FLUIDIZATION BACK FILLING METHOD FOR BURIED SUBSTANCE

摘要

PROBLEM TO BE SOLVED: To provide a fluidization back filling method for a buried substance to release a traffic in two hours after placing of a fluidized earth layer. SOLUTION: In a fluidization back filling method for a buried substance to back fill various buried substances 3 buried or built below a ground surface 6 by using fluidized earth, a fluidized earth layer 1 is placed in the fluidized earth layer 1 at the periphery of the buried substance 3. An earth layer 2 of 90% or more in a weight ratio consisting of particles with a grain size of 0.6 mm or more is formed as a lower layer base on the fluidized earth layer 1. After a solidifying liquid in which a solidifying material containing cement 0.25-1.5 to gypsum 1 in weight ratio and water 0.8-1.2 to the solidifying material 1 in weight ratio are mixed together is sprinkled, an upper subbase course 4 and a pavement 5 are placed on the earth layer 2.