本文针对混凝土岔枕预埋塑料套管内螺纹失效问题提出采用换芯法进行整治,即在既有塑料套管不动的前提下,对其进行钻孔和攻丝,然后拧入同等材质制造的芯管,使塑料套管内失效螺纹得到更换。试验证明,该换芯法对失效螺纹的整治具有效率高、强度满足要求的显著特点。 In this paper, concrete sleeper embedded plastic casing for internal thread failure problem proposed by the core method for remediation, that is, the existing plastic casing does not move under the premise of their drilling and tapping, and then screwed into the same material manufacturing Core tube, the failure of the plastic casing thread to be replaced. The test proves that the core-changing method has the remarkable characteristics of high efficiency and strength to meet the requirements for the treatment of failure threads.