钻孔灌注桩桩端后注浆技术在建筑桩基工程中的应用

Application of bored piles pile post grouting technology in architecture project

钻孔灌注桩常作为高层建筑基础,但钻孔灌注桩的施工质量很难控制,尤其是当桩长时,常会造成工程事故和经济上损失,本文通过工程实例介绍钻孔灌注桩后注浆工艺及效果,分析后注浆技术提高桩侧摩阻力和桩端阻力的机理,试验表明桩端后注浆技术可作为提高钻孔灌注桩承载力的有效措施。实践证明钻孔灌注桩后注浆工艺技术可靠,速度快,造价低前景良好。

drilled cast--in situ piles are more and more used in foundation of high --rise buildings, drilled cast--in situ piles quality of its construction is very difficult to eontrod , especialy for long piles whieh will cause accidents frequently and economically huge loses, This paper illustrates process and effects Of base pressure-grouting and pressure--grouting along pile of engineering practical. The mechanism of improving the end bearing re- sistance and frictional--resistance of drilled cast--in situ pile by the post--grouting is analyzed. The results of the test show that the toe pressure post--grouting may be used as a useful measure for raising the bearing capacity of the bored pile, ti is proved drilled cast--in--situ piles pressure-- grouting is reliable in technique, quick in construction, low in construction cost, this technique will have a wide landscape of development in the fu-