陕西柞水高速垮桥《灾害调查评估报告》公布。
洪水冲击使10号桥墩桩基折断倾倒、桥梁垮塌。20:49至21:03间25辆车坠河，62人死亡失踪。
测算垮桥原因：流水压力占35%。树木等漂流物在桥墩处形成12.8m × 3m的“挡水墙”，其推力占57%。另外，桥梁未按图施工，系梁本应埋在河床下3m，实际埋在河床表面，洪水冲刷河床降低系梁悬空，加剧漂流物壅塞，此因素占比8%。
高速与省道路基形成局部汇流区；桥墩初步设计是“斜交斜做”，施工图阶段改为“斜交正做”，增大了阻水比。
工程未向水利部门申请涉河建设项目许可。地方水利部门未有效治理非法采砂。
事发桥梁在两个摄像头背向之间，不在监控区域。
（应急管理部，陕西省纪委）
BY 竹新社
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