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预应力张拉是预应力电杆生产中的一个重要工艺环节,其控制应力的取值,不仅关系到杆段的抗裂性能,而且还将影响到钢材的利用率,涉及到线路的经济性。下面想就我厂多年来的生产实际,对控制应力的取值问题提出点看法,供探讨。钢筋(钢丝)的控制应力,就是指在台座上(对于后张法构件则是指在构件的端部),张拉钢筋(钢丝)时所需要控制的最大应力值。通常,在对构件施加预应力时,选择合理控制应力的原则是,在充分发挥钢材强度的前提下,适当控制应力值,以保证质量和安全。从构件在使用阶段的抗裂性来
Prestressed tensioning is an important process link in the production of prestressed poles. The value of the control stress not only affects the crack resistance of the segment, but also affects the utilization of the steel, involving the economics of the line. . Now I would like to put forward some views on the value of control stress for the actual production of our plant over the years for discussion. The control stress of a steel bar (steel wire) refers to the maximum stress value that needs to be controlled when tensioning a steel bar (steel wire) on a pedestal (for a post-tensioned component, the end of the component). Generally, when applying prestressing force to a component, the principle of choosing reasonable stress control is to properly control the stress value under the premise of giving full play to the strength of the steel to ensure quality and safety. From the crack resistance of the component at the use stage