles, said reinforcements being principally of rigid structure which possess a property of flexibility at the time of at least the disposition of said reinforcements to accommodate the same to any displacements of soil, the friction force being caused between said rigid structures and said soil particles, to thereby unify the soil structure.

Abstract: In a method of consolidating soils by injecting a hardner thereinto, a mixture of an aqueous solution of water glass and acidic reactant is employed as the hardener, the aqueous solution being prepared to be within the range of from weak acidity to weak alkalinity in pH value, to prevent the occurrence of pollution such as soil pollution or subterranean water polutions.

Abstract: A method of consolidating a poor quality soil or a water leaking soil by injecting hardeners thereinto, in which a mixture of water and gelling agent and a water glass aqueous solution containing gelling agent are employed as said hardeners, said hardeners are joined together and injected into said soil, whereby to modify the soil into a uniformly and strongly consolidated soil or water-tight soil.