河流弯道处桥梁水毁原因与防治措施分析

Analysis on the Causes and Prevention Measures of Bridge Flood Damage at River Bends

陇南市国道212线尚德4号、尚德5号桥在“8·17特大暴洪泥石流灾害”期间被冲毁,造成道路中断及经济损失。结合桥址处地形、水文、河流等条件,通过对这两座桥梁冲毁原因及防治措施进行分析,并结合工程实际过程中采用的灾后恢复重建方案,提出弯道内跨河桥、顺河桥在设计、施工、养护等阶段中应从多方面增加桥梁、路基、河道等防护工程,包括主动防护、被动防护。

Shangde No.4 Bridge and Shangde No.5 Bridge on 212 national highway of Longnan City were destroyed during the“8.17 mega-torrential debris flow disaster”,resulting in road interruption and economic loss.Based on the landform,hydrology,river and other conditions at the bridge site,the causes of the two bridges being destroyed and the prevention measures are analyzed.In combination with the post-disaster recovery and reconstruction plan adopted in the actual process of the project,it is proposed that the bridge,sub-grade,river channel and other protection works,including active protection and passive protection should be added in the design,construction,maintenance and other stages of the river crossing bridge in the curve.