Roadbed construction method and roadbed structure

摘要

PROBLEM TO BE SOLVED: To provide a roadbed construction method and a roadbed structure capable of maintaining excellent water permeability and water retention for a long period of time and forming a roadbed having good maintainability. A step of forming an underdrain drainage layer 11 on a roadbed G, a step of forming a lower layer 12 on the underdrain drainage layer 11, and a step of forming an upper layer 13 on the lower layer 12 are provided. , The step of forming the lower layer 12 includes a step of casting a mixture formed by mixing and stirring decomposed granite soil, a cement-based solidifying material, an agglomerating agent and water on the underdrain drainage layer 11 to solidify it. In the step of forming the upper layer 13, a mixture formed by mixing and stirring decomposed granite soil, a cement-based solidifying material, an agglomerating agent, and water in a smaller amount than when forming the lower layer 12 is put on the lower layer 12. It is a roadbed construction method including a process of placing and solidifying in a granite. [Selection diagram] Fig. 1