| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of maintaining and repairing ballast and a track in a labor-saving manner by using a nozzle bit developed by the present inventor, the method intending not only to reinforce ground having a roadbed built thereon while maintaining the ballast and the track fixed to sleepers as they are, but also to reinforce the railway track by injecting cement milk into the ballast, and combining the ballast with the sleepers having the track fixed thereto, the injection of the cement milk into the ballast laid on the roadbed conventionally assumed tube difficult due to heavy pressure of the track applied to the ballast. SOLUTION: According to the method, conical disk structures are formed in the ground in multiple stages along the railway track on the railway roadbed which has been compacted, by using the nozzle bit which has a desired number of injection holes formed therein. Each injection hole tilts at a downward angleθ1 with respect to an insertion direction into the ground and a lead angleθ2 in a lead angle direction with respect to a rotating direction. Then the nozzle bit is operated in the ballast laid on the roadbed similarly to the operation of forming the conical disk structures, and the permeable cement milk is force-fitted in gaps in the ballast, whereby the ballast and the sleepers having the rail firmly laid thereon are hardened in one body to obtain a foundation floor. In this manner, the foundation floor is successively extended in a railway track direction. COPYRIGHT: (C)2004,JPO
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