最近,笔者走访了江苏、安徽两省20多个乡镇预制厂和建筑工地,发现了一些工程事故隐患,现浅谈如下: 1.张拉应力控制不严,甚至失控。大多数的预制厂都是用冷拔低炭钢丝,其张拉控制应力应为σ_k=0.7R_y~b(标准强度),每根钢筋的张拉力应为: Recently, the author visited more than 20 prefabricated factories and construction sites in Jiangsu and Anhui provinces, and discovered some engineering accident hazards. Now it is discussed as follows: 1. Tensile stress control is not strict, even out of control. Most prefabrication plants use cold-drawing low-carbon steel wire. The tension control stress should be σ_k=0.7R_y~b (standard strength). The tensile force of each steel bar should be: