本文根据对沈山线小跨度梁重点调查的情况，分别分析阐述了老龄钢筋混凝土梁和八十年代更换的钢筋混凝土梁病害形成的原因以及病害整治措施。可供其它类似桥梁养护维修借鉴。

This paper respectively analyses and describes the disease causes of old aged reinforced concrete girder and the girder replaced in 1980 , proposes the treatment measures for the disease based on the investigated situation of small-span bridge on shenyang-shanhaiguan railway line, for reference to maintenance of similar bridge.