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Unevenness analysis in the long-rail of CWR during stress releasing controlled with length

ZHOU Xiao-lin, CHEN Xiu-fang, XIANG Yan-nian (School of Civil Engineering and Architecture, Central South University, Changsha 410075,China)  
In order to study the unevenness in the long rail of continuous welded rail(CWR) and direct the correct work during stress-releasing on CWR, in this paper, accorded to the basic principles and combined with the technology of stress -releasing controlled with length in the worksite, the theoretical analyses about the uneven distribution of temperature-force and rail-fastenning temperature and displacement, produced in long rail due to stretching with rail stretcher, are dealed with. The results show that the distribution of temperature-force and rail-fastenning temperature and displacement in long rail are uneven after the long rail stretched with rail stretcher is locked. The uneven brings hidden danger on safty into the strength and the stability and the maintain on CWR. So the stress-releasing on CWR must be adjusted about evenness after the stretchy amount meets to the demand of releasing amount in order to meet to the even demand of stress-releasing on CWR.
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