坑底钢管静压桩地基托换加固技术应用

Reinforcement Technology Application of the Foundation Underpinning with the Steel Pipe Bottom Static Pressure Pile

坑底静压桩地基托换技术可以针对具有湿陷性的软弱土层,解决构筑物地基产生沉降变形的问题。结合坑底钢管静压桩地基托换加固技术原理和陕西某煤矿瓦斯泵房风机地基沉降变形及工程地质条件,提出了坑底钢管静压桩托换加固设计方案,介绍了坑底钢管静压桩成桩施工工艺、质量控制要点,对坑底静压桩的桩尖入土深度和压桩力进行了分析。结果表明,坑底钢管静压桩对软弱湿陷性地基加固效果良好,成桩质量控制要重视施工的过程控制,可以很好地解决软弱湿陷性土层产生的地基沉降开裂问题。

Static pressure pile foundation underpinning technology can solve the problem of structure foundation subsidence deformation in bottom collapsibility with soft soil layer. Combining with steel pipe bottom static pressure pile foundation underpinning reinforcement technology principle and shaanxi subgrade settlement deformation of the coal mine gas pump room fan and engineering geological conditions, the bottom steel pipe pile underpinning reinforcement design scheme is put forward. This paper introduces the construction technology for steel pipe pile static pressure pile bottom, and key points of quality control. Capacity of static pressure pile bottom of pile tip and the force that press a pile are analyzed. The results show that the steel pipe pile bottom collapsibility of soft foundation reinforcement effect is good, the quality control of pile should attach great importance to the process of construction control, which can solve the weak soil foundation settlement crack problem well.