地面直敷管道热胀强度问题在油田集输管道中普遍存在，它对工程的质量、投资及材料消耗等方面都有相当大的影响。本文采用弹性抗弯铰力学模型代替弯头，用解析方法求得地面直敷管道的热胀位移和热胀内力。并对具体算例做了分析，得出了相应的结论。 The problem of the thermal expansion strength of the surface straight pipe is common in the oil and gas pipelines, which has a considerable impact on the project quality, investment and material consumption. In this paper, flexible bending hinge mechanics model instead of elbow, analytic method was used to calculate the direct thermal expansion of the ground pipe displacement and thermal expansion of internal forces. Analyzed the concrete example and got the corresponding conclusion.