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先张法预应力施工工艺在我国的应用还是比较广泛的,它的施工工序比较简单,适用于中小型构件。先张法的施工设备主要有台座、夹具和张拉机具。先张法的施工工艺流程大致可分为以下几个阶段:钢绞线的下料——穿筋——预应力筋张拉——构件制作——预应力筋放张。先张法施工工艺常见的主要问题有张拉时的滑丝和断丝、预应力筋的失效与预应力的损失等问题。文章对产生这些常见问题的原因作了分析,并提出了预防和处理措施。
Pre-tensioned prestressed construction technology in our application is still relatively wide, and its construction process is relatively simple, suitable for small and medium-sized components. The first piece of construction equipment, there are mainly bench, fixtures and tensioning equipment. The pre-tensioned construction process can be roughly divided into the following stages: strand cutting-piercing-prestressing tendon-component fabrication-prestressing tendon release. Pre-tension method of construction of the common main problems are tension when the sliding wire and broken wire, the failure of prestressed tendons and the loss of prestressed and other issues. The article analyzes the causes of these common problems and puts forward the measures for prevention and treatment.