承压型预应力抗浮锚杆设计方法的探讨

Design methods for pressured grout prestressed anti-floating anchor

通过分析承压型预应力抗浮锚杆在施工、使用阶段的应力变化,结合相关规范要求与工程实例,对承压型预应力抗浮锚杆的设计原则、设计方法进行探讨,概括、总结了此类锚杆设计计算的相关内容:不仅需对使用阶段锚杆的极限抗拔承载力、预应力筋受拉承载力、承载体局压区承载力等进行验算,尚应对施工阶段进行校核。同时,提出了锚杆顶部开裂控制计算的相关原则与验算方法,可供设计人员参考。对承压型预应力抗浮锚杆设计中存在的配筋量与开裂控制、施工阶段荷载效应、锚固体强度的确定等问题进行了讨论,为总结、完善此类锚杆的设计提出了思路。

Through stress analysis in construction and service stages and based on the relevant interrelated codes and practical examples, the design principles and methods of pressured grout prestressed anti-floating anchor are studied. The related calculations are summarized: the bearing capacities of anchor, prestressed reinforcement and partial bearing pad in the service stage should be examined, and the bearing capacities in the construction stage are also examined. The cracking control principle and checking method at the top of anchor are put forward so as to provide references for designers. The problems about reinforcement ratio and cracking control, load effect in construction stage and strength of anchor body are discussed to summarize and improve the design of pressured grout prestressed anchor.