| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 96 === Abstract
High speed rail is a trend of ground transportation systems in many modern countries. In Taiwan, the railway performance has be greatly by electrification and rail structure strengthening. The speeds of trains have been raised from 60~80 km/hr to 120~130 km/hr since running steamer to diesel electric locomotive. The rail underwent electrification and changed the 25m standard length rail from wood cross tie track to 50N continuous welded rail (CWR) of prestressed concrete (PC) cross tie track in order to accelerate the speed of train improving Taiwan railway function.
Railway long-railed on development and study has breakthrough good result in technology of design, welding, construction and maintain. It can be demonstrated and agreed make use of expanding range of laying welded rail in track. The track buckling caused by railway long-railed can overcome by replacing the ballast track of high-intensity slab track. Considering the track construction is difficult between the train running, and construction economic benefits, the traditional ballast track should be the value and necessity. The Taiwan Railway used the slab track of the more vulnerable and conservation on the difficulties track conditions such as bridges, tunnels and elevated part. In the other track, it still used traditional line of ballast at the track more than 90 percent. So that rail safety management operation is playing an important rule on preventing to buckle.
There is setting up perfect theory of design and laying CWR, but there are many unsure factors of maintenance caused safety blind spot in fact. For example, the rail was caused plasticity to be out of shape or stress concentrating after wheel rolling and rail creepage during a long time .It will force the installation temperature decreasing and extra reduce value of rail allow increase temperature. The installation temperature decreasing is bad of track stabilizing, especially in high temperature on summer. The track will buckle easily because the rail temperature rises too much to exceed value of rail allow increase temperature. Reducing extra reduce value of rail allow increase temperature can not to be discovered in normal Maintenance. Therefore, this study gets accumulative stress value of laying rail in worksite through rail axis stress detecting. It removes rail pressure to prevent buckling according to calculate reality decreasing value of rail installation temperature.
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