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长线生产冷拔低碳钢丝预应力空心板,由于材料货源广,加工工艺简单,重量轻,体积小,节约钢材,价格便宜,以及优良的结构性能等优点,在全国工业与民用建筑中得到了广泛的应用.在预应力混凝土构件中,对钢筋(钢丝)施加预应力能提高构件的抗裂性能,限制裂缝的发展,增加构件的刚度,提高构件的耐久性.在预应力空心板的施工中,预应力钢丝从张拉、锚固、混凝土浇捣、养护、构件起吊到施工安装的整个过程中,钢丝的预应力值均在不断降低,其中有的预应力损失已在设计计算中考虑过,而还有一些预应力损失是在施工中无法估计的.如:材料的质量、张拉设备、测力计的精度、台座长度、定位板刚度和安装质量、锚夹具的磨损变形、操作等,这些因素是生产质量的常见病和多发病,是影响构件质量的主要因素.应引起我们的重视,并认真分析其原因.
Long-term production of cold-drawing low-carbon steel prestressed hollow slabs, due to the wide supply of materials, the processing process is simple, light weight, small size, saving steel, cheap, and excellent structural properties, etc., in the national industrial and civil construction has been Widely used. In prestressed concrete components, prestressing the steel (steel wire) can improve the crack resistance of the components, limit the development of cracks, increase the stiffness of the components, and improve the durability of the components. Construction of prestressed hollow slabs In the whole process of tensioning, anchoring, concrete pouring, maintenance, and lifting of components from the prestressed steel wire to the construction and installation, the prestress value of the steel wire is continuously decreasing, and some of the prestress losses have been considered in the design calculation. , And some prestress loss can not be estimated in the construction. Such as: material quality, tensioning equipment, dynamometer accuracy, pedestal length, positioning plate stiffness and installation quality, anchor fixture wear deformation, operation, etc. These factors are the common and frequently occurring quality of production, and are the main factors affecting the quality of components. We should pay attention to it and carefully analyze its causes.