娄江特大桥深孔泵吸反循环工艺的改进

Improvement on Deep Hole Pump-suction Reverse Circulation Technology in Super Large Bridge

摘要:

随着国家基础设施投入的加大，桩径1000～2000 mm、孔深100～130 m的钻孔灌注桩在各类工程中屡被采用。泵吸反循环传统上被用于孔深不超过80 m的深孔，在京沪高铁第六标段娄江特大桥钻孔灌注桩施工中，通过对现有的反循环钻机进行改进，很大程度上提高了泵吸反循环的工作效率，顺利地完成了孔深131 m、桩径18 m桩孔的施工，产生了很好的经济效益。

关键词:泵吸反循环;大直径;超深孔;灌注桩;钻机改进

Abstract:

The bored-grouting pile with diameter of 1000～2000 mm and depth of 100～130 m are often used in various projects. Pump-suction reverse circulation was traditionally used in the hole not more than 80 m deep, but by the improvement on the existing reverse circulation drill, the efficiency of pump-suction reverse circulation was greatly improved with pile hole of 18 m in diameter and 131 m in depth finished.

Key words:pump-suction reverse circulation; large diameter; ultra-deep hole; grouting pile; drilling rig improvement