PROBLEM TO BE SOLVED: To simplify a process for enhancing a derailment prevention guard in a guard section of a rail track with a derailment prevention guard installed.;SOLUTION: Temporary sleepers 20 are installed while main line rails 10 are fixed by existing PC sleepers 18 without exchanging all the existing PC sleepers 18 in a guard section of a rail track with the temporary sleepers 20. Then, a guard rail 34 having a higher strength than a guard angle is fixed by using the temporary sleepers 20. Therefore, only assembly and removal of the temporary sleepers 20 and the guard rail 34 and restoration work of the guard angles occur before and after a construction period, and a process for enhancing a derailment prevention guard is simplified.;COPYRIGHT: (C)2014,JPO&INPIT
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