偏斜预应力混凝土管桩承载能力分析及合理利用研究

Study on Bearing Capacity and Rational Utilization of Skew-prestressed Concrete Pipe Pile

预应力混凝土管桩具有桩体强度高、施工速度快等优点,在工程建设中得到广泛应用。但是在施工过程中,易受周围环境、施工顺序等影响,出现桩身移位、偏斜等质量问题,使管桩的承载能力降低,影响建筑结构的安全。该文结合工程实例,对预应力混凝土管桩偏斜发展的不同阶段,分别建立力学模型,并根据偏斜所处阶段的力学模型,计算偏斜桩所受轴向压力、弯矩和剪力,得出偏斜桩主要受其抗弯和抗剪性能影响的结论。该文的研究为偏斜桩的合理利用提供了可量化的理论依据,可为基础加固方案的制定提供参考。

Prestressed concrete pipe piles have found the widespread use in construction due to advantages of high pile strength and fast construction speed.However,in the process of construction,they're easily affected by factors like the surrounding environment and construction sequence,causing quality problems such as displacement and deflection of the pile body,which reduces the bearing capacity of the pipe pile and affects the safety of the building structure.Combined with engineering cases,this paper established mechanical models for the different stages of the deflection development of prestressed concrete pipe piles,and calculated the axial pressure,bending moment and shear force of the deflection pile based on the mechanical model of the deflection stage,thereby drawing the conclusion that the deflection pile is mainly affected by its flexural and shear performance.The research in this paper provides a quantifiable theoretical basis for the rational utilization of skewed piles,and for the formulation of foundation reinforcement schemes as well.