摘要
灌注桩成孔施工目前比较常规的工艺有正循环泥浆护壁成孔、反循环泥浆护壁成孔、冲击成孔以及旋挖钻机成孔。选择何种成孔方法应综合考虑地质条件、环境条件、工期和成本等因素。以无锡某地铁车站立柱灌注桩施工工程为例,分析了正循环钻孔、反循环钻孔和旋挖成孔各自的可行性、成孔质量、成孔效率、施工成本和存在的问题,指出上部黏土层采用反循环成孔+下部碎石土层采用旋挖成孔工艺最适合本工程施工。
Currently,the drilling and installation of the bored and cast-in-place reinforced concrete piles include positive circulation with slurry,reverse circulation with slurry,impact boring and all-flight auger boring methods.The selection of an appropriate drilling method should comprehensively consider factors such as,subsurface conditions,environmental considerations,construction schedule and cost.The feasibility of positive circulation,reverse circulation and all flight auger boring methods,quality of borehole,and efficient of borehole installation and cost are comparatively evaluated.It is concluded that the reverse circulation method for upper cohesive soils and all flight auger boring method for the lower gravelly soils are the most cost effective combination approach.
作者
黄振波
HUANG Zhenbo(Shanghai Changkai Geotechnical Engineering Co.Ltd.,Suzhou 215028)
出处
《土工基础》
2019年第5期533-535,共3页
Soil Engineering and Foundation
关键词
灌注桩
正循环成孔
反循环成孔
旋挖成孔
组合成孔
Bored Piles
Positive Circulations
Reverse Circulations
All Flight Auger Boring
Combined Boring Methods
