摘   要：通过对管桩产品两端起吊和两点起吊时的受力状态进行分析，分别推导出了管桩产品两端起吊和两点起吊时的最大弯矩和长度的关系式。并以管桩开裂弯矩检验值作为安全起吊的最大弯矩控制条件，动力系数取1.5倍，分别计算出了管桩产品两端起吊和两点起吊时安全起吊的最大长度，为管桩安全生产保证管桩产品质量提供了理论依据。

Abstract：By force analysis for hoisting PHC pile at the two ends and at the two fixed points, the relational expressions of the maximum bending moment and the length of pile are put forward separately when the pile is hoisted at the two ends and at the two fixed points. The maximum lengths of pile safe hoisting are calculated separately for hoisting PHC pile at the two ends and at the two fixed points according that the maximum bending moment of safe hoisting pile should be less or equal to the crack bending moment inspection value. Here, the dynamic coefficient is 1.5. The theoretical basis is provided for hoisting piles safely and guaranteeing quality of piles.