预制构件在钢筋混凝土强度达到设计要求、底模隔离剂有效、吊点设计位置正确、吊索与平面夹角大于60°及文明装卸等情况下,仍可能因其它一些不太为人们所注意的原因而产生裂缝,本文简单介绍一下这些原因。 1.构件吊运时与使用阶段的应力状态相反搁板、雨篷一类的悬臂小构件,蓝图上一般都没有设计吊环或吊点,如果在浇灌成型、脱模起吊、堆放、运输时不予注意,构件的应力状态往往与其在使用阶段相反,就会产生裂缝。如我单位施工的某宿舍楼搁板,只有横向负筋是受力筋,纵 Prefabricated components may still be less noticeable for others due to the reinforced concrete strength reaching the design requirements, the effectiveness of the bottom mold release agent, the correct design of the lifting point, the angle between the hanger and the plane greater than 60°, and civilized loading and unloading. Cause cracks, this article briefly describes these reasons. 1. The stress state of component lifting and use phase is opposite to cantilever small component such as shelf and awning. There is generally no design hanging ring or hanging point on the blueprint. If it is not formed during watering, demoulding, lifting, stacking or transportation, It is to be noted that the stress state of the component is often opposite to that in the use phase, and cracks will occur. If a dormitory building is built by our company, only the horizontal negative tendons are stressed bars.