基于钻孔灌注桩后压浆技术的桥梁优化建设研究

Research on Optimal Construction of Bridge Based on Post-Grouting Technology of Bored Pile

针对传统钻孔灌注桩技术在承载力和施工效率方面的不足,研究根据桥梁钻孔灌注桩的后压浆技术理论,制定了适用于桥梁建设的操作规范和质量检验标准。通过数值模拟与实地检测相结合的方法,对比分析了未压浆桩和后压浆桩在不同条件下的竖向位移。研究结果显示,25 m未压浆桩、36 m未压浆桩和25 m后压浆桩的竖向位移最大值分别为23.28 mm、15.02 mm和9.65 mm。由此可见,后压浆技术显著提高了桩底承载力和桩端侧土的阻力,并且有助于提高桥梁工程的施工质量和效率。

Aiming at the shortcomings of traditional bored pile technology in bearing capacity and construction efficiency,based on the post-grouting technology theory of bored pile for bridge construction,the operation specification and quality inspection standard for bridge construction are formulated.The vertical displacements of unpressed pile and post-pressed pile under different conditions are compared and analyzed by numerical simulation and field test.The results show that the maximum vertical displacements of 25 m unpressed pile,36 m unpressed pile and 25 m post-pressed pile are 23.28 mm,15.02 mm and 9.65 mm,respectively.It can be seen that the post-grouting technology significantly improves the bearing capacity of pile bottom and the resistance of soil on the side of pile end,and helps to improve the construction quality and efficiency of bridge engineering.