福州江滨地区超高层建筑灌注桩成孔工艺分析

Borehole Completion Process of Cast-in-place Pile for Super High-rise Buildings in Fuzhou Riverside Area

以福州江滨地区2个有代表性的超高层建筑桩基础工程实例为依据,通过无卡式冲击+正循环,旋挖+气举反循环,回转+泵吸反循环3种成孔工艺之间的比对,提出了在福州市江滨地区超大粒径厚层卵石与花岗岩地层灌注桩施工成孔工艺方面的一些见解,认为回转+泵吸反循环是较为可靠的工艺。

Taking 2 representative prohect examples of super high-rise buildings in Fuzhou riverside area as the basis, by the process comparison of conventional percussion drilling ＋ normal circulation drilling, rotary drilling ＋ air lift reverse circulation drilling and rotary drilling ＋ pump suction reverse circulation drilling, some opinions are presented for the grou- ting pile drilling construction in thick layer of super large-size gravel and granite formation in Fuzhou riverside area, rotary drilling ＋ pump suction reverse circulation process is decided to be reliable.