软土地区既有铁路路基雨棚灌注桩施工技术

Construction technology of bored pile in existing railway subgrade canopy in soft soil region

通过温州火车站雨棚钻孔灌注桩的施工实践,详细阐述了在铁路路基施工完毕的情况下,采用大开挖网喷护壁加混凝土护筒进行钻孔灌注桩施工方法,基坑回填采用5%水泥级配碎石回填,既达到了保护路基不受泥浆渗入的作用,又充分满足了路基承载力要求,有效地解决了既有铁路路基上成桩困难的问题。

Based on the construction practice of bored pile in Wenzhou railway station canopy,the paper specifically describes the condition after railway subgrade construction completion,applies large excavation mesh and anchoring wall protection,used bored pile construction method,and uses 5% of cement gradation gravel to backfill the foundation.As a result,it not only prevents the slurry leakage but also meets the subgrade bearing requirement and effectively solves the existing railway subgrade piling difficult problem.