论文部分内容阅读
一、光面碳素钢丝的使用问题我厂生产的预应力混凝土电杆和双向预应力混凝土轻型大楼板,全部使用碳素钢丝作预应力筋。光面圆截面碳素钢丝(下称光面钢丝)的机械性能如表1所示。握裹力不足,使用时,常发生回缩致使预应力损失过大。在同一电杆或楼板中,当回缩不均匀时,则会造成制品弯曲,降低力学性能。因此,生产时不得不降低钢丝的使用强度(取110～120公斤/毫米~2),而钢丝用量也相应增加25％以上。同时,还要提高混凝土的脱模强度,这又不得不延长蒸养时间,降低生产率。二、刻痕碳素钢丝的使用效果光面(碳素)钢丝经刻痕处理后即为刻痕(碳素)钢丝。刻痕钢丝具有良好的使用性能。
First, the use of smooth carbon steel wire production The prestressed concrete poles and two-way prestressed concrete lightweight building panels produced by our factory all use carbon steel wire as prestressing bars. The mechanical properties of smooth round section carbon steel wire (hereinafter referred to as smooth steel wire) are shown in Table 1. Insufficient gripping force, when used, often causes retraction causing excessive loss of prestress. In the same pole or floor, when the retraction is not uniform, it will cause the product to bend and reduce the mechanical properties. Therefore, the production intensity must be reduced (take 110 ~ 120 kg / mm ~ 2), while the amount of wire also increased by more than 25%. At the same time, it is necessary to increase the demoulding strength of the concrete, which in turn has to lengthen the steaming time and reduce the productivity. Second, the effect of the use of nicked carbon steel wire Smooth (carbon) steel wire is notched (carbon) steel wire. Scored steel wire has good performance.