我们曾在铁路桥梁建筑中的123片后张法钢筋混凝土梁进行裂缝观察,发现其中21片梁出现裂缝,绝大部分裂缝的宽度为0.1～0.15毫米,小部分为0.15～0.2毫米,或小于0.1毫米,也有个别裂缝宽达0.6毫米的。裂缝深度为2.7～8.9毫米,长度为0.6～35.76米不等。为了避免裂缝扩展及钢筋锈蚀,影响梁体的承载能力,我们采用环氧树脂胶液粘结与压注灌浆的修补方法来进行处理,效果良好,经使用表明是切实可行 We observed cracks in 123 post-tensioned reinforced concrete beams in railway bridge buildings and found that 21 of them had cracks. The majority of cracks had a width of 0.1 to 0.15 mm and a small portion of 0.15 to 0.2 mm, or less. 0.1 mm, there are individual cracks up to 0.6 mm wide. Crack depths range from 2.7 to 8.9 mm and lengths from 0.6 to 35.76 meters. In order to avoid crack propagation and steel corrosion and affect the bearing capacity of the beam body, we used epoxy resin glue bonding and pressure injection grouting repair methods to deal with the effect is good, it is practical to use