桩底后压浆技术在桥梁改扩建工程中的应用研究

Study on Application of Pile Bottom Post Pressure Grouting Technology in Bridge Reconstruction Extension Project

为了减小新旧桥梁桩基基础沉降差异对桥梁造成的影响,采用桩底后压浆技术对新建桥梁钻孔灌注桩进行处理,通过对加固后的钻孔灌注桩周围的土体进行取样可知,桩底后压浆技术可以有效提高钻孔灌注桩周围土体的摩阻力,提高桩的承载力,减小新旧桥梁基础沉降差,有关经验可供相关专业人员参考。

In order to decrease the influence of the pile foundation settlement difference on old and new bridges, the pile bottom post pressure grouting technology is used to treat the cast-in-situ pile of the newly built bridge. According to the sample of soil surrounding the reinforced cast-in-situ pile, it is shown that this technology can efficiently improve the frictional resistance of soil surrounding the cast-in-situ pile,improve the bearing capacity of pile and decrease the foundation settlement difference of old and new bridges. The relative experience can be referred for the similar projects.