高架桥施工期附近既有桥梁的安全性监控

在高架桥施工过程中,为保证作为高架桥施工支架基础或部分基础的既有桥梁的安全性和使用性能,必须采用一定的监测技术对既有桥梁进行监控。介绍了既有桥梁安全性监测系统设计的基本原则与内容,以及监测报警指标拟订的基本方法。针对一个实际工程,进行了监测目的的确定、测点的优化布置、监测仪器的选择、数据采集时机和频率的选择,以及报警指标的拟订,给出了实际监测的基本过程与结果。通过监测,说明对既有桥梁进行监控是保证既有桥梁安全性和使用性能的有效手段。

Safety monitor ing of existing bridge during construction of new trestle

During the construction of a new trestle,to guarantee safety and the performance of the existing bridge used as the foundation or partial foundation of the construction scaffold,it is necessary to adopt a monitoring technique to monitor and control the existing bridge.The basic principle and the content of designing a safety monitoring system were introduced,and the basic method of drawing alarming indexes put forward.According to a practical project,the monitoring objective was fixed,the measurement points optimally laid,the monitoring equipments as well as,the occasions and frequency of collecting data chosen,and the alarming indexes drawn.Then,the cause and result of the monitoring were presented.Through the monitoring example,to monitor and control the existing bridge was proved to be an effective means of guaranteeing its safety and performance when constructing the new trestle.