Roadbed improvement method and improved roadbed

摘要

PROBLEM TO BE SOLVED: To provide a roadbed improvement method and an improved roadbed capable of easily improving a roadbed without removing a track or a roadbed. SOLUTION: The roadbed improvement method is a method of improving a roadbed 6 supporting a trackbed 5 with a filling material F1. The roadbed improvement method includes an injection hole forming step of forming an injection hole 5b into which the filling material F1 is injected into the trackbed 5, a filling material flowing down step of allowing the filling material F1 to flow naturally from the injection hole 5b, and a filling material F1. Includes a filling material permeation step of permeating the roadbed 6. The filling material infiltration step includes a step of infiltrating the filling material F1 of the ultrafine cement milk containing the hardening material into the roadbed 6. The improved roadbed 7 is a portion where the roadbed 6 supporting the trackbed 5 is improved by the filling material F1. The filling roadbed layer 7a is formed by infiltrating the filling material F1 into the roadbed 6 by natural flow from an injection hole 5b that is backfilled after the filling material F1 is injected. [Selection diagram] FIG. 7