设计箱涵时，由于对地基情况了解不够全面，导致建成运行后不均匀沉陷过长，加之单节箱涵长度过大且纵向钢筋配筋量偏小，往往引起箱涵中部断裂。箱涵断裂后，一方面渗径变短，影响安全而不能正常使用；另一方面，如不及时处理，沉陷继续加大，直至整座箱涵报废。对箱涵断裂， When design box culvert, because of insufficient understanding of the foundation conditions, resulting in uneven settlement after the completion of the operation, combined with a single box culvert length is too large and longitudinal reinforced tendon is too small, tend to cause the middle of the culvert fault. Box culvert rupture, on the one hand, shorter diameter osmosis, affecting the safety and can not be used normally; the other hand, if not handled in time, the subsidence continues to increase until the entire box culvert scrapped. Box culvert fracture,