土岩地基中钻孔灌注桩设备选型与成孔工艺

EQUIPMENT SELECTION AND PORE FORMING TECHNOLOGY OF BORED PILE IN SOIL AND ROCK FOUNDATION

刚果共和国布拉柴维尔商务中心位于平面上软土与硬岩交叉分布,竖向碎散细粒土与胶结岩体交替互层的非均匀分布复杂地基上,结构基桩穿越其间,而现场设备能力受限。采用改进反循环成孔工艺,可满足土岩互层地基中桩基成孔进度与质量要求,即基桩成孔设备选用大功率反循环钻机,穿过一般土层时采用加强型钻头,穿过硬质岩体时采用牙轮钻头。

The Republic of Congo, Brazzaville Business Center is located in the plane of soft soil and hard rock cross distribution of vertical pieces of fine grained soil and cemented rock alternating layer of non-uniform distribution of complex structure pile foundation, through which, and the equipment capacity is limited. The improvement of reverse circulation drilling technology can meet the requirements of the pile foundation and the quality of the pile foundation. That is the drilling device with large power reverse circulation drill, through general soil with enhanced drill through hard rock with rock bit.