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1981年8月21日宝成铁路沿线普降大雨,嘉陵江出现前所罕见的特火洪水,致使淹没路基,冲毁路堤和河岸防护工程,冲毁桥梁,中断行车,损失巨大。在水害抢险修复设计中,对宏庆车站南端站外(K120+160～K120+740)及李家河车站(K123+656.64～K123+980两处冲刷特别严重的河岸地段,由于没有明挖做脚墙基础施工的条件,采用了沉井基础防护,以确保路基的安全稳固。(见照片1、2、3)
August 21, 1981 Baocheng heavy rains along the railway, Jialing River before the rare exception of fire floods, resulting in submerged submerged embankment, flood embankment and river bank protection project, destroyed the bridge, interrupted traffic, huge loss. In the design of water disaster rescue and restoration, there is no need to dig the foot wall of the Qinghai-Tibet station outside the southern end station (K120 + 160 ~ K120 + 740) and Lijiahe station (K123 + 656.64 ~ K123 + 980) Basic construction conditions, the use of caisson basic protection, to ensure the safety and stability of the roadbed (see photos 1, 2, 3)