在轨道上每根钢轨的轨缝尺寸,主要由轨温差、构造轨缝、接头阻力和钢轨基础阻力这几个基本条件所决定。对12.5米钢轨,可不考虑接头阻力和钢轨基础阻力的影响,按钢轨自由伸缩,由轨温差和构造轨缝来决定。但对25米钢轨,则必须考虑接头阻力和钢轨基础阻力与轨缝标准的关系。本文试就这方面的问题进行探讨。 The orbital seam size of each rail is mainly determined by the basic conditions of rail temperature difference, structural rail joints, joint resistance and rail foundation resistance. On the 12.5-meter rail, regardless of the resistance of the joint and the resistance of the rail foundation, the free expansion and contraction of the rail is determined by the difference of the rail temperature and the structural rail. However, for a 25-meter rail, the relationship between joint resistance and rail-based resistance must be considered. This article examines the issues in this area.