大口径钢管静压桩托换加固技术应用探讨

Discussion on Application of Underpinning Reinforcement Technology for Large Diameter Steel Pipe Static Pressure Pile

结合西部某工业厂房地基托换实际工程,阐述了坑式钢管静压桩优越的工程性能,可以有效解决既有建筑物因基础沉降产生的病害问题;提出大口径坑式钢管静压桩托换加固地基的处理方案、适应范围、设计原则、主要参数及其选取,并分析其施工工艺、施工控制的要点及质量控制措施。根据监测数据和使用情况,评价加固效果,表明大口径钢管静压桩加固效果可靠,值得推广应用。

Combined with the actual foundation replacement project of an industrial plant in western China,this paper expounded that pit-jacked steel pipe static pressure pile in virtue of its superior engineering performance can effectively solve the diseases caused by foundation settlement of existing building.It proposed the treatment scheme of underpinning reinforcement of foundation by large diameter pit-jacked steel pipe static pressure pile,together with the scope of application,the principles of design,the main parameters and their selection;and then analyzed the construction technology,the key points of construction to be controlled and the quality control measures.According to the supervision data and the service condition,the reinforcement effect was evaluated.It shows that large diameter steel pipe static pressure pile contributes to reliable reinforcement effect,and is worth wide use.