Ground improvement method , drill rod and soil improvement apparatus for use in ground improvement method .

摘要

Disclosed is injected binder into the soil at the construction site, by mixing and stirring the soil with the binder is solidified in a columnar shape, and to build a pile structure at ground improvement method for firmly improve soil, stiffeners even without using and provide ground improvement method that is adapted predetermined strength regardless of the pile structure on soil of the ground is obtained. A process ground to be drilled to the required depth by the drilling head 33 to form a borehole 40 inside the excavated soil is left, the step of injecting a binding material from inside the nozzle 32 of the borehole 40, borehole 40 and were mixed by stirring of the interior of the excavated soil binder by stirring member, the step of creating a mixture 5 of unsolidified in the interior of the borehole, in the interior of the mixture 5 of unset, and increasing the nozzle 32 from the inner bottom portion of the borehole 40 while, by injecting a binding material in the center of the mixture 5 of unset, the step of forming the core portion 6 unsolidified made with a binding material in the center of the mixture 5 of unset, only the inside of the borehole 40 is a ground improvement method comprising the step of solidifying the core portion 6 unsolidified a mixture 5 of solidification. BACKGROUND 2.