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当城桥是天津地区仅存的两座桁架拱桥之一,建于上世纪70年代,在交能量和荷载大幅度增加的情况下,发生了严重的损坏。文章通过该桥进行的几次鉴定的,对桥梁的损坏情况进行了充分的描述,并对原因进行了分析。在对结构进行模拟计算的基础上,提出了相应的维修加固方案,即对上部结构采用截面增加法解决杆件承载力不够的问题,下部结构采用旋喷桩加固法解决基础较柔的问题,并在各拱片之间增加了横向联系。文章对维修的具体方法进行了叙述,并介绍了加固的顺序。
When Chengqiao was one of the two remaining truss arch bridges in Tianjin, it was built in the 1970s and suffered serious damage in the event of a substantial increase in energy and load. The article made several appraisal through the bridge, fully described the damage of the bridge, and analyzed the reasons. Based on the simulation calculation of the structure, a corresponding repair and reinforcement scheme is put forward, that is, the problem of inadequate bearing capacity of the bar by using the section increase method for the superstructure is solved. The lower part of the structure is treated by the rotary jet grouting pile reinforcement method to solve the problem of soft foundation. And in the arch between the increased horizontal contact. The article describes the specific methods of repair and describes the order of reinforcement.