下穿高速公路路基顶进框架桥施工监测技术研究与应用

Research and Application of Construction Monitoring Technology for Jacking Frame Bridge under Expressway Subgrade

顶进法是既有线条件下修建平改立或新增立交通道的通常采用的方案,其主要的特点是在保证运输安全、行车不中断或限速通过施工地段、基本不修筑便线进行过渡施工、临时占地比较少,将提前整体预制好的结构物一次或分段顶进,施工工艺可靠、安全性较高。通过框架桥结构顶进过程中实时监测与控制,以掌握顶进施工全过程中桥梁结构各关键部位的安全状态和发展动态,严守结构的安全性底线,预防各种可能损伤施工区域结构的事件,保障高速路面的行车安全,为施工过程提供数据指导,因此监测工作尤其重要。

Jacking method is a commonly used method to build new or upgraded traffic lanes on existing lines. Its main characteristics are to ensure the safety of transportation, uninterrupted driving or speed limit through the construction site, basic nonconstruction of temporary lines for transitional construction, less temporary occupation of land, the whole pre-fabricated structure will be pushed forward in one time or in segments, the construction technology is reliable and safe. Through real-time monitoring and control in the jacking process of frame bridge structure, the safety status and development trends of key parts of bridge structure in the whole process of jacking construction are grasped, the safety bottom line of structure is strictly observed, various events that may damage the structure of construction area are prevented, and the traffic safety of high-speed pavement is guaranteed, so as to provide for the construction process. Data guidance, therefore monitoring is particularly important.