岩溶地区钻孔灌注桩桩底缺陷处理

文章阐述了肇庆大桥南主桥桥墩大直径嵌岩钻孔灌注桩施工中，用钻取补强孔、清除桩底沉渣、压力灌注水泥浆的方法对桩底砼胶结不良，沉渣超标的两根基础桩进行补强，取得了较好的效果。

Treatment of Defects inthe Bottom of Bored Cast-in-Situ Piles in Karst Area

During the construction of large diameter bored cast-in-situ Concrete piles embedded into rock bed for the abutments of the northern main bridge of Zhaoqing Bridge,two foundation piles with poor cementation of concrete in the bottom and over-sediment of scum were remedied and strengthened by drilling reinforcing holes,removing scum from the bottom and pressure grouting of cement grout.Thus,the problem piles were satisfactorily strengthened with good results.