旧桥既有桩基础再利用可行性试验研究

Experimental Study on the Feasibility of Reusing the Existing Pile Foundation of the Old Bridge Reconstruction

目前许多研究均表明桩基础随时间增长其承载力会有一定的增加,这为既有桩基础在新工程中的再利用提供了理论支持,但是目前对既有桩基础再利用的相关研究很少。对此,结合广州南沙港铁路鸡鸦水道既有公路桥改扩建公铁两用桥项目,通过工程试验对既有桩基础与新建桩基础承载能力进行分析。结果表明,既有桩基础与新建桩基础在竖向荷载作用下应变趋势相同,即既有桩基础与新建桩基础共同承载。研究结果可以为本工程的施工提供指导,同时也为其他实际工程施工提供参考。

At present,many researches show that the bearing capacity of pile foundation increases with time,which provides a foundation for the reuse of existing pile foundation in new projects,but there are few researches on the reuse of existing pile foundation.The bearing capacity of the existing pile foundation and the new pile foundation is studied through the engineering test on the reconstruction and expansion of the existing highway bridge in Jiya waterway of Nansha Port Railway in Guangzhou.The results show that the strain trend of the existing pile foundation and the new pile foundation is the same under the vertical load,that is,the existing pile foundation and the new pile foundation bear the load together.The research results provide construction guidance for the construction of this project,and also provide reference for other practical engineering construction.