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在2012年北京“7·21”特大暴雨灾害中,丰益桥、菜户营桥、莲花桥等多个桥区都成为积水最严重的路段,个别桥区经过十余个小时才恢复交通,给市民生活带来不便。汲取“7·21”特大暴雨灾害中的教训,北京市政府将下凹式立交桥区雨洪工程的建设作为头等大事。由于北京市区空间狭小、建筑密度大,特别是桥区附近已接近饱和,在一些桥区的改造过程中会对桥梁基础产生不利影响,如北京市二环路左安门桥明开槽管线工程采用微型钢管桩防护,通过ANSYS有限元软件分析验算调整微型钢管桩技术参数,保证桥梁的安全稳定。
In 2012 Beijing “7.21 ” heavy rainfall disaster, Feng Yi Bridge, Caihuoying Bridge, Lotus Bridge and other bridge areas have become the most serious sections of water, individual bridge area after more than ten hours before Restoring traffic brings inconvenience to citizens. Drawing lessons from the “July 21” torrential rain disaster, the Beijing municipal government has made the construction of under-flushing overpass project a top priority. Due to the small space and high density of buildings in Beijing, especially near the bridge area, the bridge foundation will be adversely affected during the reconstruction of some bridge districts. For example, The project adopts micro-steel pipe pile protection, analyzes and calculates the technical parameters of the mini-steel pipe pile through ANSYS finite element software to ensure the safety and stability of the bridge.