大量的桥梁在远没有达到预期使用寿命时,出现了影响正常使用的病害与劣化;特别是一些桥梁在只使用了几年、甚至刚建成不久就出现严重的耐久性不足的问题,这与施工质量低下有重要关系,典型的问题有钢筋保护层不足及目前广泛存在于施工现场的严重的构件开裂问题。这些施工上的缺陷虽然短期不会对桥梁的正常使用产生明显的影响,但却会对结构的长期耐久性产生非常不利的影响。 A large number of bridges, far from the expected service life, have suffered from diseases and deterioration that affect their normal use. In particular, some bridges have been used for only a few years and serious shortcomings even shortly after they were completed are contradicted by construction Low quality has an important relationship, the typical problems are inadequate protective layer of steel and the current widespread in the construction site of serious cracking problems. These shortcomings in construction will not have a significant effect on the normal use of the bridge in the short term but will have a very adverse effect on the long-term durability of the structure.